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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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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 33962. Отображено 100.
05-01-2012 дата публикации

Steel Alloy

Номер: US20120000336A1
Автор: Andreas Schremb
Принадлежит: Gebr Schmachtenberg GmbH

An alloy, such as a tool steel containing, in percent by weight, 0.5%-0.7% carbon; 1.80%-2.50% chromium; 0.90%-1.20% molybdenum; 3.50%-5.50% nickel and 0.60%-1.50% vanadium. The steel alloyed accordingly is eminently suitable for heat treatments for influencing strength. With a carbon content of less than 0.7%, a partially martensitic metal structure having a high ductility can be formed by way of hardening processes. Due to surface hardening, the carbon content may in some portions on the outer surface be greater than 0.7%.

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Номер записи: 1
05-01-2012 дата публикации

Method of Making Ultra-High Strength Stainless Steels

Номер: US20120000579A1
Автор: Warren M. Garrison, Jr.
Принадлежит: CARNEGIE MELLON UNIVERSITY

An ultra-high strength stainless steel alloy with enhanced toughness includes in % by weight: 0 to 0.06% carbon (C); 12.0 to 18% chromium (Cr); 16.5 to 31.0% cobalt (Co); 0 to 8% molybdenum (Mo); 0.5 to 5.0% nickel (Ni); 0 to 0.5% titanium (Ti); 0 to 1.0% niobium (Nb); 0 to 0.5% vanadium (V); 0 to 16% tungsten (W); balance iron (Fe) and incidental deoxidizers and impurities. The heat treating method includes the steps of austenitizing at least once followed by quenching, tempering and sub-zero cooling to obtain no more than about 6-8% retained austenite in the finished alloy.

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Номер записи: 2
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: 3
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: 4
26-01-2012 дата публикации

Process for manufacturing a cold rolled trip steel product

Номер: US20120018058A1
Автор: Bruno De Cooman, Joachim Antonissen, Liesbeth Barbe, Lucia Tosal-Martinez, Marijke De Meyer, Serge Claessens, Sigrid Jacobs, Sven Vandeputte
Принадлежит: Arcelor France SA

The present invention is related to a process comprising a cold rolling step, for the production of uncoated, electro-galvanised or hot dip galvanised TRIP steel products, hot rolling a slab of a specific composition, wherein the finishing rolling temperature is higher than the Ar3 temperature, to form a hot-rolled substrate, cooling said substrate to a coiling temperature (CT) between 500° C. and 680° C., coiling said substrate at said coiling temperature, pickling said substrate to remove the oxides, cold rolling said substrate to obtain a reduction of thickness, with a minimum reduction of 40%.

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Номер записи: 5
26-01-2012 дата публикации

Ferritic stainless steel with excellent heat resistance

Номер: US20120020827A1
Автор: Hiroki Ota, Takumi Ujiro, Tetsuyuki Nakamura, Yasushi Kato
Принадлежит: JFE Steel Corp

A ferritic stainless steel contains no expensive elements such as Mo and W, is free from the oxidation resistance loss caused by addition of Cu, and thereby has excellent levels of oxidation resistance (including water vapor oxidation resistance), thermal fatigue property, and high-temperature fatigue property. The ferritic stainless steel contains, in mass %, C at 0.015% or less, Si at 0.4 to 1.0%, Mn at 1.0% or less, P at 0.040% or less, S at 0.010% or less, Cr at 16 to 23%, Al at 0.2 to 1.0%, N at 0.015% or less, Cu at 1.0 to 2.5%, Nb at 0.3 to 0.65%, Ti at 0.5% or less, Mo at 0.1% or less, and W at 0.1% or less, the Si and the Al satisfying a relation Si (%)≧Al (%).

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Номер записи: 6
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: 7
22-03-2012 дата публикации

High-strength steel sheet and the method for production therefor

Номер: US20120070330A1
Автор: Astrid Frommeyer, Georg Frommeyer, Klaus Brokmeier, Masashi Ishii, Sven Leonhardt, Ursula Frommeyer, Yoshitaka Okitsu
Принадлежит: Honda Motor Co Ltd

A high-strength steel sheet comprises, by weight, not less than 0.25% and not more than 0.5% of C, not less than 4% and not more than 14% of Mn, not less than 6.5% and not more than 9.5% of Cr, and not less than 0.3% and not more than 3% of Si. The high-strength steel sheet satisfies the following formulas 1 and 2 and mainly consists of austenite, and the high-strength steel sheet has yield strength of not less than 1000 MPa and total elongation of not less than 20%. 12≦2.0Si+5.5Al+Cr+1.5Mo≦25   (1) 13 ≦30C+0.5Mn+0.3Cu+Ni+25N≦17   (2) (Each element symbol in the above formulas indicates the content (weight %) of the element)

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Номер записи: 8
12-04-2012 дата публикации

Fabrication process of coated stamped parts and parts prepared from the same

Номер: US20120085467A1
Автор: Isabelle Thirion, Karl Michael Bader, Ludwig Schaller, Michael Alsmann, Pascal Drillet, Raisa Grigorieva, Thomas Vietoris, Uwe Paar
Принадлежит: ARCELORMITTAL INVESTIGACIÓN Y DESARROLLO SL

A manufacturing process of a hot stamped coated part comprising the following successive steps, in this order: providing a hot rolled or cold rolled steel sheet comprising a steel substrate and an aluminium-silicon alloy precoating, the precoating containing more than 50% of free aluminium and having a thickness comprised between 15 and 50 micrometers, then cutting the steel sheet to obtain a precoated steel blank, then heating the blank under non protective atmosphere up to a temperature T i comprised between T e −10° C. and T e , Te being the eutectic or solidus temperature of the precoating, then heating the blank from the temperature T i up to a temperature T m comprised between 840 and 950° C. under non protective atmosphere with a heating rate V comprised between 30° C./s and 90° C./s, V being the heating rate between the temperature T i and the temperature T m , in order to obtain a coated heated blank, then soaking the coated heated blank at said temperature T m for a time t m comprised between 20 s and 90 s, then hot stamping the blank in order to obtain a hot stamped coated part, then cooling said stamped part at a cooling rate in order to form a microstructure in the steel substrate comprising at least one constituent chosen among martensite or bainite.

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Номер записи: 9
03-05-2012 дата публикации

HIGH Cr FERRITIC/MARTENSITIC STEELS HAVING AN IMPROVED CREEP RESISTANCE FOR IN-CORE COMPONENT MATERIALS IN NUCLEAR REACTOR, AND PREPARATION METHOD THEREOF

Номер: US20120106693A1
Автор: Chan Bock Lee, Chang Hee Han, Dohee Hahn, Jong Hyuk Baek, Jun Hwan Kim, Sung Ho Kim, Tae Kyu Kim, Woo Gon Kim, Yeong-II Kim
Принадлежит: Korea Atomic Energy Research Institute KAERI, Korea Hydro and Nuclear Power Co Ltd

Disclosed herein is a high Cr Ferritic/Martensitic steel comprising 0.04 to 0.13% by weight of carbon, 0.03 to 0.07% by weight of silicon, 0.40 to 0.50% by weight of manganese, 0.40 to 0.50% by weight of nickel, 8.5 to 9.5% by weight of chromium, 0.45 to 0.55% by weight of molybdenum, 0.10 to 0.25% by weight of vanadium, 0.02 to 0.10% by weight of tantalum, 0.21 to 0.25% by weight of niobium, 1.5 to 3.0% by weight of tungsten, 0.015 to 0.025% by weight of nitrogen, 0.01 to 0.02% by weight of boron and iron balance. By regulating the contents of alloying elements such as nitrogen, born, the high Cr Ferritic/Martensitic steel with to superior tensile strength and creep resistance is provided, and can be effectively used as an in-core component material for sodium-cooled fast reactor (SFR).

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Номер записи: 10
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: 11
31-05-2012 дата публикации

Method for producing martensitic steel with mixed hardening

Номер: US20120132326A1
Автор: Laurent Ferrer, Philippe Heritier
Принадлежит: Aubert and Duval SA, SNECMA SAS

A method of producing a martensitic steel including a content of other metals such that it can be hardened by intermetallic compound and carbide precipitation, with an Al content of between 0.4% and 3%. The heat shaping temperature of a last heat shaping pass of the steel is lower than the solubility temperature of aluminum nitrides in the steel, and a treatment temperature for each potential heat treatment after the last heat shaping pass is lower than the solid-state solubility temperature of the aluminum nitrides in the steel.

