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Небесная энциклопедия

Космические корабли и станции, автоматические КА и методы их проектирования, бортовые комплексы управления, системы и средства жизнеобеспечения, особенности технологии производства ракетно-космических систем

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Мониторинг СМИ

Мониторинг СМИ и социальных сетей. Сканирование интернета, новостных сайтов, специализированных контентных площадок на базе мессенджеров. Гибкие настройки фильтров и первоначальных источников.

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29-11-2012 дата публикации

Method for manufacturing grain oriented electrical steel sheets

Номер: US20120298265A1
Автор: Kenichi Sadahiro
Принадлежит: JFE Steel Corp

In a method for manufacturing grain oriented electrical steel sheets from a slab, controlling the steel sheet temperature so as to satisfy T (t)<FDT−(FDT−700)×t/6 (wherein T (t): steel sheet temperature (° C.), FDT: finishing temperature (° C.) and t: time (sec) after the completion of finish rolling) throughout the entire length of a coil during cooling after the completion of finish rolling in hot rolling, and controlling the steel sheet temperature of a tip portion of the coil representing 10% of the length of the coil to be not less than 650° C. at a lapse of 3 seconds from the completion of hot rolling, thus manufacturing a grain oriented electrical steel sheet exhibiting excellent magnetic properties throughout the entire coil length.

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Номер записи: 1
23-05-2013 дата публикации

Manufacturing method of non-oriented electrical steel sheet

Номер: US20130125601A1
Автор: Masahiro Fujikura, Takeshi Kubota
Принадлежит: Nippon Steel and Sumitomo Metal Corp

A steel having a predetermined composition is hot-rolled so as to form a steel strip, the steel strip is subjected to first cold-rolling, the steel strip is subjected to intermediate annealing, the steel strip is subjected to second cold-rolling, and the steel strip is subjected to finish annealing. A finish temperature in the hot-rolling is 900° C. or less, annealing is not performed between the hot-rolling and the first cold-rolling, and a rolling reduction in the second cold-rolling is not less than 40% nor more than 85%.

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Номер записи: 2
10-10-2013 дата публикации

Method of producing non-oriented electrical steel sheet

Номер: US20130263981A1
Автор: Hiroaki Toda, Yoshiaki Zaizen, Yoshihiko Oda
Принадлежит: JFE Steel Corp

A non-oriented electrical steel sheet having a high magnetic flux density in a rolling direction of the steel sheet is produced by hot rolling a raw steel material including C: not more than 0.03 mass %, Si: not more than 4 mass %, Mn: 0.03˜3 mass %, Al: not more than 3 mass %, S: not more than 0.005 mass %, N: not more than 0.005 mass % and the balance being Fe and inevitable impurities, and then cold rolling and finishing annealing to produce a non-oriented electrical steel sheet, characterized in that a crystal grain size before the cold rolling is rendered into not more than 100 μM and the finishing annealing is conducted by rapidly heating up to a temperature exceeding recrystallization temperature at an average temperature rising rate of not less than 100° C./sec.

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Номер записи: 3
01-01-2015 дата публикации

Non-Oriented Electrical Steel Sheet and Method of Manufacturing the Same

Номер: US20150000793A1
Автор: Bae Byung-Keun, Kim Yong-Soo, Park Junesoo, Sin Su-Yong
Принадлежит:

Disclosed are a non-oriented electrical steel sheet and a method of manufacturing the same. The non-oriented electrical steel sheet of the present invention includes 0.005 wt % or less of C, 1.0-4.0 wt % of Si, 0.1-0.8 wt % of Al, 0.01-0.1 wt % of Mn, 0.02-0.3 wt % of P, 0.005 wt % or less of N. 0.001-0.005 wt % of S, 0.005 wt % or less of Ti, 0.01-0.2 wt % of at least one of Sn and Sb, and the remainder including Fe and other impurities unavoidably added thereto, wherein Mn, Al, P, and S may respectively fulfill the empirical formula 0.8≦{[Mn]/(100*[S])+[Al]}/[P]≦40, wherein [Mn], [Al], [P], and [S] respectively refer to weight percentages of Mn, Al, P, and S. 110-. (canceled)11. A non-oriented electrical steel sheet of the present invention includes 0.005 wt % or less of C , 1.0-4.0 wt % of Si , 0.1-0.8 wt % of Al , 0.01-0.1 wt % of Mn , 0.02-0.3 wt % of P , 0.005 wt % or less of N , 0.001-0.005 wt % of S , 0.005 wt % or less of Ti , 0.01-0.2 wt % of at least one of Sn and Sb , and the remainder including Fe and other impurities unavoidably added thereto , {'br': None, '0.8≦{[Mn]/(100*[S])+[Al]}/[P]≦40,'}, 'wherein Mn, Al, P, and S may respectively fulfill the empirical formula belowwherein [Mn], [Al], [F], and [S] respectively refer to weight percentages of Mn, Al, P, and S.12. The non-oriented electrical steel sheet of claim 11 , whereinMn is contained in an amount of 0.01-0.05 wt % therein.13. The non-oriented electrical steel sheet of claim 11 , wherein Al is contained in the amount of 0.3-0.8 wt % therein claim 11 , and [Mn]<[P] claim 11 , wherein [Mn] and [P] respectively refer to weight percentages of Mn and P.14. The non-oriented electrical steel sheet of claim 12 , wherein Al is contained in the amount of 0.3-0.8 wt % therein claim 12 , and [Mn]<[P] claim 12 , wherein [Mn] and [P] respectively refer to weight percentages of Mn and P.15. The non-oriented electrical steel sheet of claim 13 , wherein the impurities unavoidably added may include at least one ...

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Номер записи: 4
01-01-2015 дата публикации

Non-Oriented Silicon Steel and Its Manufacturing Method

Номер: US20150000794A1
Автор: Hei Hongxu, Liu Xiandong, Ma Aihua, Wang Bo, Xie Shishu, Zou Liang
Принадлежит: BAOSHAN IRON & STEEL CO., LTD.

An unoriented silicon steel having high magnetic conductivity and low iron loss at a working magnetic density of 1.0-1.5 T and method for manufacturing same. By proper deoxidation control in a RH refining and high-temperature treatment for a short time in a normalizing step, the method can reduce the amount of inclusions in the silicon steel and improve grain shape, so as to improve the magnetic conductivity and iron loss of the unoriented silicon steel at a magnetic density of 1.0-1.5 T. 1. A method for producing a non-oriented silicon steel , comprising the following steps in sequence: a) steel making , b) hot rolling , c) normalizing , d) cold rolling , and e) annealing , wherein ,said steel making step a) is used for obtaining a casting slab having the following components by weight: C≦0.005%, 0.1%≦Si≦2.5%, Al≦1.5%, 0.10%≦Mn≦2.0%, P≦0.2%, S≦0.005%, N≦0.005%, Nb+V+Ti≦0.006%, and the balance being Fe and inevitable impurities;{'b': '50', 'said steel making step a) includes RH refining, wherein decarbonization treatment and deoxidation treatment are proceeded in RH refining; the input amount of the deoxidizer Y satisfies the following formula: Y=K×m×([O]−),'}{'sup': −3', '−3, 'wherein [O] represents the content of free oxygen in unit of ppm upon the completion of decarbonization; K represents a coefficient indicating deoxidation capacity of the deoxidizer, and is in the range from 0.35×10to 1.75×01; m represents the weight of molten steel contained in the steel ladle, in the unit of ton; and'}{'sub': '1', 'in said normalizing step c), the hot-rolled steel strip after hot rolling is heated to a temperature of phase transformation point temperature Acor above and 1,100° C. or below and is held for a time period t of 10˜90 s.'}2. The method for producing a non-oriented silicon steel according to claim 1 , wherein said casting slab further contains Sn and/or Sb claim 1 , wherein the content of Sn is 0.1 wt % or less claim 1 , and the content of Sb is 0.1 wt % or less.3 ...

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Номер записи: 5
06-01-2022 дата публикации

METHOD FOR MANUFACTURING GRAIN-ORIENTED ELECTRICAL STEEL SHEET AND GRAIN-ORIENTED ELECTRICAL STEEL SHEET

Номер: US20220002831A1
Автор: ATSUMI Haruhiko, Kataoka Takashi, MIZUKAMI Kazumi, Morishige Nobusato, Suwa Yoshihiro, TANAKA Ichiro, YAMAGATA Ryutaro
Принадлежит: NIPPON STEEL CORPORATION

Grain-oriented electrical steel sheet excellent in coating adhesion and magnetic properties is provided. The method for manufacturing grain-oriented electrical steel sheet excellent in coating adhesion and magnetic properties includes a process of heating to 1280° C. or more and hot rolling a slab containing, by mass %, Bi and a predetermined composition of constituents and having a balance of Fe and impurities so as to obtain hot rolled steel sheet, a process, after hot rolling annealing the hot rolled steel sheet, of cold rolling it one time or cold rolling it two times or more with process annealing performed interposed so as to obtain cold rolled steel sheet, a process of rapidly heating then decarburization annealing the steel sheet, a process of coating the surface of the cold rolled steel sheet after decarburization annealing with an annealing separator containing predetermined compounds including sulfates or sulfides and having MgO as its main constituent, then performing finish annealing, a process of performing strictly controlled finish annealing, and a process of coating an insulating coating, then performing flattening annealing. 2. Grain-oriented electrical steel sheet comprising a base metal steel sheet containing , by mass % , C: 0.005% or less , Si: 2.5 to 4.5% , and Mn: 0.01 to 0.15% and having a balance of Fe and impurities and a primary coating formed on a surface of the base metal steel sheet and containing MgSiOas its main constituent , in which grain-oriented electrical steel sheet ,{'sub': 'Al', 'a peak position Dof Al emission intensity obtained when analyzing the elements by glow discharge optical emission spectrometry from a surface of the primary coating in a thickness direction of the grain-oriented electrical steel sheet is present in a range from the surface of the primary coating to 2.0 to 12.0 μm in the thickness direction,'}{'sup': '2', 'a number density ND of the Al oxides is 0.02 to 0.20/μm,'}{'sub': 'S', 'a peak position Dof S ...

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Номер записи: 6
04-01-2018 дата публикации

Non-oriented electrical steel sheet and method for manufacturing thereof

Номер: US20180002776A1
Автор: Ichiro Tanaka, Satoshi Kano, Takeaki Wakisaka
Принадлежит: Nippon Steel and Sumitomo Metal Corp

A non-oriented electrical steel sheet includes C: 0 to 0.0050 mass %, Si: 0.50 to 2.70 mass %, Mn: 0.10 to 3.00 mass %, Al: 1.00 to 2.70 mass %, and P: 0.050 to 0.100 mass %. In the non-oriented electrical steel sheet, Al/(Si+Al+0.5×Mn) is 0.50 to 0.83, Si+Al/2+Mn/4+5×P is 1.28 to 3.90, Si+Al+0.5×Mn is 4.0 to 7.0, the ratio of the intensity of {100} plane I{100} to the intensity of {111} plane I{111} is 0.50 to 1.40, the specific resistance is 60.0×10 −8 Ω·m or higher at room temperature, and the thickness is 0.05 mm to 0.40 mm.

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Номер записи: 7
11-01-2018 дата публикации

Grain-oriented electrical steel plate and production method therefor

Номер: US20180010206A1
Автор: Hyun-Chul Park, Jae-Kyoum KIM, Jong-Tae Park, Jung Hun PARK, Oh-Yeoul Kwon, Se Min Park, Seong-Kyu SEE, Seung Gon LEE, Sung-Yeun WON
Принадлежит: Posco Co Ltd

Provided is an oriented electrical steel sheet including a groove existing on the surface of the electrical steel sheet and a forsterite layer formed on a part or all of the surface of the electrical steel sheet, in which forsterite which is extended from the forsterite layer and penetrates to a base steel sheet in an anchor form is present on the surface of the side of the groove.

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Номер записи: 8
15-01-2015 дата публикации

Non-Oriented Silicon Steel and Manufacturing Process Thereof

Номер: US20150013844A1
Автор: Aihua Ma, BO Wang, Feng Zhang, Hongxu Hei, Huawei Zhang, Junliang LIU, Liang ZOU, Shishu Xie, Wei Cao, Xiandong Liu, Xiao Chen
Принадлежит: Baoshan Iron and Steel Co Ltd

The present invention provides a non-oriented silicon steel with excellent magnetic properties and a manufacturing process therefor. During the manufacturing process of the present invention, the temperature T of the molten steel of steel tapped from a converter during steelmaking and the carbon content [C] and the free oxygen content [O] comply with the following formula: 7.27×10 3 ≦[O][C]e (−5000/T) ≦2.99×10 4 , and the final annealing step uses tension annealing at a low temperature for a short time. A non-oriented silicon steel with a low iron loss, and excellent anisotropy of iron loss can be obtained by means of the manufacturing process of the present invention.

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Номер записи: 9
15-01-2015 дата публикации

Method for Producing Silicon Steel Normalizing Substrate

Номер: US20150013846A1
Автор: Chen Xiao, Hei Hongxu, Jiang Rongqiang, Lin Runjie, Liu Xiandong, Su Dejun, Xie Shishu, Ye Miao, Zhang Peili
Принадлежит: BAOSHAN IRON & STEEL CO., LTD.

A method for producing a silicon steel normalizing substrate comprises steelmaking, hot rolling and normalizing steps. A normalizing furnace is used in the normalizing step, and along a moving direction of strip steel, the normalizing furnace sequentially comprises: a preheating section, a nonoxidizing heating section, a furnace throat, furnace sections for subsequent normalizing processing, and a delivery seal chamber. Furnace pressures of the normalizing furnace are distributed as follows: the furnace pressure of a downstream furnace section adjacent to the furnace throat along the moving direction of the strip steel is the highest, the furnace pressure decreases gradually from the furnace section with the highest furnace pressure to a furnace section in an inlet direction of the normalizing furnace, and the furnace pressure decreases gradually from the furnace section with the highest furnace pressure to a furnace section in an outlet direction of the normalizing furnace. 1. A method for producing normalized silicon steel substrates , comprising steps of steelmaking , hot rolling , and normalizing , wherein a normalizing furnace is used in the normalizing step and comprises sequentially , along the running direction of the strip steel , preheating section , non-oxidation heating section , tunnel seal , multiple subsequent normalizing treatment furnace sections , and exit sealing device , wherein the normalizing furnace has a pressure distribution as follows: the furnace pressure reaches its maximum at the downstream furnace section adjacent to the tunnel seal along the running direction of the strip steel , said furnace pressure gradually declines from the furnace section having the maximum pressure to the furnace sections toward the inlet of the normalizing furnace , and gradually declines from the furnace section having the maximum pressure to the furnace sections toward the outlet of the normalizing furnace.2. The method of claim 1 , wherein said multiple ...

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Номер записи: 10
15-01-2015 дата публикации

Method for Producing Silicon Steel Normalizing Substrate

Номер: US20150013847A1
Автор: Hei Hongxu, Li Xiaolin, Liu Xiandong, Ma Aihua, Wang Bo, Xie Shishu, Yang Guohua, Yang Yongjie, Zhang Huawei, Zou Liang
Принадлежит: BAOSHAN IRON & STEEL CO., LTD.

A method for producing a silicon steel normalizing substrate comprises: steelmaking, hot rolling and normalizing steps. The normalizing step uses a normalizing furnace having a nonoxidizing heating furnace section. The nonoxidizing heating furnace section comprises more than 3 furnace zones. An energy investment ratio of the furnace zones used in the nonoxidizing heating furnace section is adjusted, so as to control an excess coefficient α of the nonoxidizing heating furnace section to be within a range of 0.8≦α<1.0. 1. A method for producing normalized silicon steel substrates , comprising steps of steelmaking , hot rolling , and normalizing , wherein a normalizing furnace comprising an non-oxidation heating furnace section is used in the normalizing step , and the non-oxidation heating furnace section comprises three or more furnace zones , wherein an energy input rate of the furnace zones that are put into use in said non-oxidation heating furnace section is adjusted so that an excess coefficient α of said non-oxidation heating furnace section is controlled within the range of 0.8≦α<1.0 , andwherein the energy input rate is the ratio of the actual combustion load power of nozzles put into use in a furnace zone to the full load power of nozzles put into use in said furnace zone, and the excess coefficient is the ratio of the air amount for actual combustion to the air amount for theoretical combustion.2. The method of claim 1 , wherein the energy input rate of furnace zones that are put into use in said non-oxidation heating furnace section is adjusted to be within the range of 15%˜95%.3. The method of claim 1 , wherein the energy input rate of said furnace zones put into use is adjusted by closing at least one furnace zone of said non-oxidation heating furnace section.4. The method of claim 1 , wherein the energy input rate of said furnace zones put into use is adjusted by adjusting the number of nozzles to be used in the furnace zones put into use in said non- ...

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Номер записи: 11
15-01-2015 дата публикации

HOT-ROLLED STEEL SHEET FOR GENERATOR RIM AND METHOD FOR MANUFACTURING THE SAME

Номер: US20150013853A1
Автор: Funakawa Yoshimasa, Nakajime Katsumi, Nakamura Nobuyuki, Ogura Takahiko, Okimoto Kazutaka
Принадлежит: JFE STEEL CORPORATION

A hot-rolled steel sheet for a generator rim contains a structure containing a ferrite phase with an areal ratio of 95% or more in which precipitates containing Ti and V whose average grain diameter is less than 10 nm are precipitated in crystal grains of the ferrite phase. The ferrite phase has an average crystal grain diameter within the range of 2 μm or more and less than 10 μm. The hot-rolled steel sheet for a generator rim has strength with a yield strength YS in a rolling direction of 700 MPa or more and electromagnetic properties with a magnetic flux density Bof 1.5 T or more and a magnetic flux density Bof 1.6 T or more. 1. A hot-rolled steel sheet for a generator rim , the hot-rolled steel sheet comprising:a structure comprising a ferrite phase having an areal ratio of 95% or more in which precipitates containing Ti and V whose average grain diameter is less than 10 nm are precipitated in crystal grains of the ferrite phase, whereinthe ferrite phase has an average crystal grain diameter within a range of 2 μm or more and less than 10 μm, and{'sub': 50', '100, 'the hot-rolled steel sheet has strength with a yield strength YS in a rolling direction of 700 MPa or more and electromagnetic properties with a magnetic flux density Bof 1.5 T or more and a magnetic flux density Bof 1.6 T or more.'}2. The hot-rolled steel sheet for a generator rim according to claim 1 , wherein the structure comprises a ferrite phase with an areal ratio of 95% or more in which precipitates further containing one or two of Nb and Mo in addition to Ti and V whose average grain diameter is less than 10 nm are precipitated in crystal grains of the ferrite phase.3. The hot-rolled steel sheet for a generator rim according to claim 1 , further comprising claim 1 , in addition to the structure claim 1 , a composition comprising: in terms of percent by mass claim 1 , C: 0.03% or more and 0.11% or less claim 1 , Si: 0.3% or less claim 1 , Mn: 1.0% or more and 2.0% or less claim 1 , P: 0.06% or ...

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Номер записи: 12
14-01-2016 дата публикации

Method for producing grain-oriented electrical steel sheet (as amended)

Номер: US20160012948A1
Автор: Masanori Uesaka, Minoru Takashima, Takeshi Imamura
Принадлежит: JFE Steel Corp

In a method for producing a grain-oriented electrical steel sheet by hot rolling a steel slab comprising C: 0.04-0.12 mass %, Si: 1.5-5.0 mass %, Mn: 0.01-1.0 mass %, sol. Al: 0.010-0.040 mass %, N: 0.004-0.02 mass %, one or two of S and Se: 0.005-0.05 mass % in total of S and Se, cold rolling, and subjecting to primary recrystallization annealing and further to final annealing, a content ratio of sol. Al to N in the steel slab (sol. Al/N) and a final thickness d (mm) satisfy an equation of 4d+1.52≦sol. Al/N≦4d+2.32, and the steel sheet in the heating process of the final annealing is held at a temperature of 775-875° C. for 40-200 hours and then heated in a temperature region of 875-1050° C. at a heating rate of 10-60° C./hr to preform secondary recrystallization and purification treatment, whereby an extremely-thin grain-oriented electrical steel sheet having a low iron loss and a small deviation in coil is produced.

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Номер записи: 13
14-01-2016 дата публикации

METHOD FOR PRODUCING GRAIN-ORIENTED ELECTRICAL STEEL SHEET (AS AMENDED)

Номер: US20160012949A1
Автор: FUKUNAGA Takayuki, Imamura Takeshi, Suehiro Ryuichi, Takamiya Toshito, UESAKA Masanori
Принадлежит: JFE STEEL CORPORATION

In a method for producing a grain-oriented electrical steel sheet by hot rolling a raw steel material containing C: 0.002˜0.10 mass %, Si: 2.0˜8.0 mass % and Mn: 0.005˜1.0 mass % to obtain a hot rolled sheet, subjecting the hot rolled sheet to a hot band annealing as required and further to one cold rolling or two or more cold rollings including an intermediate annealing therebetween to obtain a cold rolled sheet having a final sheet thickness, subjecting the cold rolled sheet to a primary recrystallization annealing combined with decarburization annealing, applying an annealing separator to the steel sheet surface and then subjecting to a final annealing, when rapid heating is performed at a rate of not less than 50° C./s in a range of 100˜700° C. in the heating process of the primary recrystallization annealing, the steel sheet is subjected to a holding treatment at any temperature of 250˜600° C. for 0.5˜10 seconds 2 to 6 times to thereby obtain a grain-oriented electrical steel sheet being low in the iron loss and small in the deviation of the iron loss value. 1. A method for producing a grain-oriented electrical steel sheet by hot rolling a raw steel material containing C: 0.002˜0.10 mass % , Si: 2.0˜8.0 mass % and Mn: 0.005˜1.0 mass % to obtain a hot rolled sheet , subjecting the hot rolled sheet to a hot band annealing as required and further to one cold rolling or two or more cold rollings including an intermediate annealing therebetween to obtain a cold rolled sheet having a final sheet thickness , subjecting the cold rolled sheet to a primary recrystallization annealing combined with decarburization annealing , applying an annealing separator to the steel sheet surface and then subjecting to a final annealing , characterized in that when rapid heating is performed at a rate of not less than 50° C./s in a range of 100˜700° C. in the heating process of the primary recrystallization annealing , the steel sheet is subjected to a holding treatment at any ...

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Номер записи: 14
03-02-2022 дата публикации

HOT-BAND ANNEALING EQUIPMENT, HOT-BAND ANNEALING METHOD AND DESCALING METHOD FOR SI-CONTAINING HOT ROLLED STEEL SHEET

Номер: US20220033928A1
Автор: Harada Yoshimitsu, MATSUBARA Yukihiro, Takatsu Takahiro, Tamura Yuta, Yamada Goki
Принадлежит: JFE STEEL CORPORATION

Provided is a hot-band annealing method comprising subjecting a Si-containing hot rolled steel sheet, having an oxidized scale formed on a surface of the steel sheet by hot rolling, to hot-band annealing with a hot-band annealing equipment provided with a heating zone, a soaking zone, a cooling zone, and a rapid heating device at an upstream side of the heating zone and/or in an inlet side of the heating zone, wherein the hot rolled steel sheet is heated by not lower than 50° C. at a heating rate of not less than 15° C./s by using the rapid heating device to improve a descaling property. Also, provided is a descaling method characterized by subjecting the Si-containing hot rolled steel sheet, after the hot-band annealing, to descaling only by pickling without requiring mechanical descaling or heating the steel sheet in the pickling process. 1. A hot-band annealing method comprising: (i) a rapid heating device is disposed at an upper stream side of the heating zone and/or an inlet side of the heating zone, and', '(ii) a start temperature for heating the Si-containing hot-rolled steel sheet in the rapid heating device is in a range of room temperature to 700° C. and the Si-containing hot rolled steel sheet is heated by not lower than 50° C. at a heating rate of not less than 15° C./s by using the rapid heating device., 'subjecting a Si-containing hot rolled steel sheet, having an oxidized scale formed on a surface of the steel sheet by hot rolling, to hot-band annealing with a hot-band annealing equipment provided with a heating zone, a soaking zone and a cooling zone, characterized in that'}2. The hot-band annealing method according to claim 1 , wherein the rapid heating device is an induction heating device or an electric heating device.3. A descaling method claim 1 , characterized by subjecting the Si-containing hot rolled steel sheet claim 1 , after the hot-band annealing by the method according to claim 1 , to pickling without conducting mechanical descaling.4. A ...

