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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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Форма поиска

Поддерживает ввод нескольких поисковых фраз (по одной на строку). При поиске обеспечивает поддержку морфологии русского и английского языка
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Применить Всего найдено 21300. Отображено 100.
26-01-2012 дата публикации

High strength steel pipe for low-temperature usage having excellent buckling resistance and toughness of welded heat affected zone and method for producing the same

Номер: US20120018028A1
Автор: Junji Shimamura, Mitsuhiro Okatsu, Nobuo Shikanai, Nobuyuki Ishikawa
Принадлежит: JFE Steel Corp

An APIX100-grade high strength steel pipe includes a base material containing, in mass percentage, C: more than 0.03% and 0.08% or less, Si: 0.01% to 0.5%, Mn: 1.5% to 3.0%, P: 0.015% or less, S: 0.005% or less, Al: 0.01% to 0.08%, Nb: 0.005% to 0.025%, Ti: 0.005% to 0.025%, N: 0.001% to 0.010%, O: 0.005% or less, and B: 0.0003% to 0.0020%, further contains one or more of Cu, Ni, Cr, Mo, and V, satisfies 0.19≦P cm ≦0.25, the balance being Fe and unavoidable impurities, and has a TS of 760 to 930 MPa, a uniform elongation of 5% or more, and a YR of 85% or less; the seam weld metal has a specific composition.

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Номер записи: 1
26-01-2012 дата публикации

Steel sheet for cans with excellent surface properties after drawing and ironing and method for producing the same

Номер: US20120018055A1
Автор: Hiroki Iwasa, Katsumi Kojima, Masaki Tada, Yusuke Nakagawa
Принадлежит: JFE Steel Corp

A component composition contains, by % by mass, 0.0016 to 0.01% of C, 0.05 to 0.60% of Mn, and 0.020 to 0.080% of Nb so that the C and Nb contents satisfy the expression, 0.4≦(Nb/C)×(12/93)≦2.5. In addition, the amount of Nb-based precipitates is 20 to 500 ppm by mass, the average grain diameter of the Nb-based precipitates is 10 to 100 nm, and the average crystal grain diameter of ferrite is 6 to 10 μm. Nb is added to ultra-low-carbon steel used as a base, and the amount and grain diameter of the Nb-based precipitates are controlled to optimize the pinning effect. Grain refinement of ferrite is achieved by specifying the Mn amount, thereby achieving softening and excellent resistance to surface roughness of steel.

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Номер записи: 2
09-02-2012 дата публикации

High-strength steel sheet, hot-dipped steel sheet, and alloy hot-dipped steel sheet that have excellent fatigue, elongation, and collision characteristics, and manufacturing method for said steel sheets

Номер: US20120031528A1
Автор: Koichi Goto, Kunio Hayashi, Naoki Matsutani, Nobuhiro Fujita, Toshimasa Tomokiyo
Принадлежит: Individual

This high-strength steel sheet includes: in terms of percent by mass, 0.03 to 0.10% of C; 0.01 to 1.5% of Si; 1.0 to 2.5% of Mn; 0.1% or less of P; 0.02% or less of S; 0.01 to 1.2% of Al; 0.06 to 0.15% of Ti; and 0.01% or less of N; and contains as the balance, iron and inevitable impurities, wherein a tensile strength is in a range of 590 MPa or more, and a ratio between the tensile strength and a yield strength is in a range of 0.80 or more, a microstructure includes bainite at an area ratio of 40% or more and the balance being either one or both of ferrite and martensite, a density of Ti(C,N) precipitates having sizes of 10 nm or smaller is in a range of 10 10 precipitates/mm 3 or more, and a ratio (Hvs/Hvc) of a hardness (Hvs) at a depth of 10 μm from a surface to a hardness (Hvc) at a center of a sheet thickness is in a range of 0.85 or more.

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Номер записи: 3
03-05-2012 дата публикации

High strength steel sheet and method for manufacturing the same

Номер: US20120107633A1
Автор: Katsumi Nakajima, Katsumi Yamada, Kazuhiro Seto, Koichi Nakagawa, Satoshi Kinoshiro, Takeshi Yokota, Tetsuya Mega, Yuji Tanaka
Принадлежит: JFE Steel Corp

A high-strength steel sheet includes a composition containing, in mass percent, 0.08% to 0.20% of carbon, 0.2% to 1.0% of silicon, 0.5% to 2.5% of manganese, 0.04% or less of phosphorus, 0.005% or less of sulfur, 0.05% or less of aluminum, 0.07% to 0.20% of titanium, and 0.20% to 0.80% of vanadium, the balance being iron and incidental impurities.

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Номер записи: 4
17-05-2012 дата публикации

Hic-resistant thick steel plate and uoe steel pipe

Номер: US20120121453A1
Автор: Akio Yamamoto, Izuru Minato, Nobuaki Takahashi
Принадлежит: Sumitomo Metal Industries Ltd

A thick steel plate and a UOE steel pipe having a high strength of at least X60 grade and improved resistance to HIC have a chemical composition consisting essentially of, in mass percent, C: 0.02-0.07%, Si: 0.05-0.50%, Mn: 1.1-1.6%, P: at most 0.015%, S: at most 0.002%, Nb: 0.005-0.060%, Ti: 0.005-0.030%, Al: 0.005-0.06%, Ca: 0.0005-0.0060%, N: 0.0015-0.007%, at least one of Cu, Ni, Cr, and Mo in a total amount of greater than 0.1% and less than 1.5%, and a remainder of Fe and impurities, wherein the degrees of segregation of Nb and Ti are both at most 2.0, and the ratio of (the degree of Nb segregation)/(the degree of Mn segregation) and the ratio of (the degree of Ti segregation)/(the degree of Mn segregation) are both at least 1.0 and at most 1.5.

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Номер записи: 5
21-06-2012 дата публикации

Non-oriented electrical steel sheet

Номер: US20120156086A1
Автор: Takeshi Kubota
Принадлежит: Individual

A non-oriented electrical steel sheet contains 2.8 mass % or more and 4.0 mass % or less of Si, 0.2 mass % or more and 3.0 mass % or less of Al, and 0.02 mass % or more and 0.2 mass % or less of P. The non-oriented electrical steel sheet contains further contains 0.5 mass % or more in total of at least one kinds selected from a group consisting of 4.0 mass % or less of Ni and 2.0 mass % or less of Mn. A C content is 0.05 mass % or less, a N content is 0.01 mass % or less, an average grain diameter is 15 μm or less, and a <111> axial density is 6 or larger.

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Номер записи: 6
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: 7
03-01-2013 дата публикации

High-strength hot-rolled steel sheet and method of manufacturing the same

Номер: US20130000791A1
Автор: Junji Haji, Osamu Kawano, Yuzo Takahashi
Принадлежит: Individual

On a cross section with a sheet width direction of a high-strength hot-rolled steel sheet set as a normal line, with regard to an inclusion having a major diameter of 3.0 μm or more, a maximum of a major diameter/minor diameter ratio expressed by (a major diameter of the inclusion)/(a minor diameter of the inclusion) is 8.0 or less, and a sum total of a rolling direction length per 1 mm 2 cross section of a predetermined inclusion group composed of plural inclusions each having a major diameter of 3.0 μm or more and a predetermined extended inclusion having a length in a rolling direction of 30 μm or more is 0.25 mm or less. The plural inclusions composing the predetermined inclusion group congregate in both the rolling direction and a direction perpendicular to the rolling direction 50 μm or less apart from each other. The predetermined extended inclusion is spaced over 50 μm apart from all the inclusions each having a major diameter of 3.0 μm or more in at least either the rolling direction or the direction perpendicular to the rolling direction.

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Номер записи: 8
03-01-2013 дата публикации

Soft magnetic alloy and method for producing a soft magnetic alloy

Номер: US20130000797A1
Автор: Joachim Gerster, Niklas VOLBERS, Witold Pieper
Принадлежит: Vacuumschmelze GmbH and Co KG

A soft magnetic alloy is provided that consists essentially of 47 weight percent≦Co≦50 weight percent, 1 weight percent≦V≦3 weight percent, 0 weight percent≦Ni≦0.25 weight percent, 0 weight percent≦C≦0.007 weight percent, 0 weight percent≦Mn≦0.1 weight percent, 0 weight percent≦Si≦0.1 weight percent, at least one of niobium and tantalum in amounts of x weight percent of niobium, y weight percent of tantalum, remainder Fe. The alloy includes 0 weight percent≦x<0.15 weight percent, 0 weight percent≦y≦0.3 weight percent and 0.14 weight percent≦(y+2x)≦0.3 weight percent. The soft magnetic alloy has been annealed at a temperature in the range of 730° C. to 880° C. for a time of 1 to 6 hours and comprises a yield strength in the range of 200 MPa to 450 MPa and a coercive field strength of 0.3 A/cm to 1.5 A/cm.

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Номер записи: 9
24-01-2013 дата публикации

Rare-earth permanent magnetic powder, bonded magnet, and device comprising the same

Номер: US20130020527A1
Автор: Dunbo Yu, HONGWEI Li, Kuoshe LI, Min Wang, Shipeng Li, Yang Luo, Yongqiang YUAN
Принадлежит: Grirem Advanced Materials Co Ltd

A rare-earth permanent magnetic powder, a bonded magnet, and a device comprising the bonded magnet are provided. The rare-earth permanent magnetic powder is mainly composed of 7-12 at % of Sm, 0.1-1.5 at % of M, 10-15 at % of N, 0.1-1.5 at % of Si, and Fe as the balance, wherein M is at least one element selected from the group of Be, Cr, Al, Ti, Ga, Nb, Zr, Ta, Mo, and V, and the main phase of the rare-earth permanent magnetic powder is of TbCu 7 structure. Element Si is added into the rare-earth permanent magnetic powder for increasing the ability of SmFe alloy to from amorphous structure, and for increasing the wettability of the alloy liquid together with the addition of element M in a certain content, which enables the alloy liquid prone to be injected out of a melting device. The average diameter of the rare-earth permanent magnetic powder is in the range of 10-100 μm, and the rare-earth permanent magnetic powder is composed of nanometer crystals with average grain size of 10-120 nm or amorphous structure

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Номер записи: 10
21-02-2013 дата публикации

High strength stick electrode

Номер: US20130043227A1
Автор: Ashish Kapoor, Craig Dallam, Michael J. Morlock
Принадлежит: Lincoln Global Inc

A shielded metal arc welding electrode for depositing a high strength weld metal bead on a workpiece which satisfies the strength requirements under America Welding Society A5.5 standard's E11018M classification with no chromium added to the composition of the electrode.

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Номер записи: 11
14-03-2013 дата публикации

HIGH STRENGTH HOT-ROLLED STEEL SHEET HAVING EXCELLENT STRETCH FLANGEABILITY AND FATIGUE RESISTANCE AND METHOD FOR MANUFACTURING THE SAME

Номер: US20130061989A1
Автор: Funakawa Yoshimasa, Moriyasu Noriaki, Murata Takayuki, Nakajima Katsumi, Nakamura Nobuyuki, Saito Hayato
Принадлежит: JFE STEEL CORPORATION

A high strength hot-rolled steel sheet has a tensile strength of not less than 780 MPa and exhibits excellent stretch flangeability and excellent fatigue resistance. A steel has a composition containing C at 0.05 to 0.15%, Si at 0.2 to 1.2%, Mn at 1.0 to 2.0%, P at not more than 0.04%, S at not more than 0.005%, Ti at 0.05 to 0.15%, Al at 0.005 to 0.10% and N at not more than 0.007%. 1. A high strength hot-rolled steel sheet with excellent stretch flangeability and fatigue resistance which has a composition comprising , in terms of mass % ,C at 0.05 to 0.15%, Si at 0.2 to 1.2%,Mn at 1.0 to 2.0%, P at not more than 0.04%,S at not more than 0.005%, Ti at 0.05 to 0.15%,Al at 0.005 to 0.10% and N at not more than 0.007%,wherein content of dissolved Ti is not less than 0.02%, the balance being represented by Fe and inevitable impurities, and comprises a bainite single phase microstructure having an average grain diameter of not more than 5 μm.2. The high strength hot-rolled steel sheet according to claim 1 , wherein the average grain diameter is more than 3.0 to 5 μm.3. The high strength hot-rolled steel sheet according to claim 1 , wherein the steel sheet has a microstructure comprising a bainite phase at an area ratio of not less than 90% relative to the entirety of the microstructure and a second phase other than the bainite phase and in which the average grain diameter of the bainite phase is not more than 5 μm and the average grain diameter of the second phase is not more than 3 μm.4. The high strength hot-rolled steel sheet according to claim 3 , wherein the average grain diameter of the bainite phase is more than 3.0 to 5 μm.5. The high strength hot-rolled steel sheet according to claim 1 , wherein the composition further comprises claim 1 , in terms of mass % claim 1 , Sb at 0.001 to 0.020%.6. The high strength hot-rolled steel sheet according to claim 1 , wherein the composition further comprises claim 1 , in terms of mass % claim 1 , one claim 1 , or two or ...

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Номер записи: 12
28-03-2013 дата публикации

Fe-GROUP-BASED SOFT MAGNETIC POWDER

Номер: US20130076477A1
Автор: Yasushi Kino
Принадлежит: Sintokogio Ltd

The present invention provides a Fe-group-based soft magnetic powder that is used for the pressed powder magnetic cores for a choke coil, reactor coil, etc., and that has a higher magnetic permeability. At least one selected from Fe, Co, or Ni that is generally used is used as the main component of the Fe-group-based alloy (iron-based alloy) soft magnetic powder. The soft magnetic powder is produced by adding a small amount of Nb (0.05-4 wt %) or V, Ta, Ti, Mo, or W, to the molten metal and by means of an inexpensive method such as the water-atomizing method.

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Номер записи: 13
11-04-2013 дата публикации

HIGH-STRENGTH HOT-ROLLED STEEL SHEET HAVING EXCELLENT FORMABILITY AND METHOD FOR MANUFACTURING THE SAME

Номер: US20130087252A1
Автор: Ariga Tamako, Funakawa Yoshimasa, Moriyasu Noriaki, Murata Takayuki, Nakajima Katsumi
Принадлежит: JFE STEEL CORPORATION

A high-strength hot-rolled steel sheet has a composition including C: 0.005% or more and 0.050% or less, Si: 0.2% or less, Mn: 0.8% or less, P: 0.025% or less, S: 0.01% or less, N: 0.01% or less, Al: 0.06% or less, and Ti: 0.05% or more and 0.10% or less, on a mass percent basis, such that S, N, and Ti satisfy Ti≧0.04+(N/14×48+S/32×48), the remainder being Fe and incidental impurities; a matrix in which a ferrite phase constitutes 95% by area or more of the entire structure; and a structure in which Ti-containing fine carbide having an average grain size of less than 10 nm is dispersedly precipitated, and the volume ratio of the fine carbide to the entire structure is 0.0007 or more. 1. A high-strength hot-rolled steel sheet having excellent formability , comprising: C: 0.005% or more and 0.050% or less, Si: 0.2% or less,', 'Mn: 0.8% or less, P: 0.025% or less,', 'S: 0.01% or less, N: 0.01% or less,', {'br': None, 'Ti≧0.04+(N/14×48+S/32×48)\u2003\u2003(1)'}, 'Al: 0.06% or less, and Ti: 0.05% or more and 0.10% or less, on a mass percent basis, such that S, N, and Ti satisfy Formula (1), the remainder being Fe and incidental impurities; a matrix in which a ferrite phase constitutes 95% by area or more of the entire structure; and a structure in which Ti-containing fine carbide having an average grain size of less than 10 nm is dispersedly precipitated, and volume ratio of the fine carbide to the entire structure is 0.0007 or more, wherein the high-strength hot-rolled steel sheet has a tensile strength of 590 MPa or more], 'a composition comprising'}wherein S, N, and Ti denote their respective contents (% by mass).5. The steel sheet according to claim 1 , further comprising at least one of Cu claim 1 , Sn claim 1 , Ni claim 1 , Ca claim 1 , Mg claim 1 , Co claim 1 , As claim 1 , Cr claim 1 , W claim 1 , Nb claim 1 , Pb claim 1 , and Ta claim 1 , which in total constitutes 0.1% or less of the composition on a mass percent basis.6. The steel sheet according to claim 1 , ...

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Номер записи: 14
11-04-2013 дата публикации

HIGH STRENGTH HOT-ROLLED STEEL SHEET HAVING EXCELLENT STRETCH-FLANGE FORMABILITY AND METHOD FOR MANUFACTURING THE SAME

Номер: US20130087254A1
Автор: Ariga Tamako, Funakawa Yoshimasa, Moriyasu Noriaki, Murata Takayuki
Принадлежит: JFE STEEL CORPORATION

A high strength hot-rolled steel sheet has a composition containing more than 0.035% to 0.055% C, 0.2% or less Si, 0.35% or less Mn, 0.03% or less P, 0.03% or less S, 0.1% or less Al, 0.01% or less N, 0.08% to 0.25% Ti, and 0.0005% to 0.0035% B on a mass basis, solute B being 0.0005% or more, the remainder being Fe and unavoidable impurities; a matrix containing a ferrite phase having an area fraction of more than 95%; a microstructure in which Ti carbides having an average grain size of less than 10 nm are finely precipitated in grains of the ferrite phase and the volume fraction of the Ti carbides is 0.0015 to 0.007; and a tensile strength of 780 MPa or more. 1. A high strength hot-rolled steel sheet with excellent stretch-flange formability , having a composition comprising more than 0.035% to 0.055% C , 0.2% or less Si , 0.35% or less Mn 0.03% or less P , 0.03% or less s , 0.1% or less Al , 0.01% or less N , 0.08% to 0.25% Ti , and 0.0005% to 0.0035% B on a mass basis , solute B being 0.0005% or more , the remainder being Fe and unavoidable impurities; a matrix containing a ferrite phase having an area fraction of more than 95%; a microstructure in which Ti carbides having an average grain size of less than 10 nm are finely precipitated in grains of the ferrite phase and volume fraction of the Ti carbides is 0.0015 to 0.007; and a tensile strength of 780 MPa or more.2. The high strength hot-rolled steel sheet according to claim 1 , further comprising a plating layer on a surface of a steel sheet.3. The high strength hot-rolled steel sheet according to claim 1 , further comprising claim 1 , in total claim 1 , 1.0% or less of one or more of REMs claim 1 , Zr claim 1 , Nb claim 1 , V claim 1 , As claim 1 , Cu claim 1 , Ni claim 1 , Sn claim 1 , Pb claim 1 , Ta claim 1 , W claim 1 , Mo claim 1 , Cr claim 1 , Sb claim 1 , Mg claim 1 , Ca claim 1 , Co claim 1 , Sc claim 1 , Zn claim 1 , and Cs on a mass basis in addition to the composition.4. A method of manufacturing ...

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Номер записи: 15
11-04-2013 дата публикации

ULTRA HIGH STRENGTH COLD ROLLED STEEL SHEET HAVING EXCELLENT DUCTILITY AND DELAYED FRACTURE RESISTANCE AND METHOD FOR MANUFACTURING THE SAME

Номер: US20130087257A1
Автор: Hasegawa Kohei, Yoshino Masataka
Принадлежит: JFE STEEL CORPORATION

An ultra.-high-strength cold-rolled steel sheet with excellent ductility and delayed fracture resistance includes 0.15% to 0.75 C. 1.0% to 3.0% Si, 1.5% to 2.5% Mn, 0.05% or less P, 0.02% or less 5, 0.01% to 0.05% Al, and less than 0.005% N on a mass ratio, the remainder being Fe and =avoidable impurities, the ultra-high-strength cold-rolled steel sheet having a metal microstructure including 40% to 85% of a tempered martensite phase and 15% to 60% of a ferrite phase on a volume fraction basis and a tensile strength of 1320 Mtn or more. 1. An ultra-high-strength cold-rolled steel sheet with excellent ductility and delayed fracture resistance , comprising 0.15% to 0.25% C , 1.0% to 3.0% Si , 1.5% to 2.5% Mn , 0.05% or less P , 0.02% or less S , 0.01% to 0.05% Al , and less than 0.005% N on a mass ratio , the remainder being Fe and unavoidable impurities , the ultra-high-strength cold-rolled steel sheet having a microstructure comprising 40% to 85% of a tempered martensite phase and 15% to 60% of a ferrite phase on a volume fraction basis and a tensile strength of 1320 MPa or more.2. The cold-rolled steel sheet according to claim 1 , further comprising one or more of 0.1% or less Nb claim 1 , 0.1% or less Ti claim 1 , and 5 ppm to 30 ppm B on a mass ratio.3. The cold-rolled steel sheet according to claim 1 , having a total elongation of 12% or more.4. A method for manufacturing an ulta-high-strengh cold-rolled steel sheet having excellent ductility and delayed fracture resistance claim 1 , comprising;{'claim-ref': {'@idref': 'CLM-00001', 'claim 1'}, 'heating a steel slab having the chemical composition specified in to 1200° C. or higher;'}hot-rolling the steel slab at a finish rolling end temperature of 800° C. or higher;pickling the steel;cold-rolling the steel;{'sub': 1', '3, 'continuously annealing the steel such that the steel is held at a temperature ranging from the Actransformation temperature to Actransformation temperature thereof for 30 a to 1200 s, cooled ...

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Номер записи: 16
25-04-2013 дата публикации

STEEL FOR MACHINE STRUCTURE EXHIBITING EXCELLENT MACHINABILITY

Номер: US20130101457A1
Автор: Aiso Toshiharu, Kozawa Shuji, Kubota Manabu, Miyanishi Kei, Yoshida Suguru
Принадлежит: NIPPON STEEL & SUMITOMO METAL CORPORATION

This steel for a machine structure contains, in mass %: C: 0.40% to less than 0.75%; Si: 0.01% to 3.0%; Mn: 0.1% to 1.8%; S: 0.001% to 0.1%; Al: more than 0.1% and not more than 1.0%; N: 0.001% to 0.02%; and P: limited to not more than 0.05%, with a balance including Fe and inevitable impurities, in which the steel satisfies 139.38 ≦214×[C]+30.6×[Si]+42.8×[Mn]−14.7×[Al]≦177 and 0.72≦[C]+1/7×[Si]+1/5×[Mn]<1.539. 1. A steel for a machine structure , the steel comprising , in mass %:C: 0.40% to less than 0.75%;Si: 0.01% to 3.0%;Mn: 0.1% to 1.8%;S: 0.001% to 0.1%;Al: more than 0.1% and not more than 1.0%;N: 0.001% to 0.02%; andP: limited to not more than 0.05%,with a balance including Fe and inevitable impurities, wherein [{'br': None, '139.38≦214×[C]+30.6×[Si]+42.8×[Mn]−14.7×[al]≦177\u2003\u2003(1)'}, {'br': None, '0.72≦[C]+1/7×[Si]+1/5×[Mn]<1.539\u2003\u2003(2)'}], 'an amount of C: [C], an amount of Si: [Si], an amount of Mn: [Mn], and an amount of Al: [Al] satisfy following Expression (1) and Expression (2).'}2. The steel for a machine structure according to claim 1 , wherein the steel further satisfies following Expression (3).{'br': None, '113−135×[C]−27×[Mn]≦13\u2003\u2003(3)'}3. The steel for a machine structure according to claim 1 , wherein the steel further satisfies following Expression (4).{'br': None, '55≦33+31×[C]+4.5×[Si]+1.5×[Mn]<72.45\u2003\u2003(4)'}4. The steel for a machine structure according to claim 2 , wherein the steel further satisfies following Expression (4).{'br': None, '55≦33+31×[C]+4.5×[Si]+1.5×[Mn]<72.45\u2003\u2003(4)'}5. The steel for a machine structure according to claim 1 , wherein {'br': None, '1.5<[Si]+1.8×[Mn]<6.24\u2003\u2003(5)'}, 'the steel further satisfies following Expression (5).'}6. The steel for a machine structure according to claim 1 , whereinthe steel further comprises B: 0.0001% to 0.015% in mass %.7. The steel for a machine structure according to claim 1 , whereinthe steel further comprises, in mass %, one or more ...