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Номер записи: 12
07-06-2012 дата публикации

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

Номер: US20120138197A1
Автор: Kazuhiro Seto, Masahide Watabe, Noriaki Kohsaka, Reiko Sugihara, Yasushi Tanaka
Принадлежит: JFE Steel Corp

A steel sheet contains, on a mass percent basis, 0.03%-0.12% C, 0.5% or less Si, 0.8%-1.8% Mn, 0.030% or less P, 0.01% or less S, 0.005%-0.1% Al, 0.01% or less N, 0.035%-0.100% Ti, and the balance being Fe and incidental impurities and has microstructures with a fraction of polygonal ferrite of 80% or more, the polygonal ferrite having an average grain size of 5 to 10 μm. The amount of Ti present in a precipitate having a size of less than 20 nm is 70% or more of the value of Ti* calculated using expression (1): Ti*=[Ti]−48×[N]/14  (1) where [Ti] and [N] represent a Ti content (percent by mass) and a N content percent by mass), respectively, of the steel sheet.

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Номер записи: 13
12-07-2012 дата публикации

Bearing steels

Номер: US20120177527A1
Автор: Aidan Michael Kerrigan, Henrik Karlsson, Mohamed Sherif
Принадлежит: SKF AB

There is provided a novel bearing steel composition and a method of forming a bearing. The bearing steel composition comprises: Carbon 0.4 to 0.8 wt %; Nitrogen 0.1 to 0.2 wt %; Chromium 12 to 18 wt %; Molybdenum 0.7 to 1.3 wt %; Silicon 0.3 to 1 wt %; Manganese 0.2 to 0.8 wt %; and Iron 78 to 86.3 wt %.

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Номер записи: 14
26-07-2012 дата публикации

High-strength seamless steel tube, having excellent resistance to sulfide stress cracking, for oil wells and method for manufacturing the same

Номер: US20120186704A1
Автор: Haruo Nakamichi, Katsumi Yamada, Kenichiro Eguchi, Mitsuo Kimura, Yasuhide Ishiguro, Yuji Tanaka
Принадлежит: JFE Steel Corp

A seamless steel tube contains 0.15% to 0.50% C, 0.1% to 1.0% Si, 0.3% to 1.0% Mn, 0.015% or less P, 0.005% or less S, 0.01% to 0.1% Al, 0.01% or less N, 0.1% to 1.7% Cr, 0.4% to 1.1% Mo, 0.01% to 0.12% V, 0.01% to 0.08% Nb, and 0.0005% to 0.003% B or further contains 0.03% to 1.0% Cu on a mass basis and has a microstructure which has a composition containing 0.40% or more solute Mo and a tempered martensite phase that is a main phase and which contains prior-austenite grains with a grain size number of 8.5 or more and 0.06% by mass or more of a dispersed M 2 C-type precipitate with substantially a particulate shape.

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Номер записи: 15
26-07-2012 дата публикации

Nonmagnetic stainless steel, member for radio-controlled timepiece, production process of nonmagnetic stainless steel and radio wave receiver

Номер: US20120190321A1
Автор: Junichi Sato, Kenji Yokoyama, Toshihiro Uehara
Принадлежит: Casio Computer Co Ltd, Hitachi Metals Ltd

A nonmagnetic stainless steel which has a higher electrical resistivity than existing nonmagnetic alloys, a production process for producing the stainless steel, and a radio wave receiver. The receiver has a main case and rear cover constituted of a nonmagnetic stainless steel having an electrical resistivity as high as more than 100 μΩ·cm and consisting of C: not more than 0.1%, Si: 4.0-7.5%, Mn: not more than 2.0%, Ni: 25.5-30.0%, Cr: 15.0-20.0%, Mo: 0.1-3.0%, Cu: 0-2.0%, in mass % and the balance Fe and impurities. Even if some variable magnetic flux generated by a coil of an antenna runs through the main case and the rear cover, the receiving efficiency of the antenna can be prevented from being reduced by eddy current loss and a sufficient radio receiving sensitivity can be obtained. This nonmagnetic stainless steel is produced by hot and/or cold plastic working and subsequent solution treating conducted at 1,000-1,180° C.

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Номер записи: 16
09-08-2012 дата публикации

Heat treatment of martensitic stainless steel after remelting under a layer of slag

Номер: US20120199252A1
Автор: Laurent Ferrer, Patrick Philipson
Принадлежит: SNECMA SAS

A method fabricating a stainless martensitic steel, including electroslag remelting then cooling an ingot of the steel, then at least one austenitic thermal cycle heating the ingot above its austenitic temperature followed by a cooling. During each cooling: if the cooling is not followed by an austenitic thermal cycle, holding the ingot at a holding temperature included in the ferritic-pearlitic transformation nose for a hold time longer than sufficient for transforming the austenite into a ferritic-pearlitic structure in the ingot as completely as possible at the holding temperature; if the cooling is followed by an austenitic thermal cycle, before its minimum temperature falls below the martensitic transformation start temperature, the ingot is either held throughout the period between the two austenitic thermal cycles at a temperature above the austenitic transformation completion temperature on heating, or held at the holding temperature included in the ferritic-pearlitic transformation nose.

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Номер записи: 17
18-10-2012 дата публикации

Hot-rolled steel car or wire rod

Номер: US20120263622A1
Автор: Akira Kito, Takayuki Nakamura, Yoshihiro Daitoh
Принадлежит: Sumitomo Metal Industries Ltd

A hot-rolled steel bar or wire rod consisting of C: 0.1 to 0.3%, Si: 0.05 to 1.5%, Mn: 0.4 to 2.0%, S: 0.003 to 0.05%, Cr: 0.5 to 3.0%, Al: 0.02 to 0.05%, and N: 0.010 to 0.025%, the balance being Fe and impurities, and the impurities containing P: 0.025% or less, Ti: 0.003% or less, and O: 0.002% or less, wherein the structure thereof is composed of a ferrite-pearlite structure, ferrite-pearlite-bainite structure, or ferrite-bainite structure; the standard deviation of ferrite fractions at the time when randomly selected 15 viewing fields of a transverse cross section are observed and measured with the area per one viewing field being 62,500 μm 2 is 0.10 or less; and in a region from the surface to one-fifth of the radius and a region from the center to one-fifth of the radius in the transverse cross section, the amount of Al precipitating as AlN is 0.005% or less, and the density in terms of the number of AlN having a diameter of 100 nm or larger is 5/100 μm 2 or less. In the hot-rolled steel bar or wire rod, even if hot forging is performed in various temperature ranges, austenite grains can be stably prevented from being coarsened at the time of heating for carburization.

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Номер записи: 18
08-11-2012 дата публикации

Austenitic stainless steel pipe excellent in steam oxidation resistance and manufacturing method therefor

Номер: US20120279607A1
Автор: Katsuki Tanaka, Masahiro Seto, Mitsuru Yoshizawa, Yoshitaka Nishiyama
Принадлежит: Sumitomo Metal Industries Ltd

There is provided an austenitic stainless steel pipe excellent in steam oxidation resistance. The austenitic stainless steel pipe excellent in steam oxidation resistance contains, by mass percent, 14 to 28% of Cr and 6 to 30% of Ni, and is configured so that a region satisfying the following Formula exists in a metal structure at a depth of 5 to 20 μm from the inner surface of the steel pipe: (α/β)×δ/ε×100≧0.3 where the meanings of symbols in the above Formula are as follows: α: sum total of the number of pixels of digital image in region in which orientation difference of adjacent crystals detected by electron backscattering pattern is 5 to 50 degrees β: the number of total pixels of digital image in region of measurement using electron backscattering pattern ε: analysis pitch width of electron backscattering pattern (μm) δ: grain boundary width (μm).

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Номер записи: 19
22-11-2012 дата публикации

Drawn heat treated steel wire for high strength spring use and pre-drawn steel wire for high strength spring use

Номер: US20120291927A1
Автор: Masayuki Hashimura, Tetsushi Chida
Принадлежит: Nippon Steel Corp

Drawn heat treated steel wire for high strength spring use is provided containing, by mass %, C: 0.67% to less than 0.9%, Si: 2.0 to 3.5%, Mn: 0.5 to 1.2%, Cr: 1.3 to 2.5%, N: 0.003 to 0.007%, and Al: 0.0005% to 0.003%, having Si and Cr satisfying the following formula: 0.3%≦Si−Cr≦1.2%, and having a balance of iron and unavoidable impurities, having as impurities, P: 0.025% or less and S: 0.025% or less, furthermore having a circle equivalent diameter of undissolved spherical carbides of less than 0.2 μm, further having, as a metal structure, at least residual austenite in a volume rate of over 6% to 15%, having a prior austenite grain size number of #10 or more, and having a circle equivalent diameter of undissolved spherical carbides of less than 0.2 μm.

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Номер записи: 20
06-12-2012 дата публикации

Non-quenched and tempered steel having ultrafine grained pearlite structure and method of manufacturing the same

Номер: US20120305146A1
Автор: Joong Keun Park, Jun Ho Chung, Sung Hwan Park, Tae Hyung Kim, Young Sang Ko
Принадлежит: Hyundai Motor Co, Kia Motors Corp, Korea Advanced Institute of Science and Technology KAIST

This invention relates to a method of manufacturing non-quenched and tempered steel having an ultrafine grained pearlite structure, including hot forging a steel material so as to be high-temperature compression deformed, thus obtaining a hot forged body; rapidly cooling the hot forged body to a low-temperature pearlite transformation range, thus obtaining a supercooled hot forged body; isothermally holding the supercooled hot forged body in the low-temperature pearlite transformation range so as to be isothermally transformed; and air-cooling the hot forged body; and to non-quenched and tempered steel manufactured thereby.