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Номер записи: 15
17-01-2019 дата публикации

Non-oriented electrical steel sheet and manufacturing method therefor

Номер: US20190017136A1
Автор: Se Il Lee
Принадлежит: Posco Co Ltd

A non-oriented electrical steel sheet according to one embodiment of the present invention comprises, by weight, 1.0% to 4.0% of Si, 0.001% to 0.01% of Al, 0.002%⋅to 0.009% of S, 0.01% to 0.3% of Mn, 0.001% to 0.004% of N, 0.004% or less (0% exclusive) of C, 0.003% or less (0% exclusive) of Ti, 0.005% to 0.07% of Cu, 0.05% to 0.2% of either or both of Sn and P, and a balance amount of Fe and impurities.

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Номер записи: 16
17-01-2019 дата публикации

NON-ORIENTED ELECTRICAL STEEL SHEET AND MANUFACTURING METHOD THEREFOR

Номер: US20190017137A1
Автор: BAE Byung Keun, Kim Yong Soo
Принадлежит: POSCO

A non-oriented electrical steel sheet according to one embodiment of the present disclosure comprises 0.005 wt % or less of C (excluding 0 wt %), 1.0-4.0 wt % of Si, 0.15-1.5 wt % of Al, 0.1-1.0 wt % of Mn, 0.2 wt % or less of P (excluding 0 wt %), 0.005 wt % or less of N (excluding 0 wt %), 0.001-0.006 wt % of S, 0.005 wt % or less of Ti (excluding 0 wt %), and 0.005 wt % or less of O (excluding 0 wt %), and the remainder being Fe and other inevitable impurities, and satisfies formula 1 below, wherein a mean size of oxides in the precipitates is larger than a mean size of non-oxides. 2. The non-oriented electrical steel sheet of claim 1 , whereina number of oxides in the precipitates is larger than that of non-oxides.3. The non-oriented electrical steel sheet of claim 1 ,further comprising 0.01 to 0.2 wt % of Sn and Sb, individually or in combination, respectively.4. The non-oriented electrical steel sheet of claim 1 ,wherein a number of FeO in the precipitates or precipitates containing FeO is 40% or more.5. The non-oriented electrical steel sheet of claim 1 ,wherein a mean particle size is 50 to 180 μm.7. The method of claim 6 , whereinwherein the slab further comprises 0.01 to 0.2 wt % of Sn and Sb, individually or in combination.8. The method of claim 6 , whereinthe step of preparing the hot rolled sheet comprises heating the slab at 1200° C. or lower.9. The method of claim 6 , whereina temperature of the winding is 600 to 800° C. in the step of winding and then cooling the hot rolled sheet.10. The method of claim 6 , whereina temperature of the hot rolled sheet annealing is 850 to 1150° C. in the step of annealing and then cooling the hot rolled sheet.11. The method of claim 6 , whereinwherein the step of cold rolling the hot rolled annealing sheet to prepare a cold rolled sheet comprises cold rolling to a thickness of 0.1 to 0.7 mm.12. The method of claim 6 , whereinthe step of cold rolling the hot rolled annealing sheet to prepare a cold rolled sheet ...

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Номер записи: 17
18-01-2018 дата публикации

MANUFACTURING METHOD FOR GRAIN-ORIENTED ELECTRICAL STEEL SHEET

Номер: US20180017868A1
Автор: Suehiro Ryuichi, TERASHIMA Takashi
Принадлежит: JFE STEEL CORPORATION

Provided is a manufacturing method for a grain-oriented electrical steel sheet with which it is possible to achieve both good iron loss and high productivity. In groove formation for magnetic domain refinement, a resist containing a photosensitive resin is applied, photoexposed, and developed to form an exposed steel substrate portion having a linear shape. Subsequently, electrolytic etching is performed at current density ρ=I/S of 7.5 A/cmor more with respect to the exposed steel substrate portion, where I represents current supplied to an electrode and S represents surface area of the exposed steel substrate portion in a steel sheet surface of equal surface area to the electrode. 1. A manufacturing method for a grain-oriented electrical steel sheet , comprising:hot rolling a material for a grain-oriented electrical steel sheet to obtain a hot rolled steel sheet;cold rolling the hot rolled steel sheet once, or twice or more with intermediate annealing, to obtain a cold rolled steel sheet of final sheet thickness;forming an exposed steel substrate portion having a continuous or discontinuous linear shape in a sheet transverse direction by applying a resist film containing a photosensitive resin onto at least one surface of the cold rolled steel sheet, patterning the resist film through localized photoexposure of the surface at which the resist film is applied, and developing the resist film;subjecting a steel sheet obtained after formation of the exposed steel substrate portion to electrolytic etching to form a groove having a continuous or discontinuous linear shape in the sheet transverse direction; andsubjecting the steel sheet resulting from the electrolytic etching to primary recrystallization annealing and subsequent final annealing, wherein{'sup': '2', 'the electrolytic etching is performed at current density ρ of 7.5 A/cmor more with respect to the exposed steel substrate portion, the current density ρ being defined as ρ=I/S, where I represents current ...

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Номер записи: 18
21-01-2016 дата публикации

Method for producing grain-oriented electrical steel sheet

Номер: US20160020006A1
Автор: Makoto Watanabe, Ryuichi Suehiro, Takeshi Imamura, Toshito Takamiya
Принадлежит: JFE Steel Corp

In a method for producing a grain-oriented electrical steel sheet by comprising a series of steps of hot rolling a raw steel material comprising C: 0.002-0.10 mass %, Si: 2.0-8.0 mass %, and Mn: 0.005-1.0 mass %, subjecting the steel sheet to a hot band annealing as required, cold rolling to obtain a cold rolled sheet having a final sheet thickness, subjecting the steel sheet to primary recrystallization annealing combined with decarburization annealing, applying an annealing separator to the steel sheet surface and then subjecting to final annealing, rapid heating is performed at a rate of not less than 50° C./s in a region of 200-700° C. in the heating process of the primary recrystallization annealing, and the steel sheet is held at any temperature of 250-600° C. in the above region for 1-10 seconds, while a soaking process of the primary recrystallization annealing is controlled to a temperature range of 750-900° C., a time of 90-180 seconds and P H2O /P H2 in an atmosphere of 0.25-0.40, whereby a grain-oriented electrical steel sheet being low in the iron loss and small in the deviation of the iron loss value is obtained.

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Номер записи: 19
10-02-2022 дата публикации

ORIENTED ELECTRICAL STEEL SHEET AND MANUFACTURING METHOD THEREOF

Номер: US20220042135A1
Автор: Han Kyu-Seok, Kim Jae, Kim Seung Il, Koo Joo Young, Park Chang Soo, Yu Seon Young
Принадлежит:

An oriented electrical steel sheet according to an exemplary embodiment of the present invention includes C: 0.01% or less (excluding 0%), Si: 2.0%-4.0%, Mn: 0.01%-0.20%, acid soluble Al: 0.040% or less (excluding 0%), N: 0.008% (excluding 0%), S: 0.008% (excluding 0%), Se: 0.0001-0.008%, Cu: 0.002-0.1%, Ni: 0.005-0.1%, Cr: 0.005-0.1%, P: 0.005%-0.1% and Sn: 0.005%-0.20%, one or more among Sb: 0.0005%-0.10%, Ge: 0.0005%-0.10%, As: 0.0005%-0.10%, Pb: 0.0001%-0.10%, Bi: 0.0001%-0.10% and Mo: 0.001-0.1% as wt %, and consisting of the balance of Fe and other inevitable impurities, and after final secondary recrystallization, a magnetic flux density B8 is 1.92 Tesla or more. 1. An oriented electrical steel sheet comprising C: 0.01% or less (excluding 0%) , Si: 2.0%-4.0% , Mn: 0.01%-0.20% , acid soluble Al: 0.040% or less (excluding 0%) , N: 0.008% (excluding 0%) , S: 0.008% (excluding 0%) , Se: 0.0001-0.008% , Cu: 0.002-0.1% , Ni: 0.005-0.1% , Cr: 0.005-0.1% , P: 0.005%-0.1% and Sn: 0.005%-0.20% , one or more among Sb: 0.0005%-0.10% , Ge: 0.0005%-0.10% , As: 0.0005%-0.10% , Pb: 0.0001%-0.10% , Bi: 0.0001%-0.10% and Mo:0.001-0.1% as wt % , and consisting of the balance of Fe and other inevitable impurities , andafter final secondary recrystallization, a magnetic flux density B8 is 1.92 Tesla or more.2. The oriented electrical steel sheet of claim 1 , wherein{'sup': 2', '2', '1/2, 'an orientation difference (α+β)with an exact {110}<001> Goss texture for a secondary recrystallization grain after the final secondary recrystallization is 4° or less.'}3. A manufacturing method of an oriented electrical steel sheet claim 1 , comprising:preparing a slab including C: 0.01% or less (excluding 0%), Si: 2.0%-4.0%, Mn: 0.01%-0.20%, acid soluble Al: 0.040% or less (excluding 0%), N: 0.008% (excluding 0%), S: 0.008% (excluding 0%), Se: 0.0001-0.008%, Cu: 0.002-0.1%, Ni: 0.005-0.1%, Cr: 0.005-0.1%, P: 0.005%-0.1% and Sn: 0.005%-0.20%, one or more among Sb: 0.0005%-0.10%, Ge: 0.0005%-0. ...

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Номер записи: 20
10-02-2022 дата публикации

METHOD FOR PRODUCING GRAIN-ORIENTED ELECTRICAL STEEL SHEET

Номер: US20220042137A1
Автор: EHASHI Yuiko, Shingaki Yukihiro, Sugihara Hirokazu, Yoshimoto Soshi
Принадлежит: JFE STEEL CORPORATION

When a grain-oriented electrical steel sheet is produced by heating a steel slab containing, by mass %, C: 0.020 to 0.10%, Si: 2.0 to 4.0%, Mn: 0.005 to 0.50%, Al: less than 0.010%, N, S and Se: less than 0.0050% each to a temperature of not higher than 1280° C., subjecting slab to hot rolling, hot-band annealing, single cold rolling or two or more cold rollings having intermediate annealing between each cold rolling and a primary recrystallization annealing combined with decarburization annealing, applying annealing separator onto steel sheet surface, and subjecting steel sheet to finish annealing and a flattening annealing, a rapid cooling is conducted at an average cooling rate of not less than 200° C./s from 800° C. to 300° C. in cooling process from maximum achieving temperature in at least one of hot band annealing and intermediate annealing, whereby grain-oriented electrical steel sheet having excellent magnetic properties is stably produced. 1. A method for producing a grain-oriented electrical steel sheet comprising a series of stepsheating a steel slab having a component composition comprising C: 0.020 to 0.10 mass %, Si: 2.0 to 4.0 mass %, Mn: 0.005 to 0.50 mass %, Al: less than 0.010 mass %, N, S and Se: less than 0.0050 mass % each, and the remainder being Fe and inevitable impurities to a temperature of not higher than 1280° C.,hot rolling the slab to form a hot-rolled sheet,subjecting the hot-rolled sheet to a hot-band annealing, and then a single cold rolling or two or more cold rollings having an intermediate annealing between each cold rolling to form a cold-rolled sheet having a final sheet thickness,subjecting the cold-rolled sheet to a primary recrystallization annealing combined with a decarburization annealing,applying an annealing separator onto a surface of the steel sheet, andsubjecting the steel sheet to a finish annealing and a flattening annealing, whereina rapid cooling is conducted at an average cooling rate of not less than 200° C./s ...

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Номер записи: 21
24-01-2019 дата публикации

Grain-oriented electrical steel sheet and manufacturing method therefor

Номер: US20190024202A1
Автор: Hyung Don Joo, Hyung Ki Park, Jin Wook Seo, Sang Woo Lee
Принадлежит: Posco Co Ltd

An oriented electrical steel sheet according to an exemplary embodiment of the present invention includes Si: 2.0 to 7.0%, C: 0.005% or less (excluding 0%), Al: 0.05% or less (excluding 0%), N: 0.005% or less (excluding 0%), S: 0.005% or less (excluding 0%), a content of each of Ba and Y or a sum thereof: 0.001 to 0.3%, and Fe and other unavoidable impurities as a balance by wt %.

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Номер записи: 22
29-01-2015 дата публикации

METHOD OF PRODUCING ELECTRICAL STEEL SHEET

Номер: US20150027590A1
Автор: Nakanishi Tadashi, Oda Yoshihiko, Toda Hiroaki, Zaizen Yoshiaki
Принадлежит:

A method produces a high strength electrical steel sheet in which a cumulative rolling reduction ratio in rough rolling is 73.0% or more, in which in a hot band annealing step, an annealing condition is selected that satisfies an area ratio of recrystallized grains after hot band annealing of 100%, and a recrystallized grain size of 80 μm to 300 μm, under a condition where annealing temperature is 850° C. to 1000° C., and annealing duration is 10 seconds to 10 minutes, and in which in a final annealing step, an annealing condition is selected that satisfies an area ratio of recrystallized grains after the final annealing of 30% to 95%, and a length in the rolling direction of a connected non-recrystallized grain group of 2.5 mm or less, under a condition where annealing temperature is 670° C. to 800° C., and annealing duration is 2 seconds to 1 minute. 14.-. (canceled)5. A method of producing an electrical steel sheet comprising: C: 0.0050% or less,', 'Si: more than 3.5% and 5.0% or less,', 'Mn: 0.10% or less,', 'Al: 0.0020% or less,', 'P: 0.030% or less,', 'N: 0.0040% or less,', 'S: 0.0005% or more and 0.0030% or less, and', 'Ca: 0.0015% or more, and further', Sn: 0.01% or more and 0.1% or less, and', 'Sb: 0.01% or more and 0.1% or less, and, 'at least one element selected from'}, 'balance including Fe and incidental impurities;, 'heating a slab having a chemical composition including by mass%'}subjecting the slab to hot rolling consisting of rough rolling and finish rolling to obtain a hot rolled steel sheet;subjecting the steel sheet to subsequent hot band annealing and pickling;subjecting the steel sheet to a single cold rolling to have a final sheet thickness; andsubjecting the steel sheet to final annealing to produce an electrical steel sheet, 1) a cumulative rolling reduction ratio in the rough rolling is 73.0% or more,', '2) in the hot band annealing, an annealing condition is selected that satisfies an area ratio of recrystallized grains in a cross section ...

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Номер записи: 23
17-02-2022 дата публикации

Non-oriented electrical steel sheet

Номер: US20220049323A1
Автор: Takaaki Tanaka, Tomoyuki Okubo, Yoshiaki Zaizen, Yoshihiko Oda, Yukino Miyamoto
Принадлежит: JFE Steel Corp

Proposed is a non-oriented electrical steel sheet being low in iron loss and excellent in tensile strength and fatigue strength, which has a chemical composition comprising C: not more than 0.005 mass %, Si: 3 to 5 mass %, Mn: not more than 5 mass %, P: not more than 0.1 mass %, S: not more than 0.01 mass %, Al: not more than 3 mass %, N: not more than 0.005 mass %, Zn: 0.0005 mass % to 0.003 mass %, and the remainder being Fe and inevitable impurities, an average crystal grain size being not more than 40 μm, the number of the inclusions having a diameter of not less than 5 μm being not more than 5/mm 2 , a tensile strength being not less than 600 MPa, and the fatigue strength being not less than 450 MPa.

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Номер записи: 24
30-01-2020 дата публикации

METHOD FOR PRODUCING GRAIN-ORIENTED ELECTRICAL STEEL SHEET

Номер: US20200032363A1
Автор: JOO Hyung Don, KO Kyung Jun, Lee Sang Woo, YANG IL Nam
Принадлежит:

A method for producing a grain-oriented electrical steel sheet according to an embodiment of the present invention comprises the steps of: heating a slab satisfying the following formula 1 and including, by wt %, 3.2 to 4.0% of Si, 0.03 to 0.09% of C, 0.015 to 0.040% of A1, 0.04 to 0.15% of Mn, 0.001 to 0.005% of N, 0.01% or less of S (exclusive of 0%), and the balance of Fe and other inevitable impurities; hot rolling the slab to produce a hot rolled sheet; hot band annealing the hot rolled sheet to at a cracking temperature of 900 to 980□ for 30 to 300 seconds; cold rolling the hot rolled sheet, which has completely been hot band annealed, to produce a cold rolled sheet; subjecting the cold rolled sheet to primary recrystallization annealing; and conducting secondary recrystallization annealing for the cold rolled sheet which has completely been primary recrystallization annealed. 1. A method for producing a grain-oriented electrical steel sheet comprising:heating a slab satisfying the following formula 1 and including, by wt %, 3.2 to 4.0% of Si, 0.03 to 0.09% of C, 0.015 to 0.040% of A1, 0.04 to 0.15% of Mn, 0.001 to 0.005% of N, 0.01% or less of S (exclusive of 0%), and the balance of Fe and other inevitable impurities;hot rolling the slab to produce a hot rolled sheet;hot band annealing the hot rolled sheet at a cracking temperature of 900 to 980□ for 30 to 300 seconds;cold rolling the hot rolled sheet, which has completely been hot band annealed, to produce a cold rolled sheet;subjecting the cold rolled sheet to primary recrystallization annealing; and {'br': None, '[Mn]×[S]≤0.0004\u2003\u2003[Formula 1]'}, 'conducting secondary recrystallization annealing for the cold rolled sheet which has completely been primary recrystallization annealed.'}(wherein [Mn] and [S] are contents (wt %) of Mn and S in the slab, respectively.)2. The method of claim 1 , wherein:the slab further includes 0.03 to 0.15 wt % of at least one of Sb and Sn, 0.01 to 0.05 wt % of P, and 0 ...

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Номер записи: 25
30-01-2020 дата публикации

GRAIN-ORIENTED ELECTRICAL STEEL SHEET AND PRODUCTION METHOD THEREFOR

Номер: US20200035392A1
Автор: Inoue Hirotaka, Omura Takeshi, Takajo Shigehiro
Принадлежит: JFE STEEL CORPORATION

Disclosed is a grain-oriented electrical steel sheet including: closure domains, each containing a discontinuous region at a part thereof and extending at an angle within 30° with respect to a transverse direction of the steel sheet, wherein a closure domain overlapping portion in the discontinuous region on one surface of the steel sheet has a length α in the transverse direction that is longer than a length β in the transverse direction of the closure domain overlapping portion on the other surface of the steel sheet, and the length α satisfies 0.5≤α≤5.0 and the length β satisfies 0.2α≤β≤0.8α. Consequently, the iron loss and the deterioration of magnetostrictive properties are suppressed in discontinuous regions, which would be inevitably formed when magnetic domain refining treatment is performed using a plurality of irradiation devices. 1. A grain-oriented electrical steel sheet comprising: closure domains , each containing a discontinuous region at a part thereof and extending at an angle within 30° with respect to a transverse direction of the steel sheet , wherein a closure domain overlapping portion in the discontinuous region on one surface of the steel sheet has a length α in millimeters (mm) in the transverse direction that is longer than a length β in mm in the transverse direction of the closure domain overlapping portion on the other surface of the steel sheet , and the length α in mm satisfies the following Expression (1) and the length β in mm satisfies the following Expression (2):{'br': None, '0.5 (mm)≤α (mm)≤5.0 (mm)\u2003\u2003(1)'}{'br': None, '0.2α (mm)≤β (mm)≤0.8α (mm)\u2003\u2003(2).'}2. A method of producing a grain-oriented electrical steel sheet , comprising: irradiating the steel sheet with a high energy beam from each of a plurality of high energy beam irradiation devices to form closure domains , each containing a discontinuous region at a part thereof and extending at an angle within 30° with respect to a transverse direction of the ...

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Номер записи: 26
08-02-2018 дата публикации

GRAIN-ORIENTED ELECTRICAL STEEL SHEET AND METHOD FOR PRODUCING SAME

Номер: US20180037966A1
Автор: Hayakawa Yasuyuki, Senda Kunihiro, TERASHIMA Takashi
Принадлежит: JFE STEEL CORPORATION

A grain-oriented electrical steel sheet having a composition containing, in mass %, C: 0.005% or less, Si: 2.0% to 4.5%, and Mn: 0.5% or less, and also containing Sb and P in respective ranges satisfying 0.01%≦[% Sb]≦0.20% and 0.02%≦[% P]≦2.0×[% Sb], with a balance being Fe and incidental impurities, wherein when the steel sheet is excited to 1.0 T at 50 Hz in a rolling transverse direction, a magnetizing force (TD-H) and an iron loss (TD-W) are respectively (TD-H)≧200 A/m and (TD-W)≧1.60 W/kg. Thus, a grain-oriented electrical steel sheet having excellent transformer core loss can be obtained industrially stably at low cost. 1. A grain-oriented electrical steel sheet having a composition containing , in mass % , C: 0.005% or less , Si: 2.0% to 4.5% , and Mn: 0.5% or less , and also containing Sb and P in respective ranges satisfying 0.01%≦[% Sb]≦0.20% and 0.02%≦[% P]≦2.0×[% Sb] , with a balance being Fe and incidental impurities ,{'sub': 10', '10', '10', '10, 'wherein when the steel sheet is excited to 1.0 T at 50 Hz in a rolling transverse direction, a magnetizing force (TD-H) and an iron loss (TD-W) are respectively (TD-H)≧200 A/m and (TD-W)≧1.60 W/kg.'}2. The grain-oriented electrical steel sheet according to claim 1 ,wherein the composition further contains, in mass %, one or more selected from Ni: 0.005% to 1.50%, Sn: 0.03% to 0.20%, Cu: 0.02% to 0.50%, Cr: 0.02% to 0.50%, Mo: 0.01% to 0.50%, and Nb: 0.002% to 0.01%.3. A method for producing a grain-oriented electrical steel sheet claim 1 , comprising:providing a steel slab having a composition containing, in mass %, C: 0.08% or less, Si: 2.0% to 4.5%, and Mn: 0.5% or less, containing each of S, Se, and O: less than 50 ppm, N: less than 60 ppm, and sol.Al: less than 100 ppm, and also containing Sb and P in respective ranges satisfying 0.01%≦[% Sb]≦0.20% and 0.02%≦[% P]≦2.0×[% Sb], with a balance being Fe and incidental impurities;optionally reheating the steel slab;thereafter hot rolling the steel slab to ...