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Номер записи: 17
16-05-2013 дата публикации

METHOD OF PRODUCING AN AUSTENITIC STEEL

Номер: US20130118647A1
Автор: Berkhout Basjan, Cornelissen Marcus Cornelis Maria, Patel Jayesh Ramjibhai
Принадлежит: TATA STEEL IJMUIDEN BV

A method of producing an austenitic steel strip or sheet excellent in resistance to delayed cracking and a steel produced thereby. 2. Process according to claim 1 , wherein the aluminium content of the work piece is at least 1.25 and/or at most 3.5%.3. Process according to claim 1 , wherein during the cooling at a cooling rate Vafter the continuous annealing the strip or sheet is led through a hot dip bath for providing a metallic coating by hot dipping the strip or sheet into a molten bath of the metal making up the metallic coating.4. Process according to claim 1 , wherein the strip or sheet is pickled after continuous annealing and wherein the strip or sheet is provided with a metallic coating by pickling after annealing followed by heating to a temperature below the continuous annealing temperature before the strip or sheet is led through a hot dip bath for providing a metallic coating by hot dipping the strip or sheet into a molten bath of the metal making up the metallic coating.5. Process according to claim 1 , wherein reduction of the cold-rolling is between 10 to 90%.6. Process according to claim 1 , wherein the annealed strip or sheet is temper rolled with a reduction of from 0.5 to 10% prior to or after the metallic coating has been provided to the strip or sheet.7. Process according to claim 1 , wherein the Vanadium content is between 0.06 and 0.22%.8. Process according to claim 1 , wherein the cooling rate Vis between 20 and 80° C./s.9. Process according to claim 1 , wherein the strip or sheet is pickled after continuous annealing and wherein the strip or sheet is provided with a metallic coating claim 1 , by pickling after continuous annealing followed by heating to a temperature between 400 and 600° C. before the strip or sheet is led through a hot dip bath for providing a metallic coating by hot dipping the strip or sheet into a molten bath of the metal making up the metallic coating.10. Process according to claim 9 , wherein the Fe in the strip or ...

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Номер записи: 18
30-05-2013 дата публикации

STEEL WIRE OF SPECIAL STEEL AND WIRE ROD OF SPECIAL STEEL

Номер: US20130133789A1
Автор: GOTOHDA Hideaki, KAWANA Akifumi, OKONOGI Makoto, YAMASAKI Shingo
Принадлежит:

A predetermined composition is had, when a C content is represented by (C %), in a case of (C %) being not less than 0.35% nor more than 0.65%, a volume fraction of pearlite is 64×(C %)+52% or more, and in a case of (C %) being greater than 0.65% and 0.85% or less, the volume fraction of pearlite is not less than 94% nor more than 100%, and a structure of the other portion is composed of one or two of proeutectoid ferrite and bainite. Further, in a region to a depth of 1.0 mm from a surface, a volume fraction of pearlite block having an aspect ratio of 2.0 or more is not less than 70% nor more than 95%, and a volume fraction of pearlite having an angle between an axial direction and a lamellar direction on a cross section parallel to the axial direction of 40° or less is 60% or more with respect to all pearlite. 1. A steel wire of special steel containing:in mass %;C: 0.35% to 0.85%;Si: 0.05% to 2.0%;Mn: 0.20% to 1.0%; andAl: 0.005% to 0.05%,a P content being 0.030% or less,a S content being 0.030% or less, anda balance being composed of Fe and inevitable impurities, whereinwhen a C content is represented by (C %), in a case of (C %) being not less than 0.35% nor more than 0.65%, a volume fraction of pearlite is 64×(C %)+52% or more, and in a case of (C %) being greater than 0.65% and 0.85% or less, the volume fraction of pearlite is not less than 94% nor more than 100%, and a structure of the other portion is composed of one or two of proeutectoid ferrite or bainite,in a region up to a depth of 1.0 mm from a surface of the steel wire, a volume fraction of pearlite block having an aspect ratio of 2.0 or more is not less than 70% nor more than 95%, and a volume fraction of pearlite having an angle between an axial direction of the steel wire and a lamellar direction of the perlite on a cross section parallel to the axial direction of 40° or less is 60% or more with respect to all pearlite, anda tensile strength is 1200 MPa or more and less than 1500 MPa.2. The steel ...

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Номер записи: 19
30-05-2013 дата публикации

HIGH TENSILE STRENGTH HOT ROLLED STEEL SHEET HAVING EXCELLENT FORMABILITY AND METHOD FOR MANUFACTURING THE SAME

Номер: US20130133790A1
Автор: Ariga Tamako, Mega Tetsuya, Nakajima Katsumi
Принадлежит: JFE STEEL CORPORATION

Described is a high tensile strength hot rolled steel sheet having high strength and formability, and a manufacturing method. It has tensile strength≧980 MPa and excellent formability, and specifically identified ranges by mass % of C, Si, Mn, P, S, N, Al, Ti, V, Solute V, and Solute Ti; (ii) microstructure with fine carbides dispersion precipitated therein, the fine carbides containing Ti and V and having the average particle diameter<10 nm, as well as volume ratio with respect to the entire microstructure≧0.007; and matrix as ferrite phase having area ratio with respect to the entire microstructure≧97%. C, Ti, V, S and N satisfy (1) Ti≧0.08+(N/14×48+S/32×48) and (2) 0.8≦(Ti/48+V/51)/(C/12)≦1.2, where “C”, “Ti”, “V”, “S” and “N” represent contents (mass %) of corresponding elements, respectively. 1. A high tensile strength hot rolled steel sheet having tensile strength of at least 980 MPa and excellent formability , comprising: C: 0.07% to 0.13% (inclusive of 0.07% and 0.13%),', 'Si: 0.3% or less,', 'Mn: 0.5% to 2.0% (inclusive of 0.5% and 2.0%),', 'P: 0.025% or less,', 'S: 0.005% or less,', 'N: 0.0060% or less,', 'Al: 0.06% or less,', 'Ti: 0.08% to 0.14% (inclusive of 0.08% and 0.14%),', 'V: 0.15% to 0.30% (inclusive of 0.15% and 0.30%),', 'Solute V: 0.04% to 0.1% (inclusive of 0.04% and 0.1%),', 'Solute Ti: 0.05% or less, and', 'remainder consisting of Fe and incidental impurities;, 'a composition including by mass %,'}microstructure with fine carbides dispersion precipitated therein, the fine carbides containing Ti and V and having the average particle diameter of less than 10 nm, as well as volume ratio with respect to the entire microstructure of at least 0.007; and [{'br': None, 'Ti≧0.08+(N/14×48+S/32×48)\u2003\u2003(1)'}, {'br': None, '0.8≦(Ti/48+V/51)/(C/12)≦1.2\u2003\u2003(2)'}], 'matrix as ferrite phase having area ratio with respect to the entire microstructure of at least 97%, wherein contents of C, Ti, V, S and N satisfy formula (1) and formula (2) ...

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Номер записи: 20
30-05-2013 дата публикации

High-strength cold rolled sheet having excellent formability and crashworthiness and method for manufacturing the same

Номер: US20130133792A1
Автор: Saiji Matsuoka, Shinjiro Kaneko, Tatsuya Nakagaito, Yoshiyasu Kawasaki
Принадлежит: JFE Steel Corp

A high-strength cold rolled steel sheet has excellent formability and crashworthiness and includes, on a mass % basis, C: 0.05 to 0.3%, Si: 0.3 to 2.5%. Mn: 0.5 to 3.5%, P: 0.003 to 0.100%, 5: 0.02% or less, Al: 0.010 to 0.5%, the balance being iron and unavoidable impurities, the high-strength cold rolled steel sheet having a microstructure including 20% or more of ferrite on an area fraction basis, 10 to 60% of tempered martensite on an area fraction basis, 0 to 10% of martensite on an area fraction basis, and 3 to 15% of retained austenite on a volume fraction basis.

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Номер записи: 21
30-05-2013 дата публикации

Complex metallographic structured high strength steel and method of manufacturing

Номер: US20130136950A1
Автор: Weiping Sun
Принадлежит: Nucor Corp

A multi-phase steel sheet having microstructure having in combination ferrite, martensite of between 3% and 65% by volume, and at least one microstructure selected from the group consisting of, bainite and retained austenite, and having fine complex precipitates selected from the group of TiC, NbC, TiN, NbN, (Ti.Nb)C, (Ti.Nb)N, and (Ti.Nb)(C.N) particles having at least 50% smaller than 20 nm in size, and physical properties having tensile strength greater than about 780 megapascals and at least one of the properties of elongation greater than about 10%, yield ratio greater than about 70%, and hole expansion ratio greater than about 50%.

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Номер записи: 22
06-06-2013 дата публикации

HIGH-STRENGTH STEEL SHEET EXHIBITING EXCELLENT STRETCH-FLANGE FORMABILITY AND BENDING WORKABILITY, AND METHOD OF PRODUCING MOLTEN STEEL FOR THE HIGH-STRENGTH STEEL SHEET

Номер: US20130142688A1
Автор: Haji Junji, Kawano Osamu, Kume Kohsuke, Maeda Daisuki, Suwa Yoshihiro, Takahashi Yuzo, Yamamoto Kenichi, YAMAMURA Hideaki
Принадлежит:

The present invention provides a high-strength steel sheet including: C: 0.03 to 0.25 mass %, Si: 0.1 to 2.0 mass %, Mn: 0.5 to 3.0 mass %, P: not more than 0.05 mass %, T.O: not more than 0.0050 mass %, S: 0.0001 to 0.01 mass %, N: 0.0005 to 0.01 mass %, acid-soluble Al: more than 0.01 mass %, Ca: 0.0005 to 0.0050 mass %, and a total of at least one element of Ce, La, Nd, and Pr: 0.001 to 0.01 mass %, with a balance including iron and inevitable impurities, in which the steel sheet contains a chemical component on a basis of mass that satisfies 0.7<100×([Ce]+[La]+[Nd]+[Pr])/[acid-soluble Al]≦70 and 0.2≦([Ce]+[La]+[Nd]+[Pr])/[S]≦10, the steel sheet contains compound inclusion including a first inclusion phase containing at least one element of Ce, La, Nd, and Pr, containing Ca, and containing at least one element of O and S, and a second inclusion phase having a component different from that of the first inclusion phase and containing at least one element of Mn, Si, and Al, the compound inclusion forms a spherical compound inclusion having an equivalent circle diameter in the range of 0.5 μm to 5 μm, and a ratio of the number of the spherical compound inclusion relative to the number of all inclusions having the equivalent circle diameter in the range of 0.5 μm to 5 μm is 30% or more. 1. A high-strength steel sheet comprising:C: 0.03 to 0.25 mass %,Si: 0.1 to 2.0 mass %,Mn: 0.5 to 3.0 mass %,P: not more than 0.05 mass %,T.O: not more than 0.0050 mass %,S: 0.0001 to 0.01 mass %,N: 0.0005 to 0.01 mass %,acid-soluble Al: more than 0.01 mass %,Ca: 0.0005 to 0.0050 mass %, anda total of at least one element of Ce, La, Nd, and Pr: 0.001 to 0.01 mass %,with a balance including iron and inevitable impurities, wherein: [{'br': None, '0.7<100×([Ce]+[La]+[Nd]+[Pr])/[acid-soluble Al]≦70, and'}, {'br': None, '0.2≦([Ce]+[La]+[Nd]+[Pr])/[S]≦10,'}], 'the steel sheet contains a chemical component on a basis of mass that satisfies'}where [Ce] is an amount of Ce contained, [La] is an ...

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Номер записи: 23
13-06-2013 дата публикации

Method of producing cold-rolled steel sheet as well as cold-rolled steel sheet and members for automobile

Номер: US20130149526A1
Автор: Hiroyuki Masuoka, Satoru Ando, Shunsuke Yamamoto
Принадлежит: JFE Steel Corp

In a method of producing a cold-rolled steel sheet being excellent in not only the phosphate treatability but also the corrosion resistance after coating under severe corrosion environment such as hot salt water immersion test or composite cycle corrosion test, a continuously annealed steel sheet after cold rolling preferably including 0.5-3.0 mass % of Si is pickled to remove a Si-containing oxide layer on a surface layer of the steel sheet and further repickled so that a surface covering ratio of an iron-based oxide on the surface of the steel sheet is not more than 40% and preferably a maximum thickness of the iron-based oxide is not more than 150 nm, as well as a cold-rolled steel sheet produced by this method and a member for automobile using the cold-rolled steel sheet.

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Номер записи: 24
20-06-2013 дата публикации

HOT-ROLLED STEEL SHEET, COLD-ROLLED STEEL SHEET, GALVANIZED STEEL SHEET, AND METHODS OF MANUFACTURING THE SAME

Номер: US20130153091A1
Автор: Fujita Nobuhiro, Hayashi Kunio, Kishimoto Tetsuo, Okamoto Riki, Takahashi Manabu, YOSHIDA Hiroshi
Принадлежит: NIPPON STEEL & SUMITOMO METAL CORPORATION

A hot-rolled steel sheet has an average value of the X-ray random intensity ratio of a {100} <011> to {223} <110> orientation group at least in a sheet thickness central portion that is in a sheet thickness range of ⅝ to ⅜ from a steel sheet surface of 1.0 to 6.0, an X-ray random intensity ratio of a {332} <113> crystal orientation of 1.0 to 5.0, rC which is an r value in a direction perpendicular to a rolling direction of 0.70 to 1.10, and r30 which is an r value in a direction that forms an angle of 30° with respect to the rolling direction of 0.70 to 1.10. 1. A hot-rolled steel sheet comprising , by mass %:C: 0.0001% to 0.40%;Si: 0.001% to 2.5%;Mn: 0.001% to 4.0%;P: 0.001% to 0.15%;S: 0.0005% to 0.03%;Al: 0.001% to 2.0%;N: 0.0005% to 0.01%;O: 0.0005% to 0.01%;and further comprising one or two or more of:Ti: 0.001% to 0.20%;Nb: 0.001% to 0.20%;V: 0.001% to 1.0%;W: 0.001% to 1.0%;B: 0.0001% to 0.0050%;Mo: 0.001% to 1.0%;Cr: 0.001% to 2.0%;Cu: 0.001% to 2.0%;Ni: 0.001% to 2.0%;Co: 0.0001% to 1.0%;Sn: 0.0001% to 0.2%;Zr: 0.0001% to 0.2%;As: 0.0001% to 0.50%;Mg: 0.0001% to 0.010%;Ca: 0.0001% to 0.010%; andREM: 0.0001% to 0.1%;and balance composed of iron and inevitable impurities,wherein an average value of an X-ray random intensity ratio of a {100} <011> to {223}<110> orientation group at least in a sheet thickness central portion that is in a sheet thickness range of ⅝ to ⅜ from a steel sheet surface is 1.0 to 6.0, an X-ray random intensity ratio of a {332} <113> crystal orientation is 1.0 to 5.0; andrC which is an r value in a direction perpendicular to a rolling direction is 0.70 to 1.10, and r30 which is an r value in a direction that forms an angle of 30° with respect to the rolling direction is 0.70 to 1.10.2. The hot-rolled steel sheet according to claim 1 ,wherein rL which is an r value in the rolling direction is 0.70 to 1.10, and r60 which is an r value in a direction that forms an angle of 60° with respect to the rolling direction is 0.70 to 1.10.3. The ...

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Номер записи: 25
27-06-2013 дата публикации

HIGH STRENGTH HOT ROLLED STEEL SHEET HAVING EXCELLENT TOUGHNESS AND METHOD FOR MANUFACTURING THE SAME

Номер: US20130160904A1
Автор: Funakawa Yoshimasa, Moriyasu Noriaki, Murata Takayuki, Nakajima Katsumi, Saito Hayato
Принадлежит:

The steel sheet includes C: 0.04 to 0.12%, Si: 0.5 to 1.2%, Mn: 1.0 to 1.8%, P: not more than 0.03%, S: not more than 0.0030%, Al: 0.005 to 0.20%, N: not more than 0.005% and Ti: 0.03 to 0.13%, the balance being Fe and inevitable impurities, includes a microstructure containing a bainite phase at an area fraction exceeding 95% and having an average grain diameter of not more than 3 μm, has a difference ΔHv1 of not more than 50 between a Vickers hardness value at 50 μm from the surface and a Vickers hardness value at ¼ of a sheet thickness, has a difference ΔHv2 of not more than 40 between the Vickers hardness value at ¼ of the sheet thickness and a Vickers hardness value at ½ of the sheet thickness. 1. A high strength hot rolled steel sheet with excellent toughness , which comprises , in terms of mass % , C: 0.04 to 0.12% , Si: 0.5 to 1.2% , Mn: 1.0 to 1.8% , P: not more than 0.03% , S: not more than 0.0030% , Al: 0.005 to 0.20% , N: not more than 0.005% and Ti: 0.03 to 0.13% , the balance being Fe and inevitable impurities , contains a bainite phase at an area fraction exceeding 95% , the bainite phase having an average grain diameter of not more than 3 μm , has a difference ΔHv1 of not more than 50 between a Vickers hardness value at 50 μm from the surface and a Vickers hardness value at ¼ of a sheet thickness , has a difference ΔHv2 of not more than 40 between the Vickers hardness value at ¼ of the sheet thickness and a Vickers hardness value at ½ of the sheet thickness , the sheet thickness being not less than 4.0 mm and not more than 12 mm , and has a tensile strength of not less than 780 MPa.2. The high strength hot rolled steel sheet with excellent toughness according to claim 1 , wherein the steel sheet further comprises claim 1 , in terms of mass % claim 1 , Ni: 0.01 to 0.50%.3. The high strength hot rolled steel sheet with excellent toughness according to claim 1 , wherein the steel sheet further comprises claim 1 , in terms of mass % claim 1 , one claim 1 ...

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Номер записи: 26
27-06-2013 дата публикации

HIGH STRENGTH COLD ROLLED STEEL SHEET HAVING EXCELLENT STRETCH FLANGEABILITY AND METHOD FOR MANUFACTURING THE SAME

Номер: US20130160907A1
Автор: Kawabe Hidetaka, Nishizawa Masanori, Seto Kazuhiro
Принадлежит:

A steel is subjected to a hot rolling step, a cold rolling step, and an annealing step having a maximum achieving temperature: 800° C. to 900° C., two-step heating, and two-step cooling. The two-step heating includes first-step heating to (maximum achieving temperature—(10° C. to 50° C.)) at an average temperature raising rate: 0.5° C. to 5.0° C./s and second-step heating in which the temperature raising time from that temperature range to the maximum achieving temperature is specified to be 30 to 150 s. Two-step cooling includes first-step cooling to cool from the maximum achieving temperature at a cooling rate of 10° C. to 40° C./s and second-step cooling to cool to a temperature range of 400° C. to 500° C. at a cooling rate of 0.2 to 0.8 times the first-step cooling rate for a cooling time of 0.2 to 0.8 times the total cooling time. 2. The high strength cold rolled steel sheet according to claim 1 , further comprising Ca: 0.0001% to 0.0050% on a percent by mass basis in the composition.4. The method for manufacturing a high strength cold rolled steel sheet according to claim 3 , wherein the steel further contains Ca: 0.0001% to 0.0050% on a percent by mass basis in the composition. This application is the U.S. National Phase application of PCT International Application No. PCT/JP2011/070665, filed Sep. 5, 2011, and claims priority to Japanese Patent Application Nos. 2010-199040, filed Sep. 6, 2010, and 2011-179329, filed Aug. 19, 2011, the disclosures of each of these being incorporated herein by reference in their entireties for all purposes.The present invention relates to a high strength cold rolled steel sheet suitable for use as automobile parts and the like, which are press-formed into complicated shapes. In particular, the present invention relates to an improvement in stretch flangeability. Here, a term “high strength steel sheet” refers to a steel sheet having high strength of a tensile strength: 590 MPa or more. In addition, a term “steel sheet” here ...

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Номер записи: 27
04-07-2013 дата публикации

HIGH-STRENGTH STEEL SHEET AND HIGH-STRENGTH ZINC-COATED STEEL SHEET WHICH HAVE EXCELLENT DUCTILITY AND STRETCH-FLANGEABILITY AND MANUFACTURING METHOD THEREOF

Номер: US20130167980A1
Автор: KAWATA Hiroyuki, Maruyama Naoki, Murasato Akinobu, Suzuki Noriyuki, Wakabayashi Chisato, Yoshinaga Naoki
Принадлежит: NIPPON STEEL & SUMITOMO METAL CORPORATION

This high-strength steel sheet includes by mass percentage: 0.05 to 0.4% of C; 0.1 to 2.5% of Si; 1.0 to 3.5% of Mn; 0.001 to 0.03% of P; 0.0001 to 0.01% of S; 0.001 to 2.5% of Al; 0.0001 to 0.01% of N; 0.0001 to 0.008% of O; and a remainder composed of iron and inevitable impurities, wherein a steel sheet structure contains by volume fraction 10 to 50% of a ferrite phase, 10 to 50% of a tempered martensite phase, and a remaining hard phase, wherein a 98% hardness is 1.5 or more times as high as a 2% hardness in a range from ⅛ to ⅜ of a thickness of the steel sheet, wherein a kurtosis K* of the hardness distribution between the 2% hardness and the 98% hardness is −1.2 to −0.4, and wherein an average crystal grain size in the steel sheet structure is 10 μm or less. 1. A high-strength steel sheet which has an excellent ductility and a stretch-flangeability , the steel sheet comprising by mass percentage:0.05 to 0.4% of C;0.1 to 2.5% of Si;1.0 to 3.5% of Mn;0.001 to 0.03% of P;0.0001 to 0.01% of S;0.001 to 2.5% of Al;0.0001 to 0.01% of N;0.0001 to 0.008% of O; anda remainder composed of iron and inevitable impurities,wherein a steel sheet structure contains by volume fraction 10 to 50% of a ferrite phase, 10 to 50% of a tempered martensite phase, and a remaining hard phase,wherein when a plurality of measurement regions with diameters of 1 μM or less are set in a range from ⅛ to ⅜ of a thickness of the steel sheet, hardness measurement values in the plurality of measurement regions are arranged in ascending order to obtain a hardness distribution, an integer N0.02 which is a number obtained by multiplying a total number of the hardness measurement values by 0.02 and, if present, by rounding up a decimal number, is obtained, a hardness of a measurement value which is an N0.02-th largest value from a smallest hardness measurement value is regarded as a 2% hardness, an integer N0.98 which is a number obtained by multiplying the total number of the hardness measurement ...

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Номер записи: 28
04-07-2013 дата публикации

High strength hot rolled steel sheet having excellent bendability and method for manufacturing the same

Номер: US20130167985A1
Автор: Hayato Saito, Katsumi Nakajima, Noriaki Moriyasu, Takayuki Murata, Yoshimasa Funakawa
Принадлежит: JFE Steel Corp

A steel sheet including C at 0.05 to 0.15%, Si at 0.2 to 1.2%, Mn at 1.0 to 2.0%, P at not more than 0.04%, S at not more than 0.0030%, Al at 0.005 to 0.10%, N at not more than 0.005% and Ti at 0.03 to 0.13%, the balance being Fe and inevitable impurities, includes surface regions having an area fraction of bainite of less than 80% and an area fraction of a ferrite phase with a grain diameter of 2 to 15 μm of not less than 10%, the surface regions extending from both surfaces of the steel sheet each to a depth of 1.5 to 3.0% relative to a total sheet thickness, as well as an inner region other than the surface regions having an area fraction of a bainite phase of more than 95%, and has a tensile strength of not less than 780 MPa.

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Номер записи: 29
11-07-2013 дата публикации

High-Strength Steel Material Having Outstanding Ultra-Low-Temperature Toughness and a Production Method Therefor

Номер: US20130174941A1
Автор: Cho Hyun-Kwan, Choi Jong-Kyo, Jang Woo-Kil, Noh Hee-Goon, Um Kyung-Keun
Принадлежит: POSCO

The present invention provides steel containing manganese and nickel that is used as a structural material for a cryogenic storage container for liquefied natural gas (LNG) or the like, and a manufacturing method thereof; and more particularly, to steel having good cryogenic temperature toughness and also high strength by adding low-cost Mn instead of relatively expensive Ni at an optimized ratio, refining a microstructure through controlled rolling and cooling, and precipitating retained austenite through tempering, and a manufacturing method of the steel. To achieve the object, the technical feature of the present invention is a method of manufacturing high-strength steel with cryogenic temperature toughness. In the method, a steel slab is heated to a temperature within a range of 1,000 to 1,250° C., wherein the steel slab includes, by weight: 0.01-0.06% of carbon (C), 2.0-8.0% of manganese (Mn), 0.01-6.0% of nickel (Ni), 0.02-0.6% of molybdenum (Mo), 0.03-0.5% of silicon (Si), 0.003-0.05% of aluminum (Al), 0.0015-0.01% of nitrogen (N), 0.02% or less of phosphorous (P), 0.01% or less of sulfur (S), with a remainder of iron (Fe) and other unavoidable impurities. Then, the heated slab is finish-rolled at a temperature of 950° C. or less at a rolling reduction rate of 40% or more. The rolled steel is cooled to a temperature of 400° C. or less at a cooling rate of 2° C./s or more. Thereafter, the steel is tempered for 0.5-4 hours to a temperature within a range of 550 to 650° C. after the cooling. 1. High-strength steel with good cryogenic temperature toughness , comprising , by weight: 0.01-0.06% of carbon (C) , 2.0-8.0% of manganese (Mn) , 0.01-6.0% of nickel (Ni) , 0.02-0.60 of molybdenum (Mo) , 0.03-0.5% of silicon (Si) , 0.003-0.050 of aluminum (Al) , 0.0015-0.01% of nitrogen (N) , 0.02% or less of phosphorous (P) , 0.01% or less of sulfur (S) , with a remainder of iron (Fe) and other unavoidable impurities.2. The high-strength steel with good cryogenic ...