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Номер записи: 21
13-12-2012 дата публикации

Joining of parts via magnetic heating of metal aluminum powders

Номер: US20120315493A1
Автор: Ian Baker
Принадлежит: Dartmouth College

A method of joining at least two parts includes steps of dispersing a joining material comprising a multi-phase magnetic metal-aluminum powder at an interface between the at least two parts to be joined and applying an alternating magnetic field (AMF). The AMF has a magnetic field strength and frequency suitable for inducing magnetic hysteresis losses in the metal-aluminum powder and is applied for a period that raises temperature of the metal-aluminum powder to an exothermic transformation temperature. At the exothermic transformation temperature, the metal-aluminum powder melts and resolidifies as a metal aluminide solid having a non-magnetic configuration.

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Номер записи: 22
27-12-2012 дата публикации

Seamless steel pipe for high-strength hollow spring

Номер: US20120325364A1
Автор: Hitoshi Hatano, Kotaro Toyotake, Takuya Kochi
Принадлежит: Kobe Steel Ltd

Disclosed is a seamless steel pipe for a high-strength hollow spring, which comprises 0.20 to 0.70 mass % of C, 0.5 to 3.0 mass % of Si, 0.1 to 3.0 mass % of Mn, 0.030 mass % or less (including 0%) of P, 0.030 mass % or less (including 0%) of S, 0.02 mass % or less (including 0%) of N, and the remainder made up by Fe and unavoidable impurities, and which is characterized in that carbide has an equivalent circle diameter of 1.00 μm or less. The seamless steel pipe enables the production of a hollow spring having high strength and excellent durability.

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Номер записи: 23
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: 24
03-01-2013 дата публикации

Ferritic stainless steel sheet excellent in oxidation resistance and ferritic stainless steel sheet excellent in heat resistance and method of production of same

Номер: US20130004360A1
Автор: Junichi Hamada, Norihiro Kanno, Yoshiharu Inoue
Принадлежит: Individual

Ferritic stainless steel sheet which has a high oxidation resistance and scale spallation resistance even at a high temperature near 1000° C., characterized by containing C: 0.020% or less, N: 0.020% or less, Si: over 0.10 to 0.35%, Mn: 0.10 to 0.60%, Cr: 16.5 to 20.0%, Nb: 0.30 to 0.80%, Mo: over 2.50 to 3.50%, and Cu: 1.00 to 2.50%, having an amount of increase of oxidation after a continuous oxidation test in the air at 1000° C. for 200 hours of 4.0 mg/cm 2 or less, and having an amount of scale spallation of 1.0 mg/cm 2 or less.

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Номер записи: 25
03-01-2013 дата публикации

Ferrite-based stainless steel for use in components of automobile exhaust system

Номер: US20130004361A1
Автор: Nobuhiko Hiraide, Shinichi Teraoka, Shunji Sakamoto
Принадлежит: Individual

This ferritic stainless steel for components of an automobile exhaust system includes, in terms of percent by mass: C: ≦0.015%; Si: 0.01% to 0.50%; Mn: 0.01% to 0.50%; P: ≦0.050%; S: ≦0.010%; N: ≦0.015%; Al: 0.010% to 0.100%; Cr: 16.5% to 22.5%; Ni: 0.5% to 2.0%; and Sn: 0.01% to 0.50%, and further includes either one or both of Ti: 0.03% to 0.30% and Nb: 0.03% to 0.30%, with a remainder being Fe and inevitable impurities.

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Номер записи: 26
03-01-2013 дата публикации

High-nitrogen stainless steel pipe with high strength, high ductility, and excellent corrosion and heat resistance and process for producing same

Номер: US20130004883A1
Автор: Harumatu Miura, Kazuo Oda
Принадлежит: ODA INDUSTRIES Co Ltd

Provided is a novel high-nitrogen stainless-steel pipe which is not obtained with any conventional technique, the stainless-steel pipe having high strength, high ductility, and excellent corrosion and heat resistance and being obtained through size reduction of crystal grains and strengthening by slight plastic working besides formation of a gradient structure in which the concentration of solid-solution nitrogen continuously decreases gradually from the surface. Also provided are hollow materials of various shapes and sizes which are formed from the steel pipe and processes for producing the steel pipe and the hollow materials. An austenitic stainless-steel pipe is treated in a range of the temperatures not higher than the critical temperature for crystal grain enlargement of the steel pipe material to cause nitrogen (N) to be absorbed into the surface of the pipe and diffused into the solid phase, while minimizing the enlargement of crystal grains during the treatment. Thus, a gradient structure is formed, the structure including a part that is close to the surface part of the pipe and has been highly strengthened by the formation of a high-concentration solid solution of N and a part in which ductility gradually increases toward around the center of the cross-section of the pipe as the N concentration decreases. Thereafter, the pipe is subjected to size reduction of crystal grains by utilizing, for example, eutectoid transformation of the austenite phase, thereby greatly improving the elongation (ductility) of the steel pipe. Furthermore, the steel pipe is strengthened by slight plastic working to give a high-nitrogen austenitic stainless-steel pipe having high strength, high ductility, and excellent corrosion and heat resistance. A plurality of the thus-obtained high-nitrogen austenitic stainless steel pipes of the same quality are disposed one over another so as to result in dimensions, e.g., diameter and wall thickness, according to the use or strength level, ...

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Номер записи: 27
10-01-2013 дата публикации

High-strength steel sheet and method for producing same

Номер: US20130008568A1
Автор: Daisuke Maeda, Genichi Shigesato, Kenichi Yamamoto, Naoki Yoshinaga, Satoshi Hirose, Yoshihiro SUWA
Принадлежит: Nippon Steel Corp

A high-strength steel sheet includes, by mass %, C: 0.03% to 0.30%, Si: 0.08% to 2.1%, Mn: 0.5% to 4.0%, P: 0.05% or less, S: 0.0001% to 0.1%, N: 0.01% or less, acid-soluble Al: more than 0.004% and less than or equal to 2.0%, acid-soluble Ti: 0.0001% to 0.20%, at least one selected from Ce and La: 0.001% to 0.04% in total, and a balance of iron and inevitable impurities, in which [Ce], [La], [acid-soluble Al], and [S] satisfy 0.02≦([Ce]+[La])/[acid-soluble Al]<0.25, and 0.4≦([Ce]+[La])/[S]≦50 in a case in which the mass percentages of Ce, La, acid-soluble Al, and S are defined to be [Ce], [La], [acid-soluble Al], and [S], respectively, and a microstructure includes 1% to 50% of martensite in terms of an area ratio.

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Номер записи: 28
28-02-2013 дата публикации

Spring steel and method for manufacturing the same

Номер: US20130048158A1
Автор: Hideto Kimura, Kazukuni Hase, Minoru Honjo
Принадлежит: JFE Steel Corp

Disclosed is high strength spring steel that can limit the depth of pitting occurring when corroded and therefore possesses high strength as well as excellent pitting corrosion resistance and corrosion fatigue property, with a composition containing: C: greater than 0.35 mass % and less than 0.50 mass %; Si: greater than L75 mass % and less than or equal to 3.00 mass %; Mn: 0.2 mass % to 1.0 mass %; Cr: 0.01 mass % to 0.04 mass %; P: 0.025 mass % or less; S: 0.025 mass % or less; Mo: 0.1 mass % to 1.0 mass %; and 0: 0.0015 mass % or less, under a condition that a PC value calculated by PC=4.2×([C]+[Mn])+0.1×(1/[Si]+1/[Mo])+20.3×[Cr]+0.001×(1/[N]) is greater than 3.3 and equal to or less than 8.0. Also disclosed is a preferred method for manufacturing the same.

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Номер записи: 29
07-03-2013 дата публикации

Automobile chassis part excellent in low cycle fatigue characteristics and method of production of same

Номер: US20130056115A1
Автор: Hideyuki Nakamura, Isao Anai, Takaaki Fukushi
Принадлежит: Individual

An automobile chassis part which is excellent in low cycle fatigue characteristics, characterized by being formed by steel which contains, by mass %, C: 0.02 to 0.10%, Si: 0.05 to 1.0%, Mn: 0.3 to 2.5%, P: 0.03% or less, S: 0.01% or less, Ti: 0.005 to 0.1%, Al: 0.005 to 0.1%, N: 0.0005 to 0.006%, and B: 0.0001 to 0.01 and has a balance of Fe and unavoidable impurities, in which 80% or more of the part structure comprises a bainite structure and in which a portion where a ratio R/t of the thickness “t” and external surface curvature radius R is 5 or less has an X-ray half width of an (211) plane of 5 (deg) or less.