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Номер записи: 27
24-02-2022 дата публикации

NON-ORIENTED ELECTRICAL STEEL SHEET AND METHOD FOR PRODUCING SAME

Номер: US20220056548A1
Автор: MIYAMOTO Yukino, Oda Yoshihiko, Okubo Tomoyuki, TANAKA Takaaki, Zaizen Yoshiaki
Принадлежит: JFE STEEL CORPORATION

A non-oriented electrical steel sheet having high magnetic flux density and a low iron loss at a high frequency is produced by subjecting a slab containing, in mass %, C: not more than 0.0050%, Si: 2.8 to 6.5%, Mn: 0.05 to 2.0%, P: not more than 0.10%, S: not more than 0.0050%, Al: 0.3 to 2.0%, N: not more than 0.0050% and Zn: 0.0005 to 0.0050% to a hot rolling, a hot-band annealing, a cold rolling and a finish annealing, a dew point in the hot-band annealing is set to 0 to 70 ° C. and an atmosphere of the finish annealing has a nitrogen content of not more than 30 vol % and a dew point of not higher than −20° C., and a ratio of the amount of nitrogen present as AlN in an entire sheet thickness to the amount of nitrogen present as AlN in a layer from one-side surface of steel sheet to a depth of 1/20 of sheet thickness is made to not less than 5.0. 1. A non-oriented electrical steel sheet having a chemical composition comprising C: not more than 0.0050 mass % , Si: 2.8 to 6.5 mass % , Mn: 0.05 to 2.0 mass % , P: not more than 0.10 mass % , S: not more than 0.0050 mass % , Al: 0.3 to 2.0 mass % , N: not more than 0.0050 mass % , Zn: 0.0005 to 0.0050 mass % , Ti: not more than 0.0030 mass % , Nb: not more than 0.0030 mass % , O: not more than 0.0050 mass % and the remainder being Fe and inevitable impurities , characterized in that t , Nand Nsatisfy the following equation (1):{'br': None, 'i': t×N', 't/', 'N, 'sub': 2', '1, '()/{(10)×}≥5.0 \u2003\u2003(1),'}{'sub': 1', '2, 'where t (mm) represents a steel sheet thickness, N(mass %) represents a concentration of nitrogen present as AlN in a layer from a one-side surface of the steel sheet to a depth of 1/20 of the sheet thickness, and N(mass %) represents a nitrogen concentration present as AlN in an entire sheet thickness.'}2. The non-oriented electrical steel sheet according to claim 1 , which contains one or two selected from Sn: 0.005 to 0.20 mass % and Sb: 0.005 to 0.20 mass % claim 1 , in addition to the above ...

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Номер записи: 28
06-02-2020 дата публикации

Non-oriented electrical steel sheet

Номер: US20200040423A1
Автор: Hiroki HORI, Hiroshi Fujimura, Hiroyoshi Yashiki, Kazutoshi Takeda, Miho Tomita, O Uyama, Takeaki Wakisaka, Takuya Matsumoto, Tesshu Murakawa, Yoshiaki Natori, Yuuya GOHMOTO
Принадлежит: Nippon Steel Corp

A non-oriented electrical steel sheet includes, as a chemical composition, by mass %: C: 0.0015% to 0.0040%; Si: 3.5% to 4.5%; Al: 0.65% or less; Mn: 0.2% to 2.0%; Sn: 0% to 0.20%; Sb: 0% to 0.20%; P: 0.005% to 0.150%; S: 0.0001% to 0.0030%; Ti: 0.0030% or less; Nb: 0.0050% or less; Zr: 0.0030% or less; Mo: 0.030% or less; V: 0.0030% or less; N: 0.0010% to 0.0030%; O: 0.0010% to 0.0500%; Cu: less than 0.10%; Ni: less than 0.50%; and a remainder including Fe and impurities, in which a product sheet thickness is 0.10 mm to 0.30 mm, an average grain size is 10 μm to 40 μm, an iron loss W10/800 is 50 W/Kg or less, a tensile strength is 580 MPa to 700 MPa, and a yield ratio is 0.82 or more.

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Номер записи: 29
15-02-2018 дата публикации

GRAIN-ORIENTED ELECTRICAL STEEL SHEET

Номер: US20180043474A1
Автор: Hamamura Hideyuki, Imai Hirofumi, Mogi Hisashi, OKUMURA Shunsuke, Sakai Tatsuhiko, Takahashi Fumiaki
Принадлежит: NIPPON STEEL & SUMITOMO METAL CORPORATION

Provided is a grain-oriented electrical steel sheet including a steel sheet having a steel sheet surface in which a groove, which extends in a direction intersecting a rolling direction and of which a groove depth direction matches a sheet thickness direction, is formed. When an average value of a groove depth in a sheet thickness direction at a central portion of the groove in a longitudinal groove direction is set as an average groove depth D, a straight line, which connects a first point at which a groove depth in the sheet thickness direction becomes 0.05×D and a second point at which the groove depth becomes 0.50×D, at an inclined portion of the groove is set as a groove end straight line, an angle made by the steel sheet surface and the groove end straight line is set as a first angle θ, and an average value of a groove-width-direction length, which is a length of a line segment connecting two points at which a groove depth in the sheet thickness direction in a contour of the groove on the groove-width-direction cross-section becomes 0.05×D, is set as an average groove width W, an aspect ratio A obtained by dividing the average groove depth D by the average groove width W, and the first angle θ satisfy the following Expression (1). 1. A grain-oriented electrical steel sheet , comprising:a steel sheet having a steel sheet surface in which a groove, which extends in a direction intersecting a rolling direction and of which a groove depth direction matches a sheet thickness direction, is formed,wherein the groove includes an inclined portion that is inclined from the steel sheet surface to a bottom portion of the groove at a groove end in a longitudinal groove direction that is a direction in which the groove extends, {'br': None, 'i': 'A+', 'θ<−21×77\u2003\u2003(1).'}, 'when an average value of a depth of the groove in the sheet thickness direction from a height of the steel sheet surface at a central portion in the longitudinal groove direction is set as an ...

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Номер записи: 30
19-02-2015 дата публикации

STEEL SHEET FOR ROTOR CORE FOR IPM MOTOR, AND METHOD FOR MANUFACTURING SAME

Номер: US20150047757A1
Автор: Fujiwara Susumu, IWATSU Tomonaga, Katagiri Yukio, KAWAMOTO Akito
Принадлежит: NISSHIN STEEL CO., LTD.

The present invention provides a steel sheet for a rotor core for an IPM motor, wherein the steel sheet has a magnetic flux density Bof 1.65 T or more as measured when magnetic field strength is 8000 A/m, and a residual magnetic flux density Br of 0.5 T or more as measured at that time, and optionally, a coercivity Hc of 100 A/m or more as measured after magnetization reaches 8000 A/m. By using the steel sheet of the present, invention for a rotor core of an IPM motor, it is possible to increase further an output torque in a high-speed rotational range and raise further the maximum, rotational speed. 1165. A steel sheet for a rotor core for an IPM motor , wherein the steel sheet has a magnetic flux density Bof . T or more as measured when magnetic field strength is 8000 A/m and a residual magnetic flux density Br of 0.5 T or more as measured at that time.2. The steel sheet for a rotor core for an IPM motor according to claim 1 , wherein the steel sheet has a coercivity Hc of 100 A/m or more as measured after magnetization reaches 8000 A/m.3. The steel sheet for a rotor core for an IPM motor according to claim 1 , wherein the steel sheet has a yield strength of 780 N/mmor more according to a tensile test.4. The steel sheet for a rotor core for an IPM motor according to claim 1 , wherein the steel sheet has a composition consisting of C: more than 0.0005% by mass to 0.90% by mass claim 1 , Si: 0% by mass to 3.0% by mass claim 1 , Mn: 0% by mass to 2.5% by mass claim 1 , P: 0.05% by mass or less claim 1 , S: 0.02% by mass or less claim 1 , acid-soluble Al: 0.005% by mass to 3.0% by mass claim 1 , and Si+Al: 5.0% by mass or less claim 1 , with a balance of Fe and inevitable impurities.5. The steel sheet for a rotor core for an IPM motor according to claim 4 , wherein the content of C is 0.05% by mass to 0.90% by mass.6. The steel sheet for a rotor core for an IPM motor according to claim 4 , further comprising one or more components selected from the group consisting of ...

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Номер записи: 31
16-02-2017 дата публикации

PROCESS FOR THE PRODUCTION OF GRAIN NON-ORIENTED ELECTRIC STEEL STRIP, WITH AN HIGH DEGREE OF COLD REDUCTION

Номер: US20170044641A1
Автор: Fortunati Stefano
Принадлежит:

A process for the production of grain non-oriented electric Fe—Si steel strips, with excellent electric and/or magnetic characteristics to be used preferably for construction of electrical machines is disclosed. 4. The process according to wherein one or more elements of the series Ti claim 3 , V claim 3 , Zr claim 3 , Nb claim 3 , Mo claim 3 , Ta claim 3 , W claim 3 , Cr claim 3 , Co claim 3 , Ni claim 3 , Cu are present in the steel the content being such that the sum of their % by weight is less than 1.5% and one or more elements of the series P claim 3 , Sb claim 3 , Sn claim 3 , Pb claim 3 , Bi claim 3 , Se are present in the steel the content being such that the sum of their % by weight is less than 1.0%.7. The process according to wherein the sheet after the last cold rolling has a final thickness between 0.15 and 0.50 mm.8. The process according to claim 1 , wherein the final in continuous recrystallization annealing and growth of crystal grains occurs in one or more annealing chambers at temperature between 850° C. and 1200° C. for a time between 5 seconds and 90 seconds.9. The process according to wherein the first cold rolling is conducted using work cylinder with a diameter between 150 mm and 350 mm claim 1 , with a sheet temperature between 30 and 300° C. and applying a rolling strength to the sheet lower than 500 N/mm.10. A non-oriented grain electric steel strip obtainable according to it has a thickness (sp) between 0.15 mm and 1.0 mm claim 1 , and magnetic losses measured at 1.5 Tesla and 50 Hz (P15) lower or equal to the result of the following relationship: P15 (w/kg)<[4.6*(sp)̂2−1.6*(sp)+2].11. The process according to claim 5 , wherein the rolling stands are positioned in sequence by interposing between the laminating cylinders an oil-in-water emulsion lubricant at a concentration in the range of 1-8% by volume. The present invention relates to a process for the production of grain non-oriented electric Fe—Si steel strips, with excellent ...

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Номер записи: 32
03-03-2022 дата публикации

NON-ORIENTED ELECTRICAL STEEL SHEET AND METHOD FOR PRODUCING SAME

Номер: US20220064751A1
Автор: Oda Yoshihiko, Okubo Tomoyuki, TANAKA Takaaki, Zaizen Yoshiaki
Принадлежит: JFE STEEL CORPORATION

In a production of a non-oriented electrical steel sheet comprising subjecting a slab containing a particular composition to a hot rolling, a hot-band annealing, a cold rolling to form a cold-rolled sheet and a finish annealing, a rolling reduction of a final finish rolling pass in the hot rolling is not less than 10%, and a coiling temperature is not higher than 620° C., and a soaking temperature in the finish annealing is 600 to 800° C. to achieve such properties that a recrystallization ratio is less than 100% as an area ratio, a strength C is not less than 2.0 and a strength difference C-D is not more than 2.0, where C is a strength at ϕ=0° and φ=0° and D is a strength at ϕ=20° and φ=0° in a section of ϕ=45° of ODF obtained in a central layer of a sheet thickness. 1. A non-oriented electrical steel sheet having a chemical composition comprising C: not more than 0.0050 mass % , Si: 3.2 to 5.0 mass % , Mn: not more than 2.0 mass % , P: not more than 0.02 mass % , S: not more than 0.0050 mass % , Al: 0.5 to 2.0 mass % , N: not more than 0.0050 mass % , Ti: not more than 0.0030 mass % , Nb: not more than 0.0010 mass % , V: not more than 0.0050 mass % , 0: not more than 0.0050 mass % , provided that Si+Al≥4.0 mass % , and the remainder being Fe and inevitable impurities , characterized in thata recrystallization ratio is less than 100% as an area ratio,a strength C is not less than 2.0, anda strength difference C-D is not more than 2.0,{'sub': 1', '1', '2, 'where C is a strength at ϕ=0° and φ=0° and D is a strength at ϕ=20° and φ=0° in a section of φ=45° of ODF obtained in a central layer of a sheet thickness.'}2. The non-oriented electrical steel sheet according to claim 1 , whereinthe non-oriented electrical steel sheet contains at least one group selected from following groups A to C:Group A: one or two selected from Sn and Sb by 0.005 to 0.20 mass % each,Group B: one or more selected from Ca, Mg and REM by 0.0005 to 0.010 mass % each, andGroup C: at least one ...

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Номер записи: 33
14-02-2019 дата публикации

GRAIN-ORIENTED ELECTRICAL STEEL SHEET

Номер: US20190048434A1
Автор: Hamamura Hideyuki, HAYASHI Shinya, Imai Hirofumi, MIZOKAMI Masato, MIZUMURA Takahito, Mogi Hisashi, Murakami Kenichi, Takahashi Fumiaki
Принадлежит: NIPPON STEEL & SUMITOMO METAL CORPORATION

A grain-oriented electrical steel sheet includes a steel sheet having a surface on which grooves in which an extending direction crosses a rolling direction and a depth direction is parallel to a sheet thickness direction are formed. A molten solidified substance ranging in parallel to the groove exists on both sides of the groove on a surface of the steel sheet. A height becoming a maximum frequency in a height distribution of height data in which the surface of the steel sheet in a specific area including the groove is measured at regular intervals is set as a virtual plane, and when a space volume of recess parts recessed from the virtual plane is set as V1 and a volume of projection parts projected from the virtual plane is set as V2, a value of V2/V1 is more than 0.10 and less than 0.80. A plurality of projections are formed in the specific area, and among the plurality of projections, a width of a projection closest to the groove is larger than widths of the other projections. When an area where an average height in the extending direction is highest in the height distribution is seen in a groove longitudinal cross section including the extending direction and the sheet thickness direction, an average roughness Ra of a roughness curve forming a surface of the area is 0.30 to 2.00 μm, and an average length RSm of a roughness curve element forming the surface of the area is 10 to 150 μm. 1. A grain-oriented electrical steel sheet comprisinga steel sheet having a surface on which grooves in which an extending direction crosses a rolling direction and a depth direction is parallel to a sheet thickness direction are formed,wherein a molten solidified substance ranging in parallel to the groove exists on both sides of the groove on the surface of the steel sheet,wherein a height becoming a maximum frequency in a height distribution of height data in which the surface of the steel sheet in a specific area including the groove is measured at regular intervals is set ...

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Номер записи: 34
05-03-2015 дата публикации

Method of producing non-oriented electrical steel sheet

Номер: US20150059929A1
Автор: Hiroaki Toda, Tadashi Nakanishi, Yoshiaki Zaizen, Yoshihiko Oda
Принадлежит: JFE Steel Corp

A non-oriented electrical steel sheet having a high magnetic flux density and a low iron loss is produced by hot rolling a steel slab including C: not more than 0.005 mass %, Si: not more than 4 mass %, Mn: 0.03˜3 mass %, Al: not more than 3 mass %, P: 0.03˜0.2 mass %, S: not more than 0.005 mass %, N: not more than 0.005 mass %, Ca: 0.0005˜0.01 mass %, provided that an atom ratio to S (Ca (mass %)/40)/(S (mass %)/32) is within a range of 0.5˜3.5, and the balance being Fe and incidental impurities, hot band annealing, cold rolling and then conducting recrystallization annealing by heating at an average temperature rising rate of not less than 100° C./sec up to at least 740° C.

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Номер записи: 35
10-03-2022 дата публикации

Annealing separator for grain-oriented electrical steel sheet and method of producing grain-oriented electrical steel sheet

Номер: US20220074012A1
Автор: Karin Kokufu, Makoto Watanabe, Takashi Terashima, Toshito Takamiya
Принадлежит: JFE Steel Corp

Provided is an annealing separator with which a grain-oriented electrical steel sheet having a forsterite film with excellent appearance uniformity and adhesion can be obtained. The annealing separator for grain-oriented electrical steel sheet comprises: magnesia that contains 0.05 mass % or more and 0.20 mass % or less of B and 0.01 mass % or more and 0.10 mass % or less of P, and titanium oxide in 1.0 part by mass or more and 10.0 parts by mass or less per 100 parts by mass of the magnesia where the titanium oxide contains one or more types of alkali metals in a total amount of 0.0050 mass % or more and 0.50 mass % or less, where an amount of P adsorbed on per 1 g of the titanium oxide is 1.5×10−4 g or more and 1.0×10−3 g or less.

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Номер записи: 36
21-02-2019 дата публикации

METHOD OF PRODUCING GRAIN-ORIENTED ELECTRICAL STEEL SHEET

Номер: US20190055619A1
Автор: EHASHI Yuiko, Hayakawa Yasuyuki, Imamura Takeshi, Takashima Minoru
Принадлежит: JFE STEEL CORPORATION

To provide a grain-oriented electrical steel sheet that has better magnetic property than conventional ones, in hot band annealing of the hot rolled steel sheet obtained by a predetermined step, an average heating rate from ordinary temperature to 400° C. is set to 50° C./s or more, and a time to reach 900° C. from 400° C. is set to 100 sec or less. 1. A method of producing a grain-oriented electrical steel sheet , comprising: C: 0.002 mass % or more and 0.100 mass % or less,', 'Si: 2.00 mass % or more and 6.50 mass % or less,', 'Mn: 0.02 mass % or more and 1.00 mass % or less,', 'S: 50 mass ppm or less,', 'N: 50 mass ppm or less,', 'Se: 50 mass ppm or less,', 'acid-soluble Al: less than 100 mass ppm, and', 'a balance being Fe and inevitable impurities;, 'heating a steel slab at 1300° C. or less, the steel slab having a chemical composition containing'}subjecting the steel slab to hot rolling, to obtain a hot rolled steel sheet;subjecting the hot rolled steel sheet to hot band annealing;subjecting the hot rolled steel sheet after the hot band annealing to cold rolling once, or twice or more with intermediate annealing performed therebetween, to obtain a cold rolled steel sheet having a final sheet thickness;subjecting the cold rolled steel sheet to primary recrystallization annealing; andapplying an annealing separator to a surface of the cold rolled steel sheet after the primary recrystallization annealing, and thereafter subjecting the cold rolled steel sheet to secondary recrystallization annealing,wherein in the hot band annealing, an average heating rate from ordinary temperature to 400° C. is set to 50° C./s or more, and a time to reach 900° C. from 400° C. is set to 100 sec or less.2. The method of producing a grain-oriented electrical steel sheet according to claim 1 , Sb: 0.01 mass % or more and 0.50 mass % or less,', 'Sn: 0.01 mass % or more and 0.50 mass % or less,', 'Ni: 0.005 mass % or more and 1.5 mass % or less,', 'Cu: 0.005 mass % or more and 1.5 ...

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Номер записи: 37
20-02-2020 дата публикации

LASER-SCRIBED GRAIN-ORIENTED SILICON STEEL RESISTANT TO STRESS-RELIEF ANNEALING AND MANUFACTURING METHOD THEREFOR

Номер: US20200058434A1
Автор: GUO Jianguo, JI Yaming, Li Guobao, Ling Chen, Ma Changsong, Wu Meihong, XIE Weiyong, Yang Yongjie, ZHAO Zipeng
Принадлежит: BAOSHAN IRON & STEEL CO., LTD.

A laser-scribed grain-oriented silicon steel resistant to stress-relief annealing and a manufacturing method therefor. Parallel linear grooves () are formed on one or both sides of grain-oriented silicon steel () by laser etching. The linear grooves () are perpendicular to, or at an angle to, the rolling direction of the steel plate. A maximum height of edge protrusions of the linear grooves () does not exceed 5 μm, and a maximum height of spatters in etch-free regions between adjacent linear grooves () does not exceed 5 μm, and the proportion of an area occupied by spatters in the vicinity of the linear grooves () does not exceed 5%. The steel has low manufacturing costs, and the etching effect of the finished steel is retained during a stress-relief annealing process. The steel is suitable for manufacturing of wound iron core transformers. 1. A laser-scribed grain-oriented silicon steel resistant to stress-relief annealing , wherein parallel linear grooves are formed on one or both sides of grain-oriented silicon steel by laser etching , wherein the linear grooves are perpendicular to , or at an angle to , the direction of rolling the silicon steel into a steel plate; a maximum height of edge protrusions of the linear grooves does not exceed 5 μm , and a maximum height of spatters in etch-free regions between adjacent linear grooves does not exceed 5 μm , and the proportion of an area occupied by spatters in the vicinity of the linear grooves does not exceed 5%.2. The laser-scribed grain-oriented silicon steel resistant to stress-relief annealing of claim 1 , wherein the heights of the spatters do not exceed 2 μm claim 1 , and the proportion of spatters per unit area does not exceed 2.5%.3. The laser-scribed grain-oriented silicon steel resistant to stress-relief annealing of claim 1 , wherein a line roughness Rof a center line in the bottom of the linear grooves is not more than 2.1 μm.4. The laser-scribed grain-oriented silicon steel resistant to stress-relief ...

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Номер записи: 38
08-03-2018 дата публикации

NON-ORIENTED ELECTRICAL STEEL SHEET, PRODUCTION METHOD THEREFOR, AND MOTOR CORE

Номер: US20180066333A1
Автор: Nakajima Hiroaki, Nakanishi Tadashi, Oda Yoshihiko, Okubo Tomoyuki
Принадлежит: JFE STEEL CORPORATION

In the production of a non-oriented electrical stress sheet by hot rolling a slab having a chemical composition comprising, by mass %, C: not more than 0.005, Si: 1.5-6.0, Mn: 0.05-2.0 and P: 0.03-0.15, subjecting to a hot band annealing, if necessary, cold rolling, finish annealing, and forming an insulation coating, the cooling from 700° C. to 500° C. in the finish annealing is conducted in an oxidizing atmosphere with an oxygen potential P/Pof not less than 0.001 for 1-300 seconds, whereby P is segregated into the surface of the steel sheet after the finish annealing to obtain a non-oriented electrical steel sheet enhancing a crystal grain growth properties in the stress relief annealing. 1. A non-oriented electrical steel sheet having a chemical composition comprising C: not more than 0.005 mass % , Si: 1.5-6.0 mass % , Mn: 0.05-2.0 mass % , P: 0.03-0.15 mass % , S: not more than 0.005 mass % , N: not more than 0.005 mass % , Al: not more than 0.005 mass % and the remainder being Fe and inevitable impurities , wherein a ratio (P/Fe) of a peak to peak height Pof P near to an electronic energy of 120 eV to a peak to peak height Feof Fe near to an electronic energy of 700 eV in an Auger differential spectrum obtained by analyzing a surface of the steel sheet after a finish annealing by an Auger electron spectroscopy is not less than 0.02.2. The non-oriented electrical steel sheet according to claim 1 , characterized by containing one or two selected from Sn: 0.005-0.2 mass % and Sb: 0.005-0.2 mass % in addition to the chemical composition.3. The non-oriented electrical steel sheet according to claim 1 , characterized in that a yield strength is not less than 400 MPa.4. A method of producing a non-oriented electrical steel sheet by hot rolling a slab having a chemical composition as claimed in claim 1 , pickling without a hot band annealing or after a hot band annealing or a self-annealing claim 1 , performing one cold rolling or two or more cold rollings ...

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Номер записи: 39
08-03-2018 дата публикации

GRAIN-ORIENTED ELECTRICAL STEEL SHEET

Номер: US20180066334A1
Автор: Hamamura Hideyuki, Imai Hirofumi, Mogi Hisashi, OKUMURA Shunsuke, Sakai Tatsuhiko, Takahashi Fumiaki
Принадлежит: NIPPON STEEL & SUMITOMO METAL CORPORATION

Provided is a grain-oriented electrical steel sheet including a steel sheet having a steel sheet surface in which a groove, which extends in a direction intersecting a rolling direction and of which a groove depth direction matches a sheet thickness direction, is formed. In a case where the groove is seen on a longitudinal groove cross-section including a groove extension direction and the sheet thickness direction, an arithmetic average height Ra of a roughness curve, which constitutes a contour of a groove bottom region of the groove, is 1 μm to 3 μm, and an average length RSm of a roughness curve element, which constitutes the contour of the groove bottom region, is 10 μm to 150 μm. 1. A grain-oriented electrical steel sheet , comprising:a steel sheet having a steel sheet surface in which a groove, which extends in a direction intersecting a rolling direction and of which a groove depth direction matches a sheet thickness direction, is formed,wherein in a case where the groove is seen on a longitudinal groove cross-section including a groove extension direction and the sheet thickness direction, an arithmetic average height Ra of a roughness curve, which constitutes a contour of a groove bottom region of the groove, is 1 μm to 3 μm, and an average length RSm of a roughness curve element, which constitutes the contour of the groove bottom region, is 10 μm to 150 μm,the grain-oriented electrical steel sheet further includes an insulating film,in a case where the groove is seen on a transverse groove cross-section that is perpendicular to the groove extension direction, when a region, which is spaced away from a base point, that is a boundary between the groove and the steel sheet surface, by 10 μm to 500 μm in a direction that is perpendicular to the sheet thickness direction and points away from the groove on the transverse groove cross-section, is defined as a particle existing region, the insulating film in the particle existing region includes iron-containing ...