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Номер записи: 30
11-07-2013 дата публикации

HIGH STRENGTH STEEL SHEET AND METHOD FOR MANUFACTURING THE SAME

Номер: US20130174946A1
Автор: Fushiwaki Yusuke, Suzuki Yoshitsugu
Принадлежит:

A method for manufacturing such steel sheet includes continuous annealing of a steel sheet which includes, in terms of mass %, C at 0.01 to 0.18%, Si at 0.4 to 2.0%, Mn at 1.0 to 3.0%, Al at 0.001 to 1.0%, P at 0.005 to 0.060% and S at ≦0.01%, the balance being represented by Fe and inevitable impurities, in such a manner that the dew point of the atmosphere is controlled to become not more than −45° C. during the course of soaking when the annealing furnace inside temperature is in the range of not less than 820° C. and not more than 1000° C. as well as that the dew point of the atmosphere is controlled to become not more than −45° C. during the course of cooling when the annealing furnace inside temperature is in the range of not less than 750° C. 1. A method for manufacturing high strength steel sheets , comprising continuous annealing of a steel sheet which includes , in terms of mass % , C at 0.01 to 0.18% , Si at 0.4 to 2.0% , Mn at 1.0 to 3.0% , Al at 0.001 to 1.0% , P at 0.005 to 0.060% and S at ≦0.01% , the balance being represented by Fe and inevitable impurities , in such a manner thatthe dew point of the atmosphere is controlled to become not more than −45° C. during the course of soaking when the annealing furnace inside temperature is in the range of not less than 820° C. and not more than 1000° C. as well as that the dew point of the atmosphere is controlled to become not more than −45° C. during the course of cooling when the annealing furnace inside temperature is in the range of not less than 750° C.2. The method for manufacturing high strength steel sheets according to claim 1 , wherein the chemical composition of the steel sheet further includes one or more elements selected from B at 0.001 to 0.005% claim 1 , Nb at 0.005 to 0.05% claim 1 , Ti at 0.005 to 0.05% claim 1 , Cr at 0.001 to 1.0% claim 1 , Mo at 0.05 to 1.0% claim 1 , Cu at 0.05 to 1.0% and Ni at 0.05 to 1.0% in terms of mass %.3. The method for manufacturing high strength steel sheets ...

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Номер записи: 31
11-07-2013 дата публикации

Ferro-Alloys

Номер: US20130177469A1
Автор: Ruhlman James D., Scherrer Charles, Schudalla Randall W.
Принадлежит:

Methods comprising providing a composition comprising iron and a high melting point element; heating the composition to an elevated temperature up to about 3,500° F.; holding the composition at the elevated temperature for a time sufficient for the heat's temperature to stabilize; and allowing the composition to cool or solidify. Methods comprising providing a master alloy comprising iron and up to about 30% by weight of a high melting point element; and adding the master alloy to a heat of steel. Compositions comprising an alloy of iron and high melting point element in which the alloy is up to about 30% by weight of the high melting point element. Compositions comprising an alloy of iron and high melting point element having a substantially uniform microstructure. 1. A method comprising:providing a composition comprising iron and a high melting point element;heating the composition to an elevated temperature up to about 3,500° F.;holding the composition at the elevated temperature for a time sufficient for the heat's temperature to stabilize; andallowing the composition to cool or solidify.2. The method of claim 1 , wherein the high melting point element is up to about 30% by weight of the composition.3. The method of claim 1 , wherein the high melting point element is one or more of Tungsten (W) claim 1 , Niobium (Ni) claim 1 , Rhenium (Re) claim 1 , Osmium (Os) claim 1 , Tantalum (Ta) claim 1 , Iridium (Ir) claim 1 , Boron (B) claim 1 , Ruthenium (Ru) claim 1 , Hafnium (Hf) claim 1 , Technetium (Tc) claim 1 , Rhodium (Rh) claim 1 , Zirconium (Zr) claim 1 , Platinum (Pt) claim 1 , and Thorium (Th).4. The method of claim 1 , wherein the time sufficient for the heat's temperature to stabilize is between about 1 and 10 hours.5. The method of claim 1 , further comprising adding the master alloy to a heat of steel.6. A method comprising:providing a master alloy comprising iron and up to about 30% by weight of a high melting point element; andadding the master alloy to ...

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Номер записи: 32
25-07-2013 дата публикации

PROFILED STEEL WIRE WITH HIGH MECHANICAL CHARACTERISTICS RESISTANT TO HYDROGEN EMBRITTLEMENT

Номер: US20130186521A1
Автор: Bertout Christophe, Foissey Sylvain, Perroud Xavier
Принадлежит: ARCELOMITTAL WIRE FRANCE

This profiled wire, of NACE grade, made of low-alloy carbon steel intended to be used in the offshore oil exploitation sector, is characterized in that it has the following chemical composition, expressed in percentages by weight of the total mass: 0.75<% C<0.95; 0.30<% Mn<0.85; Cr≦0.4%; V≦0.16%; Si≦1.40% and preferably ≧0.15%; and optionally no more than 0.06% Al, no more than 0.1% Ni and no more than 0.1% Cu, the balance being iron and the inevitable impurities arising from smelting the metal in the liquid state, and in that the steel is obtained, from hot-rolled rod stock cooled down to room temperature, and then having a diameter of about 5 to 30 mm, by subjecting this starting rod firstly to a thermomechanical treatment comprising two successive steps carried out in order, namely an isothermal quench, giving it a homogeneous perlitic microstructure, followed by a mechanical transformation operation carried out cold with an overall degree of work-hardening (or reduction ratio) of between 50 and 80% at most, so as to give the wire its definitive shape, and in that the profiled wire thus obtained is then subjected to a restoration heat treatment of short duration carried out below Ac1 (preferably between 410 and 710° C.), giving it the desired final mechanical properties. 2. A profiled wire according to claim 1 , characterized in that its isothermal quenching is a patenting operation in lead.3. A profiled wire according to claim 1 , characterized in that its recovery treatment is carried out with a temperature of between 410 and 710° C. for a duration not exceeding one minute. The present invention relates to the field of metallurgy dedicated to offshore oil and gas operations. It relates more particularly to steel wires usable as reinforcing or structural elements of components or constructions submerged in deep water, such as the flexible offshore pipelines.It is known that a primary requirement concerning the wires of this type is, in addition to elevated ...

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Номер записи: 33
25-07-2013 дата публикации

HOT-ROLLED STEEL SHEET HAVING EXCELLENT COLD FORMABILITY AND HARDENABILITY AND METHOD FOR MANUFACTURING THE SAME

Номер: US20130186526A1
Автор: Kobayashi Takashi, Mega Tetsuya, Nakamura Nobuyuki
Принадлежит: JFE STEEL CORPORATION

Hot-rolled steel has a chemical composition containing, by mass%, C: 0.18% or more and 0.29% or less, N: 0.0050% or less, Ti: 0.002% or more and 0.05% or less, B: 0.0005% or more and 0.0050% or less, and appropriately controlled amounts of Si, Mn, P, S, Al, and a tensile strength of 500 MPa or less with a variation in tensile strength of 60 MPa or less throughout a region including the edges in the width direction of the steel sheet, and having excellent cold formability and hardenability. 2. The hot-rolled steel sheet according to claim 1 , wherein the chemical composition further comprises claim 1 , by mass% claim 1 , one or both of Nb and V: 0.1% or less in total.3. The hot-rolled steel sheet according to claim 1 , wherein the chemical composition further comprises claim 1 , by mass% claim 1 , one or more of Ni claim 1 , Cr and Mo: 1.5% or less in total.4. The hot-rolled steel sheet according to claim 1 , wherein the chemical composition further comprises claim 1 , by mass% claim 1 , one or both of Sb and Sn: 0.1% or less in total.5. The hot-rolled steel sheet according to claim 1 , wherein the steel sheet has a variation in tensile strength ΔTS of 60 MPa or less throughout a region that is on an inner side 5 mm from edges in a width direction of the steel sheet.6. A method for manufacturing a hot-rolled steel sheet having excellent cold formability and hardenability claim 1 , comprising:hot-rolling a steel having a chemical composition comprising, by mass%, C: 0.18% or more and 0.29% or less, Si: 1% or less, Mn: 1.5% or less, P: 0.1% or less, S: 0.03% or less, sol.Al: 0.1% or less, N: 0.0050% or less, Ti: 0.002% or more and 0.05% or less, B: 0.0005% or more and 0.0050% or less and the balance being Fe and inevitable impurities with a finishing temperature of 800° C. or higher and 900° C. or lower and thereafter,cooling the resulting hot-rolled steel sheet at a mean cooling rate of 20° C/s or less, andcoiling the resulting hot-rolled steel sheet at a coiling ...

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Номер записи: 34
01-08-2013 дата публикации

HIGH STRENGTH STEEL SHEET HAVING EXCELLENT WARM STAMP FORMABILITY AND METHOD FOR MANUFACTURING THE SAME

Номер: US20130192725A1
Автор: Funakawa Yoshimasa
Принадлежит: JFE STEEL CORPORATION

A high strength steel sheet excellent in warm stamp formability and a method for manufacturing the same. The steel has a composition containing, in terms of % by mass, C: 0.01 to 0.2%, Si: 0.5% or lower, Mn: 2% or lower, P: 0.03% or lower, S: 0.01% or lower, Al: 0.07% or lower, and N: 0.01% or lower and further containing one or two or more elements selected from Ti, Nb, V, Mo, W, and B. 1. A high strength steel sheet with excellent warm stamp formability comprising:a matrix, which is substantially a ferrite single phase in which an area ratio of the ferrite phase is 95% or more anda structure in which alloy carbides having a size of lower than 10 nm are dispersed and deposited in the matrix in a state having no variant selection,wherein the sheet has a tensile strength of 590 MPa or more and tensile properties in which strain from an indication of a maximum load to fracture is larger than the strain before the indication of the maximum load from a start of a tensile test carried out at a test temperature of 400° C. or higher and the strain before the indication of the maximum load from the start of tensile test is 40% or more in terms of ratio to a total elongation from the start of tensile test to fracture obtained in a tensile test carried out at a test temperature of lower than 400° C.2. The high strength steel sheet according to claim 1 , having a composition containing claim 1 , in terms of % by mass claim 1 , C: 0.01 to 0.2% claim 1 , Si: 0.5% or lower claim 1 , Mn: 2% or lower claim 1 , P: 0.03% or lower claim 1 , S: 0.01% or lower claim 1 , Al: 0.07% or lower claim 1 , N: 0.01% or lower claim 1 , and one or two or more elements selected from the group consisting of Ti: 0.005 to 0.3% claim 1 , Nb: 0.005 to 0.6% claim 1 , V: 0.005 to 1.0% claim 1 , Mo: 0.005 to 0.5% claim 1 , W: 0.01 to 1.0% claim 1 , and B: 0.0005 to 0.0040% and the balance Fe with inevitable impurities.3. The high strength steel sheet according to claim 1 , wherein the high strength steel ...

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Номер записи: 35
01-08-2013 дата публикации

METHOD OF HOT FORMING A STEEL BLANK AND THE HOT FORMED PART

Номер: US20130192726A1
Автор: CHEN Shangping, Lahaye Christiaan Theodorus Wilhelmus
Принадлежит: Tata Steel IJmuiden B.V.

A method of hot forming a steel blank into an article the method including the following steps: d) cooling a heated steel blank to form an article during hot forming, starting at a starting temperature T above Ar3; to an interrupt temperature T in the range of 400-550° C. at a cooling rate V of at least 25° C./s; e) immediately further cooling the article from the interrupt temperature T to ambient temperature at a cooling rate V of 0.2-10° C./s, wherein the interrupt temperature T and cooling rate V are selected such that the article thus obtained has multiphase microstructure including by volume fraction: 55-90% of bainitic ferrite 5-15% of retained austenite 5-30% martensite. 1. Method of hot forming a steel blank into an article , the method comprising the following steps:{'b': 2', '3', '2, 'd) cooling a heated steel blank to form an article during hot forming, starting at a starting temperature T above Ar3 to an interrupt temperature T in the range of 400-550° C. at a cooling rate V of at least 25° C./s,'} C: 0.15-0.45', 'Si: 0.6-2.5', {'b': 3', '0, 'Mn: 1.0-b .'}, 'Al: 0-1.5', 'Mo: 0-0.5', 'Cr: 0-1.0', 'P: 0.001-0.05', 'S: <0.03', 'Ca: <0.003', 'Ti: <0.1', 'V: <0.1, 'wherein the blank has the following composition in weight %the balance being Fe and inevitable impurities,wherein Si+Al=1.2-2.5%;{'b': 3', '3', '3, 'e) without holding the blank for a predetermined time at a temperature of T immediately further cooling the article from the interrupt temperature T to ambient temperature at a cooling rate V of 0.2-10° C./s,'}{'b': 3', '3', '3', '3, 'claim-text': 55-90% of bainitic ferrite', '5-15% of retained austenite', '5-30% martensite., 'wherein the interrupt temperature T and cooling rate V are selected using the relation that the higher T is the lower V is, such that the article thus obtained has a multiphase microstructure comprising by volume fraction2. Method according to claim 1 , wherein the blank is produced from a steel strip or sheet.3. Method ...

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Номер записи: 36
01-08-2013 дата публикации

STAINLESS STEEL FOIL AND CATALYST CARRIER FOR EXHAUST GAS PURIFYING DEVICE USING THE FOIL

Номер: US20130196172A1
Автор: Fujisawa Mitsuyuki, Fukuda Kunio, Honda Atsutaka, Ishikawa Shin, Kato Yasushi, Mizutani Akito, Ota Hiroki, Ujiro Takumi, Yamaguchi Yasuhiro, Yamashita Hideaki
Принадлежит: JFE STEEL CORPORATION

A stainless steel foil contains, in percent by mass, 0.05% or less of C, 2.0% or less of Si, 1.0% or less of Mn, 0.003% or less of S, 0.05% or less of P, 25.0% to 35.0% of Cr, 0.05% to 0.30% of Ni, 3.0% to 10.0% of Al, 0.10% or less of N, 0.02% or less of Ti, 0.02% or less of Nb, 0.02% or less of Ta, 0.005% to 0.20% of Zr, 0.02% or less of Ce, 0.03% to 0.20% of REM excluding Ce, 0.5% to 6.0% in total of at least one of Mo and W, and the balance being Fe and incidental impurities. 1. A stainless steel foil comprising: in percent by mass , 0.05% or less of C , 2.0% or less of Si , 1.0% or less of Mn , 0.003% or less of S , 0.05% or less of P , 25.0% to 35.0% of Cr , 0.05% to 0.30% of Ni , 3.0% to 10.0% of Al , 0.10% or less of N , 0.02% or less of Ti , 0.02% or less of Nb , 0.02% or less of Ta , 0.005% to 0.20% of Zr , 0.02% or less of Ce , 0.03% to 0.20% of REM excluding Ce , 0.5% to 6.0% in total of at least one of Mo and W , and the balance being Fe and incidental impurities.2. The stainless steel foil according to claim 1 , further comprising in percent by mass claim 1 , 2.5% to 5.0% in total of at least one of Mo and W.3. The stainless steel foil according to claim 1 , further comprising at least one of 0.01% to 0.20% (in percent by mass) of Hf claim 1 , 10 to 300 ppm of Ca claim 1 , and 15 to 300 ppm of Mg (in ppm by mass).4. The stainless steel foil according to claim 1 , further comprising claim 1 , in percent by mass claim 1 , 0.03% to 1.0% of Cu.5. The stainless steel foil according to claim 1 , wherein the foil thickness is 40 μm or more.6. A catalyst carrier for an exhaust gas purifying device comprising the stainless steel foil according to .7. The stainless steel foil according to claim 2 , further comprising at least one of 0.01% to 0.20% (in percent by mass) of Hf claim 2 , 10 to 300 ppm of Ca claim 2 , and 15 to 300 ppm of Mg (in ppm by mass).8. The stainless steel foil according to claim 2 , further comprising claim 2 , in percent by mass claim 2 , 0 ...

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Номер записи: 37
08-08-2013 дата публикации

HIGH STRENGTH HOT-ROLLED STEEL SHEET AND METHOD FOR MANUFACTURING THE SAME

Номер: US20130199678A1
Автор: Kawabe Hidetaka, Kohsaka Noriaki, Seto Kazuhiro, Tanaka Yasushi
Принадлежит: JFE STEEL CORPORATION

A high strength hot-rolled steel sheet with a tensile strength of not less than 590 MPa which exhibits excellent bake hardenability and stretch-flangeability has a chemical composition including, in terms of mass %, C at 0.040 to 0.10%, Si at not more than 0.3%, Mn at 1.7 to 2.5%, P at not more than 0.030%, S at not more than 0.005%, Al at not more than 0.1% and N at 0.006 to 0.025%, and microstructure wherein a bainite phase represents not less than 60%, the total of a ferrite phase and a pearlite phase represents not more than 10%, and the bainite phase includes grains among which cementite grains have been precipitated at not less than 1.4×10grains/mmand the cementite grains have an average grain diameter of not more than 1.5 μm. 1. A high strength hot-rolled steel sheet with a tensile strength of not less than 590 MPa which has a chemical composition comprising , in terms of mass % , C at 0.040 to 0.10% , Si at not more than 0.3% , Mn at 1.7 to 2.5% , P at not more than 0.030% , S at not more than 0.005% , Al at not more than 0.1% and N at 0.006 to 0.025% , with the balance being represented by Fe and inevitable impurities , and has a microstructure in which a bainite phase represents not less than 60% , a total of a ferrite phase and a pearlite phase represents not more than 10% , and the bainite phase includes grains among which cementite grains have been precipitated at not less than 1.4×10grains/mmand the cementite grains have an average grain diameter of not more than 1.5 μm.2. The high strength hot-rolled steel sheet according to claim 1 , further comprising claim 1 , in terms of mass % claim 1 , one claim 1 , or two or more of Cr claim 1 , Mo and Ni at a total content of not more than 0.30%.3. The high strength hot-rolled steel sheet according to claim 1 , further comprising claim 1 , in terms of mass % claim 1 , one claim 1 , or two or more of Nb claim 1 , Ti and V at a total content of not more than 0.010%.4. The high strength hot-rolled steel sheet ...

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Номер записи: 38
08-08-2013 дата публикации

HOT ROLLED THIN CAST STRIP PRODUCT AND METHOD FOR MAKING THE SAME

Номер: US20130202914A1
Автор: EDELMAN Daniel Geoffrey, KILLMORE Christopher Ronald
Принадлежит:

A hot rolled steel strip made by the steps including assembling a twin roll caster, forming a casting pool of molten steel of such composition that the cast strip produced comprises by weight, greater than 0.25% and up to 1.1% carbon, between 0.40 and 2.0% manganese, between 0.05 and 0.50% silicon, less than 0.01% aluminum, counter rotating the casting rolls to solidify metal shells and forming a steel strip, hot rolling the steel strip such that mechanical properties at 10% and 35% reduction are within 10% for yield strength, tensile strength and total elongation, and coiling the hot rolled steel strip at a temperature between 550 and 750° C. to provide a majority of the microstructure comprising pearlite, along with bainite and acicular ferrite. The steel may have a free oxygen content between 5 and 50 ppm or between 25 and 45 ppm. 1. A hot rolled steel strip made by the steps comprising:assembling an internally cooled roll caster having laterally positioned casting rolls forming a nip between them, and forming a casting pool of molten steel supported on the casting rolls above the nip and confined adjacent the ends of the casting rolls by side dams, the molten steel of such composition that hot rolled thin cast strip produced has a composition comprising by weight, greater than 0.25% and up to 1.1% carbon, between 0.5 and 2.0% manganese, between 0.05 and 0.50% silicon, less than 0.01% aluminum,counter rotating the casting rolls to solidify metal shells on the casting rolls as the casting rolls move through the casting pool, andforming from the metal shells downwardly through the nip between the casting rolls a steel strip,hot rolling the steel strip such that mechanical properties at 10% and 35% reduction are within 10% for yield strength, tensile strength and total elongation; andcoiling the hot rolled steel strip at a temperature between 550 and 750° C. to provide a majority of the microstructure comprising pearlite, along with bainite and acicular ferrite in ...

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Номер записи: 39
15-08-2013 дата публикации

HIGH-STRENGTH HOT-ROLLED STEEL SHEET HAVING EXCELLENT FORMABILITY AND METHOD FOR MANUFACTURING THE SAME

Номер: US20130206289A1
Автор: Mega Tetsuya, Mizuno Reiko, Moriyasu Noriaki, Nakajima Katsumi
Принадлежит: JFE STEEL CORPORATION

A high-strength hot-rolled steel sheet having excellent formability has a composition containing, by mass, 0.04% to 0.1% of C, 0.3% to 1.3% of Si, 0.8% to 1.8% of Mn, 0.03% or less of P, 0.005% or less of S, 0.005% or less of N, 0.005% to 0.1% of Al, and at least one element selected from 0.002% to less than 0.03% of Ti, 0.002% to less than 0.03% of V, and 0.002% to less than 0.02% of Nb, the balance being Fe and incidental impurities. The steel sheet has a microstructure in which the area fraction of ferrite phase in the entire structure is 85% or more, the area fraction of bainite phase in the entire structure is 10% or less, the area fraction of phases other than the ferrite and bainite phases in the entire structure is 5% or less, and the area fraction of acicular ferrite phase in the entire ferrite phase is 30% to less than 80%. 1. A high-strength hot-rolled steel sheet having excellent formability , comprising a composition containing , by mass , 0.04% to 0.1% of C , 0.3% to 1.3% of Si , 0.8% to 1.8% of Mn , 0.03% or less of P , 0.005% or less of S , 0.005% or less of N , 0.005% to 0.1% of Al , and at least one element selected from 0.002% to less than 0.03% of Ti , 0.002% to less than 0.03% of V , and 0.002% to less than 0.02% of Nb , the balance being Fe and incidental impurities , the steel sheet having a microstructure in which an area fraction of a ferrite phase in the structure is 85% or more , an area fraction of a bainite phase in the structure is 10% or less , an area fraction of phases other than the ferrite and bainite phases in the structure is 5% or less , and an area fraction of an acicular ferrite phase in the ferrite phase is 30% to less than 80%.2. The steel sheet according to claim 1 , further comprising claim 1 , by mass claim 1 , at least one of 0.0005% to 0.005% of Ca and 0.0005% to 0.03% of REM.3. The steel sheet according to claim 1 , further comprising claim 1 , by mass claim 1 , 0.0002% to 0.005% of B.4. A method of manufacturing a ...