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Номер записи: 30
11-04-2013 дата публикации

High strength steel sheet and method for manufacturing the same

Номер: US20130087253A1
Автор: Hiroshi Matsuda, Yasushi Tanaka, Yoshimasa Funakawa
Принадлежит: JFE Steel Corp

A high strength steel sheet has tensile strength of at least 1470 MPa and (tensile strength×total elongation) of at least 29000 MPa·% with a composition including, by mass %, C: 0.30% to 0.73%, Si: 3.0% or less, Al: 3.0% or less, Si+Al: at least 0.7%, Cr: 0.2% to 8.0%, Mn: 10.0% or less, Cr+Mn: at least 1.0%, P: 0.1% or less, S: 0.07% or less, N: 0.010% or less, and remainder as Fe and incidental impurities; and processing the steel sheet such that microstructure satisfies area ratio of martensite with respect to the microstructure of 15% to 90%; content of retained austenite of 10% to 50%; at least 50% of the martensite is constituted of tempered martensite and area ratio of the tempered martensite with respect to the microstructure is at least 10%; and area ratio of polygonal ferrite with respect to the microstructure is 10% or less.

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Номер записи: 31
18-04-2013 дата публикации

Martensitic antibacterial stainless steel and manufacturing method thereof

Номер: US20130092296A1
Автор: Dexin Qui
Принадлежит: Individual

This invention relates to antimicrobial martensitic stainless steels with nano precipitation and their manufacturing method of melting, forging, heat treatment. As the nano ε-Cu phases are precipitated in the matrix dispersedly, the martensitic stainless steels have excellent antimicrobial properties. The martensitic stainless steels may comprise from 0.35 to 1.20 weight percent C, from 12.00 to 26.90 weight percent Cr, from 0.29 to 4.60 weight percent Cu, 0.27 weight percent as less Ag, from 0.15 to 4.60 weight percent W, from 0.27 to 2.80 weight percent Ni, from 0.01 to 1.125 weight percent Nb, from 0.01 to 1.35 weight percent V, 1.8 percent or less Mn, from 0.15 to 4.90 weight percent Mo, 2.6 weight percent or less Si, 3.6 weight percent or less RE (rare earth) and the balance Fe and incidental impurities.

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Номер записи: 32
16-05-2013 дата публикации

Spring and manufacture method thereof

Номер: US20130118655A1
Автор: Kosuke Shibairi, Shimpei Kurokawa, Takeshi Suzuki, Yoshiki Ono
Принадлежит: NHK Spring Co Ltd

A spring consists of, by mass %, 0.5 to 0.7% of C, 1.0 to 2.0% of Si, 0.1 to 1.0% of Mn, 0.1 to 1.0% of Cr, not more than 0.035% of P, not more than 0.035% of S, and the balance of Fe and inevitable impurities. The spring has a structure including not less than 65% of bainite and 4 to 13% of residual austenite by area ratio in a cross section. The spring has a compressive residual stress layer in a cross section from a surface to a depth of 0.35 mm to D/4, in which D (mm) is a circle-equivalent diameter of the cross section. The spring has a high hardness layer with greater hardness than a center portion by 50 to 500 HV from a surface to a depth of 0.05 to 0.3 mm.

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Номер записи: 33
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: 34
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: 35
27-06-2013 дата публикации

Method for producing a tempered martensitic heat resistant steel for high temperature application

Номер: US20130160905A1
Автор: Cheng Liu, Peter Francis Morris, Philip Clarke, Urszula Alicja Sachadel
Принадлежит: TATA STEEL NEDERLAND TECHNOLOGY BV

A method for producing a tempered martensitic heat resistant steel for high temperature applications at an application temperature of up to 650° C. and to a steel produced by the method. The use of the steel in the production of components for high temperature applications such as turbine blades or casings, bolting and boiler tubes, heat exchangers or other elements in power generation systems.

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Номер записи: 36
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: 37
04-07-2013 дата публикации

Steel part for machine structural use and manufacturing method thereof

Номер: US20130167986A1
Автор: Hiromasa Takada, Manabu Kubota, Shinya Teramoto
Принадлежит: Nippon Steel and Sumitomo Metal Corp

The present invention provides a steel part for machine structural use whose fatigue strength and toughness are improved and a manufacturing method thereof. A steel part made of a steel containing, in mass %, C: 0.05 to 0.20%, Si: 0.10 to 1.00%, Mn: 0.75 to 3.00%, P: 0.001 to 0.050%, S: 0.001 to 0.200%, V: exceeding 0.25 to 0.50%, Cr: 0.01 to 1.00%, Al: 0.001 to 0.500%, and N: 0.0080 to 0.0200%, and a balance being composed of Fe and inevitable impurities, in which a steel structure contains a bainite structure having an area ratio of 95% or more, a bainite lath width is 5 μm or less, V carbide having an average grain diameter of not less than 4 nm nor more than 7 nm dispersedly exists in the bainite structure, and an area ratio of V carbide in the bainite structure is 0.18% or more.

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Номер записи: 38
18-07-2013 дата публикации

Press-formed product and method for producing same

Номер: US20130180635A1
Автор: Junya Naitou, Keisuke Okita, Shushi Ikeda
Принадлежит: Kobe Steel Ltd

There is provided a useful method for producing a press-formed product without causing disadvantages such as hardness variation, which product has favorable formability in a level so as to be able to be produced by deep drawing, and which method is carried out by heating a thin steel sheet to a temperature not lower than an Ac 3 transformation point thereof; and then cooling the thin steel sheet at a rate not lower than a critical cooling rate, during which the thin steel sheet is formed into the press-formed product, wherein the forming is started from a temperature higher than a martensitic transformation start temperature Ms thereof, the cooling rate is kept to be 10° C./sec. or higher during the forming, and the forming is finished in a temperature range not higher than the martensitic transformation start temperature Ms.

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Номер записи: 39
25-07-2013 дата публикации

Carburizing steel having excellent cold forgeability and method of manufacturing the same

Номер: US20130186522A1
Автор: Katsuyuki Ichimiya, Shinji Mitao
Принадлежит: JFE Steel Corp

A carburizing steel has a composition containing, in mass %, C: 0.1-0.35%; Si: 0.01-0.22%; Mn: 0.3-1.5%; Cr: 1.35-3.0%; P: 0.018% or less; S: 0.02% or less; Al: 0.015-0.05%; N: 0.008-0.015%; and O: 0.0015% or less, each being contained in an amount within a range satisfying formulas (1), (2) and (3) below, and the balance of the composition being Fe and incidental impurities, and the carburizing steel having microstructures before spheroidizing annealing such that a total microstructure proportion of ferrite and pearlite is 85% or more and an average ferrite grain size is 25 μm or less. 3.1≧{([% Si]/2)+[% Mn]+[% Cr]}≧2.2   (1) [% C]−([% Si]/2)+([% Mn]/5)+2[% Cr]≧3.0   (2) 2.5≧[% Al]/[% N]≧1.7   (3) [% M] represents content (in mass %) of element M.

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Номер записи: 40
08-08-2013 дата публикации

Method for manufacturing hot stamped body having vertical wall and hot stamped body having vertical wall

Номер: US20130199676A1
Автор: Kunio Hayashi, Toshimasa Tomokiyo, Toshimitsu Aso
Принадлежит: Individual

The present invention provides a method for manufacturing a hot stamped body having a vertical wall, the method including: a hot-rolling step; a coiling step; a cold-rolling step; a continuous annealing step; and a hot stamping step, in which the continuous annealing step includes a heating step of heating the cold-rolled steel sheet to a temperature range of equal to or higher than Ac 1 ° C. and lower than Ac 3 ° C.; a cooling step of cooling the heated cold-rolled steel sheet from the highest heating temperature to 660° C. at a cooling rate of equal to or less than 10° C./s; and a holding step of holding the cooled cold-rolled steel sheet in a temperature range of 550° C. to 660° C. for one minute to 10 minutes.

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Номер записи: 41
22-08-2013 дата публикации

Method for producing alloy

Номер: US20130213531A1
Автор: Jun Tamai, Toshiya Inoue
Принадлежит: Canon Inc

To provide an alloy which can suppress minute temporal deformation of a Super Invar alloy as much as possible, and a method for producing the alloy. The alloy of the present invention includes iron, nickel, and cobalt, which are the basic components of a Super Invar alloy, and is characterized in that an amount of a fraction which has not carbidized in carbon contained in the alloy is 0.010 wt % or less.

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Номер записи: 42
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: 43
12-09-2013 дата публикации

High hardness, high toughness iron-base alloys and methods for making same

Номер: US20130233454A1
Автор: Glenn J. Swiatek, Ronald E. Bailey, Thomas R. Parayil
Принадлежит: ATI Properties LLC

An aspect of the present disclosure is directed to low-alloy steels exhibiting high hardness and an advantageous level of multi-hit ballistic resistance with low or no crack propagation imparting a level of ballistic performance suitable for military armor applications. Various embodiments of the steels according to the present disclosure have hardness in excess of 550 BHN and demonstrate a high level of ballistic penetration resistance relative to conventional military specifications.