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Номер записи: 40
08-03-2018 дата публикации

GRAIN-ORIENTED ELECTRICAL STEEL SHEET AND METHOD FOR MANUFACTURING SAME

Номер: US20180066346A1
Автор: Imamura Takeshi, Takenaka Masanori, WAKISAKA Yuiko
Принадлежит: JFE STEEL CORPORATION

Provided are a grain-oriented electrical steel sheet with low iron loss even when including at least one grain boundary segregation element among Sb, Sn, Mo, Cu, and P, and a method for manufacturing the same. In our method, Pr is controlled to satisfy Pr≦−0.075T+18, where T>10, 5 Подробнее

Номер записи: 41
27-02-2020 дата публикации

NON-ORIENTED ELECTRICAL STEEL STRIP FOR ELECTRIC MOTORS

Номер: US20200063229A1
Автор: FISCHER Olaf, SIERON Sebastian, STRAUSS Silke, TELGER Karl, TIETZ Marco, VIDOVIC Anton
Принадлежит:

The invention relates to a non-oriented electrical steel strip or sheet, in particular for electrical engineering applications, an electrical engineering component produced from such an electrical steel strip or sheet, a process for producing an electrical steel strip or sheet and the use of such an electrical steel strip or sheet in components for electrical engineering applications. 1. A non-oriented electrical steel strip or sheet , wherein a ratio of a polarization at a field strength of 100 A/m Jto a polarization at a field strength of 2500 A/m J , in each case measured at 50 Hz , is at least 0.5 , wherein the electrical steel strip or sheet has a thickness of not more than 0.35 mm and a specific electrical resistance is from 0.40 to 0.70 μΩm at a temperature of 50° C.2. The non-oriented electrical steel strip or sheet as claimed in claim 1 , wherein the non-oriented electrical steel strip or sheet is produced from a steel containingSi: from 2.30 to 3.40% by weight,Al: from 0.30 to 1.10% by weight,Mn: from 0.07 to 0.25% by weight,P: up to 0.030% by weight,in addition to iron and unavoidable impurities.3. The non-oriented electrical steel strip or sheet as claimed in wherein the non-oriented electrical steel strip or sheet has a grain size of from 50 to 130 μm claim 1 , preferably from 70 to 100 μm.4. The non-oriented electrical steel strip or sheet as claimed in wherein the non-oriented electrical steel strip or sheet has loss values (mixed values) of P<2.8 W/kg claim 2 , P<16 W/kg and P<210 W/kg.5. The non-oriented electrical steel strip or sheet as claimed in wherein the specific electrical resistance is from 0.52 to 0.67 μΩm.6. The non-oriented electrical steel strip or sheet as claimed in wherein the ratio of the polarization at a field strength of 100 A/m Jto the polarization at a field strength of 200 A/m J claim 1 , in each case measured at 50 Hz claim 1 , is from at least 0.59 to 1.0.7. The non-oriented electrical steel strip or sheet as claimed in ...

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Номер записи: 42
27-02-2020 дата публикации

GRAIN-ORIENTED ELECTRICAL STEEL SHEET AND METHOD FOR PRODUCING THE SAME

Номер: US20200063234A1
Автор: Suehiro Ryuichi, Takamiya Toshito, Watanabe Makoto
Принадлежит: JFE STEEL CORPORATION

A grain-oriented electrical steel sheet having excellent iron loss property is produced from a steel slab containing, by mass %, C: 0.002-0.15%, Si: 2.5-6.0%, Mn: 0.01-0.80%, Al: 0.010-0.050% and N: 0.003-0.020%, when: a heating rate between 500-700° C. In decarburization annealing is not less than 80° C./s, a surface roughness Ra of a work roll in final cold rolling is 0.01-3.0 μm, a total content of alkaline earth metals to MgO in annealing separator is 0-5 mass %, an average length L in rolling direction of passed crystal grains is not more than 25 mm, a ratio of crystal grains having a length in rolling direction of not less than 0.5 μm is 40-90%, and an existence ratio of alkaline earth metal sulfides having a size corresponding to circle of not less than 0.5 μm in a cross section of forsterite film is not more than 0.2/μm per unit length in sheet width direction. 1. A grain-oriented electrical steel sheet having a chemical composition comprising C: not more than 0.005 mass % , Si: 2.5-6.0 mass % , Mn: 0.01-0.80 mass % , S: not more than 0.005 mass % , Se: not more than 0.005 mass % , N: not more than 0.005 mass % and the residue being Fe and inevitable impurities and provided on its surface with a forsterite film composed mainly of forsterite , characterized in thatan average length L in a rolling direction of crystal grains that penetrate through the steel sheet in the thickness direction thereof is not more than 25 mm,a number ratio P of crystal grains having a length in the rolling direction of not more than 5 mm to total crystal grains is within the range of 40 to 90%, andan existence ratio of sulfides of at least one alkaline earth metal selected from Ca, Sr and Ba having a circle-equivalent diameter of not less than 0.5 μm when observing a cross section of the forsterite film in the sheet width direction is not more than 0.2/μm per unit length in the sheet width direction.2. The grain-oriented electrical steel sheet according to claim 1 ,which contains ...

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Номер записи: 43
08-03-2018 дата публикации

GRAIN ORIENTED ELECTRICAL STEEL SHEET HAVING EXCELLENT CORE LOSS, AND METHOD FOR MANUFACTURING SAME

Номер: US20180068769A1
Автор: Hong Byung-Deug, KIM Dong-kyun
Принадлежит:

The present invention relates to a grain oriented electrical steel sheet having excellent core loss and to a method for manufacturing same. The electrical steel sheet according to one aspect of the present invention may have a composition comprising, by weight %, Si: 1.0 to 4.0%, Al: 0.1 to 4.0%, and a rare earth element: 0.0001 to 0.5% by the total content of the whole rare earth element. 1. A method for manufacturing an electrical steel sheet having a low degree of core loss of 0.901 W/kg or lower (W17/50) , the method comprising:heating a slab to 1050° C. to 1300° C., the slab comprising, by wt %, silicon (Si): 1.0% to 4.0%, aluminum (Al): 0.1% to 4.0%, and at least one rare earth element: 0.065% to 0.4% and at least one selected from the group consisting of phosphorus (P): 0.5% or less, tin (Sn): 0.3% or less, antimony (Sb): 0.3% or less, chromium (Cr): 0.3% or less copper (Cu): 0.4% or less, and nickel (Ni): 1% or less in total content;hot rolling the slab;cold rolling the slab;primarily recrystallizing the slab; andsecondarily recrystallizing the slab,wherein the at least one rare earth elements exist individually or in the form of a compound with sulfur (S) or oxygen (O) and the at least one rare earth element or the compound of the at least one rare earth element is used as an inhibitor.2. The method of claim 1 , wherein the slab further comprises carbon (C): 0.1 wt % or less claim 1 , manganese (Mn): 0.03 wt % to 0.2 wt % claim 1 , sulfur (S): 0.001 wt % to 0.05 wt % claim 1 , and nitrogen (N): 0.01 wt % or less.3. The method of claim 1 , wherein after the hot rolling of the slab claim 1 , the method further comprises at least one selected from;annealing the hot-rolled slab; andpickling the hot-rolled slab.4. The method of claim 1 , wherein the cold rolling is performed at a reduction ratio of 85% to 90%.5. The method of claim 4 , wherein the cold rolling is performed two or more times with an intermediate annealing process therebetween claim 4 , and a ...

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Номер записи: 44
24-03-2022 дата публикации

Grain-oriented electrical steel sheet and method for manufacturing the same

Номер: US20220090267A1
Автор: Shinji Yamamoto, Shinsuke TAKATANI, Shuichi Nakamura, Yoshiyuki Ushigami
Принадлежит: Nippon Steel Corp

A grain-oriented electrical steel sheet includes a base steel sheet which contains Si and Mn, an intermediate layer which is disposed on a surface of the base steel sheet and contains a silicon oxide as a main component, and an insulation coating which is disposed on a surface of the intermediate layer. A final-annealed film is not substantially present on a surface of the base steel sheet. In a surface layer region of grain-oriented electrical steel sheet, a Mn-depletion layer having a valley portion of a Mn content in which a Mn content is lower than an average Mn content of the base steel sheet in a region deeper than the surface layer region is provided, and a Mn-rich layer having a peak portion of a Mn content in which a Mn content is higher than that in the valley portion of the Mn content is provided in a region closer to a surface of the insulation coating than the Mn-depletion layer.

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Номер записи: 45
18-03-2021 дата публикации

ELECTRICAL STEEL STRIP THAT CAN BE BUT DOESN'T HAVE TO BE REANNEALED

Номер: US20210079493A1
Автор: FISCHER Olaf, KAHVECI Abdullah, SIERON Sebastian, SZARY Philipp, TELGER Karl
Принадлежит:

The invention relates to a non-grain-oriented electrical steel strip or sheet, in particular for electrical applications, an electrical component produced from such an electrical steel strip or sheet, a process for producing an electrical steel strip or sheet and the use of such an electrical strip or sheet in components for electrical applications. 1. A non-grain-oriented electrical steel strip or sheet containing , apart from iron and unavoidable impurities (figures in each case in % by weight)up to 0.0040 of C,from 0.1500 to 0.3000 of Mn,from 2.300 to 2.700 of Si,from 0.3000 to 0.8000 of Al,up to 0.0400 of P,up to 0.0035 of S,up to 0.0070 of N and up to 0.0070 of Ti,{'sub': 1.0/50', '1.0/50, 'wherein a ratio of magnetic loss Pin a finally heat treated step to magnetic loss Pin a reference heat treated state is at least 1.30.'}2. The non-grain-oriented electrical steel strip or sheet as claimed in wherein the non-grain-oriented steel strip or sheet claim 1 , has a thickness of from 0.26 to 0.38 mm.3. The non-grain-oriented electrical steel strip or sheet as claimed in wherein the reference heat treated state it has a grain size of from 50 to 130 μm.4. The non-grain-oriented electrical steel strip or sheet as claimed in claim 1 , wherein a ratio of magnetic loss Pin the finally heat treated state to magnetic loss Pin the reference heat treated state is at least 1.10.5. The non-grain-oriented electrical steel strip or sheet as claimed in claim 1 , wherein a ratio of magnetic loss Pin the finally heat treated state to magnetic loss Pin the reference heat treated state is at least 1.10.6. The non-grain-oriented electrical steel strip or sheet as claimed in claim 1 , wherein a ratio of polarization Jin the finally heat treated state to polarization Jin the reference heat treated state is at least 1.01.7. The non-grain-oriented electrical steel strip or sheet as claimed in claim 1 , wherein a yield point Rpis from 300 to 440 N/mm.8. The non-grain-oriented electrical ...

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Номер записи: 46
23-03-2017 дата публикации

Method for producing grain-oriented electrical steel sheet

Номер: US20170081740A1
Автор: Makoto Watanabe, Ryuichi Suehiro, Takashi Terashima, Toshito Takamiya
Принадлежит: JFE Steel Corp

In a method for producing a grain-oriented electrical steel sheet by subjecting a slab containing C: 0.002-0.10 mass %, Si: 2.5-6.0 mass %, Mn: 0.01-0.8 mass % and further containing Al and N, or S and/or Se, or Al, N, S and/or Se as inhibitor ingredients to hot rolling, hot band annealing, cold rolling, decarburization annealing, application of an annealing separator and finish annealing, when a certain temperature within a range of 700-800° C. in a heating process of the decarburization annealing is T 1 and a certain temperature as a soaking temperature within a range of 820-900° C. is T 2, a heating rate R 1 between 500° C. and T 1 is set to not less than 80° C./s and a heating rate R 2 between T 1 and T 2 is set to not more than 15° C./s, whereby a grain-oriented electrical steel sheet having excellent magnetic properties and peeling resistance of forsterite coating is obtained while ensuring decarburization property.

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Номер записи: 47
31-03-2022 дата публикации

Method for manufacturing grain-oriented electrical steel sheet

Номер: US20220098691A1
Автор: Masaru Takahashi, Masato Yasuda, Shohji Nagano, Yoichi Zaizen, Yoshiyuki Ushigami
Принадлежит: Nippon Steel Corp

A method for manufacturing a grain-oriented electrical steel sheet includes: heating a steel slab having a prescribed chemical composition to lower than 1250° C. and subjecting the steel slab to hot rolling to obtain a hot-rolled steel sheet; performing hot-band annealing on the hot-rolled steel sheet; pickling the hot-rolled steel sheet which has been subjected to the hot-band annealing; subjecting the hot-rolled steel sheet which has been subjected to the pickling to cold rolling to obtain a cold-rolled steel sheet having a final sheet thickness d of 0.15 to 0.23 mm; performing a decarburization nitriding treatment including decarburization annealing and nitriding on the cold-rolled steel sheet; performing final annealing on the cold-rolled steel sheet which has been subjected to the decarburization nitriding treatment; and then applying a coating liquid for insulation coating formation to the cold-rolled steel sheet which has been subjected to the final annealing and baking the cold-rolled steel sheet. Sol. Al/N which is a mass ratio between Sol. Al and N in the steel slab and the final sheet thickness d satisfy a prescribed relational expression, the N content of the cold-rolled steel sheet which has been subjected to the decarburization nitriding treatment is 40 to 1000 ppm, and a decarburization annealing temperature in the decarburization annealing is lower than 1000° C.

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Номер записи: 48
31-03-2022 дата публикации

METHOD FOR PRODUCING GRAIN ORIENTED ELECTRICAL STEEL SHEET

Номер: US20220098693A1
Автор: TAKATANI Shinsuke, Ushigami Yoshiyuki
Принадлежит: NIPPON STEEL CORPORATION

A method for producing a grain oriented electrical steel sheet includes a decarburization annealing process where an oxidation degree PHO/PHis controlled, an annealing separator applying process where a mass ratio of MgO and AlOin an annealing separator is controlled, a final annealing process where hydrogen in mixed gas atmosphere is controlled to 50 volume % or more, an annealing separator removing process where water-washing is conducted using solution with inhibitor and then pickling is conducted, a smoothing process where mixed gas and temperature are controlled for annealing, and an insulation coating forming process where a baking temperature and a heat treatment temperature are controlled. 1. A method for producing a grain oriented electrical steel sheet ,the method comprising:a hot rolling process of hot-rolling a steel piece to obtain a hot rolled steel sheet, the steel piece including, as a chemical composition, by mass %,0.030 to 0.100% of C,0.80 to 7.00% of Si,0.01 to 1.00% of Mn,0 to 0.060% in total of S and Se,0.010 to 0.065% of acid soluble Al,0.004 to 0.012% of N,0 to 0.30% of Cr,0 to 0.40% of Cu,0 to 0.50% of P,0 to 0.30% of Sn,0 to 0.30% of Sb,0 to 1.00% of Ni,0 to 0.008% of B,0 to 0.15% of V,0 to 0.20% of Nb,0 to 0.10% of Mo,0 to 0.015% of Ti,0 to 0.010% of Bi, anda balance consisting of Fe and impurities;a cold rolling process of cold-rolling the hot rolled steel sheet to obtain a cold rolled steel sheet;a decarburization annealing process of decarburization-annealing the cold rolled steel sheet to obtain a decarburization annealed sheet;{'sub': ['2', '3'], '#text': 'an annealing separator applying process of applying and drying an annealing separator including AlOand MgO to the decarburization annealed sheet;'}a final annealing process of final-annealing the decarburization annealed sheet after applying the annealing separator to obtain a final annealed sheet;an annealing separator removing process of removing a redundant annealing separator ...

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Номер записи: 49
31-03-2022 дата публикации

METHOD FOR MANUFACTURING GRAIN-ORIENTED ELECTRICAL STEEL SHEET

Номер: US20220098694A1
Автор: Fujii Hiroyasu, FUJII Norikazu, Nakamura Shuichi, Ushigami Yoshiyuki
Принадлежит: NIPPON STEEL CORPORATION

A method for manufacturing a grain-oriented electrical steel sheet includes: a silicon steel material production process of producing a silicon steel material; a hot rolling process of obtaining a hot rolled sheet by subjecting the silicon steel material to hot rolling; a cold rolling process of obtaining a steel sheet of a final sheet thickness by subjecting the hot rolled sheet to a single cold rolling process or multiple cold rolling processes having intermediate annealing performed between the cold rolling processes; a decarburization annealing process of subjecting the steel sheet to decarburization annealing; and a final annealing process of applying an annealing separator containing alumina as a main component to the steel sheet and subjecting the steel sheet to final annealing. The silicon steel material contains: in terms of mass %, Si: 0.8 to 7.0%; C: 0.085% or less; acid-soluble Al: 0.010 to 0.065%; N: 0.004 to 0.012%; Mn: 1.00% or less; S: 0.050% or less; a total of 0.01 to 0.20% of one or both of Sn and Sb; and the remainder: Fe and impurities. 1. A method for manufacturing a grain-oriented electrical steel sheet , comprising:a silicon steel material production process of producing a silicon steel material;a hot rolling process of obtaining a hot rolled sheet by subjecting the silicon steel material to hot rolling;a cold rolling process of obtaining a steel sheet of a final sheet thickness by subjecting the hot rolled sheet to a single cold rolling process or multiple cold rolling processes having intermediate annealing performed between the cold rolling processes;a decarburization annealing process of subjecting the steel sheet to decarburization annealing; anda final annealing process of applying an annealing separator containing alumina as a main component to the steel sheet and subjecting the steel sheet to final annealing,wherein the silicon steel material contains: in terms of mass %,Si: 0.8 to 7.0%;C: 0.085% or less;acid-soluble Al: 0.010 to 0. ...

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Номер записи: 50
21-03-2019 дата публикации

Method of producing grain-oriented electrical steel sheet

Номер: US20190085423A1
Автор: Masanori Takenaka, Yasuyuki Hayakawa, Yuiko EHASHI
Принадлежит: JFE Steel Corp

To improve and stabilize magnetic properties, a steel sheet is soaked in a temperature range of 1000° C. or more and 1120° C. or less for 200 sec or less and then soaked in a temperature range of 650° C. or more and 1000° C. or less for 200 sec or less in annealing before final cold rolling, and the amount of Al in precipitates after the annealing before the final cold rolling is limited to 50% or more of the total amount of Al contained in the steel slab.

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Номер записи: 51
30-03-2017 дата публикации

METHOD FOR PRODUCING GRAIN-ORIENTED ELECTRICAL STEEL SHEET

Номер: US20170088915A1
Автор: Imamura Takeshi, Suehiro Ryuichi, Takamiya Toshito, TERASHIMA Takashi, Watanabe Makoto
Принадлежит: JFE STEEL CORPORATION

A method for producing a grain-oriented electrical steel sheet by subjecting a slab of an inhibitor-less ingredient system containing C: 0.002-0.10 mass %, Si: 2.5-6.0 mass %, Mn: 0.010-0.8 mass % and extremely decreased Al, N, Se and S to hot rolling, hot band annealing, cold rolling, decarburization annealing, application of an annealing separator and finish annealing, when a certain temperature within range of 700-800° C. in a heating process of decarburization annealing is T1 and a certain temperature as a soaking temperature within a range of 820-900° C. is T2, a heating rate R1 between 500° C. and T1 is set to not less than 100° C./s and heating rate R2 between T1 and T2 is set to not more than 15° C./s, whereby grain-oriented electrical steel sheet having excellent iron loss property and coating peeling resistance is obtained in the inhibitor-less ingredient system while ensuring decarburization property even when rapid heating is performed during decarburization annealing. 16-. (canceled)7. A method for producing a grain-oriented electrical steel sheet by comprising a series of steps of subjecting a slab having a chemical composition comprising C: 0.002-0.10 mass % , Si: 2.5-6.0 mass % , Mn: 0.010-0.8 mass % , Al: less than 0.010 mass % , N: less than 0.0050 mass % , Se: less than 0.0030 mass % and S: less than 0.0050 mass % , provided that a mass ratio Al/N of Al and N is not less than 1.4 , and the remainder being Fe and inevitable impurities to hot rolling , hot band annealing , one or two or more cold rollings sandwiching an intermediate annealing therebetween , formation of subscale on steel sheet surface through decarburization annealing , application of an annealing separator composed mainly of MgO onto steel sheet surface and finish annealing , wherein when a certain temperature within a range of 700-800° C. in a heating process of the decarburization annealing is T1 and a certain temperature as a soaking temperature within a range of 820-900° C. is ...

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Номер записи: 52
19-03-2020 дата публикации

Method For Producing An Ausferritic Steel, Austempered During Continuous Cooling Followed By Annealing

Номер: US20200087753A1
Автор: Larker Richard
Принадлежит: Ausferritic AB

A method for producing an austempered steel is provided. The method includes subjecting a steel alloy having a silicon content of 1.5 to 4.4 weight percent and a carbon content of 0.3 to 0.8 weight percent to continuous cooling followed by annealing. The cooling rate is initially sufficiently fast to prevent predominant formation of proeutectoid ferrite or pearlite, while subsequently at intermediate temperatures, the cooling rate is sufficiently slow to allow a transformation of the austenite to mainly ausferrite during cooling. The annealing is able to complete the transformation of carbon enriched austenite to ausferrite and to temper any martensite previously formed. The method results in the cost-efficient production of one or more continuously cooled and annealed austempered steel components or semi-finished products having mainly an ausferritic microstructure. 1. A method for producing an austempered steel , comprisingsubjecting a steel alloy having a silicon content of 1.5 to 4.4 weight percent and a carbon content of 0.3 to 0.8 weight percent to continuous cooling followed by annealing,wherein the continuous cooling begins from a fully austenitic temperature that is achieved as a result of casting of one or more steel components, or hot forging or hot rolling of one or more semi-finished steel products,{'sub': 's', 'wherein the cooling rate during said the continuous cooling is initially sufficiently fast to prevent predominant formation of proeutectoid ferrite or pearlite, while subsequently at intermediate temperatures, the cooling rate is sufficiently slow to allow a transformation of austenite to mainly ausferrite during cooling, before the austenite being enriched in carbon during growth of acicular ferrite has reached a temperature below its continuously decreasing Mtemperature, thereby limiting the amount of martensite being formed if cooled to ambient temperature or lower, and'}wherein the annealing is able to complete the transformation of carbon ...

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Номер записи: 53
26-03-2020 дата публикации

Non-oriented electrical steel sheet and manufacturing method therefor

Номер: US20200095659A1
Автор: Hun Ju Lee, Jae-hoon Kim, Jong Uk Ryu, Yoon Sung Kim
Принадлежит: Posco Co Ltd

A non-oriented electrical steel sheet according to an embodiment of the present invention comprises Si: 2.0 to 3.5%, Al: 0.3 to 3.5%, Mn: 0.2 to 4.5%, Zn: 0.0005 to 0.02% in wt % and Fe and inevitable impurities as a balance amount.