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Номер записи: 40
22-08-2013 дата публикации

HIGH-STRENGTH COLD ROLLED STEEL SHEET HAVING EXCELLENT DEEP DRAWABILITY AND BAKE HARDENABILITY AND METHOD FOR MANUFACTURING THE SAME

Номер: US20130213529A1
Автор: Kimura Hideyuki, Nagataki Yasunobu
Принадлежит: JFE STEEL CORPORATION

A high-strength cold rolled steel sheet having excellent deep drawability and bake hardenability, with a tensile strength ≧440 MPa, an average r-value ≧1.20 and a bake hardening value ≧40 MPa, is obtained by subjecting a steel raw material having a chemical composition including C: 0.010-0.06 mass %, Si: more than 0C:\Users\ejensen\Desktop\!TEMP\.5 mass % but not more than 1.5 mass %, Mn: 1.0-3.0 mass %, Nb: 0.010-0.090 mass %, Ti: 0.015-0.15 mass % and satisfying 2. A high-strength cold rolled steel sheet according to claim 1 , which further contains not more than 0.5 mass % in total of one or more selected from Mo claim 1 , Cr and V in addition to the chemical composition.3. A high-strength cold rolled steel sheet according to claim 1 , which further contains one or two selected from Cu: not more than 0.3 mass % and Ni: not more than 0.3 mass % in addition to the chemical composition.4. A high-strength cold rolled steel sheet according to claim 1 , which further contains one or two selected from Sn: not more than 0.2 mass % and Sb: not more than 0.2 mass % in addition to the chemical composition.7. The method for manufacturing a high-strength cold rolled steel sheet according to claim 6 , wherein the steel raw material further contains not more than 0.5 mass % in total of one or more selected from Mo claim 6 , Cr and V in addition to the chemical composition.8. The method for manufacturing a high-strength cold rolled steel sheet according to claim 6 , wherein the steel raw material further contains one or two selected from Cu: not more than 0.3 mass % and Ni: not more than 0.3 mass % in addition to the chemical composition.9. The method for manufacturing a high-strength cold rolled steel sheet according to claim 6 , wherein the steel raw material further contains one or two selected from Sn: not more than 0.2 mass % and Sb: not more than 0.2 mass % in addition to the above chemical composition.11. The method for manufacturing a high-strength cold rolled steel ...

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Номер записи: 41
22-08-2013 дата публикации

Abrasion resistant steel plate which exhibits excellent weld toughness and excellent delayed fracture resistance

Номер: US20130216422A1
Автор: Keiji Ueda, Shinichi Suzuki
Принадлежит: JFE Steel Corp

Provided is an abrasion-resistant steel plate or sheet which exhibits excellent weld toughness and excellent delayed fracture resistance and is thus suitable for construction machines, industrial machines, and so on. Specifically provided is a steel plate or sheet which contains, in mass %, 0.20 to 0.30% of C, 0.05 to 1.0% of Si, 0.40 to 1.2% of Mn, 0.010% or less of P, 0.005% or less of S, 0.40 to 1.5% of Cr, 0.005 to 0.025% of Nb, 0.005 to 0.03% of Ti, 0.1% or less of Al, 0.01% or less of N, and, as necessary, one or more of Mo, W, B, Cu, Ni, V, REM, Ca and Mg, and has a DI* of 45 to 180 while satisfying the relationship: C+Mn/4−Cr/3+10P≦0.47, and which has a microstructure that comprises martensite as the matrix phase. DI*=33.85×(0.1×C) 0.5 ×(0.7×Si+1)×(3.33×Mn+1)×(0.35×Cu+1)×(0.36×Ni+1)×(2.16×Cr+1)×(3×Mo+1)×(1.75×V+1)×(1.5×W+1)

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Номер записи: 42
22-08-2013 дата публикации

HIGH CARBON STEEL WIRE ROD HAVING EXCELLENT DRAWABILITY

Номер: US20130216423A1
Автор: Oura Hiroshi, Yoshihara Nao
Принадлежит: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)

This high carbon steel wire rod, which has excellent drawability in addition to high strength required for a wire rod, contains 0.6-1.5% of C, 0.1-1.5% of Si, 0.1-1.5% of Mn, 0.02% or less of P (excluding 0%), 0.02% or less of S (excluding 0%), 0.03-0.12% of Ti, 0.001-0.01% of B and 0.001-0.005% of N, with solid-solved B being 0.0002% or more, solid-solved N being 0.0010% or less, and the balance being made up of iron and inevitable impurities. In addition, the content of Ti solid-solved in the steel is 0.002% by mass or more, and the content of Ti that formed carbides is 0.020% by mass or more. 2. The high carbon steel wire rod of claim 1 , further comprising Al in a content of more than 0% and less than or equal to 0.1%.3. The high carbon steel wire rod of claim 1 , further comprising at least one selected from the group consisting of Cr in a content of more than 0% and less than or equal to 0.45%; and/or V in a content of more than 0% and less than or equal to 0.5%. The present invention relates to high carbon steel wire rods which are drawn into wires and then used typically in prestressed concrete wires, suspension bridge cables, and various wire ropes widely used as reinforcing materials for prestressed concrete structures typically of buildings and bridges. More specifically, the present invention relates to high carbon steel wire rods having better drawability.High carbon steel wire rods used typically in prestressed concrete wires, suspension bridge cables, and various wire ropes should have high strengths and satisfactory ductility after wire drawing and, in addition, should have good drawability from the viewpoint of productivity. To meet these requirements, a variety of high quality high carbon steel wire rods have been developed.Typically, Patent Literature (PTL) 1 proposes a technique of improving resistance to hydrogen embrittlement of a wire rod. This technique specifies the contents of Ti in the forms of a nitride, a sulfide, and a carbide in a ...

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Номер записи: 43
12-09-2013 дата публикации

HIGH STRENGTH STEEL SHEET HAVING EXCELLENT FORMABILITY AND METHOD FOR MANUFACTURING THE SAME

Номер: US20130233453A1
Автор: Katayama Noriyuki, Kawabe Hidetaka, KAWAMURA Kenji, Seto Kazuhiro
Принадлежит: JFE STEEL CORPORATION

A thin high strength steel sheet having excellent formability has a composition which includes, by mass %, 0.08 to 0.15% of C, 0.5 to 1.5% of Si, 0.5 to 1.5% of Mn, 0.01 to 0.1% of Al, and 0.005% or less of N to form a hot rolled sheet is conducted. 2. The high strength steel sheet according to claim 1 , wherein the composition further comprises one or more selected from the group consisting of 0.05 to 0.5% of Cr claim 1 , 0.005 to 0.2% of V claim 1 , and 0.005 to 0.2% of Mo by mass %.3. The high strength steel sheet according to claim 1 , wherein the composition further comprises one or two selected from the group consisting of 0.01 to 0.1% of Ti and 0.01 to 0.1% of Nb by mass %.4. The high strength steel sheet according to claim 1 , wherein the composition further comprises 0.0003 to 0.0050% of B by mass %.5. The high strength steel sheet according to claim 1 , wherein the composition further comprises one or both of 0.05 to 0.5% of Ni and 0.05 to 0.5% of Cu by mass %.6. The high strength steel sheet according to claim 1 , wherein the composition further comprises one or both of 0.001 to 0.005% of Ca and 0.001 to 0.005% of REM by mass %.8. The method according to claim 7 , wherein the hot rolling step includes heating the steel at a temperature of 1100° C. to 1280° C. claim 7 , hot-rolling the heated steel with a finish hot rolling temperature of 870° C. to 950° C. to form a hot rolled sheet claim 7 , and coiling the hot rolled sheet at a coiling temperature of 350° C. to 720° C. upon completion of the hot rolling.9. The method according to claim 7 , wherein a cooling time in a temperature region of 700° C. to 550° C. in the second temperature region is 10 s or longer.10. The method according to claim 7 , wherein the composition further comprises one or more selected from the group consisting of 0.05 to 0.5% of Cr claim 7 , 0.005 to 0.2% of V claim 7 , and 0.005 to 0.2% of Mo by mass %.11. The method according to claim 7 , wherein the composition further one or ...

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Номер записи: 44
12-09-2013 дата публикации

Continuous casting method for steel and method for manufacturing steel sheet

Номер: US20130233505A1
Автор: Hiroyuki Ohno, Takeshi Murai, Yuji Miki
Принадлежит: JFE Steel Corp

In a method for continuously casting an extremely low carbon steel using a continuous casting machine, by adjusting the chemical components of extremely low carbon steel within a specified range by taking into account an interface tension gradient in a concentration boundary layer on a front surface of a solidified shell, and also by optimizing intensities of the DC magnetic fields applied to the upper magnetic poles and the lower magnetic poles respectively corresponding to a slab width of a slab to be casted and a casting speed, it is possible to acquire the slab having high quality not only with the small number of defects caused by the entrainment of bubbles, non-metallic inclusion and a mold flux into the molten steel.

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Номер записи: 45
12-09-2013 дата публикации

HIGHLY FORMABLE HIGH-STRENGTH STEEL SHEET, WARM WORKING METHOD, AND WARM-WORKED AUTOMOBILE PART

Номер: US20130236350A1
Автор: Asai Tatsuya, Hata Hideo, Kakiuchi Elijah, MIZUTA Naoki, Murakami Toshio
Принадлежит: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)

A high-strength steel sheet has a chemical composition including 0.05% to 0.3% of C, 1% to 3% of Si, 0.5% to 3% of Mn, 0% to 0.1% of P, 0.001% to 0.1% of Al, and 0.002% to 0.03% of N, in mass percent; further includes iron and impurities; and has a structure including 50% to 90% of bainitic ferrite, 5% to 20% of retained austenite (γ), a total of 10% to 50% of martensite and the retained austenite, and 0% to 40% of polygonal ferrite, in area percent based on the entire structure. The retained austenite has a carbon content (Cγ) of 0.5% to 1.2% by mass, an average equivalent circle diameter of 0.2 to 2 μm, and an average aspect ratio (maximum diameter/minimum diameter) of less than 3.0. The high-strength steel sheet excels both in elongation and deep drawability while having a strength of 980 MPa or more. 2. The highly formable high-strength steel sheet of claim 1 , further comprising group consisting of:Cr in a content of 0.01% to 3%;Mo in a content of 0.01% to 1%;Cu in a content of 0.01% to 2%;Ni in a content of 0.01% to 2%; andB in a content of 0.00001% to 0.01%.3. The highly formable high-strength steel sheet of claim 1 , further comprising at least one element selected from the group consisting of:Ca in a content of 0.0005% to 0.01%;Mg in a content of 0.0005% to 0.01%; anda rare-earth element (REM) in a content of 0.0001% to 0.01%.4. A method of warm-working a high-strength steel sheet claim 1 , the method comprising:{'claim-ref': {'@idref': 'CLM-00001', 'claim 1'}, 'heating the high-strength steel sheet of up to a temperature of 200° C. to 400° C.; and'}working the high-strength steel sheet within 3600 seconds after the heating.5. An automobile part worked by the method of claim 4 , wherein:the automobile part comprises a mixture of at least one region receiving a true strain of 0.05 or more and at least one region receiving a true strain of less than 0.05 upon working; anda difference in yield strength between a region receiving a maximum true strain and a ...

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Номер записи: 46
19-09-2013 дата публикации

Bake-hardenable high-strength cold-rolled steel sheet and method of manufacturing the same

Номер: US20130240094A1
Автор: Masaharu Oka, Satoshi Akamatsu
Принадлежит: Nippon Steel and Sumitomo Metal Corp

The present invention provides a bake-hardenable high-strength cold-rolled steel sheet having excellent bake hardenability, cold aging resistance, and deep-drawability, and reduced planar anisotropy, containing chemical components in % by mass of: C: 0.0010% to 0.0040%, Si: 0.005% to 0.05%, Mn: 0.1% to 0.8%, P: 0.01% to 0.07%, S: 0.001% to 0.01%, Al: 0.01% to 0.08%, N: 0.0010% to 0.0050%, Nb: 0.002% to 0.020%, and Mo: 0.005% to 0.050%, a value of [Mn %]/[P %] being in the range of 1.6 to 45, where [Mn %] is an amount of Mn and [P %] is an amount of P, an amount of C in solid solution obtained from [C %]−(12/93)×[Nb %] being in the range of 0.0005% to 0.0025%, where [C %] is an amount of C and [Nb %] is an amount of Nb, with a balance including Fe and inevitable impurities, wherein the bake-hardenable high-strength cold-rolled steel sheet satisfies the following Equation (1), where X(222), X(110), and X(200) represent ratios of integrated intensity of X-ray diffraction of {222} plane, {110} plane, and {200} plane, respectively, being parallel to a plane located at a depth of ¼ plate thickness measured from the surface of the steel sheet, and the bake-hardenable high-strength cold-rolled steel sheet has tensile strength in the range of 300 MPa to 450 MPa. X (222)/{ X (110)+ X (200)}≧3.0   Equation (1)

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Номер записи: 47
03-10-2013 дата публикации

HIGHLY FORMABLE HIGH-STRENGTH STEEL SHEET, WARM WORKING METHOD, AND WARM-WORKED AUTOMOBILE PART

Номер: US20130259734A1
Автор: Asai Tatsuya, Hata Hideo, Kakiuchi Elijah, MIZUTA Naoki, Murakami Toshio
Принадлежит: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)

A high-strength steel sheet has a chemical composition including 0.05% to 0.3% of C, 1% to 3% of Si, 0.5% to 3% of Mn, 0% to 0.1% of P, 0% to 0.01% of S, 0.001% to 0.1% of Al, and 0.002% to 0.03% of N in mass percent; further includes iron and impurities; and has a structure including 50% to 90% of bainitic ferrite, 3% or more of retained austenite (γ), a total of 10% to 50% of martensite and the retained austenite, and 0% to 40% of polygonal ferrite in area percent based on the entire structure. The retained austenite has a carbon content (Cγ) of 0.5% to 1.2% by mass. The steel sheet includes 0.3% or more of the retained austenite that is surrounded by martensite. The high-strength steel sheet has a strength of 980 MPa or more and exhibits better ductility. 1. A highly formable high-strength steel sheet having a chemical composition comprising:C in a content of from 0.05% to 0.3%;Si in a content of from 1% to 3%;Mn in a content of from 0.5% to 3%;P in a content of from 0% to 0.1%;S in a content of from 0% to 0.01%;Al in a content of from 0.001% to 0.1%; andN in a content of from 0.002% to 0.03%,in mass percent,wherein the steel sheet further comprises iron and impurities;the steel sheet has a structure comprising bainitic ferrite in a content of from 50% to 90%, retained austenite in a content of from 3% or more, a total of martensite and retained austenite in a content of from 10% to 50%, and polygonal ferrite in a content of from 0% to 40%, in area percent, based on an entire structure area;{'sub': 'R', 'the retained austenite has a carbon content (Cγ) of from 0.5% to 1.2% in mass percent; and'}the steel sheet comprises 0.3% or more, in area percent based on the entire structure, of retained austenite that is substantially surrounded by martensite.2. The steel sheet of claim 1 , further comprising claim 1 , as a chemical composition:Cr in a content of from 0.01% to 3%;Mo in a content of from 0.01% to 1%;Cu in a content of from 0.01% to 2%;Ni in a content of from ...

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Номер записи: 48
03-10-2013 дата публикации

Steel plate with excellent hydrogen induced cracking resistance, and manufacturing method of the same

Номер: US20130260164A1
Автор: Hiroki Imamura, Shinsuke Sato, Taku Kato
Принадлежит: Kobe Steel Ltd

A steel plate is provided which has excellent hydrogen induced cracking resistance. The steel plate is suitable for use in a line pipe. The steel plate satisfies a predetermined composition. In a composition of an inclusion contained in the steel and having a width of 1 μm or more, the ratio (RES/CaS) of the mass of an REM sulfide (RES) to that of a Ca sulfide (CaS) is equal to or more than 0.05, a Zr content of the inclusion is in a range of 5 to 60%, and a Nb content of the inclusion is 5% or less.

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Номер записи: 49
10-10-2013 дата публикации

WIRE ROD, STEEL WIRE, AND MANUFACTURING METHOD THEREOF

Номер: US20130263975A1
Автор: Hirakami Daisuke, MANABE Toshiyuki, MUROGA Nariyasu, YAMASAKI Shingo
Принадлежит:

The present invention provides a wire rod with a composition at least including: C: 0.95-1.30 mass %; Si: 0.1-1.5 mass %; Mn: 0.1-1.0 mass %; Al: 0-0.1 mass %; Ti: 0-0.1 mass %; P: 0-0.02 mass %; S: 0-0.02 mass %; N: 10-50 ppm; O: 10-40 ppm; and a balance including Fe and inevitable impurities, wherein 97% or more of an area in a cross-section perpendicular to the longitudinal direction of the wire rod is occupied by a pearlite, and 0.5% or less of an area in a central area in the cross-section and 0.5% or less of an area in a first surface layer area in the cross-section are occupied by a pro-eutectoid cementite. 1. A steel wire obtained by performing at least once a wire drawing and a reheating patenting treatment on a wire rod with a composition including: C: 0.95-1.30 mass %; Si: 0.1-1.5 mass %; Mn: 0.1-1.0 mass %; Al: 0-0.1 mass %; Ti: 0-0.1 mass %; P: 0-0.02 mass %; S: 0-0.02 mass %; N: 10-50 ppm; O: 10-40 ppm; Cr: 0-0.5 mass %; Ni: 0-0.5 mass %; Co: 0-0.5 mass %; V: 0-0.5 mass %; Cu: 0-0.5 mass %; Nb: 0-0.1 mass %; Mo: 0-0.2 mass %; W: 0-0.2 mass %; B: 0-30 ppm; REM: 0-50 ppm; Ca: 0-50 ppm; Mg: 0-50 ppm; Zr: 0-100 ppm; and the balance including Fe and inevitable impurities , in which 97% or more of an area in a cross-section perpendicular to the longitudinal direction of the wire rod is occupied by a pearlite , and 0.5% or less of an area in a central area of the cross-section and 0.5% or less of an area in a first surface layer area in the cross-section are occupied by a pro-eutectoid cementite , wherein:the steel wire has a diameter of 0.1-0.4 mm and a tensile strength of 4200 MPa or higher; and0.5% or less of an area in a second surface layer area in the cross-section perpendicular to the longitudinal direction of the steel wire is occupied by a pro-eutectoid cementite.2. A steel wire obtained by drawing a wire rod with a composition including: C: 0.95-1.30 mass %; Si: 0.1-1.5 mass %; Mn: 0.1-1.0 mass %; Al: 0-0.1 mass %; Ti: 0-0.1 mass %; P: 0-0.02 mass ...

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Номер записи: 50
17-10-2013 дата публикации

Magnetic body

Номер: US20130271249A1
Автор: Kenichi Suzuki, Yoshinori Fujikawa
Принадлежит: TDK Corp

A magnetic body which can reversibly change its magnetic force with a small external magnetic field while having a high residual magnetic flux density is provided. The magnetic body of the present invention has a residual magnetic flux density Br of at least 11 kG and a coercive force HcJ of 5 kOe or less, while an external magnetic field required for the residual magnetic flux density Br to become 0 is 1.10 HcJ or less.

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Номер записи: 51
17-10-2013 дата публикации

STEEL WIRE MATERIAL AND METHOD FOR MANUFACTURING SAME

Номер: US20130272913A1
Автор: Endo Masayuki, Kirihara Kazuhiko, Nakakubo Shohei, Takeda Mikako
Принадлежит: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)

This steel wire material contains 0.05%-1.2% C (“%” means “% by mass,” same hereinafter for chemical components.), 0.01%-0.7% Si, 0.1%-1.5% Mn, 0.02% max. P (not including 0%), 0.02% max. S (not including 0%), and 0.005% max. N (not including 0%), with the remainder being iron and unavoidable impurities. The steel wire material has a scale 6.0-20 μm thick and holes of an equivalent circle diameter of 1 μm max. in said scale that occupy 10% by area max. Said scale does not detach in the cooling process after hot rolling or during storage or transportation but can readily detach during mechanical descaling. 1. A steel wire material , comprising:C in a content by mass of from 0.05 to 1.2%;Si in a content by mass of from 0.01 to 0.7%;Mn in a content by mass of from 0.1 to 1.5%;P in a content by mass of greater than 0% and no more than 0.02%;S in a content by mass of greater than 0% and no more than 0.02%;N in a content by mass of greater than 0% and no more than 0.005%; anda remainder of iron and unavoidable impurities,wherein a scale on a surface of the wire material has a thickness of 6.0 μm or more and 20 μm or less, andholes of an equivalent circle diameter of 1 μm or less are 10% or less by area of the scale.2. The steel wire material according to claim 1 , further comprising Cr in a content by mass of greater than 0% and no more than 0.3% claim 1 , Ni in a content by mass of greater than 0% and no more than 0.3% claim 1 , or both.3. The steel wire material according to claim 1 , further comprising Cu in a content by mass of greater than 0% and no more than 0.3%.4. The steel wire material according to claim 1 , further comprising at least one element selected from a group consisting of Nb claim 1 , V claim 1 , Ti claim 1 , Hf claim 1 , and Zr in a content by mass of greater than 0% and no more than 0.1% in total.5. The steel wire material according to claim 1 , further comprising Al in a content by mass of greater than 0% and no more than 0.1%.6. The steel wire ...

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Номер записи: 52
17-10-2013 дата публикации

STEEL WIRE MATERIAL AND METHOD FOR MANUFACTURING SAME

Номер: US20130272914A1
Автор: Endo Masayuki, Kirihara Kazuhiko, Nakakubo Shohei, Takeda Mikako
Принадлежит: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel. Ltd.)

The steel wire material of the present invention contains 0.05 to 1.2% of C (mass %; same for the chemical components hereafter), 0.01 to 0.5% of Si, 0.1 to 1.5% of Mn, 0.02% or less (but not 0%) of P, 0.02% or less (but not 0%) of S, and 0.005% or less (but not 0%) of N, with the balance being iron and inevitable impurities. The wire material has a scale layer that is no thicker than 7.0 μm or less. The scale layer has an FeO percentage of 30 to 80 vol % and an FeSiOpercentage of less than 0.1 vol %. The scale layer that is formed will not peel when cooled after hot rolling or during storage and transport, but will easily peel during mechanical descaling. 1. A steel wire material comprising , by mass % based on the total mass of the steel wire material:C: 0.05-1.2%;Si: 0.01-0.5%;Mn: 0.1-1.5%;P: 0.02% or less (not including 0%);S: 0.02% or less (not including 0%); andN: 0.005% or less (not including 0%); with the remainder being iron and unavoidable impurities, whereina scale with 7.0 μm or less thickness is included,FeO ratio inside the scale is 30-80 vol %, and{'sub': 2', '4, 'FeSiOratio is less than 0.1 vol %.'}2. The steel wire material according to claim 1 , further comprising claim 1 , by mass % based on the total mass of the steel wire material claim 1 , at least one selected from the group of (1) (2) claim 1 , (3) claim 1 , (4) claim 1 , (5) claim 1 , and (6):(1) Cr: 0.3% or less (not including 0%) and/or Ni: 0.3% or less (not including 0%);(2) Cu: 0.2% or less (not including 0%);(3) At least one element selected from a group consisting of Nb, V, Ti, Hf and Zr by 0.1% or less (not including 0%) in total;(4) Al: 0.1% or less (not including 0%);(5) B: 0.005% or less (not including 0%); and(6) Ca: 0.01% or less (not including 0%) and/or Mg: 0.01% or less (not including 0%).3. A method for manufacturing a steel wire material claim 1 , the method comprising:{'claim-ref': {'@idref': 'CLM-00001', 'claim 1'}, 'hot rolling steel of the chemical composition according ...

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Номер записи: 53
17-10-2013 дата публикации

High-yield-ratio high-strength steel sheet having excellent workability

Номер: US20130273391A1
Автор: Kazuyuki Hamada, Tatsuya Asai
Принадлежит: Kobe Steel Ltd

A steel sheet according to the present invention has tensile strength of 980 MPa or more, exerts a high-yield ratio, and has excellent workability (in detail, strength-ductility balance). The steel sheet contains: C: 0.06-0.12% (excluding 0.12%); Si: 0.2% or less; Mn: 2.0-3.5%; at least one element selected from the group consisting of Ti, Nb, and V of 0.01-0.15% in total; B: 0.0003-0.005%; P: 0.05% or less; S: 0.05% or less; Al: 0.005-0.1%; N: 0.015% or less; and the balance is iron and unavoidable impurities, in which the content of ferrite is more than 5% to 15% or less, that of martensite is 25-55%, and the total content of bainite and tempered martensite is 30% or more to less than 70%, based on the whole microstructure, and in which the average crystal grain size of the ferrite is 3.0 μm or less.