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Номер записи: 44
19-09-2013 дата публикации

High strength galvanized steel sheet having excellent formability and method for manufacturing the same

Номер: US20130244056A1
Автор: Hidetaka Kawabe, Kazuhiro Seto, Kenji Kawamura
Принадлежит: JFE Steel Corp

A high strength galvanized steel sheet having excellent formability, includes a steel sheet which is a base sheet and a galvanized layer on a surface of the steel sheet, wherein the steel sheet is a high strength steel sheet which has a composition including, by mass %, 0.08 to 0.15% of C, 0.5 to 1.5% of Si, 0.5 to 1.5% of Mn, 0.1% or less of P, 0.01% or less of S, 0.01 to 0.1% of Al, 0.005% or less of N, and the balance Fe with inevitable impurities, and a microstructure composed of 75 to 90% of a ferrite phase as a main phase and 10 to 25% of a second phase including at least pearlite in terms of an area fraction with respect to the entire microstructure; an average grain size of the pearlite is 5 μm or smaller; and the pearlite has an area fraction of 70% or greater with respect to the total area of the second phase.

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Номер записи: 45
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: 46
31-10-2013 дата публикации

Spring having excellent corrosion fatigue strength

Номер: US20130285299A1
Автор: Masami Wakita, Takanori Kuno
Принадлежит: Chuo Hatsujo KK

A spring has a Rockwell hardness of HRC 53 to HRC 56 and a dislocation density ρ (cm −2 ) that satisfies the formula ρ≧1.4×10 11 ×H−6.7×10 12 in the Rockwell hardness range of HRC 53 to HRC 56, in which H is the Rockwell hardness. The spring also has a prior austenite grain size number of 10 or higher.

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Номер записи: 47
28-11-2013 дата публикации

Bulk nano-structured low carbon steel and method of manufacturing the same

Номер: US20130312480A1
Автор: Jiaqing Yu, Ke Lu, Lixin Sun, Matthias Kuntz, Nairong Tao
Принадлежит: ROBERT BOSCH GMBH

A method of manufacturing bulk nano-structured low carbon steel includes: preparing a blank of bulk low carbon steel; impacting the blank of bulk low carbon steel by using a compression device, so as to force the blank of bulk low carbon steel to perform a deformation at a high strain rate normally in a range of 10 2 -10 3 /s, so that the microstructure of the blank of bulk low carbon steel is nano-structured, that is, bulk nano-structured low carbon steel is thus manufactured. The bulk nano-structured low carbon steel is a plate having a thickness of not less than 5 mm or a bar having a diameter of not less than 5 mm.

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Номер записи: 48
26-12-2013 дата публикации

Material with high resistance to wear

Номер: US20130343944A1
Автор: Devrim Caliskanoglu, Gert Kellezi
Принадлежит: Boehler Edelstahl GmbH and Co KG

Material and method for the production of material with isotropic, mechanical properties and improved wear resistance and high hardness potential. Method includes producing in a powder metallurgical (PM) method a slug or ingot from a material of ledeburite tool steel alloy, and subjecting one of the slug or ingot or a semi-finished product produced from the slug or ingot to full annealing at a temperature of over 1100° C., but at least 10° C. below the fusing temperature of the lowest melting structure phase with a duration of over 12 hrs. In this manner, an average carbide phase size of the material is increased by at least 65%, a surface shape of the material is rounded and a matrix is homogenized. Method further includes subsequently processing the material into thermally tempered tools with high wear resistance occurs or into parts to which abrasive stress is applied.

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Номер записи: 49
09-01-2014 дата публикации

Method for Producing a Hot-Rolled Flat Steel Product

Номер: US20140007992A1
Автор: Evgeny BALICHEV, Harald Hofmann, Jian Bian
Принадлежит: THYSSENKRUPP STEEL EUROPE AG

A method for generating a flat steel product comprising the steps of: melting a steel melt, comprising, in addition to Fe and unavoidable impurities (in wt %) C: 0.5-1.3%, Mn: 18-26%, Al: 5.9-11.5%, Si: <1%, Cr: <8%, Ni: <3%, Mo: <2%, N: <0.1%, B: <0.1%, Cu: <5%, Nb: <1%, Ti: <1%, V: <1%, Ca: <0.05%, Zr: <0.1%, P: <0.04%, S: <0.04%; casting the steel melt into a cast strip; heating the cast strip to an initial hot-rolling temperature of 1100-1300° C. at a heating rate of at least 20 K/s; hot rolling the cast strip into a hot strip; cooling the hot strip within 10 seconds after the hot rolling at a cooling rate of at least 100 K/s to <400° C.; and winding the cooled hot strip into a coil at a coiling temperature of up to 400° C.

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Номер записи: 50
23-01-2014 дата публикации

Ferritic stainless steel sheet excellent in heat resistance and workability and method of production of same

Номер: US20140023550A1
Автор: Junichi Hamada, Norihiro Kanno, Yoshiharu Inoue
Принадлежит: Individual

The present invention provides ferritic stainless steel sheet which is excellent in heat resistance at 950° C. and workability at ordinary temperature, that is, ferritic stainless steel sheet excellent in heat resistance and workability which is characterized by containing, by mass %, C: 0.02% or less, N: 0.02% or less, Si: over 0.1 to 1.0%, Mn: 0.5% or less, P: 0.020 to 0.10%, Cr: 13.0 to 20.0%, Nb: 0.5 to 1.0%, Cu: 1.0 to 3.0%, Mo: 1.5 to 3.5%, W: 2.0% or less, B: 0.0001 to 0.0010%, and Al: 0.01 to 1.0% and having a balance of Fe and unavoidable impurities, where Mo+W is made 2.0 to 3.5%.

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Номер записи: 51
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: 52
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: 53
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: 54
06-03-2014 дата публикации

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

Номер: US20140065007A1
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 martensite at 80% to 97% by area and retained austenite at 3% to 20% by area, the remainder structure of which is at 5% by area or lower, 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: 55
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: 56
01-01-2015 дата публикации

Cold-Rolled Flat Steel Product and Method for its Production

Номер: US20150000797A1
Автор: Ebest Sigrun, Follner Stefan, Mattissen Dorothea, Sebald Roland
Принадлежит: THYSSENKRUPP STEEL EUROPE AG

The invention relates to a cold-rolled flat steel product which, despite high strength values, has a high level of deformability characterised by a high elongation at break and a good hole expansion ratio A. For this purpose the flat steel product is produced from a steel that is composed of (in % by weight) C: 0.12-0.19%, Mn: 1.5-2.5%, Si: >0.60-1.0%, Al: ≦0.1%, Cr: 0.2-0.6%, Ti: 0.05-0.15% with the remainder being iron and unavoidable impurities caused by the production process, and which comprises a perlite- and bainite-free structure having 4-20% by vol. martensite, 2-15% by vol. residual austenite, remainder ferrite, an elongation at break A80 of at least 15%, a tensile strength Rm of at least 880 MPa, a yield strength ReL of at least 550 MPa and a hole expansion ratio λof more than 6%. The invention also relates to a method which easily enables production of a flat steel product according to the invention. 1. Cold-rolled flat steel product , whichis produced from a steel that is composed of (in % by weight)C: 0.12-0.19%,Mn: 1.5-2.5%,Si: >0.60-1.0%Al: ≦0.1%,Cr: 0.2-0.6%,Ti: 0.05-0.15%with the remainder being iron and unavoidable impurities caused by the production process, and which comprisesa perlite- and bainite-free structure having 4-20% by vol. martensite, 2-15% by vol. residual austenite, remainder ferrite,an elongation at break A80 of at least 15%,a tensile strength Rm of at least 880 MPa,a yield strength ReL of at least 550 MPa and{'sub': 'M', 'a hole expansion ratio λof more than 6%.'}2. Cold-rolled flat steel product according to claim 1 , characterised in that its Si content is at least 0.65% by weight.3. Cold-rolled flat steel product according to claim 1 , characterised in that its Ti content is at least 0.07% by weight.4. Method for producing a cold-rolled flat steel product created according to claim 1 , comprising the following steps:casting a steel melt which is composed of (in % by weight)C: 0.12-0.19%,Mn: 1.5-2.5%,Si: >0.60-1.0%Al: ≦0.1%,Cr: ...

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Номер записи: 57
01-01-2015 дата публикации

Hot-press formed product and method for manufacturing same

Номер: US20150000802A1
Автор: Junya Naitou, Keisuke Okita, Shushi Ikeda, Toshio Murakami
Принадлежит: Kobe Steel Ltd

Provided is a hot-press molded article that can achieve a high level of balance between high strength and extension by region and has a region corresponding to an energy absorption site and a shock resistant site within a single molded article without applying a welding method by means of having first region having a metal structure containing both 80-97 area % of martensite and 3-20 area % of residual austenite, the remaining structure comprising no more than 5 area %, and a second region having a metal structure comprising 30-80 area % of ferrite, less than 30 area % (exclusive of 0 area %) of bainitic ferrite, no greater than 30 area % (exclusive of 0 area %) of martensite, and 3-20 area % of residual austenite.