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Номер записи: 54
02-06-2022 дата публикации

METHOD OF MANUFACTURING LOW IRON LOSS GRAIN ORIENTED ELECTRICAL STEEL SHEET

Номер: US20220170131A1
Автор: Suehiro Ryuichi, Takamiya Toshito, TERASHIMA Takashi, UESAKA Masanori, Watanabe Makoto
Принадлежит:

A method of manufacturing a grain oriented electrical steel sheet includes hot rolling a steel slab having a chemical composition including C: 0.002-0.10 mass %, Si: 2.5-5.0 mass %, Mn: 0.01-0.8 mass %, Al: 0.010-0.050 mass % and N: 0.003-0.020 mass % and the remainder being Fe and inevitable impurities to form a hot rolled sheet; subjecting the hot rolled sheet to one cold rolling or two or more cold rollings and interposing an intermediate annealing therebetween after hot band annealing or without hot band annealing to form a cold rolled sheet having a final thickness; subjecting the cold rolled sheet to a primary recrystallization annealing; applying an annealing separator to the surface of the steel sheet; and subjecting the sheet to a finish annealing and forming a tension coating. 1. A method of manufacturing a grain oriented electrical steel sheet comprising:hot rolling a steel slab having a chemical composition comprising C: 0.002-0.10 mass %, Si: 2.5-5.0 mass %, Mn: 0.01-0.8 mass %, Al: 0.010-0.050 mass % and N: 0.003-0.020 mass % and the remainder being Fe and inevitable impurities to form a hot rolled sheet;subjecting the hot rolled sheet to one cold rolling or two or more cold rollings and interposing an intermediate annealing therebetween after hot band annealing or without hot band annealing to form a cold rolled sheet having a final thickness;subjecting the cold rolled sheet to a primary recrystallization annealing;applying an annealing separator to the surface of the steel sheet; andsubjecting the sheet to a finish annealing and forming a tension coating,{'sub': max', 'min', 'max', 'min', 'max', 'α6.5', 'β2.5, 'claim-text': [{'br': None, 'i': 'L', '15.63×[β]+[]<44.06\u2003\u2003(1)'}, {'br': None, 'i': 'L', '[]≤20\u2003\u2003(2).'}], 'wherein the sheet is subjected to a temperature holding treatment at any temperature T of 250-600° C. for 1-10 seconds in a heating process of the primary recrystallization annealing and then heated from the temperature ...

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Номер записи: 55
29-04-2021 дата публикации

MOTOR

Номер: US20210125759A1
Автор: Senda Kunihiro, YOSHIZAKI Souichiro, Zaizen Yoshiaki
Принадлежит: JFE STEEL CORPORATION

A motor comprising a steel sheet used as a core material of the motor, wherein the steel sheet includes a composition including: by mass %, 0.010% or less of C; 2.0% to 7.0% of Si; 2.0% or less of Al; 0.05% to 1.0% of Mn; 0.005% or less of S; 0.005% or less of N; and balance Fe and inevitable impurities; the steel sheet includes a magnetic flux density changing area where a change ΔB in magnetic flux density to a change ΔH=50 A/m in a magnetic field, is equal to or higher than 0.50 T; a thickness of the steel sheet is 0.05 mm to 0.20 mm; and an eddy-current loss of the steel sheet, at 1000 Hz−1.0 T, is equal to or less than 0.55 of a total iron loss. 14-. (canceled)5. A motor comprising a steel sheet used as a core material of the motor , whereinthe steel sheet includes a composition including: by mass%, 0.010% or less of C; 2.0% to 7.0% of Si; 2.0% or less of Al; 0.05% to 1.0% of Mn; 0.005% or less of S; 0.005% or less of N; and balance Fe and inevitable impurities;the steel sheet includes a magnetic flux density changing area where a change AB in magnetic flux density to a change ΔH=50 A/m in a magnetic field, is equal to or higher than 0.50 T;a thickness of the steel sheet is 0.05 mm to 0.20 mm; andan eddy-current loss of the steel sheet, at 1000 Hz−1.0 T, is equal to or less than 0.55 of a total iron loss.6. The motor according to claim 5 , wherein the steel sheet further includes:by mass %, at least one element selected from 0.01% to 0.1% of P; 0.001% to 0.1% of Sn; 0.001% to 0.1% of Sb; and 0.001% to 0.01% of Mo.7. The motor according to claim 5 , wherein a difference between a concentration of Si at a surface of the steel sheet and a concentration of Si at a center portion of the steel sheet is 0.5% to 4.0% claim 5 , and a saturation magnetic flux density Bs of the steel sheet is equal to or greater than 2.0 T.8. The motor according to claim 6 , whereina difference between a concentration of Si at a surface of the steel sheet and a concentration of Si at a ...

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Номер записи: 56
18-04-2019 дата публикации

METHOD OF PRODUCING GRAIN-ORIENTED ELECTRICAL STEEL SHEET

Номер: US20190112685A1
Автор: EHASHI Yuiko, Hayakawa Yasuyuki, Imamura Takeshi, Takenaka Masanori
Принадлежит: JFE STEEL CORPORATION

A grain-oriented electrical steel sheet has magnetic properties improved over conventional grain-oriented electrical steel sheets. A method of producing a grain-oriented electrical steel sheet comprises: heating a steel slab at 1300° C. or less, the steel slab having a chemical composition containing C, Si, Mn, acid-soluble Al, S and/or Se, Sn and/or Sb, N, and a balance being Fe and inevitable impurities; subjecting the steel slab to hot rolling to obtain a hot rolled steel sheet; subjecting the hot rolled steel sheet to cold rolling once, or twice or more with intermediate annealing performed therebetween, to obtain a cold rolled steel sheet with a final sheet thickness; subjecting the cold rolled steel sheet to primary recrystallization annealing; applying an annealing separator to a surface of the cold rolled steel sheet after the primary recrystallization annealing; and then subjecting the cold rolled steel sheet to secondary recrystallization annealing. 18.-. (canceled)9. A method of producing a grain-oriented electrical steel sheet , the method comprising: C in an amount of 0.002% or more and 0.080% or less,', 'Si in an amount of 2.00% or more and 8.00% or less,', 'Mn in an amount of 0.02% or more and 0.50% or less,', 'acid-soluble Al in an amount of 0.003% or more and less than 0.010%,', 'S and/or Se in an amount of 0.005% or more and 0.010% or less in total,', 'Sn and/or Sb in an amount of 0.005% or more and 1.000% or less in total,', 'N in an amount of less than 0.006%, and', 'a balance being Fe and inevitable impurities;, 'heating a steel slab at 1300° C. or less, the steel slab having a chemical composition containing, in mass %,'}subjecting the steel slab to hot rolling to obtain a hot rolled steel sheet;subjecting the hot rolled steel sheet to cold rolling once, or twice or more with intermediate annealing performed therebetween, to obtain a cold rolled steel sheet with a final sheet thickness;subjecting the cold rolled steel sheet to primary ...

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Номер записи: 57
03-05-2018 дата публикации

GRAIN-ORIENTED ELECTRICAL STEEL SHEET, MANUFACTURING METHOD THEREFOR, AND METHOD FOR PREDICTING TRANSFORMER NOISE PROPERTY

Номер: US20180119244A1
Автор: Inoue Hirotaka, Okabe Seiji, Omura Takeshi
Принадлежит: JFE STEEL CORPORATION

Provided is a grain-oriented electrical steel sheet having an excellent noise property in an actual transformer. Magnetostrictive properties of the grain-oriented electrical steel sheet are set such that the number of acceleration/deceleration points that are present in the magnetostriction velocity level dλ/dt in one period of magnetostrictive vibration is 4 and the magnitude of velocity level change between adjacent velocity change points in an acceleration zone or deceleration zone of magnetostrictive vibration is 3.0×10secor less. 1. A grain-oriented electrical steel sheet comprising a forsterite film and an insulating coating at a surface thereof , wherein I: the number of acceleration/deceleration points that are present in a magnetostriction velocity level dλ/dt in one period of magnetostrictive vibration is 4,', {'sup': −4', '−1, 'II: the magnitude of velocity level change between adjacent magnetostriction velocity level change points in an acceleration zone or deceleration zone of magnetostrictive vibration is 3.0×10secor less,'}], 'magnetostrictive properties of the grain-oriented electrical steel sheet satisfy conditions I and II, shown below,'}a front/rear difference in total tension of the forsterite film and the insulating coating is less than 0.5 MPa, anda front/rear difference in tension of the forsterite film is 0.5 MPa or more.2. A method for manufacturing a grain-oriented electrical steel sheet claim 1 , for use in manufacturing the grain-oriented electrical steel sheet according to claim 1 , comprising:hot rolling a slab to obtain a hot rolled sheet;subjecting the hot rolled sheet to hot band annealing as necessary;subsequently subjecting the hot rolled sheet to cold rolling once, or twice or more with intermediate annealing in-between, to obtain a cold rolled sheet of final sheet thickness;subsequently subjecting the cold rolled sheet to decarburization annealing to obtain a decarburization annealed sheet;subsequently applying an annealing ...

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Номер записи: 58
21-05-2015 дата публикации

METHOD FOR MANUFACTURING NON-ORIENTED ELECTROMAGNETIC STEEL SHEET

Номер: US20150136278A1
Автор: Nakanishi Tadashi, Oda Yoshihiko, Toda Hiroaki, Zaizen Yoshiaki
Принадлежит:

Provided is a method for stably obtaining a non-oriented electrical steel sheet with high magnetic flux density and excellent productivity, at a low cost by casting in a continuous casting machine a slab having a chemical composition including by mass %, C: 0.0050% or less, Si: more than 3.0% and 5.0% or less, Mn: 0.10% or less, Al: 0.0010% or less, P: more than 0.040% and 0.2% or less, N: 0.0040% or less, S: 0.0003% or more and 0.0050% or less, Ca: 0.0015% or more, and total of at least one element selected from Sn and Sb: 0.01% or more and 0.1% or less, balance including Fe and incidental impurities, subjecting the slab to heating, then subjecting the slab to hot rolling to obtain a hot rolled steel sheet, then subjecting the steel sheet to hot band annealing, pickling, subsequent single cold rolling to obtain a final sheet thickness, then subjecting the steel sheet to final annealing, wherein in the hot band annealing, soaking temperature is 900° C. or higher and 1050° C. or lower, and cooling rate after soaking is 5° C./s or more. 1. A method for manufacturing a non-oriented electrical steel sheet , the method comprising: C: 0.0050% or less,', 'Si: more than 3.0% and 5.0% or less,', 'Mn: 0.10% or less,', 'Al: 0.0010% or less,', 'P: more than 0.040% and 0.2% or less,', 'N: 0.0040% or less,', 'S: 0.0003% or more and 0.0050% or less,', 'Ca: 0.0015% or more,', 'total of at least one element selected from Sn and Sb: 0.01% or more and 0.1% or less, and', 'the balance including Fe and incidental impurities,, 'casting in a continuous casting machine a slab having a chemical composition including by mass %'}subjecting the slab to heating,then subjecting the slab to hot rolling to obtain a hot rolled steel sheet,then subjecting the steel sheet to hot band annealing, pickling, subsequent single cold rolling to obtain a final sheet thickness,then subjecting the steel sheet to final annealing,wherein in the hot band annealing, soaking temperature is 900° C. or higher and ...

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Номер записи: 59
01-09-2022 дата публикации

600 MPA GRADE NON-ORIENTED ELECTRICAL STEEL SHEET AND MANUFACTURING METHOD THEREOF

Номер: US20220275472A1
Автор: Li Guobao, LI JUN, LIU Baojun, Shen Kanyi, Wang Bo, Zhang Feng
Принадлежит: BAOSHAN IRON & STEEL CO., LTD

Provided is a 600 MPa grade non-oriented electrical steel sheet with excellent magnetic properties, comprising the following chemical elements in mass percentage: 0 Подробнее

Номер записи: 60
23-04-2020 дата публикации

Grain-oriented electrical steel sheet

Номер: US20200123662A1
Автор: Hiroyasu Fujii, Seiki Takebayashi, Shinsuke TAKATANI, Shuichi Nakamura, Yoshiyuki Ushigami
Принадлежит: Nippon Steel Corp

A grain-oriented electrical steel sheet includes: a base steel sheet; an intermediate layer arranged in contact with the base steel sheet; and an insulation coating arranged in contact with the intermediate layer to be an outermost surface, in which the insulation coating has a crystalline phosphide-containing layer containing a crystalline phosphide in an area in contact with the intermediate layer when viewing a cross section whose cutting direction is parallel to a thickness direction.

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Номер записи: 61
01-09-2022 дата публикации

METHOD FOR PRODUCING NON-ORIENTED ELECTRICAL STEEL SHEET, METHOD FOR PRODUCING MOTOR CORE, AND MOTOR CORE

Номер: US20220278566A1
Автор: MIYAMOTO Yukino, Oda Yoshihiko, Okubo Tomoyuki, TANAKA Takaaki, Zaizen Yoshiaki
Принадлежит: JFE STEEL CORPORATION

In the production of a non-oriented electrical steel sheet by subjecting a steel slab having a certain component composition to a hot rolling, a hot-band annealing, a cold rolling and a finish annealing, the conditions of the finish annealing are controlled such that a yield stress of the steel sheet after the finish annealing is not less than 480 MPa. Also, when a motor core is produced by using the above steel sheet, there can be provided a non-oriented electrical steel sheet capable of producing a rotor core and a stator core as the same raw material where the stator core is subjected to a stress relief annealing at a soaking temperature of 780 to 950° C. in an atmosphere having a nitrogen content of not more than 30 vol % and a dew point of not higher than −20° C., while a motor core is produced with such a steel sheet. 4. The method for producing a non-oriented electrical steel sheet according to claim 1 , whereinthe steel slab contains at least one group selected from the following Groups A to D, in addition to the above component composition:Group A: one or two selected from Sn: 0.005 to 0.20 mass % and Sb: 0.005 to 0.20 mass %;Group B: one or more selected from Ca, Mg and REM by 0.0005 to 0.020 mass % in total;Group C: one or more selected from Cr, Co, Ni and Cu by 0.01 to 1.0 mass % in total of; andGroup D: one or two selected from Mo: 0.001 to 0.1 mass % and W: 0.001 to 0.1 mass %.5. (canceled)9. The motor core according to claim 8 , wherein {'br': None, '0.20≤(Zn/65)/(S/32)≤0.90\u2003\u2003(1).'}, 'the non-oriented electrical steel sheet has Zn and S contents satisfying the following equation (1)11. (canceled)13. The method for producing a non-oriented electrical steel sheet according to claim 2 , whereinthe steel slab contains at least one group selected from the following Groups A to D, in addition to the above component composition:Group A: one or two selected from Sn: 0.005 to 0.20 mass % and Sb: 0.005 to 0.20 mass %;Group B: one or more selected from ...

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Номер записи: 62
14-08-2014 дата публикации

Non-oriented electrical steel sheet and method of manufacturing non-oriented electrical steel sheet

Номер: US20140227127A1
Автор: Hisashi Mogi, Junichi TAKAOBUSHI, Kenichi Murakami, Takeaki Wakisaka, Takuya Matsumoto, Tatsuya Takase, Tomoji SHONO, Yoshiaki Natori
Принадлежит: Nippon Steel and Sumitomo Metal Corp

This oriented electrical steel sheet is a non-oriented electrical steel sheet consisting of, in mass %: C: not less than 0.0001% and not more than 0.0040%, Si: more than 3.0% and not more than 3.7%, sol.Al: not less than 0.3% and not more than 1.0%, Mn: not less than 0.5% and not more than 1.5%, Sn: not less than 0.005% and not more than 0.1%, Ti: not less than 0.0001% and not more than 0.0030%, S: not less than 0.0001% and not more than 0.0020%, N: not less than 0.0001% and not more than 0.003%, Ni: not less than 0.001% and not more than 0.2%, P: not less than 0.005% and not more than 0.05%, with a balance consisting of Fe and impurities, in which a resistivity ρ at room temperature ≧60 μΩcm, and saturation magnetic flux density Bs at room temperature ≧1.945 T are established, and the components contained satisfy 3.5≦Si+(⅔)×sol.Al+(⅕)×Mn≦4.25.

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Номер записи: 63
04-06-2015 дата публикации

METHOD OF PRODUCTION OF GRAIN-ORIENTED SILICON STEEL SHEET GRAIN ORIENTED ELECTRICAL STEEL SHEET AND USE THEREOF

Номер: US20150155085A1
Автор: Gabor Ban, VAN DE PUTTE Tom
Принадлежит: ARCELORMITTAL INVESTIGACION Y DESARROLLO, S.L.

The present invention is directed at a method of production gain oriented Fe—Si steel sheet presenting an induction value at 800 A/m above 1.870 Tesla and a core power loss lower than 1.3 W/kg at a specific magnetic induction of 1.7 Tesla (T). The steel chemical composition comprises, in weight percentage: 2.8≦Si≦4, 0.20≦Cu≦0.6, 0.05≦Mn≦0.4, 0.001≦Al≦0.04, 0.025≦C≦0.05, 0.005≦N≦0.02, 0.005≦Sn≦0.03, S≦0.015 and optionally Ti, Nb, V or B in a cumulated amount below 0.02, the following relationships being respected: Mn/Sn≦40, 2.0≦C/N≦5.0, Al/N≦1.20, and the balance being Fe and other inevitable impurities.

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Номер записи: 64
18-06-2015 дата публикации

MANUFACTURING METHOD OF GRAIN-ORIENTED ELECTRICAL STEEL SHEET

Номер: US20150170812A1
Автор: Murakami Kenichi, Takahashi Fumiaki, Ushigami Yoshiyuki
Принадлежит: NIPPON STEEL & SUMITOMO METAL CORPORATION

A slab having a desired composition containing Sn: 0.02% to 0.20% and P: 0.010% to 0.080% is used. A finishing temperature of hot rolling is 950° C. or lower, hot-rolled sheet annealing is performed at 800° C. to 1200° C., a cooling rate from 750° C. to 300° C. in the hot-rolled sheet annealing is 10° C./second to 300° C./second, and a reduction ratio of cold rolling is 85% or more. A nitridation treatment in which an N content of a decarburization-annealed steel sheet is increased is performed between beginning of decarburization annealing and occurrence of secondary recrystallization in finish annealing. 16-. (canceled)7. A manufacturing method of a grain-oriented electrical steel sheet comprising:performing hot rolling of a slab containing, in mass %, C: 0.025% to 0.075%, Si: 2.5% to 4.0%, Mn: 0.03% to 0.30%, acid-soluble Al: 0.010% to 0.060%, N: 0.0010% to 0.0130%, Sn: 0.02% to 0.20%, S: 0.0010% to 0.020%, and P: 0.010% to 0.080%, and a balance being composed of Fe and inevitable impurities to obtain a hot-rolled steel sheet;performing hot-rolled sheet annealing of the hot-rolled steel sheet to obtain an annealed steel sheet;performing cold rolling of the annealed steel sheet to obtain a cold-rolled steel sheet;performing decarburization annealing of the cold-rolled steel sheet to obtain a decarburization-annealed steel sheet in which primary recrystallization has been caused;finish annealing the decarburization-annealed steel sheet to make secondary recrystallization occur; andfurther performing a nitridation treatment in which an N content of the decarburization-annealed steel sheet is increased, between beginning of the decarburization annealing and occurrence of the secondary recrystallization in the finish annealing, in a gas atmosphere containing hydrogen, nitrogen and ammonia, whereina finishing temperature in the hot rolling is 950° C. or lower,the hot-rolled sheet annealing is performed at 800° C. to 1200° C.,a cooling rate from 750° C. to 300° C. in ...

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Номер записи: 65
18-06-2015 дата публикации

METHOD OF PRODUCING GRAIN-ORIENTED ELECTRICAL STEEL SHEET

Номер: US20150170813A1
Автор: Imamura Takeshi, Shingaki Yukihiro, Suehiro Ryuichi, Watanabe Makoto
Принадлежит: JFE STEEL CORPORATION

In a method of producing a grain-oriented electrical steel sheet by hot rolling a steel slab having a chemical composition including C: 0.001˜0.10 mass %, Si: 1.0˜5.0 mass %, Mn: 0.01˜0.5 mass %, S and/or Se: 0.01˜0.05 mass %, sol. Al: 0.003˜0.050 mass % and N: 0.0010˜0.020 mass %, subjecting to single cold rolling or two or more cold rollings including an intermediate annealing therebetween to a final thickness, performing primary recrystallization annealing, and thereafter applying an annealing separator to perform final annealing, a temperature range of 550° C. to 700° C. in a heating process of the primary recrystallization annealing is rapidly heated at an average heating rate of 40˜200° C./s, while any temperature zone of from 250° C. to 550° C. is kept at a heating rate of not more than 10° C./s for 1˜10 seconds, whereby the refining of secondary recrystallized grains is attained and grain-oriented electrical steel sheets are stably obtained with a low iron loss. 1. A method of producing a grain-oriented electrical steel sheet by hot rolling a steel slab having a chemical composition comprising C: 0.001˜0.10 mass % , Si: 1.0˜5.0 mass % , Mn: 0.01˜0.5 mass % , one or two selected from S and Se: 0.01˜0.05 mass % in total , sol. Al: 0.003˜0.050 mass % and N: 0.0010˜0.020 mass % and the remainder being Fe and inevitable impurities , subjecting to single cold rolling or two or more cold rollings including an intermediate annealing therebetween to a final thickness after or without a hot band annealing , performing primary recrystallization annealing , and thereafter applying an annealing separator to perform final annealing , characterized in that a temperature range of 550° C. to 700° C. in a heating process of the primary recrystallization annealing is rapidly heated at an average heating rate of 40˜200° C./s , while any temperature zone of from 250° C. to 550° C. is kept at a heating rate of not more than 10° C./s for 1˜10 seconds.2. The method of producing a ...

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Номер записи: 66
02-07-2015 дата публикации

METHOD FOR PRODUCING GRAIN-ORIENTED ELECTRICAL STEEL SHEET

Номер: US20150187473A1
Автор: Imamura Takeshi, Shingaki Yukihiro, Suehiro Ryuichi, Takamiya Toshito, Watanabe Makoto
Принадлежит:

A method for producing a grain-oriented electrical steel sheet includes hot rolling a raw steel material containing C: 0.002˜0.10 mass %, Si: 2.0˜8.0 mass % and Mn: 0.005˜1.0 mass % to obtain a hot rolled sheet, subjecting the sheet after or without hot band annealing to one or two or more stage cold rollings including an intermediate annealing to obtain a cold rolled sheet having a final sheet thickness, subjecting the rolled sheet to decarburization annealing and primary recrystallization annealing, applying an annealing separator to the sheet surface and subjecting to a final annealing, when rapid heating is performed at a rate of at least 50° C./s in a range of 200˜700° C. of the decarburization annealing, the rolled sheet is subjected to holding at any temperature of 250˜600° C. for 1˜10 seconds to produce a grain-oriented electrical steel sheet being low in the iron loss and small in the deviation of the iron loss value. 1. A method for producing a grain-oriented electrical steel sheet by comprising a series of steps of hot rolling a raw steel material comprising C: 0.002˜0.10 mass % , Si: 2.0˜8.0 mass % , Mn: 0.005˜1.0 mass % , Al: 0.010˜0.050 mass % and N: 0.003˜0.020 mass % or Al: 0.010˜0.050 mass % and N: 0.003˜0.020 mass % , Se: 0.003˜0.030 mass % and/or S: 0.002˜0.03 mass % and the remainder being Fe and inevitable impurities to obtain a hot rolled sheet , subjecting the hot rolled steel sheet after or without hot band annealing to one stage cold rolling or two or more stage cold rollings including an intermediate annealing therebetween to obtain a cold rolled sheet having a final sheet thickness , subjecting the cold rolled sheet to decarburization annealing combined with primary recrystallization annealing , applying an annealing separator to the steel sheet surface and then subjecting to a final annealing , wherein when rapid heating is performed at a rate of not less than 50° C./s in a range of 200˜700° C. of the decarburization annealing , the cold ...