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Номер записи: 54
17-10-2013 дата публикации

Hot-dip galvanized steel sheet and manufacturing method thereof

Номер: US20130273392A1
Автор: Nobuhiro Fujita, Toshiki Nonaka, Toshio Ogawa
Принадлежит: Nippon Steel and Sumitomo Metal Corp

A hot-dip galvanized steel sheet includes a steel sheet and a hot-dip galvanized layer arranged on the steel sheet, in which the Si content and the Al content by mass % of components of the steel sheet satisfy a relationship 0.5<Si+Al<1.0, and a metallographic structure of the steel sheet satisfies a relationship of {(n 2 ) 2/3 ×d 2 }/{(n 1 ) 2/3 ×d 1 }×ln(H 2 /H 1 )<0.3 when the n 1 is the number of a MnS of a surface portion of the steel sheet, the d 1 μm is an average equivalent circle diameter of the MnS in the surface portion of the steel sheet, the H 1 GPa is a hardness of a martensite of the surface portion of the steel sheet, the n 2 is the number of the MnS of a center portion of the steel sheet, the d 2 μm is an average equivalent circle diameter of the MnS in the center portion of the steel sheet, and the H 2 GPa is the hardness of the martensite of the center portion of the steel sheet.

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Номер записи: 55
24-10-2013 дата публикации

HIGH STRENGTH HOT ROLLED STEEL SHEET HAVING EXCELLENT FATIGUE RESISTANCE AND METHOD FOR MANUFACTURING THE SAME

Номер: US20130276940A1
Автор: Funakawa Yoshimasa, Moriyasu Noriaki, Murata Takayuki, Nakajima Katsumi, Saito Hayato
Принадлежит: JFE STEEL CORPORATION

A steel having a composition that includes C: 0.05 to 0.15%, Si: 0.2 to 1.2%, Mn: 1.0 to 2.0%, Al: 0.005 to 0.10%, N: 0.006% or less, and at least one selected from Ti: 0.03 to 0.13%, Nb: 0.02 to 0.10%, and V: 0.02 to 0.15% is subjected to rough rolling at a reduction of 80% or more and finish rolling at a finish rolling delivery temperature in the range of 800 to 950° C. The finish rolled sheet is subjected to cooling including cooling the finish rolled sheet from the finish rolling delivery temperature to a cooling end temperature in the range of 550 to 610° C. at an average cooling rate of 25° C./sec. or more and cooling the finish rolled sheet from the cooling end temperature of the previous process to a coiling temperature at an average cooling rate of 100° C./sec. or more. 1. A high strength hot rolled steel sheet having excellent fatigue resistance and a composition containing , in terms of mass % ,C: 0.05 to 0.15%, Si: 0.2 to 1.2%,Mn: 1.0 to 2.0%, P: 0.03% or less,S: 0.0030% or less, Al: 0.005 to 0.10%, 'and at least one selected from Ti: 0.03 to 0.13%, Nb: 0.02 to 0.10%, and V: 0.02 to 0.15%, the balance being Fe and unavoidable impurities, wherein a surface layer portion having a depth of 500 μm from the surface in the sheet thickness direction contains 50% or more of a bainite phase in terms of area fraction, the bainite phase having an average grain diameter of 5 μm or less; a sheet thickness center portion that extends from a position located at a depth of ¼ of the sheet thickness to a position located at a depth of ¾ of the sheet thickness contains 90% or more of a bainite phase in terms of area fraction, the bainite phase having an average grain diameter of 4 μm or less; and a tensile strength TS is 780 MPa or more.', 'N: 0.006% or less,'}2. The high strength hot rolled steel sheet according to claim 1 , wherein claim 1 , in addition to the composition claim 1 , at least one selected from Cr: 0.01 to 0.2% claim 1 , Mo: 0.005 to 0.2% claim 1 , Cu: 0. ...

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Номер записи: 56
24-10-2013 дата публикации

ALLOY COMPOSITION, FE-BASED NANO-CRYSTALLINE ALLOY AND FORMING METHOD OF THE SAME AND MAGNETIC COMPONENT

Номер: US20130278366A1
Автор: MAKINO Akihiro
Принадлежит:

An alloy composition of the formula FeBSiPCu. Parameters meet the following conditions: 79≦a≦86 atomic %; 5≦b≦13 atomic %; 0 Подробнее

Номер записи: 57
31-10-2013 дата публикации

Multi-Phase Steel, Cold-Rolled Flat Product Produced from Such a Multi-Phase Steel and Method for Producing It

Номер: US20130284321A1
Автор: Bocharova Ekaterina, Krizan Daniel, Mattissen Dorothea, Pichler Andreas, Sebald Roland
Принадлежит: THYSSENKRUPP STEEL EUROPE AG

A multi-phase steel including in % wt. C: 0.14-0.25%, Mn: 1.7-2.5%, Si: 0.2-0.7%, Al: 0.5-1.5%, Cr: <0.1%, Mo: <0.05%, Nb: 0.02-0.06%, S: up to 0.01%, P: up to 0.02%, N: up to 0.01% and optionally at least one of Ti, B, and V according to the following stipulation: Ti: up to 0.1%, B: up to 0.002%, V: up to 0.15%, with the remainder iron and unavoidable impurities, wherein the microstructure has at least 10% vol. ferrite and at least 6% vol. residual austenite and the steel has a tensile strength Rof at least 950 MPa, a yield point Rof at least 500 MPa and an elongation at break Ameasured in the transverse direction of at least 15%. A method of producing the multi-phase steel. 1. A multi-phase steel comprising (in % wt.)C: 0.14-0.25%Mn: 1.7-2.5%Si: 0.2-0.7%Al: 0.5-1.5%Cr: <0.1%Mo: <0.05%Nb: 0.02-0.06%S: up to 0.01%P: up to 0.02%N: up to 0.01%and optionally at least one element from the group Ti, B, and V according to the following stipulation:Ti: up to 0.1B: up to 0.002%V: up to 0.15%{'sub': m', 'eL', '80, 'with the remainder iron and unavoidable impurities, wherein in the microstructure of the steel at least 10% vol. ferrite and at least 6% vol. residual austenite are present and the steel has a tensile strength Rof at least 950 MPa, a yield point Rof at least 500 MPa and an elongation at break Ameasured in the transverse direction of at least 15%.'}2. The multi-phase steel according to claim 1 , wherein the Ccontent of the residual austenite calculated according to formula [1] is more than 0.6% wt.:{'br': None, 'sub': inRA', 'RA', 'γ, 'i': a', '−a, 'C=()/0.0044\u2003\u2003[1]'}{'sub': 'γ', 'with a: 0.3578 nm (the lattice constant of the austenite);'}{'sub': 'RA', 'a: the lattice parameter of the residual austenite in the finished multi-phase steel after final cooling in nm.'}3. A multi-phase steel according to claim 2 , wherein the multi-phase steel has a grade Gof the residual austenite calculated according to formula [2] claim 2 , for which G>6 applies:{'br': ...

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Номер записи: 58
31-10-2013 дата публикации

Steel Sheet for an Oil Sand Slurry Pipe Having Excellent Abrasion Resistance, Corrosion Resistance, and Low-Temperature Toughness and Method for Manufacturing Same

Номер: US20130284324A1
Автор: JUNG Hwan-Gyo, KOH Seong-Ung
Принадлежит: POSCO

Provided is a steel sheet for an oil sand slurry pipe having excellent abrasion resistance, corrosion resistance, and low-temperature toughness including 0.2 wt % to 0.35 wt % of carbon (C), 0.1 wt % to 0.5 wt % of silicon (Si), 0.5 wt % to 1.8 wt % of manganese (Mn), 0.1 wt % to 0.6 wt % of nickel (Ni), 0.005 wt % to 0.05 wt % of niobium (Nb), 0.005 wt % to 0.02 wt % of titanium (Ti), 0.03 wt % or less of phosphorous (P), 0.03 wt % or less of sulfur (S), 0.05 wt % or less (excluding 0 wt %) of aluminum (Al), 0.01 wt % or less (excluding 0 wt %) of nitrogen (N), and iron (Fe) as well as other unavoidable impurities as a remainder. 1. A steel sheet for an oil sand slurry pipe having excellent abrasion resistance , corrosion resistance , and low-temperature toughness , the steel sheet comprising:0.2 wt % to 0.35 wt % of carbon (C);0.1 wt % to 0.5 wt % of silicon (Si);0.5 wt % to 1.8 wt % of manganese (Mn);0.1 wt % to 0.6 wt % of nickel (Ni);0.005 wt % to 0.05 wt % of niobium (Nb);0.005 wt % to 0.02 wt % of titanium (Ti);0.03 wt % or less of phosphorous (P);0.03 wt % or less of sulfur (S);0.05 wt % or less (excluding 0 wt %) of aluminum (Al);0.01 wt % or less (excluding 0 wt %) of nitrogen (N); andiron (Fe) as well as other unavoidable impurities as a remainder.2. The steel sheet for an oil sand slurry pipe having excellent abrasion resistance claim 1 , corrosion resistance claim 1 , and low-temperature toughness of claim 1 , further comprising 0.1 wt % to 1.0 wt % or less (excluding 0 wt %) of chromium (Cr) claim 1 ,wherein a sum of Mn and Cr is 2 wt % or less.3. The steel sheet for an oil sand slurry pipe having excellent abrasion resistance claim 2 , corrosion resistance claim 2 , and low-temperature toughness of claim 2 , wherein a sum of Mn claim 2 , Cr claim 2 , and Ni in the steel sheet is 2.5 wt % or less.4. The steel sheet for an oil sand slurry pipe having excellent abrasion resistance claim 1 , corrosion resistance claim 1 , and low-temperature toughness of ...

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Номер записи: 59
07-11-2013 дата публикации

High-Strength Steel Sheet Having Superior Toughness at Cryogenic Temperatures, and Method for Manufacturing Same

Номер: US20130292011A1
Автор: BANG Ki-Hyun, KIM Sang-Ho, Kim Woo-Gyeom, Suh In-Shik
Принадлежит: POSCO

According to one aspect, provided is a high-strength steel sheet having superior toughness at cryogenic temperature, comprising, in weight percentage, 0.02 to 0.06% of C, 0.1 to 0.35% of Si, 1.0 to 1.6% of Mn, 0.02% or less (but not 0%) of Al, 0.7 to 2.0% of Ni, 0.4 to 0.9% of Cu, 0.003 to 0.015% of Ti, 0.003 to 0.02% of Nb, 0.01% or less of P, 0.005% or less of S, the remainder being Fe and unavoidable impurities, wherein the high-strength steel sheet satisfies the condition of [Mn]+5.4[Si]+26[Al]+32.8[Nb]<4.3 where [Mn], [Si], [Al], and [Nb] indicate contents of Mn, Si, Al, and Nb in weight percentage, respectively. The steel sheet secures toughness when used as structural steel materials for ships, offshore structures, or the like, or steel materials for tanks for storing and carrying liquefied gases, which are exposed to an extreme low temperature environment. 1. A high-strength steel sheet having superior toughness at extreme low temperatures , comprising , in weight percentage , 0.02 to 0.06% of C , 0.1 to 0.35% of Si , 1.0 to 1.6% of Mn , 0.02% or less (but not 0%) of Al , 0.7 to 2.0% of Ni , 0.4 to 0.9% of Cu , 0.003 to 0.015% of Ti , 0.003 to 0.02% of Nb , 0.01% or less of P , 0.005% or less of S , the remainder being Fe and unavoidable impurities , wherein the high-strength steel sheet satisfies the condition of [Mn]+5.4[Si]+26[Al]+32.8[Nb]<4.3 where [Mn] , [Si] , [Al] , and [Nb] indicate contents of Mn , Si , Al , and Nb in weight percentage , respectively.2. The high-strength steel sheet of claim 1 , wherein the microstructure of the steel sheet comprises claim 1 , in area percentage claim 1 , 99% or more of acicular ferrite and 1% or less austenite/martensite (M&A).3. The high-strength steel sheet of claim 2 , wherein effective grains having a grain boundary orientation not less than 15° are not less than 70% in area percentage in the microstructure and the grains having a size of not more than 10 μm in the effective grains are not less than 70% in area ...

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Номер записи: 60
07-11-2013 дата публикации

Steel Sheet for Formed Member Having Enhanced Ductility, Formed Member, and Method for Manufacturing the Formed Member

Номер: US20130295402A1
Автор: Cho Yeol-Rae, KIM Ki-soo, KWAK Jai-Hyun, Oh Jin-Keun
Принадлежит: POSCO

Provided is a steel sheet for a formed member having enhanced ductility, a formed member, and a method for manufacturing the formed member, and more particularly, to a steel sheet for making a formed member having high strength and ductility such as an automotive structural member and a reinforcing member, a formed member, and a method for manufacturing the formed member. The steel sheet for a formed member has enhanced ductility, and includes, by weight %, C: 0.1% to 1.0%, Si+Al: 0.4% to 3.0%, Mn: 0.1% to 5.0%, P: 0.0001% to 0.1%, S: 0.0001% to 0.03%, N: 0.03% or less (but not 0%), and the balance of Fe and inevitable impurities. The formed member having high strength and ductility that can be used for forming an automotive structural member, a reinforcing member, etc. In addition, the formed member can be used for a heat-treatable impact resistant member. 1. A steel sheet for a formed member having enhanced ductility , the steel sheet comprising , by weight% , C: 0.1% to 1.0% , Si+Al: 0.4% to 3.0% , Mn: 0.1% to 5.0% , P: 0.0001% to 0.1% , S: 0.0001% to 0.03% , N: 0.03% or less but not 0% , and the balance of Fe and inevitable impurities.2. The steel sheet of claim 1 , further comprising at least one selected from the group consisting of (a) claim 1 , (b) claim 1 , (c) claim 1 , (d) claim 1 , and (e) claim 1 , wherein:(a) at least one selected from the group consisting of Cr: 0.01% to 2.0%, Mo: 0.01% to 2.0%, and W: 0.01% to 2.0%;(b) at least one selected from the group consisting of Ti: 0.001% to 0.4%, Nb: 0.001% to 0.4%, Zr: 0.001% to 0.4%, and V: 0.001% to 0.4%;(c) at least one of Cu: 0.005% to 2.0% and Ni: 0.005% to 2.0%;(d) B: 0.0001% to 0.01%; and(e) Sb: 0.001% to 0.1%.3. The steel sheet of claim 1 , wherein the steel sheet is one of a hot-rolled steel sheet claim 1 , a cold-rolled steel sheet claim 1 , and a plated steel sheet.4. The steel sheet of claim 3 , wherein the plated steel sheet is a hot-rolled or cold-rolled steel sheet on which a metal or resin ...

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Номер записи: 61
07-11-2013 дата публикации

Austenitic, Lightweight, High-Strength Steel Sheet Having High Yield Ratio and Ductility, and Method for Producing the Same

Номер: US20130295409A1
Автор: CHIN Kwang-Geun, HAN Sang-Ho, KWAK Jai-Hyun
Принадлежит: POSCO

Provided is an austenitic, lightweight, high-strength steel sheet having a high yield ratio and ductility and a method for producing the same, and more particularly, to a high-strength steel sheet for automotive interior panels, exterior panels, and structural parts, and a method for producing the steel sheet. The steel sheet may be a hot-rolled steel sheet, a cold-rolled steel sheet, or a plated steel sheet. The steel sheet includes, by weight %, C: 0.6% to 1.0%, Si: 0.1% to 2.5%, Mn: 10% to 15%, P: 0.02% or less, S: 0.015% or less, Al: 5% to 8%, Ti: 0.01% to 0.20%, N: 0.02% or less, and the balance of Fe and inevitable impurities, wherein the steel sheet has a specific gravity of 7.4 g/cmand a Mn/Al ratio of 2 to 3. 1. An austenitic , lightweight , high-strength steel sheet having a high yield ratio and ductility , the steel sheet comprising , by weight % , C: 0.6% to 1.0% , Si: 0.1% to 2.5% , Mn: 10% to 15% , P: 0.02% or less , S: 0.015% or less , Al: 5% to 8% , Ti: 0.01% to 0.20% , N: 0.02% or less , and the balance of Fe and inevitable impurities , wherein the steel sheet has a specific gravity of 7.4 g/cmand a Mn/Al ratio of 2 to 3.2. The steel sheet of claim 1 , wherein the steel sheet is one of a hot-rolled steel sheet claim 1 , a cold-rolled steel sheet claim 1 , and a plated steel sheet.3. The steel sheet of claim 2 , further comprising at least one selected from the group consisting of Cr: 0.1% to 3.0% claim 2 , Ni: 0.05% to 2.0% claim 2 , Cu: 0.1% to 2.0% claim 2 , and Mo: 0.05% to 0.5%.4. The steel sheet of claim 2 , further comprising at least one selected from the group consisting of V: 0.005% to 0.5% claim 2 , Nb: 0.005% to 0.2% claim 2 , Zr: 0.005% to 0.2% claim 2 , and B: 0.0005% to 0.0030%.5. The steel sheet of claim 2 , further comprising one or two selected from the group consisting of Sb: 0.005% to 0.2% and Ca: 0.001% to 0.02%.6. The steel sheet of claim 4 , further comprising one or two selected from the group consisting of Sb: 0.005% to 0.2% ...

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Номер записи: 62
14-11-2013 дата публикации

HIGH CARBON STEEL WIRE ROD EXCELLENT IN DRAWABILITY AND FATIGUE CHARACTERISTICS AFTER WIRE DRAWING

Номер: US20130302204A1
Автор: Hasegawa Hajime, Kiyose Akihito, Kudou Kouichi, YAMADA Wataru, YAMASAKI Shingo
Принадлежит: NIPPON STEEL & SUMITOMO METAL CORPORATION

High performance high carbon wire with refined inclusions after wire rolling, extremely low wire breakage rates at the time of drawing even in tough applications, and excellent in fatigue characteristics after wire drawing, characterized by having a predetermined composition of ingredients and in that the number ratio of inclusions satisfying (% SiO)=40 to 95%, (% CaO)=0.5 to 30%, (% AlO)=0.5 to 30%, (% MgO)=0.5 to 20%, and (% MnO)=0.5 to 10% and further satisfying (% Na)=0.2 to 7% and (% F)=0.17 to 8% (below, referred to as “inclusions covered due to composition”) in the oxide-based nonmetallic inclusions of a short axis of 0.5 μm or more, a long axis of 1.0 μm or more, and a circle equivalent diameter (area converted to diameter) of 1 μm or more which are seen in the L direction cross-section of the wire (below, referred to as “inclusions covered due to size”), that is, the number of inclusions covered due to composition/number of inclusions covered due to size×100, is 80% or more. 1. High carbon steel wire rod excellent in drawability and the fatigue characteristics after wire drawing which contains , by mass % ,C: 0.5 to 1.2%,Si: 0.15 to 2.5%,Mn: 0.20 to 0.9%,P≦0.025%S: 0.004 to 0.025%,Al: 0.000005 to 0.002%,Ca: 0.00001 to 0.002%,Mg: 0.00001 to 0.001%,Na: 0.000005 to 0.001%, andF: 0.000003 to 0.001%,has a total oxygen amount of 16 to 30 ppm, and which has a balance of Fe and unavoidable impurities,{'sub': 2', '2', '3', '2', '2', '3', '2', '2', '3, 'the high carbon steel wire characterized in that the number ratio of inclusions satisfying (% SiO)=40 to 95%, (% CaO)=0.5 to 30%, (% AlO)=0.5 to 30%, (% MgO)=0.5 to 20%, and (% MnO)=0.5 to 10% and further satisfying (% Na)=0.2 to 7% and (% F)=0.17 to 8% (below, referred to as “inclusions covered due to composition”) in the oxide-based nonmetallic inclusions of a short axis of 0.5 μm or more, a long axis of 1.0 μm or more, and a circle equivalent diameter (area converted to diameter) of 1 μm or more which are seen in ...

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Номер записи: 63
28-11-2013 дата публикации

Weld metal excellent in hydrogen embrittlement resistance

Номер: US20130315777A1
Автор: Hidenori Nako, Munenobu SATO, Takuya Kochi, Wataru Urushihara, Yoshihiko Kitagawa
Принадлежит: Kobe Steel Ltd

Disclosed is a weld metal which is formed by gas-shielded arc welding using a flux-cored wire, and which has a specific chemical composition, in which retained austenite particles are present in a number density of 2500 per square millimeter or more and in a total volume fraction of 4.0% or more based on the total volume of entire structures of the weld metal. The weld metal has excellent hydrogen embrittlement resistance and is resistant to cracking at low temperatures even when the weld metal has a high strength.

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Номер записи: 64
05-12-2013 дата публикации

BAINITE-CONTAINING-TYPE HIGH-STRENGTH HOT-ROLLED STEEL SHEET HAVING EXCELLENT ISOTROPIC WORKABILITY AND MANUFACTURING METHOD THEREOF

Номер: US20130319582A1
Автор: Fujita Nobuhiro, Nakano Kazuaki, Okamoto Riki, Shuto Hiroshi, YAMAMOTO Takeshi, Yokoi Tatsuo
Принадлежит: NIPPON STEEL & SUMITOMO METAL CORPORATION

The present invention provides a bainite-containing-type high-strength hot-rolled steel sheet. The steel sheet, containing C: greater than 0.07 to 0.2%, Si: 0.001 to 2.5%, Mn: 0.01 to 4%, P: 0.15% or less, S: 0.03% or less, N: 0.01% or less, Al: 0.001 to 2% and a balance being composed of Fe and impurities, has an average value of pole densities of the {100}<011> to {223}<110> orientation group at a sheet thickness center portion being a range of ⅝ to ⅜ in sheet thickness from the surface of the steel sheet is 4.0 or less, and a pole density of the {332}<113> crystal orientation is 4.8 or less, an average crystal grain diameter is 10 μm or less and vTrs is −20° C. or lower, and a microstructure is composed of 35% or less in a structural fraction of pro-eutectoid ferrite and a balance of a low-temperature transformation generating phase. 1. A bainite-containing-type high-strength hot-rolled steel sheet having excellent isotropic workability , comprising:in mass %,C: greater than 0.07 to 0.2%;Si: 0.001 to 2.5%;Mn: 0.01 to 4%;P: 0.15% or less (not including 0%);S: 0.03% or less (not including 0%);N: 0.01% or less (not including 0%);Al: 0.001 to 2%; anda balance being composed of Fe and inevitable impurities, whereinan average value of pole densities of the {100}<011> to {223}<110> orientation group represented by respective crystal orientations of {100}<011>, {116}<110>, {114}<110>, {113}<110>, {112}<110>, {335}<110>, and {223}<110> at a sheet thickness center portion being a range of ⅝ to ⅜ in sheet thickness from the surface of the steel sheet is 4.0 or less, and a pole density of the {332}<113> crystal orientation is 4.8 or less,an average crystal grain diameter is 10 μm or less and a Charpy fracture appearance transition temperature vTrs is −20° C. or lower, anda microstructure is composed of 35% or less in a structural fraction of pro-eutectoid ferrite and a balance of a low-temperature transformation generating phase.2. The bainite-containing-type high-strength ...

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Номер записи: 65
05-12-2013 дата публикации

HOT-ROLLED STEEL SHEET AND METHOD OF PRODUCING THE SAME

Номер: US20130323112A1
Автор: Fujita Nobuhiro, Hayashi Kunio, Kishimoto Tetsuo, Nakano Kazuaki, Okamoto Riki, Takahashi Manabu, YAMAMOTO Takeshi
Принадлежит: NIPPON STEEL & SUMITOMO METAL CORPORATION

In a hot-rolled sheet, an average value of pole densities of an orientation group {100}<011> to {223}<110>, which is represented by an arithmetic mean of pole densities of orientations {100}<011>, {116}<110>, {114}<110>, {112}<110>, and {223}<110> in a thickness center portion of a thickness range of ⅝ to ⅜ from a surface of the steel sheet, is 1.0 to 6.5 and a pole density of a crystal orientation {332}<113> is 1.0 to 5.0; and a Lankford value rC in a direction perpendicular to a rolling direction is 0.70 to 1.10 and a Lankford value r in a direction that forms 30° with respect to the rolling direction is 0.70 to 1.10. 1. A hot-rolled steel sheet comprising , by mass % ,C: a content [C] of 0.0001% to 0.40%,Si: a content [Si] of 0.001% to 2.5%,Mn: a content [Mn] of 0.001% to 4.0%,P: a content [P] of 0.001% to 0.15%,S: a content [S] of 0.0005% to 0.10%,Al: a content [Al] of 0.001% to 2.0%,N: a content [N] of 0.0005% to 0.01%,0: a content [O] of 0.0005% to 0.01%, anda balance consisting of iron and unavoidable impurities,wherein a plurality of crystal grains are present in a metallographic structure of the steel sheet;an average value of pole densities of an orientation group {100}<011> to {223}<110>, which is represented by an arithmetic mean of pole densities of orientations {100}<011>, {116}<110>, {114}<110>, {112}<110>, and {223}<110> in a thickness center portion of a thickness range of ⅝ to ⅜ from a surface of the steel sheet, is 1.0 to 6.5 and a pole density of a crystal orientation {332}<113> is 1.0 to 5.0; and{'b': '30', 'a Lankford value rC in a direction perpendicular to a rolling direction is 0.70 to 1.10 and a Lankford value r in a direction that forms 30° with respect to the rolling direction is 0.70 to 1.10.'}2. The hot-rolled steel sheet according to claim 1 ,wherein a volume average grain size of the crystal grains is 2 μm to 15 μm.3. The hot-rolled steel sheet according to claim 1 ,wherein the average value of the pole densities of the orientation ...