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Номер записи: 58
06-01-2022 дата публикации

HOT-ROLLED STEEL SHEET WITH EXCELLENT LOW-TEMPERATURE IMPACT TOUGHNESS AND MANUFACTURING METHOD THEREFOR

Номер: US20220002828A1
Автор: KONG Jung Hyun, LEE Mun-Soo
Принадлежит:

Disclosed are a hot-rolled steel sheet having a thickness of 6 mm or more and an excellent impact property, and a manufacturing method thereof. 1. A hot-rolled steel sheet with excellent low-temperature impact toughness , the hot-rolled steel sheet comprising , in percent (%) by weight of the entire composition , C: more than 0 and 0.03% or less , Si: 0.1 to 1.0% , Mn: more than 0 and 2.0% or less , P: 0.04% or less , Cr: 1.0 to 10% , Ni: more than 0 and 1.5% or less , Ti: 0.01 to 0.5% , Cu: more than 0 and 2.0% or less , N: more than 0 and 0.03% or less , Al: 0.1% or less , the remainder of iron (Fe) and other inevitable impurities ,a value of the following Formula (1) satisfies 200 to 1,150, and {'br': None, '1001.5*C+1150.6*Mn+2000*Ni+395.6*Cu−0.7*Si−1.0*Ti−45*Cr−1.0*P−1.0*Al+1020.5*N\u2003\u2003(1)'}, 'a microstructure of the cross-section perpendicular to the rolling direction has an average grain size of 50 μm or less in which a misorientation between grains is 5° or more.'}(Here, C, Mn, Ni, Cu, Si, Ti, Cr, P, Al and N mean the content (% by weight) of each element)2. The hot-rolled steel sheet according to claim 1 , wherein the hot-rolled steel sheet has a thickness of 6.0 to 25.0 mm and −20° C. Charpy impact energy of 100 J/cmor more.3. The hot-rolled steel sheet according to claim 1 , wherein the value of Formula (1) satisfies 200 to 700.4. The hot-rolled steel sheet according to claim 1 , wherein the hot-rolled steel sheet satisfies the following Formula (2).{'br': None, 'Ti/(C+N)≥10.0\u2003\u2003(2)'}5. The hot-rolled steel sheet according to claim 1 , wherein the microstructure has an average grain size of 70 μm or less in which a misorientation between grains is 15 to 180°.6. The hot-rolled steel sheet according to claim 1 , wherein the microstructure has an average grain size of 50 μm or less in which a misorientation between grains is 5 to 180°.7. The hot-rolled steel sheet according to claim 1 , wherein the microstructure has an average grain size of ...

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Номер записи: 59
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: 60
06-01-2022 дата публикации

LOW-YIELD-RATIO ULTRA-HIGH-STRENGTH HIGH-TOUGHNESS STEEL FOR PRESSURE HULLS AND PREPARATION METHOD THEREFOR

Номер: US20220002849A1
Автор: KAN Liye, Tian Yong, WANG Qinghai, Wang Yimin, WANG Zhaodong, YE Qibin, ZHOU Cheng
Принадлежит:

The present invention discloses a low-yield-ratio ultra-high-strength high-toughness steel for pressure hulls and a preparation method therefor, wherein the chemical components by weight percentage are: 0.05%-0.10% of C, 0.15%-0.35% of Si, 0.60%-1.00% of Mn, 0.10%-0.50% of Cu, 0.10%-1.00% of Mo, 0.40%-0.70% of Cr, 0.05%-0.15% of V, 5.00%-10.00% of Ni, and the balance of Fe and unavoidable impurities. The technical solution of the present invention adopts secondary quenching heat treatment, the first quenching is performed to achieve complete austenitizing, and then the second quenching and tempering are performed to finally obtain complex phase structures such as tempered martensite, critical ferrite and retained austenite, so as to meet the performance index requirements of low yield ratio, ultra-high strength and high toughness, and thereby promoting application in practice. 1. A preparation method for a low-yield-ratio ultra-high-strength high-toughness steel for pressure hulls , comprising the following steps:step 1, meltingmelting to obtain a casting blank using the following chemical components by weight percentage: 0.05%-0.10% of C, 0.15%-0.35% of Si, 0.60%-1.00% of Mn, 0.10%-0.50% of Cu, 0.10%-1.00% of Mo, 0.40%-0.70% of Cr, 0.05%-0.15% of V, 5.00%-10.00% of Ni, and the balance of Fe and unavoidable impurities.step 2, hot rollingkeeping the casting blank obtained in step 1 at 1150° C.-1220° C. for soaking, and then performing hot rolling; the hot rolling adopts a two-stage rolling process; the rolling temperature of the first stage is 1150° C.-1000° C., and the reduction is ≥50%; the rolling temperature of the second stage is 900° C.-750° C., and the reduction is ≥50%; the final rolling thickness is 5-80 mm; and air cooling a high-temperature steel plate after the hot rolling to room temperature;step 3, heat treatmentheating a sample of the hot-rolled steel plate in step 2 to 790° C.-810° C., soaking for 20-40 minutes, and water quenching to room temperature ...

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Номер записи: 61
03-01-2019 дата публикации

Method for producing a pre-coated metal sheet

Номер: US20190001438A1
Автор: Ehling Wolfram
Принадлежит: ArcelorMittal

This method for preparing a pre-coated metal sheet for welding thereof to another pre-coated metal sheet, containing the following successive steps: 133-. (canceled)34. A method for preparing a pre-coated metal sheet for welding thereof to another pre-coated metal sheet , comprising the following successive steps:providing a pre-coated metal sheet comprising a metal substrate provided, on at least one of its faces, with a pre-coating layer, thenremoving, on at least one face of said pre-coated metal sheet, at least part of said pre-coating layer so as to form a removal zone, said removal being done by an impact of a laser beam on said pre-coating layer, the removal step comprising, over the course of the removal, the relative displacement of said laser beam with respect to the metal sheet in a direction of advance,wherein during the removal, the laser beam is inclined relative to the face of the metal sheet such that the orthogonal projection of the laser beam on said face of the metal sheet is located in the zone of the metal sheet in which the removal has already been done, and wherein the laser beam forms an angle of inclination comprised between 12° and 50° with the direction normal to the face of the metal sheet.35. The method according to claim 34 , wherein the pre-coating layer is a layer of aluminum claim 34 , an aluminum-based layer or a layer of aluminum alloy.36. The method according to claim 34 , wherein the pre-coating layer is a layer of aluminum alloy further comprising silicon.37. The method according to claim 34 , wherein the angle of inclination of the laser beam is comprised between 15° and 45°.38. The method according to claim 34 , wherein the angle of inclination of the laser beam is comprised between 20° and 40°.39. The method according to claim 34 , wherein the angle of inclination of the laser beam is comprised between 25° and 40°.40. The method according to claim 34 , wherein the angle of inclination of the laser beam is comprised between 25 ...

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Номер записи: 62
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: 63
05-01-2017 дата публикации

ULTRAHIGH-STRENGTH STEEL FOR WELDING STRUCTURE WITH EXCELLENT TOUGHNESS IN WELDING HEAT-AFFECTED ZONES THEREOF, AND METHOD FOR MANUFACTURING SAME

Номер: US20170002435A1
Автор: JEONG Hong-Chul, KIM Ho-Soo
Принадлежит:

Provided is a ultrahigh strength steel for a welded structure having superior toughness in a weld heat-affected zone (HAZ) comprising: by wt %, carbon (C): 0.05% to 0.15%, silicon (Si): 0.1% to 0.6%, manganese (Mn): 1.5% to 3.0%, nickel (Ni): 0.1% to 0.5%, molybdenum (Mo): 0.1% to 0.5%, chromium (Cr): 0.1% to 1.0%, copper (Cu): 0.1% to 0.4%, titanium (Ti): 0.005% to 0.1%, niobium (Nb): 0.01% to 0.03%, boron (B): 0.0003% to 0.004%, aluminum (Al): 0.005% to 0.1%, nitrogen (N): 0.001% to 0.006%, phosphorus (P): 0.015% or less, sulfur (S): 0.015% or less, iron (Fe) as a residual component thereof, and inevitable impurities. 1. A ultrahigh strength steel for a welded structure having superior toughness in a weld heat-affected zone (HAZ) comprising:by wt %, carbon (C): 0.05% to 0.15%, silicon (Si): 0.1% to 0.6%, manganese (Mn): 1.5% to 3.0%, nickel (Ni): 0.1% to 0.5%, molybdenum (Mo): 0.1% to 0.5%, chromium (Cr): 0.1% to 1.0%, copper (Cu): 0.1% to 0.4%, titanium (Ti): 0.005% to 0.1%, niobium (Nb): 0.01% to 0.03%, boron (B): 0.0003% to 0.004%, aluminum (Al): 0.005% to 0.1%, nitrogen (N): 0.001% to 0.006%, phosphorus (P): 0.015% or less, sulfur (S): 0.015% or less, iron (Fe) as a residual component thereof, and inevitable impurities,wherein the Ti and N component contents satisfy Formula 1 below, the N and B component contents satisfy Formula 2 below, and the Mn, Cr, Mo, Ni, and Nb component contents satisfy Formula 3 below; and [{'br': None, '3.5≦Ti/N≦7.0 \u2003\u2003[Formula 1]'}, {'br': None, '1.5≦N/B≦4.0 \u2003\u2003[Formula 2]'}, {'br': None, '4.0 2≦Mn+Cr+Mo+Ni+3Nb≦7.0 \u2003\u2003[Formula 3]'}], 'a microstructure including, by area fraction, acicular ferrite in an amount of 30% to 40% and bainite in an amount of 60% to 70%,'}wherein in the Formulas 1 to 3, respective component units are wt %.2. The ultrahigh strength steel for a welded structure having superior toughness in a weld HAZ of claim 1 , wherein the steel further comprises claim 1 , by wt % claim 1 , one or ...

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Номер записи: 64
05-01-2017 дата публикации

FERRITIC LIGHTWEIGHT STEEL SHEET HAVING EXCELLENT STRENGTH AND DUCTILITY AND METHOD FOR MANUFACTURING THE SAME

Номер: US20170002436A1
Автор: Kim Han Soo, KIM Nack Joon, KOO Min Seo, SON Chang Young, ZARGARAN Alireza
Принадлежит:

A ferritic steel sheet according to an exemplary embodiment of the present invention includes C at 0.01 to 0.3 wt %, Mn at 0.5 to 8 wt %, Al at 5 to 12 wt %, and Nb at 0.015 to 0.2 wt % based on an entire composition of 100 wt %, and a remaining part of Fe and an impurity. 1. A ferritic steel sheet including C at 0.01 to 0.3 wt % , Mn at 0.5 to 8 wt % , Al at 5 to 12 wt % , and Nb at 0.015 to 0.2 wt % based on an entire composition of 100 wt % , and a remaining part of Fe and an impurity ,wherein an average grain size of a ferrite crystal existing in the steel sheet is 30 μm or less.2. The ferritic steel sheet of claim 1 , wherein:the average grain size of the ferrite crystal is 15 μm or less.3. The ferritic steel sheet of claim 1 , wherein:the ferritic steel sheet includes Si at 0.04 to 2.0 wt %, Cr at 2.0 wt % or less (0% is not included), Mo at 1.0 wt % or less (0% is not included), Ni at 1.0 wt % or less (0% is not included), Ti at 0.1 wt % or less (0% is not included), V at 0.2 wt % or less (0% is not included), B at 0.01 wt % or less (0% is not included), Zr at 0.2 wt % or less (0% is not included), or a combination thereof based on the entire composition of 100 wt %.4. The ferritic steel sheet of claim 1 , wherein:a κ-carbide of a spherical shape, an oval shape, an acicular shape, or a band shape existing inside the ferritic steel sheet is included.5. The ferritic steel sheet of claim 4 , wherein:the κ-carbide at 1 to 10 vol % is included based on the entire 100 vol % of the steel sheet.6. The ferritic steel sheet of claim 4 , wherein:a particle size of the κ-carbide is in a range of 20 nm to 10 μm, and{'sup': 3', '6', '2, 'the κ-carbide is present in the range of 5×10to 1×10particles per unit area (mm).'}7. The ferritic steel sheet of claim 1 , wherein:a NbC compound existing inside the ferritic steel sheet is included.8. The ferritic steel sheet of claim 7 , wherein:the NbC compound at 0.1 to 1 vol % is included based on the entire 100 vol % of the steel ...

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Номер записи: 65
05-01-2017 дата публикации

METHOD FOR OPTIMALLY PRODUCING METAL STEEL AND IRON ALLOYS IN HOT-ROLLED AND THICK PLATE FACTORIES USING A MICROSTRUCTURE SIMULATOR, MONITOR, AND/OR MODEL

Номер: US20170002440A1
Автор: Hassell Christoph, SPROCK August
Принадлежит: SMS group GmbH

In a method for controlling a metallurgical production plant by means of a microstructure model, which comprises a program which calculates at least one mechanical strength property of a product being produced, which program calculates the strength property on the basis of calculated metallurgical phase components of the microstructure of the produced product, wherein the metallurgical plant comprises a terminating cooling line, and wherein operating parameters for the metallurgical plant with adjustable output values, which are established at least partially in advance, are factored into the calculation of the mechanical strength property, the object of the method is to enable an advantageous adjustment of operating parameters in order to achieve desired mechanical strength properties in a product consisting of a metal steel and/or iron alloy. This object is achieved in that, as the operating parameters that are factored into the calculation of the strength property, the mass fraction of at least one alloy element that is present in the chemical composition of the metal steel and/or iron alloy being used, and at least one additional operating parameter, preferably a cooling rate which is set as part of a cooling process carried out after a rolling process, are detected, and an increase in the strength property in question of the produced product, said increase being achieved by modifying at least said additional operating parameter, is at least partially compensated for by reducing the mass fraction of one or more of the alloying elements of the metal steel and/or iron alloy being used. 14-. (canceled)5. The method according to claim 14 , characterized in that the program comprises a mathematical term and/or algorithm for expressing the impact of mass fractions of alloying elements in the chemical composition of the metal steel and/or iron alloy being used on the yield strength of the finished product.6. The method according to claim 5 , characterized in that the ...

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Номер записи: 66
05-01-2017 дата публикации

Quench and temper corrosion resistant steel alloy

Номер: US20170002447A1
Автор: David E. Wert
Принадлежит: CRS Holdings LLC

A quench and temper steel alloy is disclosed having the following composition in weight percent. C 0.2-0.5 Mn 0.1-1.0 Si 0.1-1.2 Cr   9-14.5 Ni 2.0-5.5 Mo 1-2 Cu   0-1.0 Co 1-4 W 0.2 max. V 0.1-1.0 Ti up to 0.5 Nb   0-0.5 Ta   0-0.5 Al   0-0.25 Ce   0-0.01 La   0-0.01 The balance of the alloy is iron and the usual impurities including not more than about 0.01% phosphorus, not more than about 0.010% sulful, and not more than about 0.10% nitrogen. A quenched and tempered steel article made from this alloy is also disclosed. The steel article is characterized by a tensile strength of at least about 290 ksi, a fracture toughness (k Ic ) of at least about 65 ksi, good resistance to general corrosion, and good resistance to pitting corrosion.

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Номер записи: 67
04-01-2018 дата публикации

HIGH-STRENGTH COLD ROLLED STEEL SHEET WITH LOW MATERIAL NON-UNIFORMITY AND EXCELLENT FORMABILITY, HOT DIPPED GALVANIZED STEEL SHEET, AND MANUFACTURING METHOD THEREFOR

Номер: US20180002771A1
Автор: HAN Sang-Ho, HAN Seong-Ho
Принадлежит:

A high-strength cold-rolled steel sheet and a hot-dipped galvanized steel sheet with low deviation of material properties and excellent formability, and a method for manufacturing same are provided. The present invention relates to a low-yield-ratio high-strength cold-rolled steel sheet with low deviation of directional material and excellent formability, comprising 0.05-0.15 wt % of C, 0.2-1.5 wt % of Si, 2.2-3.0 wt % of Mn, 0.001-0.10 wt % of P, 0.010 wt % or less of S, 0.01-0.10 wt % of sol.Al, 0.010 wt % or less of N, and the balance of Fe and impurities, satisfying Si/(Mn+Si)≦0.5, wherein the microstructure of the steel sheet includes 40% or more of ferrite, 10% or less of bainite, 3% or less of residual austenite, and a balance of martensite, and the area fraction of a Mn band present in the martensite phase is 5% or less. 1. A low-yield-ratio high-strength cold-rolled steel sheet with low deviation of directional material and excellent formability , the cold-rolled steel sheet comprising:by wt %, 0.05 to 0.15% of C, 0.2 to 1.5% of Si, 2.2 to 3.0% of Mn, 0.001 to 0.10% of P, 0.010% or less of S, 0.01 to 0.10% of sol.Al, 0.010% or less of N, and a balance of Fe and impurities, satisfying a condition of Si/(Mn+Si)≦0.5,wherein the cold-rolled steel sheet has a microstructure including 40% or more of ferrite, 10% or less of bainite, 3% or less of retained austenite, and a balance of martensite, and the fraction of a Mn band present within the martensite is 5% or less.2. The cold-rolled steel sheet of claim 1 , wherein each of tensile strength TS(tr.)-TS(lo.) and yield strength YS(tr.)-YS(lo.) is 50 MPa or lower claim 1 , respectively claim 1 , where tr refers to a direction perpendicular to a rolling direction and lo refers to the rolling direction.3. The cold-rolled steel sheet of claim 1 , further comprising at least one of Ti or Nb in an amount of 0.05% or less.4. The cold-rolled steel sheet of claim 1 , further comprising at least one of 0.1 to 0.7% of Cr or 0 ...