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Номер записи: 67
09-07-2015 дата публикации

METHOD FOR PRODUCING GRAIN-ORIENTED ELECTRICAL STEEL SHEET

Номер: US20150194247A1
Автор: Hayakawa Yasuyuki, Imamura Takeshi, Shingaki Yukihiro, Suehiro Ryuichi, WAKISAKA Yuiko
Принадлежит:

In a method for producing a grain-oriented electrical steel sheet by hot rolling a steel slab having a chemical composition including C: 0.001˜0.10 mass %, Si: 1.0˜5.0 mass %, Mn: 0.01˜0.5 mass %, Al: less than 0.0100 mass %, each of S, Se, O and N: not more than 0.0050 mass % and the remainder being Fe and inevitable impurities, subjecting the resulting hot rolled sheet to a single cold rolling or two or more cold rollings sandwiching an intermediate annealing therebetween to a final thickness, subjecting to a primary recrystallization annealing, applying an annealing separator thereto and then subjecting to a finish annealing, a zone of 550˜700° C. in a heating process of the primary recrystallization annealing is rapidly heated at an average heating rate of 40˜200° C./s, while any temperature zone of 250˜550° C. is kept at a heating rate of not more than 10° C./s for 1˜10 seconds, whereby secondary recrystallized grains are refined to obtain a grain-oriented electrical steel sheet stably realizing a low iron loss. 1. A method for producing a grain-oriented electrical steel sheet by hot rolling a steel slab having a chemical composition comprising C: 0.001˜0.10 mass % , Si: 1.0˜5.0 mass % , Mn: 0.01˜0.5 mass % , Al: less than 0.0100 mass % , each of S , Se , O and N: not more than 0.0050 mass % and the remainder being Fe and inevitable impurities , subjecting the resulting hot rolled sheet to a single cold rolling or two or more cold rollings sandwiching an intermediate annealing therebetween to a final thickness after or without annealing , subjecting the resulting cold rolled sheet to a primary recrystallization annealing , applying an annealing separator thereto and then subjecting to a finish annealing , characterized in that a zone of 550˜700° C. in a heating process of the primary recrystallization annealing is rapidly heated at an average heating rate of 40˜200° C./s , while any temperature zone of 250˜550° C. is kept at a heating rate of not more than 10° ...

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Номер записи: 68
06-07-2017 дата публикации

NON-ORIENTED MAGNETIC STEEL SHEET AND METHOD OF MANUFACTURING THE SAME

Номер: US20170194082A1
Автор: HORI Hiroki, Matsumoto Takuya, Murakami Kenichi, Natori Yoshiaki, WAKISAKA Takeaki
Принадлежит: NIPPON STEEL & SUMITOMO METAL CORPORATION

A non-oriented magnetic steel sheet includes a specific chemical composition represented by, in mass %: Si: 3.0% to 3.6%; Al: 0.50% to 1.25%; Mn: 0.5% to 1.5%; Sb or Sn or both of them: [Sb]+[Sn]/2 is 0.0025% to 0.05% where [Sb] denotes an Sb content and [Sn] denotes an Sn content; P: 0.010% to 0.150%; Ni: 0.010% to 0.200%; C: 0.0010% to 0.0040%; and others. The thickness of the non-oriented magnetic steel sheet is 0.15 mm to 0.30 mm. the non-oriented magnetic steel sheet includes magnetic properties represented by, where t denotes a thickness (mm) of the non-oriented magnetic steel sheet: a magnetic flux density B50: “0.2×t+1.52” T or more; a magnetic flux density difference ΔB50: 0.08 T or less; core loss W10/50: 0.95 W/kg or less; and core loss W10/400: “20×t+7.5” W/kg or less. A ratio of a number of intergranular carbides precipitated in grains relative to a sum of the number of the intergranular carbides and a number of grain boundary carbides precipitated on grain boundaries is 0.50 or less. 1. A non-oriented magnetic steel sheet , comprising:a chemical composition represented by, in mass %:Si: 3.0% to 3.6%;Al: 0.50% to 1.25%;Mn: 0.5% to 1.5%;Sb or Sn or both of them: [Sb]+[Sn]/2 is 0.0025% to 0.05% where [Sb] denotes an Sb content and [Sn] denotes an Sn content;P: 0.010% to 0.150%;Ni: 0.010% to 0.200%;C: 0.0010% to 0.0040%;N: 0.0030% or less;S: 0.0020% or less;Ti: 0.0030% or less;Cu: 0.0500% or less;Cr: 0.0500% or less;Mo: 0.0500% or less;Bi: 0.0050% or less;Pb: 0.0050% or less;V: 0.0050% or less;B: 0.0050% or less; andbalance: Fe and impurities, andmagnetic properties represented by, where t denotes a thickness (mm) of the non-oriented magnetic steel sheet:a magnetic flux density B50: “0.2×t+1.52” T or more;a magnetic flux density difference ΔB50: 0.08 T or less;core loss W10/50: 0.95 W/kg or less; andcore loss W10/400: “20×t+7.5” W/kg or less,whereinthe thickness is 0.15 mm to 0.30 mm, anda ratio of a number of intergranular carbides precipitated in grains ...

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Номер записи: 69
25-09-2014 дата публикации

METHOD FOR PRODUCING A SOFT MAGNETIC ALLOY STRIP AND RESULTANT STRIP

Номер: US20140283953A1
Автор: BATONNET Rémy, Waeckerle Thierry
Принадлежит: APERAM

Method for producing a soft magnetic alloy strip suited to be mechanically cut, having a chemical composition comprising, by weight: 2. The method according to claim 1 , wherein the annealing temperature is 700-930° C.3. Method according to claim 1 , the speed of the passage of the strip is such that the strip remains at the annealing temperature for less than 10 min.4. The method according to claim 1 , characterised in that the cooling speed of the band upon exiting the treatment furnace is greater than 1000° C./h.5. The method according to claim 1 , wherein the speed of the passage of the strip through the furnace and the annealing temperature are adjusted to adjust the mechanical resistance of the strip.9. A method for producing a magnetic component comprising:{'claim-ref': {'@idref': 'CLM-00007', 'claim 7'}, 'mechanically cutting a plurality of parts in a strip according to , and'}assembling the parts are assembled to form a magnetic component.10. The method according to claim 9 , characterised in that the magnetic component is further subjected to static annealing to optimise its magnetic properties.11. The method according to claim 10 , characterised in that the static annealing to optimise the magnetic properties occurs at a temperature of 820-880° C. for a target period of 1-5 h.12. The method according to claim 9 , characterised in that the magnetic component is a magnetic yoke. This invention concerns the production of a soft magnetic alloy strip of the iron-cobalt type.Numerous electrotechnical devices include magnetic parts, in particular magnetic yokes made of soft magnetic alloys. This is the case, in particular, with on-board electrical generators in vehicles, in particular in the field of aeronautics, railways, or automobiles. Generally, the alloys used are iron-cobalt alloys, in particular alloys including approximately 50% by weight cobalt. These alloys have the benefit of very high saturation induction, elevated permeability under inductions ...

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Номер записи: 70
20-06-2019 дата публикации

NON-ORIENTED ELECTRICAL STEEL SHEET AND METHOD FOR MANUFACTURING NON-ORIENTED ELECTRICAL STEEL SHEET

Номер: US20190189318A1
Автор: Omura Takeshi, Senda Kunihiro, UESAKA Masanori
Принадлежит: JFE STEEL CORPORATION

A non-oriented electrical steel sheet has low iron loss even under inverter excitation and can be suitably used as the iron core of a motor. The non-oriented electrical steel sheet has a specific chemical composition and an average grain size r of 40 μm to 120 μm. An area ratio R of a total area of grains having a grain size of ⅙ or less of the thickness of the steel sheet to a cross-sectional area of the steel sheet is 2% or greater, and the average grain size r (μm) and the area ratio R (%) satisfy a condition represented by Expression (1), R>−2.4×r+200 (1). 1. A non-oriented electrical steel sheet comprising: C: 0.005% or less,', 'Si: 4.5% or less,', 'Mn: 0.02% to 2.0%,', 'Sol.Al: 2.0% or less,', 'P: 0.2% or less,', 'Ti: 0.007% or less,', 'S: 0.005% or less,', 'one or both of As and Pb: total of 0.0005% to 0.005%, and', 'the balance consisting of Fe and inevitable impurities;, 'a chemical composition containing, in mass %,'} {'br': None, 'i': 'r+', 'R>−2.4×200 \u2003\u2003(1).'}, 'wherein an average grain size r is 40 μm to 120 μm, and wherein an area ratio R of a total area of grains having a grain size of ⅙ or less of a thickness of the steel sheet to a cross-sectional area of the steel sheet is 2% or greater, and the average grain size r μm and the area ratio R % satisfy a condition represented by Expression (1),'}2. The non-oriented electrical steel sheet of claim 1 , wherein the chemical composition further contains claim 1 , in mass % claim 1 , one or both of Sn: 0.01% to 0.2% and Sb: 0.01% to 0.2%.3. The non-oriented electrical steel sheet of claim 1 , wherein the chemical composition further contains claim 1 , in mass % claim 1 , one or more ofREM: 0.0005% to 0.005%,Mg: 0.0005% to 0.005%, andCa: 0.0005% to 0.005%.4. The non-oriented electrical steel sheet of claim 1 , wherein the thickness of the steel sheet is 0.35 mm or less.5. The non-oriented electrical steel sheet of claim 1 , wherein a rate of increase in iron loss W% calculated as 100(W−W)/Wis 100% ...

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Номер записи: 71
18-06-2020 дата публикации

Grain-oriented electrical steel sheet

Номер: US20200190644A1
Автор: Kenichi Murakami, Shinsuke TAKATANI, Shohji Nagano, Shunsuke Okumura, Yoshiyuki Ushigami
Принадлежит: Nippon Steel Corp

A grain-oriented electrical steel sheet includes a steel sheet and an amorphous oxide layer that is formed on the steel sheet, in which the steel sheet includes, as a chemical composition, by mass %, C: 0.085% or less, Si: 0.80% to 7.00%, Mn: 1.50% or less, acid-soluble Al: 0.065% or less, S: 0.013% or less, Cu: 0% to 0.80%, N: 0% to 0.012%, P: 0% to 0.50%, Ni: 0% to 1.00%, Sn: 0% to 0.30%, Sb: 0% to 0.30%, and a remainder of Fe and impurities, and a NSIC value of a surface is 4.0% or more, the NSIC value being obtained by measuring an image clearness of the surface using an image clearness measuring device.

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Номер записи: 72
19-07-2018 дата публикации

GRAIN-ORIENTED ELECTRICAL STEEL SHEET AND METHOD FOR PRODUCING THE SAME

Номер: US20180202018A1
Автор: Imamura Takeshi, Takenaka Masanori
Принадлежит: JFE STEEL CORPORATION

In the production of a grain-oriented electrical steel sheet by hot rolling a slab containing Si: 2.0-8.0 mass % and no inhibitor-forming ingredients, cold rolling, subjecting to a decarburization annealing, applying an annealing separator composed mainly of MgO and containing a Ti compound(s) and subjecting to a finish annealing, an atmosphere in the heating process of the decarburization annealing is rendered into a dry atmosphere having a dew point of not higher than 0° C. and a Ti amount (Ti(a)) and a N amount (N(a)) contained in an iron matrix after the removal of a forsterite coating and a Ti amount (Ti(b)) and a N amount (N(b)) contained in the steel sheet having a forsterite coating are made to satisfy relationships as N(b)≤0.0050 mass %, N(b)/N(a)≥4, and Ti(b)/Ti(a)≥4. 1. A grain-oriented electrical steel sheet , characterized in that an iron matrix after a removal of a forsterite coating has a chemical composition comprising C: not more than 0.0050 mass % , Si: 2.0-8.0 mass % , Mn: 0.005-1.0 mass % , and the remainder being Fe and inevitable impurities and N(b)≤0.0050 mass % , N(b)/N(a)≥4 , and Ti(b)/Ti(a)≥4 are satisfied when a Ti amount (mass %) and a N amount contained in the iron matrix after the removal of the forsterite coating are Ti(a) and N(a) and a Ti amount (mass %) and a N amount (mass %) contained in the steel sheet having a forsterite coating are Ti(b) and N (b) , respectively.2. The grain-oriented electrical steel sheet according to claim 1 , wherein Ti (a) is not more than 0.0025 mass % and N(a) is not more than 0.0010 mass %.3. The grain-oriented electrical steel sheet according to claim 1 , wherein the iron matrix after the removal of a forsterite coating contains one or more selected from Ni: 0.010-1.50 mass % claim 1 , Cr: 0.01-0.50 mass % claim 1 , Cu: 0.01-0.50 mass % claim 1 , Bi: 0.005-0.50 mass % claim 1 , Sb: 0.010-0.200 mass % claim 1 , Sn: 0.010-0.200 mass % claim 1 , Mo: 0.010-0.200 mass % claim 1 , and P: 0.010-0.200 mass % in ...

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Номер записи: 73
28-07-2016 дата публикации

COPPER FERROUS ALLOY FOR SHIELDING ELECTROMAGNETIC WAVES AND METHOD FOR PREPARING THE SAME

Номер: US20160215357A1
Автор: SHIN Joongpil, SHIN Jungouk
Принадлежит:

A rolled foil formed of the Fe—Cu alloy according to an embodiment of the present invention is manufactured to consist of 3 to 30 wt % iron and 70 to 97 wt % copper having a thickness of 100 μm to 10 μm, by casting a molten metal of a Fe—Cu parent alloy and a metal copper into a slab, heat-treating the slab, and roll-milling the heat-treated slab by using a multi-pass rolling mill with the total reduction ratio of 90% or higher. In this regard, the Fe—Cu alloy rolled foil according to the present invention provides an effect of shielding electromagnetic waves of 80 dB or more within high frequencies ranging between 1 GHz to 1.5 GHz. 1. A method for preparing a copper ferrous (Fe—Cu) alloy (CFA) rolled foil for shielding electromagnetic waves , the method comprising:a) a molten metal forming process forming a molten metal by melting a Fe—Cu parent alloy and copper (Cu) comprising iron at an amount in a range of about 5 wt % to about 20 wt % and copper at an amount in a range of about 80 wt % to about 95 wt %;b) a molten metal coating process adding at least one selected from anhydrous borax and cryolite on a surface of the molten metal;c) a casting process casting the molten metal into a Fe—Cu alloy slab;d) a rough roll-milling process preparing a first panel by rough roll-milling comprising hot-rolling the slab, face-milling the hot-rolled slab, and cool-rolling the resultant;e) a heat-treating process preparing a second panel by heat-treating the first panel to remove a remaining stress; andf) a roll-milling process roll-milling the second panel at the total reducing ratio of about 90% or higher by repeating the roll-milling to prepare a thin film having a thickness in a range of about 100 μm to about 10 μm.2. The method according to claim 1 , wherein a weight ratio of iron and copper in the Fe—Cu parent alloy used in a) the molten metal forming process is about 50:50 or about 40:60.3. The method according to any one of claim 2 , wherein e) the heat-treating ...

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Номер записи: 74
02-07-2020 дата публикации

GRAIN-ORIENTED ELECTRICAL STEEL SHEET AND METHOD FOR PRODUCING SAME

Номер: US20200208235A1
Автор: Ushigami Yoshiyuki, Yamamoto Shinji
Принадлежит: NIPPON STEEL CORPORATION

A grain-oriented electrical steel sheet includes: a base steel sheet; an intermediate layer arranged in contact with the base steel sheet; and an insulation coating arranged in contact with the intermediate layer to be an outermost surface, in which a Cr content of the insulation coating is 0.1 at % or more on average, and when viewing a cross section whose cutting direction is parallel to a thickness direction, the insulation coating has a compound layer containing a crystalline phosphide in an area in contact with the intermediate layer. 16-. (canceled)7. A grain-oriented electrical steel sheet comprising:a base steel sheet;an intermediate layer arranged in contact with the base steel sheet; andan insulation coating arranged in contact with the intermediate layer to be an outermost surface,wherein a Cr content of the insulation coating is 0.1 at % or more on average,the insulation coating has a compound layer containing a crystalline phosphide in an area in contact with the intermediate layer when viewing a cross section whose cutting direction is parallel to a thickness direction,{'sub': 3', '2', '2', '2', '2', '7, 'at least one selected from group consisting of (Fe,Cr)P, (Fe,Cr)P, (Fe,Cr)P, (Fe,Cr)P, and (Fe,Cr)POis contained as the crystalline phosphide, and'}an average thickness of the compound layer is 0.5 μm or less and ⅓ or less of an average thickness of the insulation coating when viewing the cross section.8. The grain-oriented electrical steel sheet according to claim 7 ,wherein when viewing the cross section, the insulation coating has a Cr-depletion layer in an area in contact with the compound layer,an average Cr content of the Cr-depletion layer in units of atomic percentage is less than 80% of the Cr content of the insulation coating, andan average thickness of the Cr-depletion layer is 0.5 μm or less and ⅓ or less of the average thickness of the insulation coating.9. The grain-oriented electrical steel sheet according to claim 7 ,wherein an average ...

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Номер записи: 75
23-10-2014 дата публикации

PROCESS FOR THE PRODUCTION OF GRAIN-ORIENTED MAGNETIC SHEET WITH A HIGH LEVEL OF COLD REDUCTION

Номер: US20140311629A1
Автор: "Cicale Stefano", Abbruzzese Giuseppe, Fortunati Stefano
Принадлежит:

Process for the production of grain-oriented Fe—Si sheets having excellent magnetic characteristics to be used for construction of electrical devices wherein the thickness of hot rolled strip (_>3.5 mm) and the total cold deformation rate (90-98%) are higher than known processes, and wherein hot rolled strip annealing before cold rolling is not scheduled. 2. The process according to claim 1 , in which the hot rolled sheet is in line and in continuous subjected to the following treatment: one way cold rolling by one or more rolling stands in sequence interposing between the rolling cylinders as a lubricant an emulsion of oil in water with a concentration in the range 1-8% claim 1 , annealing claim 1 , cooling claim 1 , and optionally subsequent cold rolling by use of one or more cold rolling stands.3. The process according to claim 1 , in which the strip after the first cold rolling is annealed and then cooled from a starting temperature of between 900 and 800° C. at a cooling rate above 25° C./s in a temperature range of 900-300° C.4. The process according to claim 1 , in which the strip claim 1 , after cold rolling to final thickness of between 0.15 and 0.50 mm claim 1 , is continuously annealed to develop primary recrystallization annealing in one or more controlled atmosphere annealing rooms in order to reduce the average carbon content of the strip to less than 0.004% claim 1 , to increase the average oxygen content of the strip to average values of between 0.020 and 0.100% claim 1 , and optionally to increase the average nitrogen content of the strip up to a maximum of 0.050%.5. The process according to claim 1 , in which the overall rate of reduction of hot rolling (T>800° C.) applied to the solidified product in the form of slabs or ingots during the hot rolling is lower than the overall rate of cold rolling (T<300° C.) applied to the strip with subsequent cold rolling up to final thickness.6. The process according to claim 1 , in which the first cold rolling ...

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Номер записи: 76
11-08-2016 дата публикации

GRAIN-ORIENTED ELECTRICAL STEEL SHEET AND METHOD FOR MANUFACTURING SAME (AS AMENDED)

Номер: US20160230240A1
Автор: Okubo Tomoyuki, Senda Kunihiro, Takajo Shigehiro
Принадлежит: JFE STEEL CORPORATION

Provided is a grain-oriented electrical steel sheet including: a forsterite base film formed on a surface of the steel sheet; and an insulating tension coating formed on the base film, in which when Ti intensity FX(Ti), Al intensity FX(Al), and Fe intensity FX(Fe) obtained through quantitative analysis by performing fluorescent X-ray analysis on the surface of the steel sheet satisfy FX(Ti)/FX(Al)≧0.15 and FX(Ti)/FX(Fe)≧0.004, the frequency of crystal boundaries of secondary recrystallized grains in the direction orthogonal to the rolling direction is 20 grain boundaries/100 mm or less, the mean thickness of the forsterite base film t(Fo) and the thickness of the insulating tension coating t(C) satisfies t(Fo)/t(C)≧0.3, and magnetic domain refining treatment is performed by irradiation with a laser beam, plasma flame, or electron beam, a sufficient iron loss reducing effect is achieved in a range where coating detachment does not occur. 18-. (canceled)9. A grain-oriented electrical steel sheet before or after subjection to non-heat resistant magnetic domain refining treatment , the grain-oriented electrical steel sheet comprising:a forsterite base film formed on a surface of the steel sheet; andan insulating tension coating formed on the base film, wherein [{'br': None, 'i': FX', 'FX, '(Ti)/(Al)≧0.15 \u2003\u2003(1)'}, {'br': None, 'i': FX', 'FX, '(Ti)/(Fe)≧0.004 \u2003\u2003(2)'}], 'when contents (mass %) of Ti, Al, and Fe in the forsterite base film, obtained through quantitative analysis by applying correction with the ZAF method to results of fluorescent X-ray analysis on the surface of the steel sheet after removing the insulating tension coating are each specified as FX(Ti), FX(Al), and FX(Fe), the following formulas (1) and (2) are satisfied,'}the frequency of crystal boundaries of secondary recrystallized grains in the direction orthogonal to the rolling direction is 20 grain boundaries/100 mm or less, and {'br': None, 'i': t', 't, '(Fo)/(C)≧0.3 \u2003\u2003 ...

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Номер записи: 77
09-08-2018 дата публикации

FeCo alloy, FeSi alloy or Fe sheet or strip and production method thereof, magnetic transformer core produced from said sheet or strip, and transformer comprising same

Номер: US20180223401A1
Автор: BATONNET Rémy, Baudin Thierry, HELBERT Anne-Laure, Hubert Olivier, Waeckerle Thierry
Принадлежит:

Sheet or strip of cold-rolled and annealed ferrous alloy (1), characterized in that its composition is, in weight percentages: traces≤Co≤40%; if Co≥35%, traces≤Si≤1.0%; if traces≤Co<35%, traces≤Si≤3.5%; if traces≤Co<35%, Si+0.6% Al≤4.5−0.1% Co; traces≤Cr<10%; traces≤V+W+Mo+Ni≤4%; traces≤Mn≤4%; traces Al≤3%; traces≤S≤0.005%; traces≤P≤0.007%; traces≤Ni≤3%; traces≤Cu≤0.5%; traces≤Nb≤0.1%; traces≤Zr≤0.1%; traces≤Ti≤0.2%; traces≤N≤0.01%; traces≤Ca≤0.01%; traces≤Mg≤0.01%; traces≤Ta≤0.01%; traces≤B≤0.005%; traces≤O≤0.01%; the remainder being iron and impurities resulting from the preparation, in that, for an induction of 1.8 T, the maximum difference (Max Δλ) between the magnetostriction deformation amplitudes λ, measured parallel to the magnetic field (Ha) applied (λ/H) and perpendicular to the magnetic field (Ha) applied (λH) on three rectangular samples (2, 3, 4) of the said sheet or strip whose long sides are respectively parallel to the direction of rolling (DL) of the said sheet or strip, parallel to the transverse direction (DT) of the said sheet or strip, and parallel to the direction forming an angle of 45° with the said rolling direction (DL) and the said transverse direction (DT), being at most 25 ppm, and in that its recrystallization rate is 80 to 100%. 112- (canceled)13. Sheet or strip of cold rolled and annealed ferrous alloy , wherein its composition consists of , in weight percentages:traces≤C≤0.2%;traces≤Co≤40%;if Co≥35%, traces ≤Si ≤1.0%;if traces≤Co<35%, traces≤Si≤3.5%;if traces≤Co<35%, Si+0.6% Al≤4.5−0.1% Co;traces≤Cr≤10%;traces≤V+W+Mo+Ni≤4%;traces≤Mn≤4%;traces≤Al≤3%;traces≤S≤0.005%;traces≤P≤0.007%;traces≤Ni≤3%;traces≤Cu≤0.5%;traces≤Nb≤0.1%;traces≤Zr≤0.1%;traces≤Ti≤0.2%;traces≤N≤0.01%;traces≤Ca≤0.01%;traces≤Mg≤0.01%;traces≤Ta≤0.01%;traces≤B≤0.005%;traces≤O≤0.01%;{'sup': '⊥', 'the remainder being iron and impurities resulting from the preparation, in that, for an induction of 1.8 T, the maximum difference (Max Δλ) between the magnetostriction ...