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Номер записи: 66
26-12-2013 дата публикации

HIGH-STRENGTH COLD-ROLLED STEEL SHEET WITH HIGH YIELD RATIO HAVING EXCELLENT FORMABILITY AND METHOD FOR PRODUCING THE SAME

Номер: US20130340898A1
Автор: Hasegawa Kohei, Takashima Katsutoshi, Toji Yuki
Принадлежит: JFE STEEL CORPORATION

Provided are a high-strength cold-rolled steel sheet having excellent formability, excellent ductility, excellent hole expansibility, and high yield ratio and a method for producing the same. The high-strength cold-rolled steel sheet contains 0.05% to 0.15% C, 0.10% to 0.90% Si, 1.0% to 2.0% Mn, 0.005% to 0.05% P, 0.0050% or less S, 0.01% to 0.10% Al, 0.0050% or less N, and 0.010% to 0.100% Nb, which are chemical components, on a mass basis, the balance being Fe and unavoidable impurities; has a microstructure which is a multi-phase structure containing 90% or more of a ferrite phase and 0.5% to less than 5.0% of a martensite phase on a volume fraction basis, the remainder being low-temperature transformation phases; and has a yield ratio of 70% or more. 1. A high-strength cold-rolled steel sheet with high yield ratio having excellent formability , having a chemical composition containing 0.05% to 0.15% C , 0.10% to 0.90% Si , 1.0% to 2.0% Mn , 0.005% to 0.05% P , 0.0050% or less S , 0.01% to 0.10% Al , 0.0050% or less N , and 0.010% to 0.100% Nb , on a mass basis , the balance being Fe and unavoidable impurities , the high-strength cold-rolled steel sheet having a microstructure which is a multi-phase structure containing 90% or more of a ferrite phase and 0.5% to less than 5.0% of a martensite phase on a volume fraction basis , the remainder being low-temperature transformation phases , and the high-strength cold-rolled steel sheet having a yield ratio of 70% or more.2. The high-strength cold-rolled steel sheet according to claim 1 , containing Nb-containing precipitates having an average grain size of 0.10 μm or less.3. The high-strength cold-rolled steel sheet according to claim 1 , further containing at least one selected from the group consisting of 0.10% or less V and 0.10% or less Ti on a mass basis instead of a portion of the Fe component.4. The high-strength cold-rolled steel sheet according to claim 1 , further containing at least one selected from the ...

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Номер записи: 67
02-01-2014 дата публикации

COLD-ROLLED STEEL SHEET AND PRODUCTION METHOD THEREOF

Номер: US20140000765A1
Автор: Fujita Nobuhiro, Nozaki Takayuki, Takahashi Manabu, Watanabe Shinichiro, YAMAMOTO Takeshi, YOSHIDA Hiroshi
Принадлежит:

This is a cold-rolled steel sheet includes, by mass %, C: 0.02% to 0.4%, Si: 0.001% to 2.5%, Mn: 0.001% to 4.0%, and Al: 0.001% to 2.0%. The sum of the Si content and the Al content is 1.0% to 4.5%. An average pole density of an orientation group from {100}<011> to {223}<110> is 1.0 to 6.5, and a pole density of a crystal orientation {332}<113> is 1.0 to 5.0. A microstructure includes, by an area ratio %, 5% to 80% of ferrite, 5% to 80% of bainite, and 2% to 30% of retained austenite. In the microstructure, by an area ratio %, martensite is limited to 20% or less, pearlite is limited to 10% or less, and tempered martensite is limited to 60% or less. 1. A cold-rolled steel sheet comprising a steel sheet chemical composition including , by mass % ,C: 0.02% to 0.4%,Si: 0.001% to 2.5%,Mn: 0.001% to 4.0%,Al: 0.001% to 2.0%,P: limited to 0.15% or less,S: limited to 0.03% or less,N: limited to 0.01% or less,O: limited to 0.01% or less, andthe balance consisting of Fe and unavoidable impurities,wherein a sum of the Si content and the Al content is 1.0% to 4.5% in the chemical composition of the steel sheet,an average pole density of an orientation group from {100}<011> to {223}<110>, which is a pole density expressed by an arithmetic average of pole densities of respective crystal orientations {100}<011>, {116}<110>, {114}<110>, {112}<110>, and {223}<110>, is 1.0 to 6.5, and a pole density of a crystal orientation {332}<113> is 1.0 to 5.0 in a sheet thickness central portion within a range of ⅝ to ⅜ of a sheet thickness,a microstructure of the steel sheet includes a plurality of grains,the microstructure of the steel sheet includes, by an area ratio, 5% to 80% of ferrite, 5% to 80% of bainite, and 2% to 30% of retained austenite, in the microstructure, martensite is limited to 20% or less, pearlite is limited to 10% or less, and tempered martensite is limited to 60% or less, andrC that is a Lankford value in a direction orthogonal to a rolling direction is 0.70 to 1.10, and ...

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Номер записи: 68
02-01-2014 дата публикации

HOT-ROLLED STEEL SHEET WITH EXCELLENT PRESS FORMABILITY AND PRODUCTION METHOD THEREOF

Номер: US20140000766A1
Автор: Kawano Osamu, Maeda Daisuke, Otsuka Kazuya
Принадлежит:

The issue of the present invention is to provide a hot-rolled steel sheet with excellent press formability and method for producing the steel sheet, wherein the steel sheet has not only hole expandability but also stretch flanging workability by not assessing hole expandability for stretch flanging as conventional but an actual phenomena of side-bend elongation. 2. The hot-rolled steel sheet with excellent press formability as set force in claim 1 , wherein said steel sheet further comprises one or more of claim 1 , in mass % claim 1 ,Nb: 0.08% or less,Ti: 0.2% or less,V: 0.2% or less,W: 0.5% or less,Mo: 0.4% or less,Cu: 1.2% or less,Ni: 0.6% or less,Cr: 1.0% or less,B: 0.005% or less,Ca: 0.01% or less, andREM: 0.01% or less.3. The hot-rolled steel sheet with excellent press formability as set force in or claim 1 , wherein in said steel sheet claim 1 , the X-ray random intensity ratios of {211} plane parallel to a surface of the steel sheet at the ½ thickness position claim 1 , the ¼ thickness position and the ⅛ thickness position in the thickness direction from the surface are 1.5 or less claim 1 , 1.3 or less claim 1 , and 1.1 or less claim 1 , respectively.5. The method for producing a hot-rolled steel sheet with excellent press formability as set force in claim 4 , wherein the total pass-to-pass time of final 4 stands in said finish rolling is 3 seconds or less.6. The method for producing a hot-rolled steel sheet with excellent press formability as set force in or claim 4 , wherein said slab further comprises one or more of claim 4 , in mass % claim 4 ,Nb: 0.08% or less,Ti: 0.2% or less,V: 0.2% or less,W: 0.5% or less,Mo: 0.4% or less,Cu: 1.2% or less,Ni: 0.6% or less,Cr: 1.0% or less,B: 0.005% or less,Ca: 0.01% or less, andREM: 0.01% or less. The present invention relates to a hot-rolled steel sheet with excellent press formability suitable for an automobile, and a production method thereof.Recently, due to growing worldwide awareness of the environment, it has ...

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Номер записи: 69
02-01-2014 дата публикации

STEEL WIRE ROD AND METHOD OF PRODUCING SAME

Номер: US20140000767A1
Автор: Hikita Naoshi, MANABE Toshiyuki, YAMASAKI Shingo
Принадлежит:

A steel wire rod which is a material of steel wires includes, as a metallographic structure, by area %, 95% to 100% of a pearlite, wherein an average pearlite block size at a central portion of the steel wire rod is 1 μm to 25 μm, an average pearlite block size at a surface layer portion of the steel wire rod is 1 μm to 20 μm, and, when a minimum lamellar spacing of the pearlite at the central portion of the steel wire rod is S in unit of nm and when a distance from a peripheral surface of the steel wire rod to a center is r in unit of mm, S<12 r+65 is satisfied. 1. A steel wire rod comprising , as a chemical composition , by mass %:0.70% to 1.00% of C;0.15% to 0.60% of Si;0.1% to 1.0% of Mn;0.001% to 0.005% of N;0.005% to less than 0.050% of Ni;at least one of 0.005% to 0.10% of Al and 0.005% to 0.10% of Ti; anda balance consisting of iron and unavoidable impurities, andas a metallographic structure, by area %, 95% to 100% of a pearlite,wherein, when a distance from a peripheral surface to a center is r in unit of mm, an average pearlite block size at a central portion which is an area from the center to r×0.99 is 1 μm to 25 μm,an average pearlite block size at a surface layer portion which is an area from the peripheral surface to r×0.01 is 1 μm to 20 μm, and {'br': None, 'i': 'S<', '12 r+65\u2003\u2003(Expression 1)'}, 'when a minimum lamellar spacing of the pearlite at the central portion is S in unit of nm, a following Expression 1 is satisfied.'}2. The steel wire rod according to claim 1 , further comprising claim 1 , as the chemical composition claim 1 , by mass % claim 1 , at least one ofmore than 0% to 0.50% of Cr,more than 0% to 0.50% of Co,more than 0% to 0.50% of V,more than 0% to 0.20% of Cu,more than 0% to 0.10% of Nb,more than 0% to 0.20% of Mo,more than 0% to 0.20% of W,more than 0% to 0.0030% of B,more than 0% to 0.0050% of Rare Earth Metal,more than 0.0005% to 0.0050% of Ca,more than 0.0005% to 0.0050% of Mg, andmore than 0.0005% to 0.010% of Zr.3. ...

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Номер записи: 70
02-01-2014 дата публикации

HOT ROLLED STEEL SHEET AND METHOD OF PRODUCING SAME

Номер: US20140000769A1
Автор: Haji Junji, Kawano Osamu, Takahashi Yuzo
Принадлежит: NIPPON STEEL & SUMITOMO METAL CORPORATION

A hot rolled steel sheet includes, as a chemical composition, at least one selected from Ti, REM, and Ca, and includes, as a metallographic structure, a ferrite as a primary phase, at least one of a martensite and a residual austenite as a secondary phase, and plural inclusions, wherein a total length in the rolling direction of both inclusion-cluster whose length in the rolling direction is 30 μm or more and independent-inclusion whose length in the rolling direction is 30 μm or more is 0 mm to 0.25 mm per 1 mm. 1. A hot rolled steel sheet comprising , 0.03% to 0.1% of C,', '0.5% to 3.0% of Mn,', 'at least one of Si and Al so as to satisfy a condition of 0.5%≦Si+Al≦4.0%,', 'limited to 0.1% or less of P,', 'limited to 0.01% or less of S,', 'limited to 0.02% or less of N,', 'at least one selected from 0.001% to 0.3% of Ti, 0.0001% to 0.02% of Rare Earth Metal, and 0.0001% to 0.01% of Ca, and', 'a balance consisting of Fe and unavoidable impurities, and, 'as a chemical composition, by mass %,'} a ferrite as a primary phase,', 'at least one of a martensite and a residual austenite as a secondary phase, and', 'plural inclusions,, 'as a metallographic structure,'}wherein: amounts expressed in mass % of each element in the chemical composition satisfy a following Expression 1;an average grain size of the ferrite which is the primary phase is 2 μm to 10 μm;an area fraction of the ferrite which is the primary phase is 90% to 99%;an area fraction of the martensite and the residual austenite which are the secondary phase is 1% to 10% in total;{'b': '30', 'sup': '2', 'when a cross section whose normal direction corresponds to a transverse direction of the steel sheet is observed at of visual fields by 0.0025 mm, an average of a maximum of a ratio of a major axis to a minor axis of each of the inclusions in each of the visual fields is 1.0 to 8.0;'}{'sup': '2', 'when a group of inclusions in which a major axis of each of the inclusions is 3 μm or more and an interval in a ...

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Номер записи: 71
02-01-2014 дата публикации

HIGH THERMAL DIFFUSIVITY AND HIGH WEAR RESISTANCE TOOL STEEL

Номер: US20140000770A1
Автор: VALLS ANGLÉS Isaac
Принадлежит: ROVALMA, S.A.

A tool steel family with outstanding thermal diffusivity, hardness and wear resistance has been developed, also exhibiting good hardenability. Also its mechanical strength, as well as its yield strength, at ambient and high temperature (superior to 600° C.) are high, due to a high alloying level in spite of the high thermal conductivity. Because of its high thermal conductivity and good toughness, steels of this invention have also good resistance to thermal fatigue and thermal shock. This steels are ideal for discontinuous processes where it is interesting to reduce cycle time and that require high hardness and/or wear resistance (plastic injection molding, other plastic forming processes and curing of thermosets, hot forming of sheet . . . ). These tool steels are also appropriate for processes requiring high wear resistance and good resistance to thermal fatigue (forging, hot stamping, light-alloy injection . . . ). 2. A steel according to claim 1 , wherein:{'br': None, 'sub': 'eq', 'when % Cis <0.35,then K>0.75,or'}{'br': None, 'sub': 'eq', 'when % Cis >=0.35,then K>0.84,or'}{'br': None, 'sub': 'eq', 'when % Cis >=0.35,then % Hf+% Zr+% Ta+% Nb>=0.01,'}{'br': None, 'being{'br': None, 'sub': eq', 'eq(real), 'K=% C/(0.4+(% Mo−4)*0.04173),and'}{'br': None, 'sub': 'eq(real)', '% Mo=% Mo+0.52*% W.'}3. A steel according to claim 1 , wherein:{'br': None, 'sub': 'eq(real)', '% Mo>3.3%.'}4. A steel according to claim 1 , wherein:{'br': None, '% V+% Nb+% Hf+% Zr>0.1.'}5. A steel according to claim 1 , wherein:{'br': None, '% V+% Nb+% Hf+% Zr>1.2.'}6. A steel according to claim 1 , wherein:{'br': None, 'sub': 'eq', '% Cis >0.32 and % C>0.32.'}7. A steel according to claim 1 , wherein:{'br': None, 'sub': 'eq', '% C>0.36.'}8. A steel according to claim 1 , wherein:{'br': None, '% C>0.4.'}9. A steel according to claim 1 , wherein:{'br': None, '% Mo+½·% W<10.0.'}10. A steel according to claim 1 , wherein:{'br': None, '% Mo+½·% W<4.5 with % Mo=0-4.5 and % W=0-9.'}11. A steel ...

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Номер записи: 72
02-01-2014 дата публикации

STEEL SHEET FOR HOT STAMPED MEMBER AND METHOD OF PRODUCTION OF SAME

Номер: US20140004378A1
Автор: Maki Jun, TANAHASHI Hiroyuki
Принадлежит: NIPPON STEEL & SUMITOMO METAL CORPORATION

A steel sheet for obtaining a member which is excellent in fatigue characteristics equal to ordinary high strength steel sheet of the same strength even if applying the hot stamping process and a method of production of the same are provided. 1. Steel sheet for a hot stamped member which includes composition which contains , by mass % ,C: 0.15 to 0.35%,Si: 0.01 to 1.0%,Mn: 0.3 to 2.3%,Al: 0.01 to 0.5%, anda balance of Fe and unavoidable impurities, and limit the impurities toP: 0.03% or less,S: 0.02% or less, andN: 0.1% or less,wherein a standard deviation of Vicker's hardness at a position of 20 μm from the steel sheet surface in the sheet thickness direction is 20 or less.2. The steel sheet for a hot stamped member as set forth in which further contains claim 1 , by mass % claim 1 , one or more of elements selected fromCr: 0.01 to 2.0%,Ti: 0.001 to 0.5%,Nb: 0.001 to 0.5%B: 0.0005 to 0.01%,Mo: 0.01 to 1.0%W: 0.01 to 0.5%,V: 0.01 to 0.5%,Cu: 0.01 to 1.0%, andNi: 0.01 to 5.0%.3. The steel sheet for a hot stamped member as set forth in which has on the surface of said steel sheet one of a 5 μm to 50 μm thick Al plating layer claim 1 , a 5 μm to 30 μm thick galvanized layer claim 1 , or a 5 μm to 45 μm thick Zn—Fe alloy layer.4. A method of production of steel sheet for a hot stamped member comprising recrystallization-annealing cold rolled steel sheet which includes composition which contains claim 1 , by mass % claim 1 ,C: 0.15 to 0.35%,Si: 0.01 to 1.0%,Mn: 0.3 to 2.3%,Al: 0.01 to 0.5%, anda balance of Fe and unavoidable impurities, and limit the impurities toP: 0.03% or less,S: 0.02% or less, andN: 0.1% or less,in which step, includinga first stage of heating by an average heating rate of 8 to 25° C./sec from room temperature to a temperature M (° C.) andthen a second stage of heating by an average heating rate of 1 to 7° C./sec to a temperature S (° C.),wherein the temperature M (° C.) is 600 to 700 (° C.) and the temperature S (° C.) is 720 to 820 (° C.).5. The ...

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Номер записи: 73
09-01-2014 дата публикации

HIGH STRENGTH HOT ROLLED STEEL SHEET HAVING EXCELLENT BLANKING WORKABILITY AND METHOD FOR MANUFACTURING THE SAME

Номер: US20140007993A1
Автор: Funakawa Yoshimasa, Moriyasu Noriaki, Murata Takayuki, Nakajima Katsumi, Saito Hayato
Принадлежит: JFE STEEL CORPORATION

A high strength hot rolled steel sheet having excellent blanking workability is provided. The composition contains C: 0.050 to 0.15%, Si: 0.1 to 1.5%, Mn: 1.0 to 2.0%, P: 0.03% or less, S: 0.0030% or less, Al: 0.01 to 0.08%, Ti: 0.05 to 0.15%, N: 0.005% or less, and the balance being Fe and unavoidable impurities. More than 95% of the microstructure is formed of a bainite phase in terms of area fraction. Average grain diameters of the bainite phase in a region having a thickness equal to ¼ of the sheet thickness from the surface in the sheet thickness direction is 5 μm or less in an L-direction cross section and 4 μm or less in a C-direction cross section. The number of crystal grains extended in the rolling direction and having an aspect ratio of 5 or more is 7 or less in a sheet thickness center portion. 1. A high strength hot rolled steel sheet having excellent blanking workability and a tensile strength TS of 780 MPa or more , wherein the high strength hot rolled steel sheet has a composition that includes , in terms of mass % ,C: 0.050 to 0.15%, Si: 0.1 to 1.5%,Mn: 1.0 to 2.0%, P: 0.03% or less,S: 0.0030% or less, Al: 0.01 to 0.08%,Ti: 0.05 to 0.15%, N: 0.005% or less, andthe balance being Fe and unavoidable impurities,and a microstructure, more than 95% of which is formed of a bainite phase in terms of area fraction throughout the entire region in a thickness direction, wherein average grain diameters of the bainite phase in a region having a thickness equal to ¼ of the sheet thickness from the surface in the sheet thickness direction is 5 μm or less in a sheet thickness cross section taken in a direction parallel to a rolling direction and 4 μm or less in a sheet thickness cross section taken in a direction perpendicular to the rolling direction, and wherein the number of crystal grains extended in the rolling direction and having an aspect ratio of 5 or more is 7 or less in a region having a thickness equal to 1/10 of the sheet thickness with its center at ...

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Номер записи: 74
16-01-2014 дата публикации

HOT-ROLLED STEEL SHEET AND PRODUCTION METHOD THEREOF

Номер: US20140014236A1
Автор: Fujita Nobuhiro, Nozaki Takayuki, Okamoto Riki, Sano Kohichi, Takahashi Manabu, Wakabayashi Chisato, Watanabe Shinichiro, YAMAMOTO Takeshi, YOSHIDA Hiroshi
Принадлежит: NIPPON STEEL & SUMITOMO METAL CORPORATION

Disclosed is a hot-rolled steel sheet including, by mass %, C:0.02% to 0.5% of C, and the sum of the content of Si and the content of Al is 1.0% to 4.0%. An average pole density of an orientation group from {100}<011> to {223}<110> is 1.0 to 6.5, and a pole density of a crystal orientation {332}<113> is 1.0 to 5.0. A microstructure includes, by of an area ratio, 2% to 30% of retained austenite, 20% to 50% of ferrite, and 10% to 60% of bainite. rC that is a Lankford value in a direction orthogonal to a rolling direction is 0.70 to 1.10, and r30 that is a Lankford value in a direction forming an angle of 30° with the rolling direction is 0.70 to 1.10. 1. A hot-rolled steel sheet being a steel sheet having a chemical composition , by mass % , ofC: 0.02% to 0.5%,Si: 0.001% to 4.0%,Mn: 0.001% to 4.0%,Al: 0.001% to 4.0%,P: 0.15% or less,S: 0.03% or less,N: 0.01% or less,O: 0.01% or less,and the balance consisting of Fe and unavoidable impurities,wherein a sum of a content of the Si and a content of the Al is 1.0% to 4.0% in the chemical composition of the steel sheet,an average pole density of an orientation group from {100}<011> to {223}<110>, which is a pole density expressed by an arithmetic average of pole densities of respective crystal orientations {100}<011>, {116}<110>, {114}<110>, {112}<110>, and {223}<110>, is 1.0 to 6.5, and a pole density of a crystal orientation {332}<113> is 1.0 to 5.0 in a sheet thickness central portion within a range of ⅝ to ⅜ of a sheet thickness,a microstructure of the steel sheet includes a plurality of grains,the microstructure of the steel sheet includes, by an area ratio, 2% to 30% of retained austenite, 20% to 50% of ferrite, 10% to 60% of bainite, 20% or less of pearlite, and 20% or less of martensite, andrC that is a Lankford value in a direction orthogonal to a rolling direction is 0.70 to 1.10, and r30 that is a Lankford value in a direction forming an angle of 30° with the rolling direction is 0.70 to 1.10.2. The hot-rolled ...

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Номер записи: 75
16-01-2014 дата публикации

HOT-ROLLED STEEL SHEET AND METHOD OF PRODUCING THE SAME

Номер: US20140014237A1
Автор: Fujita Nobuhiro, Nakano Kazuaki, Okamoto Riki, Shuto Hiroshi, YAMAMOTO Takeshi, Yokoi Tatsuo
Принадлежит: NIPPON STEEL & SUMITOMO METAL CORPORATION

In a hot-rolled steel sheet, an average pole density of an orientation group {100}<011> to {223}<110>, which is represented by an arithmetic mean of pole densities of orientations {100}<011>, {116}<110>, {114}<110>, {112}<110>, and {223}<110> is 1.0 to 4.0 and a pole density of a crystal orientation {332}<113> is 1.0 to 4.8, in a thickness center portion which is a thickness range of ⅝ to ⅜ from the surface of the steel sheet; an average grain size in the thickness center portion is less than or equal to 10 μm and a grain size of cementite precipitating in a grain boundary of the steel sheet is less than or equal to 2 μm; and an average grain size of precipitates containing TiC in grains is less than or equal to 3 nm and a number density per unit volume is greater than or equal to 1×10grains/cm. 1. A hot-rolled steel sheet comprising , by mass % ,C: a content [C] of 0.02% to 0.07%,Si: a content [Si] of 0.001% to 2.5%,Mn: a content [Mn] of 0.01% to 4%,Al: a content [Al] of 0.001% to 2%,Ti: a content [Ti] of 0.015% to 0.2%,P: a limited content [P] of 0.15% or less,S: a limited content [S] of 0.03% or less,N: a limited content [N] of 0.01% or less, andthe balance consisting of Fe and unavoidable impurities,wherein the contents [Ti], [N], [S], and [C] satisfy the following expressions (a) and (b);an average pole density of an orientation group {100}<011> to {223}<110>, which is represented by an arithmetic mean of pole densities of orientations {100}<011>, {116}<110>, {114}<110>, {112}<110>, and {223}<110> is 1.0 to 4.0 and a pole density of a crystal orientation {332}<113> is 1.0 to 4.8, in a thickness center portion which is a thickness range of ⅝ to ⅜ from the surface of the steel sheet;an average grain size in the thickness center portion is less than or equal to 10 μm and a grain size of a cementite precipitating in a grain boundary in the steel sheet is less than or equal to 2 μm; and{'sup': 16', '3, 'claim-text': [{'br': None, '0%≦[Ti]−[N]×48/14−[S]×48/32)\u2003\ ...

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Номер записи: 76
30-01-2014 дата публикации

HOT-ROLLED STEEL SHEET FOR GAS NITROCARBURIZING AND MANUFACTURING METHOD THEREOF

Номер: US20140027022A1
Автор: Fujita Nobuhiro, Nakano Kazuaki, Okamoto Riki, Shuto Hiroshi, YAMAMOTO Takeshi, Yokoi Tatsuo
Принадлежит:

In a hot-rolled steel sheet, an average pole density of an orientation group of {100}<011> to {223}<110>, which is represented by an arithmetic average of pole density of each orientation of {100}<011>, {116}<110>, {114}<110>, {112}<110>, and {223}<110> in a center portion of a sheet thickness which is a range of the sheet thickness of ⅝ to ⅜ from a surface of the steel sheet, is 1.0 or more and 4.0 or less, the pole density of a crystal orientation of {332}<113> is 1.0 or more and 4.8 or less, an average grain size in a center in the sheet thickness is 10 μM or less, and a microstructure includes, by a structural fraction, pearlite more than 6% and ferrite in the balance. 1. A hot-rolled steel sheet for gas nitrocarburizing comprising , by mass % ,C content [C]: C of more than 0.07% and equal to or less than 0.2%,Si content [Si]: Si of 0.001% or more and 2.5% or less,Mn content [Mn]: Mn of 0.01% or more and 4% or less, andAl content [Al]: Al of 0.001% or more and 2% or less,P content [P] limited to 0.15% or less,S content [S] limited to 0.03% or less, andN content [N] limited to 0.01% or less,Ti content [Ti] which satisfies the following Equation 1, andthe balance consisting of Fe and unavoidable impurities,wherein an average pole density of an orientation group of {100}<011> to {223}<110>, which is represented by an arithmetic average of a pole density of each orientation of {100}<011>, {116}<110>, {114}<110>, {112}<110>, and {223}<110> is 1.0 or more and 4.0 or less, and a pole density of a crystal orientation of {332}<113> is 1.0 or more and 4.8 or less, in a center portion of a sheet thickness which is a range of the sheet thickness of ⅝ to ⅜ from a surface of the steel sheet,wherein an average grain size in a center in the sheet thickness is 10 μm or less, and {'br': None, '0.005+[N]×48/14+[S]×48/32≦Ti≦0.015+[N]×48/14+[S]×48/32\u2003\u2003(1)'}, 'wherein a microstructure includes, by a structural fraction, pearlite of more than 6% and ferrite in the balance.'} ...

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Номер записи: 77
30-01-2014 дата публикации

HIGH-STRENGTH COLD-ROLLED STEEL SHEET HAVING EXCELLENT LOCAL DEFORMABILITY AND MANUFACTURING METHOD THEREOF

Номер: US20140030546A1
Автор: Fujita Nobuhiro, Hayashi Kunio, Nakano Kazuaki, Okamoto Riki, Sano Kohichi, Suwa Yoshihiro
Принадлежит: NIPPON STEEL & SUMITOMO METAL CORPORATION

This high-strength cold-rolled steel sheet contains, in mass %, C: 0.02% to 0.20%; Si: 0.001% to 2.5%; Mn: 0.01% to 4.0%; P: 0.001% to 0.15%; S: 0.0005% to 0.03%; Al: 0.001% to 2.0%; N: 0.0005% to 0.01%; and O: 0.0005% to 0.01%; in which Si+Al is limited to less than 1.0%, and a balance being composed of iron and inevitable impurities, in which an area ratio of bainite in a metal structure is 95% or more, at a sheet thickness center portion being a range of ⅝ to ⅜ in sheet thickness from the surface of the steel sheet, an average value of pole densities of the {100}<011> to {223}<110> orientation group is 4.0 or less, and a pole density of the {332}<113> crystal orientation is 5.0 or less, and a mean volume diameter of crystal grains in the metal structure is 7 μm or less. 1. A high-strength cold-rolled steel sheet having excellent local deformability comprising:in mass %,C: not less than 0.02% nor more than 0.20%;Si: not less than 0.001% nor more than 2.5%;Mn: not less than 0.01% nor more than 4.0%;P: not less than 0.001% nor more than 0.15%;S: not less than 0.0005% nor more than 0.03%;Al: not less than 0.001% nor more than 2.0%;N: not less than 0.0005% nor more than 0.01%; and0: not less than 0.0005% nor more than 0.01%; in which Si+Al is limited to less than 1.0%, anda balance being composed of iron and inevitable impurities, wherein an area ratio of bainite in a metal structure is 95% or more,at a sheet thickness center portion being a range of ⅝ to ⅜ in sheet thickness from the surface of the steel sheet, an average value of pole densities of the {100}<011> to {223}<110> orientation group represented by respective crystal orientations of {100}<011>, {116 }<110>, {114}<110>, {113}<110>, {112}<110>, {335}<110>, and {223}<110> is 4.0 or less, and a pole density of the {332}<113> crystal orientation is 5.0 or less, and a mean volume diameter of crystal grains in the metal structure is 7 μm or less.2. The high-strength cold-rolled steel sheet having excellent local ...

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Номер записи: 78
06-02-2014 дата публикации

Hot stamped article, method of producing hot stamped article, energy absorbing member, and method of producing energy absorbing member

Номер: US20140037980A1
Автор: Kaoru Kawasaki
Принадлежит: Individual

A hot stamped article has a component composition containing, in terms of % by mass, 0.002% to 0.1% of C, 0.01% to 0.5% of Si, 0.5% to 2.5% of Mn+Cr, 0.1% or less of P, 0.01% or less of S, 0.05% or less of t-Al, 0.005% or less of N, and 0.0005% to 0.004% of B which is optionally contained in a case where the Mn+Cr is 1.0% or more, the remainder being Fe and unavoidable impurities. The hot stamped article has a microstructure composed of, in terms of an area ratio, 0% or more and less than 90% of martensite, 10% to 100% of bainite, and less than 0.5% of unavoidable inclusion structures, or a microstructure composed of, in terms of an area ratio, 99.5% to 100% of bainitic ferrite, and less than 0.5% of unavoidable inclusion structures.

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Номер записи: 79
13-02-2014 дата публикации

Non-oriented electrical steel sheet

Номер: US20140041769A1
Автор: Takeshi Kubota
Принадлежит: Nippon Steel and Sumitomo Metal Corp

A non-oriented electrical steel sheet contains 2.8 mass % or more and 4.0 mass % or less of Si, 0.2 mass % or more and 3.0 mass % or less of Al, and 0.02 mass % or more and 0.2 mass % or less of P. The non-oriented electrical steel sheet contains further contains 0.5 mass % or more in total of at least one kinds selected from a group consisting of 4.0 mass % or less of Ni and 2.0 mass % or less of Mn. A C content is 0.05 mass % or less, a N content is 0.01 mass % or less, an average grain diameter is 15 μm or less, and a <111> axial density is 6 or larger.

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Номер записи: 80
13-02-2014 дата публикации

Hot press-formed product, process for producing same, and thin steel sheet for hot press forming

Номер: US20140044585A1
Автор: Junya Naitou, Keisuke Okita, Shushi Ikeda, Toshio Murakami
Принадлежит: Kobe Steel Ltd

There is provided a hot press-formed product, including a thin steel sheet formed by a hot press-forming method, and having a metallic structure that contains retained austenite at 3% to 20% by volume, whereby balance between strength and elongation can be controlled in a proper range and high ductility can be achieved.

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Номер записи: 81
13-02-2014 дата публикации

STEEL SHEET FOR HOT STAMPING MEMBER AND METHOD OF PRODUCING SAME

Номер: US20140044987A1
Автор: Maki Jun, TANAHASHI Hiroyuki
Принадлежит: NIPPON STEEL & SUMITOMO METAL CORPORATION

A steel sheet for a hot stamping member contains, as a chemical composition, 0.10 mass % to 0.35 mass % of C; 0.01 mass % to 1.0 mass % of Si; 0.3 mass % to 2.3 mass % of Mn; 0.01 mass % to 0.5 mass % of Al; limited to 0.03 mass % or less of P; limited to 0.02 mass % or less of S; limited to 0.1 mass % or less of N; and a balance consisting of Fe and unavoidable impurities, in which a standard deviation of diameters of iron carbides which are contained in a region from a surface to a ¼ thickness position of the steel sheet is less than or equal to 0.8 μm. 1. A steel sheet for a hot stamping member , the steel sheet comprising , as a chemical composition:0.10 mass % to 0.35 mass % of C;0.01 mass % to 1.0 mass % of Si;0.3 mass % to 2.3 mass % of Mn;0.01 mass % to 0.5 mass % of Al;limited to 0.03 mass % or less of P;limited to 0.02 mass % or less of S;limited to 0.1 mass % or less of N; anda balance consisting of Fe and unavoidable impurities,wherein a standard deviation of diameters of iron carbides which are contained in a region from a surface to a ¼ thickness position of the steel sheet is less than or equal to 0.8 μm.2. The steel sheet for a hot stamping member according to claim 1 ,wherein the chemical composition further contains one or more selected from the group consisting of0.01 mass % to 2.0 mass % of Cr;0.001 mass % to 0.5 mass % of Ti;0.001 mass % to 0.5 mass % of Nb;0.0005 mass % to 0.01 mass % of B;0.01 mass % to 1.0 mass % of Mo;0.01 mass % to 0.5 mass % of W;0.01 mass % to 0.5 mass % of V;0.01 mass % to 1.0 mass % of Cu; and0.01 mass % to 5.0 mass % of Ni.3. The steel sheet for a hot stamping member according to claim 1 ,wherein an Al plating layer having a plating thickness of 50 μm or less is formed on the surface.4. The steel sheet for a hot stamping member according to claim 1 ,wherein a Zn plating layer having a plating thickness of 30 μm or less is formed on the surface.5. The steel sheet for a hot stamping member according to claim 1 ,wherein a ...

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Номер записи: 82
13-02-2014 дата публикации

HIGH-STRENGTH STEEL SHEET EXCELLENT IN WORKABILITY AND MANUFACTURING METHOD THEREOF

Номер: US20140044988A1
Автор: FUTAMURA Yuichi, Kimura Takayuki, NAKAYA Michiharu
Принадлежит: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel Ltd.)

Provided are: a high-strength steel sheet which is improved in both elongation and local formability and thus exhibits excellent workability; and a manufacturing method thereof. The high-strength steel sheet contains C, Si, Mn, Al, P and S with the remainder including iron and unavoidable impurities, and has a metal structure which includes polygonal ferrite, bainite, tempered martensite, and retained austenite. In the metal structure, (1) the bainite has a composite microstructure including both a high-temperature-formed bainite having an average distance between adjacent regions of retained austenite and/or carbide of 1 μm or more and a low-temperature-formed bainite having an average distance between adjacent regions of retained austenite and/or carbide of less than 1 μm each identified upon observation with a scanning electron microscope; and (2) the retained austenite is present in a volume percentage of 5% or more of the entire metal structure as determined by a saturation magnetization measurement. 2. The high-strength steel sheet of claim 1 , wherein claim 1 , when martensite-austenite constituents comprising both as-quenched martensite and retained austenite are observed at a cross-section of the metal structure with an optical microscope claim 1 , martensite-austenite constituents each having an equivalent circle diameter “d” of greater than 7 μm are present in a number percentage of from 0% to less than 15% of a total number of the entire martensite-austenite constituents at the observed cross-section.3. The high-strength steel sheet of claim 1 , wherein grains of the polygonal ferrite have an average equivalent circle diameter D of from greater than 0 μm to 10 μm.4. The high-strength steel sheet of claim 1 , further comprising claim 1 , by mass percent based on a total mass of the steel sheet:from greater than 0% to 1% of Cr; and/orfrom greater than 0% to 1% of Mo.5. The high-strength steel sheet of claim 1 , further comprising claim 1 , by mass percent ...

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Номер записи: 83
13-02-2014 дата публикации

HIGH-STRENGTH COLD-ROLLED STEEL SHEET HAVING EXCELLENT UNIFORM ELONGATION AND HOLE EXPANDABILITY AND MANUFACTURING METHOD THEREOF

Номер: US20140044989A1
Автор: Fujita Nobuhiro, Ogawa Toshio, Okamoto Riki, Sano Kohichi, TODA Yuri, YOSHIDA Hiroshi
Принадлежит: NIPPON STEEL & SUMITOMO METAL CORPORATION

This high-strength cold-rolled steel sheet having excellent uniform elongation and hole expandability contains, C: 0.01 to 0.4%; Si: 0.001 to 2.5%; Mn: 0.001 to 4.0%; P: 0.001 to 0.15%; S: 0.0005 to 0.03%; Al: 0.001 to 2.0%; N: 0.0005 to 0.01%; and O: 0.0005 to 0.01%; in which Si+Al is limited to less than 1.0%, and a balance being composed of iron and inevitable impurities, in which at a sheet thickness center portion, an average value of pole densities of the {100}<011> to {223}<110> orientation group is 5.0 or less, and a pole density of the {332}<113> crystal orientation is 4.0 or less, a metal structure contains 5 to 80% of ferrite, 5 to 80% of bainite, and 1% or less of martensite in terms of an area ratio and the total of martensite, pearlite, and retained austenite is 5% or less, and an r value (rC) in a direction perpendicular to a rolling direction is 0.70 or more and an r value (r30) in a direction 30° from the rolling direction is 1.10 or less. 1. A high-strength cold-rolled steel sheet having excellent uniform elongation and hole expandability comprising:in mass %,C: 0.01 to 0.4%;Si: 0.001 to 2.5%;Mn: 0.001 to 4.0%;P: 0.001 to 0.15%;S: 0.0005 to 0.03%;Al: 0.001 to 2.0%;N: 0.0005 to 0.01%; andO: 0.0005 to 0.01%; in which Si+Al is limited to less than 1.0%, anda balance being composed of iron and inevitable impurities, whereinat a sheet thickness center portion being a range of ⅝ to ⅜ in sheet thickness from the surface of the steel sheet, an average value of pole densities of the {100}<011> to {223}<110> orientation group represented by respective crystal orientations of {100}<011>, {116}<110>, {114}<110>, {113}<110>, {112}<110>, {335}<110>, and {223}<110> is 5.0 or less, and a pole density of the {332}<113> crystal orientation is 4.0 or less,a metal structure contains 5 to 80% of ferrite, 5 to 80% of bainite, and 1% or less of martensite in terms of an area ratio and the total of martensite, pearlite, and retained austenite is 5% or less, andan r value ...

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Номер записи: 84
20-02-2014 дата публикации

HIGH STRENGTH STEEL SHEET HAVING EXCELLENT FORMABILITY AND STABILITY OF MECHANICAL PROPERTIES AND METHOD FOR MANUFACTURING THE SAME

Номер: US20140050941A1
Автор: HASEGAWA Hiroshi, Kaneko Shinjiro, Kawasaki Yoshiyasu, Nagataki Yasunobu
Принадлежит:

A high strength steel sheet including, by mass, C: 0.03% or more and 0.25% or less, Si: 0.4% or more and 2.5% or less, Mn: 3.5% or more and 10.0% or less, P: 0.1% or less, S: 0.01% or less, Al: 0.01% or more and 2.5% or less, N: 0.008% or less, Si+Al: 1.0% or more, the balance being Fe and inevitable impurities. The area ratio of ferrite is 30% or more and 80% or less, the area ratio of martensite is 0% or more and 17% or less, the volume fraction of retained austenite is 8% or more, and the average grain size of retained austenite is 2 μm or less. 1. A high strength steel sheet having excellent formability and stability of mechanical properties , the steel sheet having a composition including , by mass , C: 0.03% or more and 0.25% or less , Si: 0.4% or more and 2.5% or less , Mn: 3.5% or more and 10.0% or less , P: 0.1% or less , S: 0.01% or less , Al: 0.01% or more and 2.5% or less , N: 0.008% or less , Si+Al: 1.0% or more , and the balance being Fe and inevitable impurities , wherein the steel sheet has a steel microstructure comprising an area ratio of ferrite: 30% or more and 80% or less , an area ratio of martensite: 0% or more and 17% or less and a volume fraction of retained austenite: 8% or more , and an average grain size of the retained austenite is 2 μm or less.2. The high strength steel sheet according to claim 1 , wherein the steel microstructure further comprises an area ratio of tempered martensite: 5% or more.3. The high strength steel sheet according to claim 1 , wherein the composition further comprises claim 1 , by mass claim 1 , at least one element selected from the group consisting of Cr: 0.05% or more and 1.0% or less claim 1 , V: 0.005% or more and 0.5% or less claim 1 , Mo: 0.005% or more and 0.5% or less claim 1 , Ni: 0.05% or more and 1.0% or less claim 1 , and Cu: 0.05% or more and 1.0% or less.4. The high strength steel sheet according to claim 1 , wherein the composition further comprises claim 1 , by mass claim 1 , at least one ...

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Номер записи: 85
27-02-2014 дата публикации

STEEL MATERIAL HAVING EXCELLENT ATMOSPHERIC CORROSION RESISTANCE

Номер: US20140056752A1
Автор: Hoshino Toshiyuki, Kage Isamu, Komori Tsutomu, Miura Shinichi
Принадлежит: JFE STEEL CORPORATION

A steel material has excellent atmospheric corrosion resistance and a composition which contains more than 0.06% and less than 0.14% C, 0.05% or more and 2.00% or less Si, 0.20% or more and 2.00% or less Mn, 0.005% or more and 0.030% or less P, 0.0001% or more and 0.0200% or less S, 0.001% or more and 0.100% or less Al, 0.10% or more and 1.00% or less Cu, 0.10% or more and 0.65% or less Ni, 0.0001% or more and 1.000% or less Mo, preferably 0.005% or more and 1.000% or less Mo, 0.005% or more and 0.200% or less Nb, and Fe and unavoidable impurities as a balance. 1. A steel material having a the composition which contains , by mass % , more than 0.06% and less than 0.14% C , 0.05% or more and 2.00% or less Si , 0.20% or more and 2.00% or less Mn , 0.005% or more and 0.030% or less P , 0.0001% or more and 0.0200% or less S , 0.001% or more and 0.100% or less Al , 0.10% or more and 1.00% or less Cu , 0.10% or more and 0.65% or less Ni , 0.001% or more and 1.000% or less Mo , 0.005% or more and 0.200% or less Nb , and Fe and unavoidable impurities as a balance.2. The steel material according to claim 1 , further containing claim 1 , by mass % claim 1 , 0.005% or more and 1.000% or less Mo.3. The steel material according to claim 1 , further containing one claim 1 , two or more kinds selected from the group consisting of claim 1 , by mass % claim 1 , 0.2% or more and 1.0% or less Cr claim 1 , 0.01% or more and 1.00% or less Co claim 1 , 0.0001% or more and 0.1000% or less REM and 0.005% or more and 0.200% or less Sn.4. The steel material according to claim 1 , further containing one claim 1 , two or more kinds selected from the group consisting of claim 1 , by mass % claim 1 , 0.005% or more and 0.200% or less Ti claim 1 , 0.005% or more and 0.200% or less V claim 1 , 0.005% or more and 0.200% or less Zr claim 1 , 0.0001% or more and 0.0050% or less B and 0.0001% or more and 0.0100% or less Mg.5. The steel material according to claim 2 , further containing one claim 2 , ...

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Номер записи: 86
27-02-2014 дата публикации

Hot press-formed product, process for producing same, and thin steel sheet for hot press forming

Номер: US20140056753A1
Автор: Junya Naitou, Keisuke Okita, Shushi Ikeda, Toshio Murakami
Принадлежит: Kobe Steel Ltd

There is provided a hot press-formed product, including a steel sheet formed by a hot press-forming method, and having a metallic structure that contains ferrite at 30% to 80% by area, bainitic ferrite at lower than 30% by area (not including 0% by area), martensite at 30% by area or lower (not including 0% by area), and retained austenite at 3% to 20% by area, whereby balance between strength and elongation can be controlled in a proper range and high ductility can be achieved.

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Номер записи: 87
06-03-2014 дата публикации

STEEL FOR WELDED STRUCTURE AND PRODUCING METHOD THEREOF

Номер: US20140065008A1
Автор: CHIJIIWA Rikio, FUKUNAGA Kazuhiro, Kojima Akihiko, Uemori Ryuji, Watanabe Yoshiyuki
Принадлежит: NIPPON STEEL & SUMITOMO METAL CORPORATION

A steel for a welded structure includes the following composition: by mass %, C at a C content [C] of 0.015 to 0.045%; Si at a Si content [Si] of 0.05 to 0.20%; Mn at a Mn content [Mn] of 1.5 to 2.0%; Ni at a Ni content [Ni] of 0.10 to 1.50%; Ti at a Ti content [Ti] of 0.005 to 0.015%; O at an O content [O] of 0.0015 to 0.0035%; and N at a N content [N] of 0.002 to 0.006%, and a balance composed of Fe and unavoidable impurities. In the steel for a welded structure, the P content [P] is limited to 0.008% or less, the S content [S] is limited to 0.005% or less, the Al content [Al] is limited to 0.004% or less, the Nb content [Nb] is limited to 0.005% or less, the Cu content [Cu] is limited to 0.24% or less, the V content [V] is limited to 0.020% or less, and a steel composition parameter Pis 0.065% or less, and a steel composition hardness parameter CeqH is 0.235% or less. 1. A steel for a welded structure , comprising the following composition:by mass %,C at a C content [C] of 0.015 to 0.045%;Si at a Si content [Si] of 0.05 to 0.20%;Mn at a Mn content [Mn] of 1.5 to 2.0%;Ni at a Ni content [Ni] of 0.73% to 1.50%;Ti at a Ti content [Ti] of 0.005 to 0.015%;O at an O content [O] of 0.0015 to 0.0032%; andN at a N content [N] of 0.002 to 0.006%,and a balance composed of Fe and unavoidable impurities,wherein, a P content [P] is limited to 0.008% or less,a S content [S] is limited to 0.005% or less,an Al content [Al] is limited to 0.004% or less,a Nb content [Nb] is limited to 0.005% or less,a Cu content [Cu] is limited to 0.24% or less,a V content [V] is limited to 0.020% or less, and{'sub': 'CTOD', 'claim-text': [{'br': None, 'sub': 'CTOD', 'P=[C]+[V]/3+[Cu]/22+[Ni]/67\u2003\u2003(3)'}, {'br': None, 'CeqH=[C]+[Si]/4.16+[Mn]/14.9+[Cu]/12.9+[Ni]/105+1.12[Nb]+[V]/1.82\u2003\u2003(4).'}], 'a steel composition parameter Pof a following equation (3) is 0.065% or less, and a steel composition hardness parameter CeqH of a following equation (4) is 0.200% or less, where'}2. The ...

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Номер записи: 88
27-03-2014 дата публикации

AUSTENITIC IRON-BASED ALLOY, TURBOCHARGER AND COMPONENT MADE THEREOF

Номер: US20140086785A1
Автор: Claude Antoine
Принадлежит: BORGWARNER INC.

An austenitic iron-based alloy containing manganese and at most 10% by weight and in particular at most 5% by weight nickel, based in each case on the overall weight of the iron-based alloy. 1. An austenitic iron-based alloy containing manganese and at most 10% by weight nickel , based on the overall weight of the iron-based alloy.2. The austenitic iron-based alloy as claimed in claim 1 , wherein the manganese content is 8 to 25% by weight based on the overall weight of the iron-based alloy.3. The austenitic iron-based alloy as claimed in claim 1 , wherein claim 1 , in addition to iron and manganese claim 1 , it contains at least one of the elements selected from the group consisting of C claim 1 , Cr claim 1 , Si claim 1 , Nb claim 1 , Mo claim 1 , W and N.6. A component for turbocharger applications claim 1 , having an exhaust-gas temperature of up to 1050° C. consisting essentially of an iron-based alloy as claimed in .7. An exhaust-gas turbocharger claim 1 , comprising at least one component consisting essentially of an iron-based alloy containing manganese and at most 10% by weight nickel claim 1 , based on the overall weight of the iron-based alloy.8. The exhaust-gas turbocharger as claimed in claim 7 , wherein the manganese content in the iron-based alloy is 8 to 25% by weight based on the overall weight of the iron-based alloy.11. A process for producing a component made of an iron-based alloy as claimed in comprising:a. hot working the entire article to a first geometry which approximates the desired final geometry except for portions of the article which are at least about 25% oversized compared to the desired final geometry;b. heat treating the article to increase the grain size;c. warm working the oversized portions of the article to final shapewhereby the warm-worked portions of the article have enhanced tensile properties and the hot-worked portions of the article have enhanced creep properties by a pressure die casting process.12. (canceled)13. An ...