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Номер записи: 78
17-08-2017 дата публикации

PRE-COATING AGENT COMPOSITION FOR GRAIN-ORIENTED ELECTRICAL STEEL SHEET, GRAIN-ORIENTED ELECTRICAL STEEL SHEET COMPRISING SAME, AND MANUFACTURING METHOD THEREFOR

Номер: US20170233871A1
Автор: HAN Min Soo, PARK Soon-Bok, SHON Bungkwan
Принадлежит:

A pre-coating agent composition for a grain-oriednted electrical steel sheet, a grain-oriednted electrical steel sheet including the same, and a manufacturing method thereof are provided. Particularly, a pre-coating agent composition for a grain-oriednted electrical steel sheet including an acid containing boron (B); and a solvent, a grain-oriednted electrical steel sheet including the same, and a manufacturing method thereof are provided. 138-. (canceled)39. A pre-coating agent composition for a grain-oriednted electrical steel sheet comprising: acid containing boron (B); and solvent ,wherein the acid containing boron (B) is at least one selected from the group consisting of borinic acid, boronic acid, boric acid and a combination thereof, andthe pre-coating agent composition comprises 20 to 40 parts by weight of the silicate compound, 5 to 15 parts by weight of the acid containing boron (B), and 300 to 500 parts by weight of the solvent, based on 100 parts by weight of the metal dihydrogen phosphates.40. The pre-coating agent composition of claim 39 , further comprising:metal dihydrogen phosphates; anda silicate compound.41. The pre-coating agent composition of claim 39 , wherein:the metal dihydrogen phosphates are{'sub': 2', '4', '3', '2', '4', '2, 'one or more selected from the group consisting of aluminum dihydrogen phosphate (Al(HPO)), magnesium dihydrogen phosphate (Mg((HPO)) and a combination thereof.'}42. The pre-coating agent composition of claim 41 , wherein:{'sub': 2', '4', '3', '2', '4', '2, 'the metal dihydrogen phosphates include aluminum dihydrogen phosphate (Al(HPO)) and magnesium dihydrogen phosphate (Mg((HPO)), and'}{'sub': 2', '4', '3, 'aluminum dihydrogen phosphate (Al(HPO)) is included at 20 to 80 wt %, based on total 100 wt % of the metal dihydrogen phosphates.'}43. The pre-coating agent composition of claim 41 , wherein:the silicate compound isone or more selected from the group consisting of silica dispersed in a dispersion medium in a ...

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Номер записи: 79
06-11-2014 дата публикации

ELECTRICAL STEEL PROCESSING WITHOUT A POST COLD-ROLLING INTERMEDIATE ANNEAL

Номер: US20140326364A1
Автор: Gallo Eric E., Hill Theodore E.
Принадлежит:

Embodiments of the present invention comprise; annealing steel sheets (e.g., hot rolled steel sheets or thin cast strip steel); cold rolling the sheets in one or more cold rolling passes (e.g., with an annealing steep between multiple cold rolling passes); and performing one or more of tension leveling, a rough rolling, or a coating process on the sheets after cold rolling, without an intermediate annealing step between the final cold rolling pass and the tension leveling, the rough rolling, or the coating process. In order to achieve the desired properties for the steel sheet, stamping and final annealing may be performed. The new process provides an electrical steel with the similar, same, or better magnetic properties than an electrical steel manufactured using the traditional processing that utilizes an intermediate annealing step after cold rolling and before the stamping and final annealing. 1. A method of manufacturing an electrical steel , comprising:hot rolling steel into a steel sheet in one or more hot rolling passes;annealing the steel sheet after hot rolling;cold rolling the steel sheet in one or more cold rolling passes after the annealing to a final thickness less than 0.031 inches; andwhereby final magnetic properties are achieved in the steel sheet after the steel sheet is stamped and final annealed without an intermediate annealing process after a final cold rolling pass within the one or more cold rolling passes, and before the stamping and the final annealing.2. The method of claim 1 , further comprising:preforming one or more of a tension leveling, a coating, or a rough rolling process on the steel sheet after the cold rolling.3. The method of claim 1 , wherein the composition of the electrical steel comprises:silicon (Si) in a range of 0.15-3.5% weight;manganese (Mn) in a range of 0.005-1% weight;aluminum (Al) less than or equal to 1% weight;carbon (C) less than or equal to 0.04% weight;antimony (Sb) or tin (Sn) less than or equal to 0.1% ...

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Номер записи: 80
23-08-2018 дата публикации

Method for producing a grain-oriented electrical steel strip and grain-oriented electrical steel strip

Номер: US20180237876A1
Автор: Carsten Schepers, Christian Hecht, Ludger Lahn
Принадлежит: THYSSENKRUPP ELECTRICAL STEEL GMBH

A method is used to produce a grain-oriented electrical steel strip having optimized magnetic properties. The method may utilize a steel comprising in percent by weight 2.0-4.0% Si, 0.010-0.100% C, at most 0.065% Al, at most 0.02% N, and optionally further constituents, the balance being iron and unavoidable impurities. The steel may be processed to give a cold strip, which may then be subjected to oxidation/primary recrystallization annealing. The resultant cold strip may have an oxide layer to which an annealing separator layer is applied. In a subsequent high-temperature anneal, a forsterite layer forms therefrom, and an insulation layer may be applied thereto prior to a final anneal. After the oxidation/primary recrystallization anneal, a spectrum of the oxide layer obtained is determined by way of FTIR, and an area (Fe2SiO4) is determined for a peak representing Fe2SiO4 molecules present in the oxide layer and is at 980 cm−1, and an area (αSiO2) for a peak representing αSiO2 molecules present in the oxide layer and is at 1250 cm−1. Then the composition of the steel, parameters for the cold rolling, parameters for the oxidation/primary recrystallization anneal, or parameters for a hot strip anneal are adjusted such that 0.5×area (Fe2SiO4)≤area (αSiO2)≤2×area (Fe2SiO4).

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Номер записи: 81
26-08-2021 дата публикации

GRAIN-ORIENTED ELECTRICAL STEEL SHEET AND MANUFACTURING METHOD THEREFOR

Номер: US20210265087A1
Автор: Han Kyu-Seok, JOO Hyung Don, KO Hyun-Seok, Lim Jae-Soo, PARK Hyung-Ki, SEO Jin-Wook
Принадлежит:

Disclosed are an oriented electrical steel sheet and a manufacturing method thereof. An exemplary embodiment of the present invention provides a method of manufacturing an oriented electrical steel sheet, including: providing a slab including Si at 1.0 to 4.0 wt %, C at 0.1 to 0.4 wt %, and the remaining portion including Fe and other inevitably incorporated impurities; reheating the slab; producing a hot rolled steel sheet by hot rolling the slab; performing annealing of the hot rolled steel sheet; cold rolling the annealed hot rolled steel sheet; decarburizing and primary annealing the cold rolled steel sheet; cold rolling the decarburized and annealed steel sheet; and secondary annealing the cold rolled steel sheet. 1. A method of manufacturing an oriented electrical steel sheet , comprising:providing a slab including Si at 1.0 to 4.0 wt %, Cat 0.1 to 0.4 wt %, and the remaining portion including Fe and other inevitably incorporated impurities;heating the slab;producing a hot rolled steel sheet by hot rolling the slab;performing annealing of the hot rolled steel sheet;cold rolling the annealed hot rolled steel sheet;decarburizing and primary annealing the cold rolled steel sheet;cold rolling the decarburized and annealed steel sheet; andsecondary annealing the cold rolled steel sheet.2. The method of manufacturing the oriented electrical steel sheet of claim 1 , whereinthe secondary annealing is continuously performed after the cold rolling.3. The method of manufacturing the oriented electrical steel sheet of claim 2 , whereinthe decarburizing and primary annealing of the cold rolled steel sheet and the cold rolling of the decarburized and annealed steel sheet are repeated two or more times.4. The method of manufacturing the oriented electrical steel sheet of claim 3 , whereina size of a grain of a surface of the decarburized and annealed steel sheet is in a range of about 150 μm to about 250 μm.5. The method of manufacturing the oriented electrical steel sheet ...

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Номер записи: 82
10-09-2015 дата публикации

Manufacturing Method of Common Grain-Oriented Silicon Steel with High Magnetic Induction

Номер: US20150255211A1
Автор: CHU Shuangjie, HU QI, Hu Zhuochao, Huang Jie, Li Guobao, Shen Kanyi, Sun Yezhong, Yang Yongjie, ZHANG Huabing, Zhang Peili, ZHAO BIN
Принадлежит: BAOSHAN IRON & STEEL CO., LTD.

A manufacturing method of oriented silicon steel with magnetic induction B8 of not less than 1.88 T, comprising the following steps: 1) smelting and continuous casting to obtain a slab, wherein the content of N is controlled at 0.002-0.014 wt % in the smelting stage; 2) hot-rolling; 3) cold-rolling; 4) decarbonizing and annealing; 5) nitriding treatment, wherein infiltrated nitrogen content [N]is controlled to satisfy the formula: 328−0.14a−0.85b−2.33c≦[N]≦362−0.16a−0.94b−2.57c, wherein a is the content of Als in the smelting step, with the unit of ppm; b is the content of N element, with the unit of ppm; and c is primary grains size, with the unit of μm; 6) coating a steel's surfaces with a magnesium oxide layer and annealing; and 7) applying an insulating coating. 1. A manufacturing method of common oriented silicon steel having high magnetic induction , comprising the following steps:(1) smelting and continuous casting to obtain a slab, wherein the content of N is controlled in a range of 0.002-0.014 wt % in the smelting stage;(2) hot-rolling, wherein a heating temperature is 1090-1200° C.;(3) cold-rolling, wherein a primary aging-free rolling is performed;(4) decarbonizing and annealing;{'sub': D', 'D, '(5) nitriding treatment, wherein infiltrated nitrogen content [N]satisfies the following formula: 328−0.14a−0.85b−2.33c<[N]<362−0.16a−0.94b−2.57c, wherein a is the content of Als in the smelting step, with a unit of ppm; b is the content of N element in the smelting step, with a unit of ppm; and c is the size of primary grains, with a unit of μm;'}(6) coating a magnesium oxide layer on a steel plate's surfaces, and annealing; and(7) coating an insulation layer.2. The manufacturing method of common oriented silicon steel having high magnetic induction according to claim 1 , wherein in the step (2) claim 1 , the hot-rolling begins at a temperature of 1180° C. or below claim 1 , and ends at a temperature of 860° C. or above claim 1 , and then a coiling after the hot ...

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Номер записи: 83
20-11-2014 дата публикации

METHOD OF PRODUCING GRAIN-ORIENTED ELECTRICAL STEEL SHEET HAVING EXCELLENT IRON LOSS PROPERTIES

Номер: US20140338794A1
Автор: Senda Kunihiro, Shingaki Yukihiro, Watanabe Makoto
Принадлежит: JFE STEEL CORPORATION

In the production of a grain-oriented electrical steel sheet by hot rolling a steel slab comprising C: 0.001˜0.10 mass %, Si: 1.0˜5.0 mass %, Mn: 0.01˜0.5 mass %, sol. Al: 0.003˜0.050 mass %, N: 0.0010˜0.020 mass %, one or two selected from S and Se: 0.005˜0.040 mass % in total, cold rolling, primary recrystallization annealing, and final annealing, a heating rate S1 between a temperature T1 (° C.): 500+2×(NB−NA) and a temperature T2 (° C.): 600+2×(NB−NA) in a heating process of the primary recrystallization annealing is set to not less than 80° C./sec, and an average heating rate S2 from the temperature T2 to 750° C. is set to 0.1˜0.7 times of S1, whereby a grain-oriented electrical steel sheet having a low iron loss over a full length of a product coil is obtained.

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Номер записи: 84
15-08-2019 дата публикации

HOT-BAND ANNEALING EQUIPMENT, HOT-BAND ANNEALING METHOD AND DESCALING METHOD FOR SI-CONTAINING HOT ROLLED STEEL SHEET

Номер: US20190249270A1
Автор: Harada Yoshimitsu, MATSUBARA Yukihiro, Takatsu Takahiro, Tamura Yuta, Yamada Goki
Принадлежит: JFE STEEL CORPORATION

Provided is a hot-band annealing equipment provided with a heating zone, a soaking zone and a cooling zone for subjecting a Si-containing hot rolled steel sheet to hot-band annealing, wherein when the Si-containing hot rolled steel sheet is subjected to hot-band annealing with the hot-band annealing equipment provided with a rapid heating device at an upstream side of the heating zone and/or in an inlet side of the heating zone, the hot rolled steel sheet is heated by not lower than 50° C. at a heating rate of not less than 15° C./s by using the rapid heating device to improve a descaling property, whereby descaling can be performed only by pickling without requiring mechanical descaling or heating the steel sheet in the pickling process. Also provided are a hot-band annealing method and a descaling method using the above equipment. 18-. (canceled)9. A hot-band annealing equipment provided with a heating zone , a soaking zone and a cooling zone for subjecting a Si-containing hot rolled steel sheet to hot-band annealing , characterized in that a rapid heating device is disposed at an upper stream side of the heating zone and/or an inlet side of the heating zone.10. The hot-band annealing equipment according to claim 9 , wherein the rapid heating device is an induction heating device or an electric heating device.11. A hot-band annealing method for subjecting a Si-containing hot rolled steel sheet to hot-band annealing with the hot-band annealing equipment according to claim 9 , characterized in that a start temperature for heating the Si-containing hot-rolled steel sheet in the rapid heating device is in a range of room temperature to 700° C. and the Si-containing hot rolled steel sheet is heated by not lower than 50° C. at a heating rate of not less than 15° C./s by using the rapid heating device.12. A hot-band annealing method for subjecting a Si-containing hot rolled steel sheet to hot-band annealing with the hot-band annealing equipment according to claim 10 , ...

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Номер записи: 85
14-09-2017 дата публикации

NON-ORIENTED ELECTRICAL STEEL SHEET AND METHOD FOR PRODUCING THE SAME, AND MOTOR CORE AND METHOD OF PRODUCING THE SAME

Номер: US20170260600A1
Автор: Koseki Shinji, Nakanishi Tadashi, Oda Yoshihiko, Okubo Tomoyuki
Принадлежит: JFE STEEL CORPORATION

A non-oriented electrical steel sheet is obtained by subjecting a slab containing C: not more than 0.005 mass %, Si: 1.0-5.0 mass %, Mn: 0.04-3.0 mass %, sol. Al: not more than 0.005 mass %, P: 0.03-0.2 mass %, S: not more than 0.005 mass %, N: not more than 0.005 mass %, B: not more than 0.001 mass %, and Se: not more than 0.001 mass % and satisfying sol. Al+C+5B+5Se≦0.005 mass % to hot rolling, cold rolling and finish annealing. A sheet temperature at the outlet side of the rolling machine in at least one pass of the final cold rolling is set to a range of 100-300° C. to provide S/2M of not less than 1.0 and S/5C of not less than 1.0 when X-ray intensity ratios of {001}<250>, {111}<112> and {001}<100> in a central layer in a thickness direction are S, M and C, respectively. 110-. (canceled)12. The non-oriented electrical steel sheet according to claim 11 , which further contains at least one of the following Group A and Group B:Group A: one or two selected from Sn: 0.01-0.2 mass % and Sb: 0.01-0.2 mass %, andGroup B: one or more selected from REM: 0.0005-0.005 mass %, Mg: 0.0005-0.005 mass % and Ca: 0.0005-0.005 mass %,in addition to the above chemical composition.13. The non-oriented electrical steel sheet according to claim 11 , wherein an average crystal grain size is less than 40 μm.14. The non-oriented electrical steel sheet according to claim 12 , wherein an average crystal grain size is less than 40 μm.15. A method of producing a non-oriented electrical steel sheet comprising a series of steps of hot rolling a steel slab having a chemical composition as claimed in claim 11 , conducting a hot band annealing at a soaking temperature of 800-1200° C. for a soaking time of not more than 5 minutes claim 11 , performing one cold rolling or two or more cold rollings interposing an intermediate annealing therebetween to obtain a cold rolled sheet with a final thickness and subjecting the sheet to finish annealing claim 11 , wherein a temperature of the sheet at an ...

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Номер записи: 86
13-09-2018 дата публикации

GRAIN-ORIENTED ELECTRICAL STEEL SHEET AND HOT-ROLLED STEEL SHEET FOR GRAIN-ORIENTED ELECTRICAL STEEL SHEET

Номер: US20180258508A1
Автор: Fujimura Hiroshi, Kataoka Takashi, Takahashi Fumiaki
Принадлежит: NIPPON STEEL & SUMITOMO METAL CORPORATION

A grain-oriented electrical steel sheet includes: a chemical composition represented by, in mass %, Si: 2.0% to 5.0%, Mn: 0.03% to 0.12%, Cu: 0.10% to 1.00%, sb or Sn, or both thereof: 0.000% to 0.3% in total, Cr: 0% to 0.3%, P: 0% to 0.5%, Ni: 0% to 1%, and the balance: Fe and impurities, in which an L-direction average diameter of crystal grains observed on a surface of the steel sheet in an L direction parallel to a rolling direction is equal to or more than 3.0 times a C-direction average diameter in a C direction vertical to the rolling direction. 1. A grain-oriented electrical steel sheet , comprising:a chemical composition represented by, in mass %,Si: 2.0% to 5.0%,Mn: 0.03% to 0.12%,Cu: 0.10% to 1.00%,Sb or Sn, or both thereof: 0.000% to 0.3% in total,Cr: 0% to 0.3%,P: 0% to 0.5%,Ni: 0% to 1%, andthe balance: Fe and impurities, whereinan L-direction average diameter of crystal grains observed on an surface of the steel sheet in an L direction parallel to a rolling direction is equal to or more than 3.0 times a C-direction average diameter in a C direction vertical to the rolling direction.2. The grain-oriented electrical steel sheet according to claim 1 , wherein the L-direction average diameter is equal to or more than 3.5 times the C-direction average diameter.3. A hot-rolled steel sheet for a grain-oriented electrical steel sheet claim 1 , comprising:a chemical composition represented by, in mass %,C: 0.015% to 0.10%,Si: 2.0% to 5.0%,Mn: 0.03% to 0.12%,acid-soluble Al: 0.010% to 0.065%,N: 0.0040% to 0.0100%,Cu: 0.10% to 1.00%,Cr: 0% to 0.3%,P: 0% to 0.5%,Ni: 0% to 1%,S or Se, or both thereof: 0.005% to 0.050% in total,Sb or Sn, or both thereof: 0.000% to 0.3% in total,Y, Te, La, Ce, Nd, Hf, Ta, Pb, or Bi, or any combination thereof: 0.0000% to 0.01% in total, andthe balance: Fe and impurities, wherein{'sub': '2', 'MnS or MnSe, or both thereof having a circle-equivalent diameter of 50 nm or less are dispersed and CuS is not substantially precipitated.'}4. ...

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Номер записи: 87
28-10-2021 дата публикации

NON-ORIENTED ELECTRICAL STEEL SHEET AND METHOD OF PRODUCING SAME

Номер: US20210332464A1
Автор: Nakajima Hiroaki, Oda Yoshihiko, Okubo Tomoyuki, UESAKA Masanori, Zaizen Yoshiaki
Принадлежит: JFE STEEL CORPORATION

Provided is a non-oriented electrical steel sheet that contains substantially no Al and contains large amounts of Si and Mn and has low iron loss, comprising a chemical composition containing C: 0.0050% or less, Si: 2.0% or more and 6.0% or less, Mn: 1.0% or more and 3.0% or less, P: 0.20% or less, S: 0.0050% or less, N: 0.0050% or less, Al: 0.0050% or less, and one or more selected from B: 0.0001% or more and 0.0050% or less, Nb: 0.0001% or more and 0.0050% or less, and V: 0.0005% or more and 0.0500% or less, with a balance consisting of Fe and inevitable impurities, wherein a number density of Si—Mn nitrides with an average diameter of 50 nm or more and 500 nm or less is 1 or less per μm. 1. A non-oriented electrical steel sheet , comprisinga chemical composition containing, in mass %,C: 0.0050% or less,Si: 2.0% or more and 6.0% or less,Mn: 1.0% or more and 3.0% or less,P: 0.20% or less,S: 0.0050% or less,N: 0.0050% or less,Al: 0.0050% or less, andone or more selected from the group consisting of B: 0.0001% or more and 0.0050% or less, Nb: 0.0001% or more and 0.0050% or less, and V: 0.0005% or more and 0.0500% or less,with a balance consisting of Fe and inevitable impurities,{'sup': '3', 'wherein a number density of Si—Mn nitrides with an average diameter of 50 nm or more and 500 nm or less is 1 or less per μm.'}2. The non-oriented electrical steel sheet according to claim 1 , wherein the chemical composition further contains claim 1 , in mass % claim 1 , one or two selected from the group consisting of Sn: 0.01% or more and 0.50% or less and Sb: 0.01% or more and 0.50% or less.3. The non-oriented electrical steel sheet according to claim 1 , wherein the chemical composition further contains claim 1 , in mass % claim 1 , one or more selected from the group consisting of Ca: 0.0001% or more and 0.0300% or less claim 1 , Mg: 0.0001% or more and 0.0300% or less claim 1 , and REM: 0.0001% or more and 0.0300% or less.4. The non-oriented electrical steel sheet according ...

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Номер записи: 88
22-08-2019 дата публикации

ORIENTED ELECTROMAGNETIC STEEL SHEET AND METHOD FOR MANUFACTURING ORIENTED ELECTROMAGNETIC STEEL SHEET

Номер: US20190256985A1
Автор: Hayakawa Yasuyuki, Takajo Shigehiro, Takashima Minoru, TERASHIMA Takashi, UMADA Takumi
Принадлежит: JFE STEEL CORPORATION

Provided are: an oriented electromagnetic steel sheet with outstanding coating adhesion and magnetic properties after stress relief annealing; and a method for manufacturing the oriented electromagnetic steel sheet. The oriented electromagnetic steel sheet comprises: a steel sheet; a non-oxide ceramic coating disposed on the steel sheet and containing a non-oxide; and an insulating tensile coating disposed on the non-oxide ceramic coating and containing an oxide. The thickness of the non-oxide ceramic coating is 0.020-0.400 μm. The thickness of the insulating tensile coating is at least 1.0 μm. The chromium content on the steel plate side of the non-oxide ceramic coating is less than 25 atomic %, and the chromium content on the insulating tensile coating side of the non-oxide ceramic coating is at least 25 atomic %. 110.-. (canceled)11. A grain oriented electrical steel sheet , comprising:a steel sheet;a non-oxide ceramic coating containing a non-oxide and disposed on the steel sheet; andan insulation tension coating containing an oxide and disposed on the non-oxide ceramic coating,wherein the non-oxide ceramic coating has a thickness of not less than 0.020 μm but not more than 0.400 μm,wherein the insulation tension coating has a thickness of not less than 1.0 μm,wherein an amount of Cr in the non-oxide ceramic coating on the steel sheet side is less than 25 at %, andwherein an amount of Cr in the non-oxide ceramic coating on the insulation tension coating side is not less than 25 at %.12. The grain oriented electrical steel sheet according to claim 11 ,wherein the non-oxide ceramic coating contains, as the non-oxide, at least one selected from the group consisting of a Ti-containing carbide, a Ti-containing nitride and a Ti-containing carbonitride.13. The grain oriented electrical steel sheet according to claim 11 ,wherein the non-oxide ceramic coating includes a coating A disposed on the steel sheet and a coating B disposed on the coating A, andwherein the amount ...

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Номер записи: 89
20-09-2018 дата публикации

CONTINUOUS ANNEALING METHOD FOR LOW COERCIVE FORCE COLD-ROLLED ELECTROMAGNETIC PURE IRON PLATE AND STRIP

Номер: US20180265945A1
Автор: CHENG Guoping, LIANG Gaofei, LIN Changqing, YAN Yuanyuan
Принадлежит:

A continuous annealing method for low coercive force cold-rolled electromagnetic pure iron plate and strip. Control parameters of each stages in a continuous annealing process are as follows: 750-850° C. at a heating stage; 750-850° C. at a soaking stage, the soaking time is 100-150 s; an outlet temperature of 575-675° C. at a slow-cooling stage, the cooling speed in slow-cooling stage is 2.5-10° C./s; an outlet temperature of 380-420° C. at a fast-cooling stage, the cooling speed of the fast-cooling stage is 15-25° C./s; and 270-310° C. at an overaging stage. The annealing medium is a non-oxidizing atmosphere composed of Hand N. After annealing, the cold-rolled electromagnetic pure iron plate and strip is leveled and pressed such that the leveling elongation rate of the plate and strip is controlled within the range of 0.2±0.1%. The process of the continuous annealing method is simple, and the produced cold-rolled electromagnetic pure iron plate and strip can achieve an overall performance of low coercive force and good formability without further magnetic annealing. 1. A continuous annealing method for low coercive force cold-rolled electromagnetic pure iron sheet strip , wherein control parameters of each stages in a continuous annealing process are as follows: 750-850° C. at a heating stage; 750-850° C. at a soaking stage , with a soaking time being 100-150 s; an outlet temperature of 575-675° C. at a slow-cooling stage , with a cooling speed in slow-cooling stage being 2.5-10° C./s; an outlet temperature of 380-420° C. at a fast-cooling stage , with a cooling speed of the fast-cooling stage being 15-25° C./s; and 270-310° C. at an overaging stage; an annealing medium is a non-oxidizing atmosphere composed of Hand N; after annealing , the cold-rolled electromagnetic pure iron sheet strip is leveled and pressed such that a leveling elongation rate of the sheet strip is controlled within a range of 0.2±0.1%.2. The continuous annealing method for low coercive force ...

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Номер записи: 90
21-09-2017 дата публикации

GRAIN-ORIENTED ELECTRICAL STEEL SHEET AND MANUFACTURING METHOD THEREFOR

Номер: US20170271061A1
Автор: Han Kyu-Seok, JOO Hyung Don, KO Hyun-Seok, Lim Jae-Soo, PARK Hyung-Ki, SEO Jin-Wook
Принадлежит:

Disclosed are an oriented electrical steel sheet and a manufacturing method thereof. An exemplary embodiment of the present invention provides a method of manufacturing an oriented electrical steel sheet, including: providing a slab including Si at 1.0 to 4.0 wt %, C at 0.1 to 0.4 wt %, and the remaining portion including Fe and other inevitably incorporated impurities; reheating the slab; producing a hot rolled steel sheet by hot rolling the slab; performing annealing of the hot rolled steel sheet; cold rolling the annealed hot rolled steel sheet; decarburizing and annealing the cold rolled steel sheet; cold rolling the decarburized and annealed steel sheet; and final annealing the cold rolled steel sheet.

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Номер записи: 91
18-12-2014 дата публикации

METHOD FOR PRODUCING A NON-GRAIN-ORIENTED HIGHER-STRENGTH ELECTRICAL STRIP AND USE THEREOF

Номер: US20140366988A1
Автор: Dorninger Franz, Kreuzer Herbert, Sonnleitner Roman
Принадлежит:

A method for producing a higher-strength, non-grain-oriented electrical strip, according to which a slab is cast from a molten mass, the slab is hot-rolled and then cold-rolled—optionally a hot-strip annealing can be carried out between the hot-rolling and the cold-rolling —and the cold strip is annealed in order to produce a partially recrystallized structure so that the mechanical strength values ReH can be set within the range of 450 MPa to 850 MPa at an annealing temperature of between 600° C. and 800° C. for 60 s to 300 s. 1. A method for producing a higher-strength non-grain-oriented electrical strip , comprising:casting a slab from a molten mass;hot-rolling the slab;optionally hot strip annealing the slab after the hot-rolling and before cold-rolling;cold-rolling the slab to produce a partially recrystallized structure so as to set ReH strength values in the range from 450 MPa to 850 MPa;annealing the cold strip at an annealing temperature from 600° C. to 800° C. for 60 s to 300 s; andmaking adjustments to segregation regions in the strip.2. The method according to claim 1 , comprising using an electrical strip with the following chemical composition:C <0.01 mass %Si 1.5 mass %-3.5 mass % 'in particular 0.1 mass % to 1.5 mass %', 'Al 0.1 mass %-2.0 mass %,'}Mn 0.1 mass %-1 mass %P 0.01 mass %-0.2 mass %S <0.01 mass %.3. The method according to claim 1 , wherein the content of Ni+Cr+Ti+Nb+V+Cu combined in the electrical strip is <1 mass %.4. The method according to claim 1 , wherein the degree of recrystallization is between 5% and 95%.5. The method according to claim 1 , further comprising rolling the electrical strip to a thickness of 0.1 mm to 1.5 mm.6. The method according to claim 1 , comprising carrying out the annealing so that a recrystallization takes place in silicon-poorer regions that are close to the surface of the structure claim 1 , wherein segregation regions with an elevated silicon content only occur in a relaxed and non-recrystallized state. ...

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Номер записи: 92
29-09-2016 дата публикации

GRAIN-ORIENTED ELECTRICAL STEEL SHEET AND METHOD OF MANUFACTURING GRAIN-ORIENTED ELECTRICAL STEEL SHEET

Номер: US20160284454A1
Автор: CHO Seiichiro, HIRANO Koji, NAGANO Shohji, Nakamura Yoshio
Принадлежит:

A method of manufacturing a grain-oriented electrical steel sheet, includes: a laser processing process of forming a laser processed portion by irradiating a region on one end side of a steel sheet in a width direction after being subjected to a cold rolling process with a laser beam along a rolling direction of the steel sheet; and a finish annealing process of coiling the steel sheet with the laser processed portion formed thereon in a coil shape and performing a finish annealing on the coil-shaped steel sheet. In the laser processing process, a melted-resolidified portion having a depth of greater than 0% and equal to or less than 80% of a sheet thickness of the steel sheet is formed by the irradiation of the laser beam at a position corresponding to the laser processed portion. 1. A grain-oriented electrical steel sheet which is manufactured by irradiating a region on one end side of a steel sheet in a width direction after being subjected to a cold rolling process with a laser beam along a rolling direction of the steel sheet and thereafter performing a finish annealing on the steel sheet which is coiled in a coil shape ,wherein, regarding grains in a base iron portion of the steel sheet, which are positioned at a lower portion of a laser irradiation mark formed on a surface of the steel sheet by the irradiation of the laser beam, an angular deviation amount θa between a direction of a magnetization easy axis of each of the grains and the rolling direction is defined, and an average value R of the angular deviation amounts θa obtained by averaging the angular deviation amounts θa of the grains by the grains positioned at the lower portion of the laser irradiation mark is higher than 20° and equal to or less 40°.2. The grain-oriented electrical steel sheet according to claim 1 ,wherein a distance WL from one end of the steel sheet in the width direction to a center of the laser irradiation mark in the width direction is 5 mm to 35 mm.3. The grain-oriented ...

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Номер записи: 93
05-09-2019 дата публикации

STEEL STRIP FOR PRODUCING A NON-ORIENTED ELECTRICAL STEEL, AND METHOD FOR PRODUCING SUCH A STEEL STRIP

Номер: US20190271053A1
Автор: Georgeou Zacharias, KLOSE FRANK
Принадлежит: SALZGITTER FLACHSTAHL GMBH

The invention relates to a steel strip for producing a non-oriented electrical steel. To achieve greatly improved frequency-independent magnetic properties, in particular greatly reduced hysteresis losses, in comparison with known electrical steels, the following alloy composition in wt % is proposed: C: ≤0.03, Al: 1 to 12, Si: 0.3 to 3.5, Mn: >0.25 to 10, Cu: >0.05 to 3.0, Ni: >0.01 to 5.0, total of N, S and P: at most 0.07, remainder iron and smelting-related impurities, with the optional addition of one or more elements from the group Cr, Mo, Zn and Sn, wherein the steel strip has an insulation layer substantially consisting of AlOand/or SiO2 with a thickness in the range from 10 μm to 100 μm. The invention also relates to a method for producing such a steel strip. 120.-. (canceled)21. A steel strip for producing a non-grain-oriented electrical steel sheet comprising a following alloy composition in wt. %:C: ≤0.03Al: 1 to 12Si: 0.3 to 3.5Mn: >0.25 to 10Cu: >0.05 to 3.0Ni: >0.01 to 5.0,a total of N, S and P: at most 0.07,with the remainder being iron and melting-induced impurities,{'sub': 2', '3', '2, 'said steel strip comprising an insulation layer substantially including AlOand/or SiOhaving a thickness in a range of 10 μm to 100 μm.'}22. The steel strip of claim 21 , wherein the alloy composition includes at least one element selected from the group consisting of Cr claim 21 , Mo claim 21 , Zn and Sn.23. The steel strip of claim 21 , wherein the thickness of the insulation layer is in a range of 20 μm to 100 μm.24. Steel strip as claimed in claim 21 , wherein the thickness of the insulation layer is in a range of 20 μm to 50 μm.25. The steel strip of claim 21 , wherein a total content of Cr and Mo is 0.01 to 0.5 wt. %.26. The steel strip of claim 21 , wherein a total content of Zn and Sn is 0.01 to 0.05 wt. %.27. The steel strip of claim 21 , wherein a maximum Al content is 10 wt. %.28. The steel strip of claim 21 , wherein a maximum total content of Mn and Al ...

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Номер записи: 94
05-09-2019 дата публикации

METHOD OF PRODUCING GRAIN-ORIENTED ELECTRICAL STEEL SHEET

Номер: US20190271054A1
Автор: EHASHI Yuiko, Hayakawa Yasuyuki, Imamura Takeshi, Takashima Minoru, Takenaka Masanori
Принадлежит: JFE STEEL CORPORATION

To provide a grain-oriented electrical steel sheet that has better magnetic property than conventional ones without requiring high-temperature slab heating, in the case of not performing intermediate annealing, the hot rolled steel sheet obtained by a predetermined step is subjected to hot band annealing, and, in a heating process in the hot band annealing, heating is performed at a heating rate of 10° C./s or less for 10 sec or more and 120 sec or less in a temperature range of 700° C. or more and 950° C. or less, and in the case of performing the intermediate annealing, in a heating process in final intermediate annealing, heating is performed at a heating rate of 10° C./s or less for 10 sec or more and 120 sec or less in a temperature range of 700° C. or more and 950° C. or less. 1. A method of producing a grain-oriented electrical steel sheet , comprising: C: 0.02% or more and 0.08% or less,', 'Si: 2.0% or more and 5.0% or less,', 'Mn: 0.02% or more and 1.00% or less,', 'S and/or Se: 0.0015% or more and 0.0100% or less in total,', 'N: less than 0.006%,', 'acid-soluble Al: less than 0.010%, and', 'a balance being Fe and inevitable impurities;, 'heating a steel slab in a temperature range of 1300° C. or less, the steel slab having a chemical composition containing, in mass %,'}subjecting the steel slab to hot rolling, to obtain a hot rolled steel sheet;optionally subjecting the hot rolled steel sheet to hot band annealing;subjecting the hot rolled steel sheet after the hot rolling or after the hot band annealing to cold rolling once, or twice or more with intermediate annealing performed therebetween, to obtain a cold rolled steel sheet having a final sheet thickness; andsubjecting the cold rolled steel sheet to primary recrystallization annealing and secondary recrystallization annealing,wherein in the case of not performing the intermediate annealing, the hot rolled steel sheet is subjected to the hot band annealing, and, in a heating process in the hot band ...

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Номер записи: 95
05-10-2017 дата публикации

Process for producing grain-oriented electrical steel strip and grain-oriented electrical steel strip obtained according to said process

Номер: US20170283903A1
Автор: Boettcher Andreas, Klinkenberg Christian, Schuster Ingo
Принадлежит:

A process for producing grain-oriented electrical steel strip by means of thin slab continuous casting, comprising the following process steps: a) smelting a steel, b) continuously casting the smelt by thin slab continuous casting, c) heating up the thin slabs and subjecting the slabs to homogenization annealing at a maximum temperature of 1250° C., d) heating to a temperature between 1250° C. and 1350° C., e) continuously hot rolling the thin slabs to form a hot-rolled strip, f) cooling and reeling the hot-rolled strip to form a coil, g) annealing the hot-rolled strip after reeling and prior to a subsequent cold rolling step, h) cold rolling the hot-rolled strip to the nominal usable thickness, i) subjecting the cold-rolled strip to recrystallization, decarburization and nitridation annealing, j) applying an annealing separator (non-stick layer) to the strip surface of the cold-rolled strip, k) subjecting the cold-rolled strip to secondary recrystallization annealing, forming a finished steel strip having a pronounced Goss texture, and l) stress-free annealing the finished steel strip, which has been coated with an insulating layer, provides an improved process for producing grain-oriented electrical steel strip by means of thin slab continuous casting. This is achieved in that the recrystallization, decarburization and nitridation annealing of the cold-rolled strip in process step h) comprises a decarburization annealing phase and a subsequent nitridation annealing phase, with an intermediate reduction annealing phase being interposed between the decarburization annealing phase and the nitridation annealing phase, and carried out at a temperature ranging from 820° C.-890° C., for a maximum period of 40 seconds, with a dry, gaseous annealing atmosphere, which contains nitrogen (N) and hydrogen (H) and acts on the cold-rolled strip, and which has a water vapor/hydrogen partial pressure ratio pHO/pHof less than 0.10. 2. The process according to claim 1 , ...

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Номер записи: 96
15-10-2015 дата публикации

PRODUCTION METHOD FOR HIGH-PERMEABILITY GRAIN-ORIENTED ELECTRICAL STEEL

Номер: US20150294774A1
Автор: Zirlin Mikhail B
Принадлежит:

The invention refers to ferrous metallurgy, in particular, to production of grain-oriented electrical steel deployed in a manufacture of power transformer cores. Ensuring high magnetic permeability of steel and homogeneity of the magnetic properties requires slab casting, slab heating, rough and finishing hot rolling, cooling, pickling, double cold rolling with an intermediary decarburizing annealing, MgO coating application, box annealing and flattening annealing after rolling strips are cooled within the time not exceeding two seconds, the heating for the high-temperature annealing in the temperature range of 400-700° C. is carried out at the rate of 20-25° C./hour. 1. (canceled)2. (canceled)3. (canceled)4. (canceled)5. A production method for high permeability grain-oriented electrical steel including steelmaking , slab casting , slab heating , rough and finishing hot rolling , cooling , pickling , double cold rolling with an intermediary decarburizing annealing , MgO coating application , box annealing and flattening annealing , the production method including the step of:{'sub': '2', 'implementing the steelmaking process at the following ratio of components, % of 100% of wt: C=0.018%-0.035%; Mn=0.15%-0.40%; Si=3.15%-3.50%; Al=0.010%-0.035%; N=0.009%-0.015%; Cu=0.4%-0.6% with the balance of Fe and unavoidable impurities; at that the carbon-silicon ratio is chosen so that during the finishing hot rolling the austenite ratio comes to 2-10%; the temperature of the hot rolling start and end is maintained within 1130-1280° C. and 950-1030° C. respectively; and'}cooling of as-rolled strips begins in not more than two seconds, wherein the double cold rolling is further defined by cold rolling to an intermediary thickness of 0.55-0.90 mm and then to a second cold rolling to thickness of 0.15-0.35 mm whereby decarburizing annealing in the humidified nitrogen-hydrogen mixture is performed between the cold rolling to an intermediary thickness of 0.55-0.90 mm and the second ...

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Номер записи: 97
25-12-2014 дата публикации

Non-Oriented Electrical Steel Plate and Manufacturing Process Therefor

Номер: US20140377124A1
Автор: Hei Hongxu, Liu Xiandong, Ma Aihua, Wang Bo, Xie Shishu, Zou Liang
Принадлежит: BAOSHAN IRON & STEEL CO., LTD.

Disclosed are a non-oriented electrical steel plate with low iron loss and high magnetic conductivity and a manufacturing process therefor. The casting blank of the steel plate comprises the following components: Si: 0.1-2.0 wt %, Al: 0.1-1.0 wt %, Mn: 0.10-1.0 wt %, C: ≦0.005 wt %, P: ≦0.2 wt %, S: ≦0.005 wt %, N: ≦0.005 wt %, the balance being Fe and unavoidable impurities. The magnetic conductivity of the steel plate meets the following relationship formula: μ+μ+μ≧13982−586.5P; μ+μ+μ≧10000, wherein Pis the iron loss at a magnetic induction intensity of 1.5 T at 50 Hz; μ, μ, and μare relative magnetic conductivities at induction intensities of 1.0 T, 1.3 T, and 1.5 T at 50 Hz, respectively. The steel plate can be used for manufacturing highly effective and ultra-highly effective electric motors. 1. A non-oriented electrical steel sheet comprising a casting slab which comprises: [{'br': None, 'sub': 10', '13', '15', '15/50, 'i': 'P', 'μ+μ+μ≧13982−586.5\u2003\u2003(1);'}, {'br': None, 'sub': 10', '13', '15, 'μ+μ+μ≧10000 \u2003\u2003(2),'}], 'Si: 0.1˜2.0 wt %; Al: 0.1˜1.0 wt %; Mn: 0.10˜1.0 wt %; C: ≦0.005 wt %; P: ≦0.2 wt %; S: ≦0.005 wt %; N: ≦0.005 wt %; and balance being Fe and other unavoidable impurities, and a magnetic permeability of the steel sheet satisfies formulas (1) and (2){'sub': 10', '13', '15', '15/50', '15/50, 'wherein μ, μand μrespectively represent the relative magnetic permeability at magnetic inductions of 1.0 T, 1.3 T and 1.5 T at 50 Hz; Prepresents the iron loss at 50 Hz and under a magnetic induction of 1.5 T, Pin formula (1) is calculated as a dimensionless numerical value.'}2. The steel sheet according to further comprising one or both of Sn and Sb with a total amount of ≦0.3 wt %.3. The steel sheet according to wherein said magnetic permeability further satisfies formula (3):{'br': None, 'sub': 10', '13', '15, 'μ+μ+μ≧11000 \u2003\u2003(3).'}4. A method for producing the steel sheet according to claim 1 , wherein said method comprises steps ...

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Номер записи: 98
04-10-2018 дата публикации

METHOD OF MANUFACTURING GRAIN-ORIENTED ELECTRICAL STEEL SHEET

Номер: US20180282830A1
Автор: FURUTAKU Shin, MASUMITSU Naoto, Morishige Nobusato, TADA Hirotoshi, Takahashi Masaru, Takaobushi Junichi
Принадлежит: NIPPON STEEL & SUMITOMO METAL CORPORATION

Provided is a method of manufacturing a grain-oriented electrical steel sheet including: a heating process of heating a slab having a predetermined chemical composition at T1° C. of 1150° C. to 1300° C., retaining the slab for 5 minutes to 30 hours, lowering the temperature of the slab to T2° C. of T1−50° C. or lower, heating the slab at T3° C. of 1280° C. to 1450° C., and retaining the slab for 5 minutes to 60 minutes; a hot-rolling process of hot-rolling the slab that is heated to obtain a hot-rolled steel sheet; a cold-rolling process; an intermediate annealing process of performing intermediate annealing with respect to the hot-rolled steel sheet at least one time before the cold-rolling process or before a final pass of the cold-rolling process after interrupting the cold-rolling; an annealing separating agent applying process; and a secondary film applying process. In the cold-rolling process, a retention treatment is performed during a plurality of passes. In the retention treatment, retention at a temperature T° C. satisfying 170+[Bi]×5000≤T≤300 is performed one time to four times. A heating rate in the decarburization annealing process is 50° C./second or faster. 1. A method of manufacturing a grain-oriented electrical steel sheet , comprising:a heating process of heating a slab, which contains, in terms of mass %, C: 0.030% to 0.150%, Si: 2.50% to 4.00%, Mn: 0.02% to 0.30%, one or two of S and Se: 0.005% to 0.040% in a total amount, an acid-soluble Al: 0.015% to 0.040%, N: 0.0030% to 0.0150%, Bi: 0.0003% to 0.0100%, Sn: 0% to 0.50%, Cu: 0% to 0.20%, one or two of Sb and Mo: 0% to 0.30% in a total amount, and the remainder including Fe and impurities, to T1° C. of 1150° C. to 1300° C., retaining the slab for 5 minutes to 30 hours, lowering the temperature of the slab to T2° C. of T1−50° C. or lower, heating the slab at T3° C. of 1280° C. to 1450° C., and retaining the slab for 5 minutes to 60 minutes;a hot-rolling process of hot-rolling the slab that is ...

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Номер записи: 99
22-10-2015 дата публикации

PRODUCTION METHOD FOR GRAIN-ORIENTED ELECTRICAL STEEL SHEET

Номер: US20150299819A1
Автор: Hayakawa Yasuyuki, Matsuda Hiroshi, Shingaki Yukihiro, WAKISAKA Yuiko, Yamaguchi Hiroi
Принадлежит: JFE STEEL CORPORATION

Grain-oriented electrical steel sheets with good magnetic properties are industrially stably produced, by using as the material, a steel slab having a predetermined composition, wherein after cold rolling and before the start of secondary recrystallization annealing, the cold rolled sheet is subjected to nitriding treatment with nitrogen content of 50 mass ppm or more and 1000 mass ppm or less, and a total content of 0.2 mass % to 15 mass % of a sulfide and/or sulfate is contained in an annealing separator, and a staying time in the temperature range of 300° C. to 800° C. in the heating stage of secondary recrystallization annealing of 5 hours or more is secured to precipitate silicon nitride (SiN) and MnS, and using the silicon nitride in combination with MnS as inhibiting force for normal grain growth to significantly reduce variation of magnetic properties. 1. A production method for a grain-oriented electrical steel sheet , the method comprising: subjecting a steel slab to hot rolling , without re-heating or after re-heating , to obtain a hot rolled sheet , the steel slab having a composition consisting of , by mass % or mass ppm , C: 0.08% or less , Si: 2.0% to 4.5% and Mn: 0.5% or less , S: less than 50 ppm , Se: less than 50 ppm , O: less than 50 ppm , sol.Al: less than 100 ppm , N in a range satisfying [sol.Al]×(14/27) ppm≦N≦80 ppm , and the balance being Fe and incidental impurities; then subjecting the hot rolled sheet to annealing and cold rolling to obtain a cold rolled sheet of final sheet thickness; then subjecting the cold rolled sheet to primary recrystallization annealing; then applying an annealing separator thereon; and then subjecting the cold rolled sheet to secondary recrystallization annealing ,wherein after cold rolling and before the start of secondary recrystallization annealing, the cold rolled sheet is subjected to nitriding treatment to obtain a nitrogen content of 50 mass ppm or more and 1000 mass ppm or less,a total content of 0.2 mass ...

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Номер записи: 100