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Номер записи: 89
27-03-2014 дата публикации

COLD-ROLLED STEEL SHEET AND METHOD FOR PRODUCING SAME

Номер: US20140087208A1
Автор: Fujita Nobuhiro, Hayashi Kunio, Nakano Kazuaki, Ogawa Toshio, Okamoto Riki, Sano Kohichi, TODA Yuri, YOSHIDA Hiroshi
Принадлежит:

A cold-rolled steel sheet satisfies that an average pole density of an orientation group of {100}<011> to {223}<110> is 1.0 to 5.0, a pole density of a crystal orientation {332}<113> is 1.0 to 4.0, a Lankford-value rC in a direction perpendicular to a rolling direction is 0.70 to 1.50, and a Lankford-value r30 in a direction making an angle of 30° with the rolling direction is 0.70 to 1.50. Moreover, the cold-rolled steel sheet includes, as a metallographic structure, by area %, a ferrite and a bainite of 30% to 99% in total and a martensite of 1% to 70%. 1. A steel sheet which is a cold-rolled steel sheet , the steel sheet comprising , as a chemical composition , by mass % ,C: 0.01% to 0.4%,Si: 0.001% to 2.5%,Mn: 0.001% to 4.0%,Al: 0.001% to 2.0%,P: limited to 0.15% or less,S: limited to 0.03% or less,N: limited to 0.01% or less,O: limited to 0.01% or less, anda balance consisting of Fe and unavoidable impurities,wherein: an average pole density of an orientation group of {100}<011> to {223}<110>, which is a pole density represented by an arithmetic average of pole densities of each crystal orientation {100}<011>, {116}<110>, {114}<110>, {112}<110>, and {223}<110>, is 1.0 to 5.0 and a pole density of a crystal orientation {332}<113> is 1.0 to 4.0 in a thickness central portion which is a thickness range of ⅝ to ⅜ based on a surface of the steel sheet;a Lankford-value rC in a direction perpendicular to a rolling direction is 0.70 to 1.50 and a Lankford-value r30 in a direction making an angle of 30° with the rolling direction is 0.70 to 1.50; andthe steel sheet includes, as a metallographic structure, plural grains, and includes, by area %, a ferrite and a bainite of 30% to 99% in total and a martensite of 1% to 70%.2. The cold-rolled steel sheet according to claim 1 , further comprising claim 1 , as the chemical composition claim 1 , by mass % claim 1 , at least one selected from the group consisting ofTi: 0.001% to 0.2%,Nb: 0.001% to 0.2%,B: 0.0001% to 0.005%,Mg: ...

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Номер записи: 90
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: 91
01-01-2015 дата публикации

HIGH-STRENGTH STEEL SHEET WITH EXCELLENT WARM FORMABILITY AND PROCESS FOR MANUFACTURING SAME

Номер: US20150000796A1
Автор: Asai Tatsuya, Hata Hideo, KAJIHARA Katsura, Kakiuchi Elijah, MIZUTA Naoki, Murakami Toshio
Принадлежит: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)

This high-strength steel sheet contains, in mass %, 0.05 to 0.3% of C, 1 to 3% of Si, 0.5 to 3% of Mn, up to 0.1% (inclusive of 0%) of P, up to 0.01% (inclusive of 0%) of S, 0.001 to 0.1% of Al and 0.002 to 0.03% of N with the balance consisting of iron and unavoidable impurities, and has a microstructure which comprises, in area fraction relative to the microstructure, 40 to 85% of bainitic ferrite, 5 to 20% of retained austenite (γ), 10 to 50% (in total) of martensite and γ, and 5 to 40% of ferrite. The retained austenite (γ) has a C concentration of 0.5 to 1.0 mass %, while the quantity of γpresent in the ferrite grains is 1% or more (in area fraction) relative to the microstructure. 1. A high-strength steel sheet comprising iron and , in mass % ,C: from 0.05% to 0.3%,Si: from 1 to 3%,Mn: from 0.5% to 3%,P: from 0 to 0.1%,S: from 0 to 0.01%,Al: from 0.001% to 0.1% andN: from 0.002% to 0.03%,and having a microstructure which comprises:bainitic.ferrite: from 40 to 85%,retained austenite: from 5 to 20%,martensite+retained austenite: from 10 to 50%, andferrite: from 5 to 40%in terms of an area fraction relative to the total microstructure area, and{'sub': 'R', 'the retained austenite having from 0.5 to 1.0 mass % of a C concentration (Cγ), and the retained austenite comprises ferrite grains of 1% or more in terms of the area fraction relative to the total microstructure.'}2. The high-strength steel sheet according to claim 1 , further comprising one or more ofCr: from 0.01% to 3%.Mo: from 0.01 to 1%,Cu: from 0.01 to 2%.Ni: from 0.01 to 2%,B: from 0.00001 to 0.01%Ca: from 0.0005 to 0.01%,Mg: from 0.0005 to 0.01%, andREM: from 0.0001 to 0.01%.4. The method according to wherein the steel further comprises one or more ofCr: from 0.01% to 3%.Mo: from 0.01 to 1%,Cu: from 0.01 to 2%.Ni: from 0.01 to 2%,B: from 0.00001 to 0.01%Ca: from 0.0005 to 0.01%,Mg: from 0.0005 to 0.01%, andREM: from 0.0001 to 0.01%.5. The high-strength steel sheet according to claim 1 , wherein the ...

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Номер записи: 92
06-01-2022 дата публикации

PRODUCTION METHOD FOR HIGH-STRENGTH STEEL SHEET

Номер: US20220002832A1
Автор: Kaneko Shinjiro, Minami Hidekazu
Принадлежит: JFE STEEL CORPORATION

A production method for a high-strength steel sheet having a tensile strength TS of 780 MPa or more is provided. The production method comprises: heating a steel slab having a predetermined chemical composition; hotrolling the steel slab; coiling the hot-rolled sheet; subjecting the hot-rolled sheet to pickling treatment; holding the hot-rolled sheet in a pre-determined temperature range for predetermined time; cold rolling the hot-rolled sheet to obtain a cold-rolled sheet; subjecting the cold-rolled sheet to first annealing treatment; cooling the cold-rolled sheet at a pre-determined average cooling rate; cooling the cold-rolled sheet to room temperature; reheating the clod-rolled sheet to perform second annealing treatment; cooling the cold-rolled sheet at a first average cooling rate; cooling the cold-rolled sheet at a second average cooling rate; reheating the cold-rolled sheet to a predetermined reheating temperature range; and holding the cold-rolled sheet in the reheating temperature range. 1. A production method for a high-strength steel sheet having a tensile strength TS of 780 MPa or more , the production method comprising: C: 0.08% or more and 0.35% or less,', 'Si: 0.50% or more and 2.50% or less,', 'Mn: 1.50% or more and 3.00% or less,', 'P: 0.001% or more and 0.100% or less,', 'S: 0.0001% or more and 0.0200% or less, and', 'N: 0.0005% or more and 0.0100% or less,', 'optionally, in mass %, at least one element selected from the group consisting of', 'Al: 0.01% or more and 1.00% or less,', 'Ti: 0.005% or more and 0.100% or less,', 'Nb: 0.005% or more and 0.100% or less,', 'V: 0.005% or more and 0.100% or less,', 'B: 0.0001% or more and 0.0050% or less,', 'Cr: 0.05% or more and 1.00% or less,', 'Cu: 0.05% or more and 1.00% or less,', 'Sb: 0.0020% or more and 0.2000% or less,', 'Sn: 0.0020% or more and 0.2000% or less,', 'Ta: 0.0010% or more and 0.1000% or less,', 'Ca: 0.0003% or more and 0.0050% or less,', 'Mg: 0.0003% or more and 0.0050% or less, and', ' ...

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Номер записи: 93
06-01-2022 дата публикации

WELDED STEEL SHEETS, AND SHEETS THUS PRODUCED

Номер: US20220002833A1
Автор: CELOTTO Thierry, CHICHARRO HERRANZ Francisco, DECHASSEY Emmanuel, DUPUY Thomas, KACZYNSKI Christine, NGO Quang-Tien, POLO MESTRE Vicente, SILVY-LELIGOIS Christophe, THEYSSIER Marie-Christine
Принадлежит:

A steel sheet that is welded and then cold rolled to a thickness between 0.5 mm and 3 mm, the deformation ratio created by cold rolling in the base metal is equal to ε, for which the deformation ratio created by the cold rolling in the welded joint is equal to ε, where: 2. The steel sheet as recited in wherein the steel sheet has a tensile strength Rm greater than 600 MPa.3. The steel sheet as recited in wherein a composition of the base metal includes claim 1 , as contents expressed as weight percent:0.05%≤C≤0.17%;1.1%≤Mn≤2.76%;0.07%≤Si≤0.7%;S≤0.008%;P≤0.030%;0.015%≤Al≤0.61%;Mo≤0.13%;Cr≤0.55%;Cu<0.2%;Ni≤0.2%;Nb≤0.050%;Ti≤0.045%;V≤0.010%;B≤0.005%;Ca<0.030%; andN≤0.007%,a remainder being iron and unavoidable impurities due to processing.4. The steel sheet as recited in wherein the steel sheet has a tensile strength Rm greater than 690 MPa.5. The steel sheet as recited in wherein a composition of the base metal includes claim 4 , the contents being expressed as weight percent:0.13%≤C≤0.3%;1.8%≤Mn≤3.5%;0.1%≤Si≤2%;0.1%≤Al≤2%;1%≤S1+Al≤2.5%; andN≤0.010%;a remainder being iron and unavoidable impurities due to processing.6. The steel sheet as recited in wherein the composition of the base metal includes claim 5 , the contents being expressed as weight percent:Ni+Cr+Mo<1%;Ti≤0.1%;Nb≤0.1%; andV≤0.1%.7. The steel sheet as recited in wherein the steel sheet is suitable for press-hardening for the manufacture of parts having tensile strength Rm greater than 1000 MPa.8. The steel sheet as recited in wherein the composition of the base metal includes claim 7 , the contents being expressed as weight percent:0.15%≤C≤0.5%;0.4%≤Mn≤3%;0.1≤Si≤1%;Cr≤1%;Ti≤0.2%;Al≤0.1%; andB≤0.010%;a remainder being iron and unavoidable impurities due to processing.9. The steel sheet as recited in wherein the composition of the base metal includes at least one of claim 8 , the contents being expressed as weight percent:0.25%≤Nb≤2%; andNb≤0.060%.10. The steel sheet as recited in wherein the base metal is ...

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Номер записи: 94
02-01-2020 дата публикации

HOT STAMPED BODY

Номер: US20200001342A1
Автор: ABUKAWA Genki, FUJINAKA Shingo, HIKIDA Kazuo, Maeda Daisuke, TODA Yuri
Принадлежит: NIPPON STEEL CORPORATION

There is provided a hot stamped body including a middle part in sheet thickness and a surface layer arranged at both sides or one side of the middle part in sheet thickness, further including an intermediate layer formed between the middle part in sheet thickness and each surface layer so as to adjoin them, wherein the middle part in sheet thickness has a predetermined composition, the middle part in sheet thickness has a hardness of 500 Hv or more and 800 Hv or less, the surface layer has a hardness change ΔHin the sheet thickness direction of 10 Hv or more and less than 200 Hv, and the intermediate layer has a hardness change ΔHin the sheet thickness direction of 50 Hv or more and less than 200 Hv. 1. A hot stamped body comprising: a middle part in sheet thickness; an intermediate layer; and a surface layer , the intermediate layer adjoining the middle part in sheet thickness and the surface layer ,wherein the middle part in sheet thickness comprises, by mass %,C: 0.20% or more and less than 0.70%Si: less than 3.00%,Mn: 0.20% or more and less than 3.00%,P: 0.10% or less,S: 0.10% or less,sol. Al: 0.0002% or more and 3.0000% or less,N: 0.01% or less, anda balance of Fe and unavoidable impurities,the middle part in sheet thickness has a hardness of 500 Hv or more and 800 Hv or less,{'sub': '1', 'the surface layer has a hardness change ΔHin the sheet thickness direction of 10 Hv or more and less than 200 Hv, and'}{'sub': '2', 'the intermediate layer has a hardness change ΔHin the sheet thickness direction of 50 Hv or more and less than 200 Hv.'}2. The hot stamped body according to claim 1 , wherein the Si content of the middle part in sheet thickness is 0.50% or less and the Mn content of the middle part in sheet thickness is 0.20% or more and less than 1.50%.3. The hot stamped body according to claim 1 , wherein the Si content of the middle part in sheet thickness is 0.50% or less and the Mn content of the middle part in sheet thickness is 1.50% or more and less than ...

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Номер записи: 95
02-01-2020 дата публикации

HYDROGEN OCCLUSION CARTRIDGE

Номер: US20200002163A1
Автор: Dowaki Kiyoshi, Dowaki Naoki, Kameyama Mitsuo, Katayama Noboru
Принадлежит:

A hydrogen storage cartridge small and lightweight allows storage and discharge of hydrogen at low pressure and normal temperature. It also can effectively absorb the volume expansion accompanying atomization of a hydrogen storage alloy that occurs due to repeated storage and discharge of hydrogen, and therefore a hydrogen storage cartridge (A) is provided in which deformation due to repeated use, and in particular irregular deformation, extremely unlikely, also it can effectively avoid hydrogen storage irregularities of the hydrogen storage alloy. The hydrogen storage cartridge (A) is used for storage of hydrogen contained in biomass thermal decomposition gas, wherein the material of the hydrogen storage cartridge (A) is pure titanium, and the hydrogen storage cartridge (A) includes in the interior space (), as a hydrogen storage alloy, at least one hydrogen storage alloy selected from the group comprising lanthanum mischmetal/nickel, titanium/iron, calcium/nickel, and lanthanum/nickel. 1. A hydrogen occlusion cartridge used for occluding hydrogen recovered from a biomass pyrolysis gas , wherein a material for the hydrogen occlusion cartridge is pure titanium , and an inner space of the hydrogen occlusion cartridge contains one or more selected from a group consisting of a lanthanum mischmetal-nickel type hydrogen occlusion alloy , a titanium-iron type hydrogen occlusion alloy and a calcium-nickel type hydrogen occlusion alloy as hydrogen occlusion alloys.2. The hydrogen occlusion cartridge according to claim 1 , whereina shape of the inner space of the hydrogen occlusion cartridge is substantially rectangular parallelepiped,the inner space of the hydrogen occlusion cartridge comprises a plurality of chambers for accommodating the hydrogen occlusion alloy, which are separated by at least one partitioning plate,a dimension of the partitioning plate in a longitudinal direction is 70 to 80% of a total length of a dimension of the inner space of the hydrogen occlusion ...

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Номер записи: 96
07-01-2016 дата публикации

HOT-ROLLED STEEL SHEET HAVING EXCELLENT DRAWABILITY AND POST-PROCESSING SURFACE HARDNESS

Номер: US20160002745A1
Автор: KAJIHARA Katsura
Принадлежит:

The present invention intends a hot-rolled steel sheet with a sheet thickness in a range of 2 to 15 mm, having component composition including C: 0.3% or less by mass %, Si: 0.5% or less, Mn: in a range of 0.2 to 1%, P: 0.05% or less, S: 0.05% or less, Al: in a range of 0.01 to 0.1%, N: in a range of 0.008 to 0.025%, and the remainder being iron and unavoidable impurities. The hot-rolled steel sheet includes an amount of solute N: not less than 0.007%, and ferrite grains existing at a position of t/4 in depth (t: the sheet thickness) includes the ferrite grains, a sheet plane orientation thereof, within 10° from the (123) plane, having an area ratio: not less than 20%, the ferrite grains, a sheet plane orientation thereof, within 10° from the (111) plane, having an area ratio: not less than 5%, and the ferrite grains, a sheet plane orientation thereof, within 10° from the (001) plane, having an area ratio: 20% or less, the average grain size of the ferrite grains existing at the position of t/4 in depth being in a range of 3 to 35 μm. 1. A steel sheet with a sheet thickness in a range of 2 to 15 mm comprising:C: >0 to 0.3 mass;Si: >0 to 0.5 mass %;Mn: in a range of 0.2 to 1 mass %;P: >0 to 0.05 mass %;S: >0 to 0.05 mass %;Al: in a range of 0.01 to 0.1 mass %;N: in a range of 0.008 to 0.025 mass %,solute N: in an amount not less than 0.007 mass %; andthe remainder being iron and unavoidable impurities.2. The hot rolled steel sheet according to claim 1 , further comprising at least one element selected from at least one of groups (a) to (e):(a) at least one element selected from the group consisting of >0 to 2 mass % of Cr and >0 to 2 mass % of Mo,(b) at least one element selected from the group consisting of Ti: >0 to 0.2 mass %, Nb: >0 to 0.2 mass %, and V: >0 to 0.2 mass %,(c) B: >0 to 0.005 mass %,(d) at least one element selected from the group consisting of Cu: >0 to 5%, Ni: >0 to 5 mass %, and Co: >0 to 5 mass %, and(e) at least one element selected from the ...

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Номер записи: 97
07-01-2016 дата публикации

HIGH-STRENGTH STEEL WIRE MATERIAL EXHIBITING EXCELLENT COLD-DRAWING PROPERTIES, AND HIGH-STRENGTH STEEL WIRE

Номер: US20160002755A1
Автор: Ishida Tomonobu, Yoshihara Nao
Принадлежит: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)

Provided are: a technique with which air blast cooling can be used to produce, with excellent productivity, a high-strength steel wire material capable of achieving uniform high strength and high ductility, even when cold drawn; a high-strength steel wire produced from this high-strength steel wire material; and a zinc-plated high-strength steel wire. This high-strength steel wire material respectively includes 0.80-1.3% of C, 0.1-1.5% of Si, 0.1-1.5% of Mn, more than 0% but not more than 0.03% of P, more than 0% but not more than 0.03% of S, 0.0005-0.01% of B, 0.01-0.10% of Al, and 0.001-0.006% of N, the remainder comprising iron and unavoidable impurities. The area ratio of pearlite in the structure of the high-strength steel wire material is at least 90%. The average grain size number (P) of pearlite nodules and the standard deviation (Pσ) thereof respectively satisfy formula (1), namely 7.0≦P≦10.0, and formula (2), namely Pσ≦0.6. 1. A high-strength steel wire rod having good rod drawability , comprising:C: 0.80 to 1.3% (by mass percent (the same applies to the following for the components));Si: 0.1 to 1.5%;Mn: 0.1 to 1.5%;P: more than 0% and 0.03% or less;S: more than 0% and 0.03% or less;B: 0.0005 to 0.01%;Al: 0.01 to 0.10%; andN: 0.001 to 0.006%;the remainder consisting of iron and inevitable impurities,{'sub': 'ave', 'claim-text': [{'br': None, 'sub': 'ave', '7.0≦P≦10.0 \u2003\u2003(1)'}, {'br': None, 'Pσ≦0.6 \u2003\u2003(2)'}], 'wherein, in a microstructure of the steel wire rod, an area ratio of pearlite is 90% or more, and an average Pand standard deviation Pσ of a pearlite nodule size number satisfy Formulas (1) and (2), respectively,'}2. The high-strength steel wire rod according to claim 1 , wherein an area ratio of grain-boundary ferrite grains is 1.0% or less.3. The high-strength steel wire rod according to claim 1 , wherein Cis 0.85 to 1.45% claim 1 , the Cbeing represented by Formula (3){'br': None, 'sub': 'eq', 'C=[C]+[Si]/24+[Mn]/6+[Ni]/40+[Cr]/5 ...

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Номер записи: 98
07-01-2016 дата публикации

High-toughness low-alloy wear-resistant steel sheet and method of manufacturing the same

Номер: US20160002759A1
Автор: Hongbin Li, Kougen WU, Liandeng Yao, Yuchuan MIAO
Принадлежит: Baoshan Iron and Steel Co Ltd

A high-toughness low-alloy wear-resistant steel sheet and a method of manufacturing the same, which has the chemical compositions (wt %): C: 0.08-0.20%; Si: 0.10-0.60%; Mn: 1.00-2.00%; B: 0.0005-0.0040%; Cr: less than or equal to 1.50%; Mo: less than or equal to 0.80%; Ni: less than or equal to 1.50%; Nb: less than or equal to 0.080%; V: less than or equal to 0.080%; Ti: less than or equal to 0.060%; Al: 0.010-0.080%, Ca: 0.0010-0.0080%, N: less than or equal to 0.0080%, 0: less than or equal to 0.0080%, H: less than or equal to 0.0004%, P: less than or equal to 0.015%, S: less than or equal to 0.010%, and (Cr/5+Mn/6+50B): more than or equal to 0.20% and less than or equal to 0.55%; (Mo/3+Ni/5+2Nb): more than or equal to 0.02% and less than or equal to 0.45%; (Al+Ti): more than or equal to 0.01% and less than or equal to 0.13%, the remainders being Fe and unavoidable impurities. The present invention reduces the contents of carbon and alloy elements, and makes full use of the characteristics of refinement, strengthening, etc. of micro-alloy elements such as Nb, Ti, etc., and through TMCP process, the wear-resistant steel sheet has high strength, high hardness, good toughness, good weldability, excellent wear-resistant performance, and is applicable to wearing parts in various mechanical equipments.

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Номер записи: 99
07-01-2016 дата публикации

HIGH-STRENGTH STEEL SHEET AND PRODUCTION METHOD THEREFOR AND HIGH-STRENGTH GALVANIZED STEEL SHEET AND PRODUCTION METHOD THEREFOR (AS AMENDED)

Номер: US20160002762A1
Автор: Fushiwaki Yusuke, Kawasaki Yoshiyasu, Nagataki Yasunobu
Принадлежит: JFE STEEL CORPORATION

Provided is a high-strength steel sheet that has good chemical convertibility and good corrosion resistance after electro deposition painting despite high Si and Mn contents. Also provided are a method for producing the high-strength steel sheet, a high-strength galvanized steel sheet formed by using the high-strength steel sheet, and a method for producing the high-strength galvanized steel sheet. A steel sheet containing, in terms of % by mass, C: 0.03 to 0.35%, Si: 0.01 to 0.50%, Mn: 3.6 to 8.0%, Al: 0.001 to 1.00%, P≦0.10%, S≦0.010%, and the balance being Fe and unavoidable impurities is annealed under condition under which a dew point of an atmosphere in a temperature zone of 550° C. or higher and A° C. or lower (A is a particular value that satisfies 600≦A≦750) inside an annealing furnace is controlled to −40° C. or lower. 1. A method for producing a high-strength steel sheet , comprising:an annealing step of annealing a steel sheet containing, in terms of % by mass, C: 0.03 to 0.35%, Si: 0.01 to 0.50%, Mn: 3.6 to 8.0%, Al: 0.001 to 1.00%, P≦0.10%, S≦0.010%, and the balance being Fe and unavoidable impurities, wherein annealing is conducted under a condition under which a dew point of an atmosphere in a temperature zone of 550° C. or higher and A° C. or lower (A is a particular value that satisfies 600≦A≦750) inside an annealing furnace is controlled to −40° C. or lower.2. The method for producing a high-strength steel sheet according to claim 1 , further comprising an electrolytic pickling step of electrolytically pickling the steel sheet that has been subjected to the annealing step claim 1 , in an aqueous solution containing sulfuric acid.3. The method for producing a high-strength steel sheet according to claim 1 , wherein the steel sheet has a composition further containing at least one element selected from B: 0.001 to 0.005% claim 1 , Nb: 0.005 to 0.05% claim 1 , Ti: 0.005 to 0.05% claim 1 , Cr: 0.001 to 1.0% claim 1 , Mo: 0.05 to 1.0% claim 1 , Cu: 0. ...

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Номер записи: 100