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Номер записи: 68
04-01-2018 дата публикации

HIGH-STRENGTH STEEL SHEET AND METHOD FOR MANUFACTURING THE SAME

Номер: US20180002778A1
Автор: Funakawa Yoshimasa, Kariya Nobusuke, KAWAMURA Kenji, MORI Kazuma, Ono Yoshihiko, Sugihara Reiko
Принадлежит: JFE STEEL CORPORATION

Provided are a high-strength steel sheet and a method for manufacturing the steel sheet. The high-strength steel sheet has a specified chemical composition with the balance being Fe and inevitable impurities, a microstructure including, in terms of area ratio, 25% or less of a ferrite phase, 75% or more of a bainite phase and/or a martensite phase, and 5% or less of cementite, in which, in a surface layer that is a region within 50 μm from the surface in the thickness direction, the area ratio of a ferrite phase is 5% to 20%, and a tensile strength is 1180 MPa or more. 1. A high-strength steel sheet havinga chemical composition containing, by mass %, C: 0.100% to 0.150%, Si: 0.30% to 0.70%, Mn: 2.20% to 2.80%, P: 0.025% or less, S: 0.0020% or less, Al: 0.020% to 0.060%, N: 0.0050% or less, Nb: 0.010% to 0.060%, Ti: 0.010% to 0.030%, B: 0.0005% to 0.0030%, Sb: 0.005% to 0.015%, Ca: 0.0015% or less, and the balance being Fe and inevitable impurities,a microstructure including, in terms of area ratio, 25% or less of a ferrite phase, 75% or more of a bainite phase and/or a martensite phase, and 5% or less of cementite,wherein, in a surface layer that is a region within 50 μm from the surface in the thickness direction, the area ratio of a ferrite phase is 5% to 20%, anda tensile strength being 1180 MPa or more.2. The high-strength steel sheet according to claim 1 , wherein the chemical composition further contains at least one element selected from at least one group consisting of claim 1 , by mass % claim 1 ,Group I: one or more elements selected from Cr: 0.30% or less V: 0.10% or less Mo: 0.20% or less, Cu: 0.10% or less, and Ni: 0.10% or less, andGroup II: REM: 0.0010% to 0.0050%.3. The high-strength steel sheet according to claim 1 , the steel sheet further having a YR of 0.85 or less.4. The high-strength steel sheet according to claim 2 , the steel sheet further having a YR of 0.85 or less.5. A method for manufacturing a high-strength steel sheet having a tensile ...

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Номер записи: 69
04-01-2018 дата публикации

HIGH STRENGTH GALVANIZED STEEL SHEET HAVING EXCELLENT SURFACE QUALITIES, PLATING ADHESION, AND FORMABILITY, AND METHOD FOR MANUFACTURING SAME

Номер: US20180002790A1
Автор: KANG Ki-Cheol, Kim Jong-ho, Kim Myung-Soo
Принадлежит: POSCO

A high strength galvanized steel sheet having excellent surface qualities, plating adhesion, and formability is provided, wherein a galvanized layer is formed on a cold-rolled steel sheet comprising 0.1-0.3 wt % of C, 1-2.5 wt % of Si, 2.5-8 wt % of Mn, 0.001-0.5 wt % of sol. Al, at most 0.04 wt % of P, at most 0.015 wt % of S, at most 0.02 wt % of N (excluding 0 wt %), 0.1-0.7 wt % of Cr, at most 0.1 wt % of Mo, (48/14)*[N] to 0.1 wt % of Ti, 0.005-0.5 wt % of Ni, 0.01-0.07 wt % of Sb, at most 0.1 wt % of Nb, and at most 0.005 wt % of B, with the remainder being Fe and other inevitable impurities. 1. A high strength galvanized steel sheet having excellent surface qualities , plating adhesion , and formability ,wherein a galvanized layer is formed on a cold-rolled steel sheet comprising 0.1-0.3 wt % of C, 1-2.5 wt % of Si, 2.5-8 wt % of Mn, 0.001-0.5 wt % of sol. Al, 0.04 wt % or less of P, 0.015 wt % or less of S, 0.02 wt % or less of N (excluding 0 wt %), 0.1-0.7 wt % of Cr, 0.1 wt % or less of Mo, (48/14)*[N] to 0.1 wt % of Ti, 0.005-0.5 wt % of Ni, 0.01-0.07 wt % of Sb, 0.1 wt % or less of Nb, and 0.005 wt % or less of B, with the remainder being Fe and other inevitable impurities, and the average content of Sb in the galvanized layer from the surface of the cold-rolled steel sheet to a depth of 0.1 μm is at least 1.5 times that at a depth of 0.5 μm or more from the surface of the cold-rolled steel sheet.2. The high strength galvanized steel sheet of claim 1 , wherein a microstructure of the cold-rolled steel sheet comprises residual austenite in an area fraction of 5-25%.3. The high strength galvanized steel sheet of claim 1 , wherein the cold-rolled steel sheet has a tensile strength of 1 claim 1 ,000 MPa or higher claim 1 , and a value of tensile strength (MPa)×elongation (%) is 15 claim 1 ,000 or higher.4. A method for a high strength galvanized steel sheet having excellent surface qualities claim 1 , plating adhesion claim 1 , and formability claim 1 , the ...

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Номер записи: 70
02-01-2020 дата публикации

HOT-ROLLED FERRITIC STAINLESS STEEL SHEET AND METHOD FOR MANUFACTURING SAME

Номер: US20200002779A1
Автор: Fujisawa Mitsuyuki, Yoshino Masataka
Принадлежит: JFE STEEL CORPORATION

Provided is a hot-rolled ferritic stainless steel sheet which has sufficient corrosion resistance and which can prevent the occurrence of cracking when subjected to blanking to be formed into a thick flange, and also provided is a method for manufacturing the hot-rolled ferritic stainless steel sheet. A hot-rolled ferritic stainless steel sheet having a chemical composition containing, in mass %, C: 0.001 to 0.020%, Si: 0.05 to 1.00%, Mn: 0.05 to 1.00%, P: 0.04% or less, S: 0.01% or less, Al: 0.001 to 0.50%, N: 0.001 to 0.020%, Cr: 11.0 to 24.0%, Ni: 0.01 to 2.00%, and Nb: 0.12 to 0.80%, with the balance being Fe and incidental impurities, wherein the hot-rolled ferritic stainless steel sheet has a threshold stress intensity factor Kof 25 MPa·mor more. 1. A hot-rolled ferritic stainless steel sheet having a chemical composition comprising , in mass % ,C: 0.001 to 0.020%,Si: 0.05 to 1.00%,Mn: 0.05 to 1.00%,P: 0.04% or less,S: 0.01% or less,Al: 0.001 to 0.50%,N: 0.001 to 0.020%,Cr: 11.0 to 24.0%,Ni: 0.01 to 2.00%, andNb: 0.12 to 0.80%, with a balance of Fe and incidental impurities,{'sub': 'IC', 'sup': '1/2', 'wherein the hot-rolled ferritic stainless steel sheet has a threshold stress intensity factor Kof 25 MPa·mor more.'}2. A hot-rolled ferritic stainless steel sheet having a chemical composition comprising , in mass % ,C: 0.001 to 0.020%,Si: 0.05 to 1.00%,Mn: 0.05 to 1.00%,P: 0.04% or less,S: 0.01% or less,Al: 0.001 to 0.50%,N: 0.001 to 0.020%,Cr: 13.0 to 24.0%,Ni: 0.01 to 0.60%, andNb: 0.12 to 0.80%, with a balance of Fe and incidental impurities,{'sub': 'IC', 'sup': '1/2', 'wherein the hot-rolled ferritic stainless steel sheet has a threshold stress intensity factor Kof 25 MPa·mor more.'}3. The hot-rolled ferritic stainless steel sheet according to claim 1 , wherein the chemical composition further comprises claim 1 , in mass % claim 1 , one or more selected fromCu: 0.01 to 1.50%,Mo: 0.01 to 2.00%,W: 0.01 to 0.20%, andCo: 0.01 to 0.20%.4. The hot-rolled ferritic ...

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Номер записи: 71
02-01-2020 дата публикации

FERRITIC STAINLESS STEEL SHEET, HOT COIL, AND AUTOMOBILE EXHAUST FLANGE MEMBER

Номер: US20200002793A1
Автор: NISHIMURA Akihiro, TAMURA Shinichi, TERAOKA Shinichi
Принадлежит: NIPPON STEEL CORPORATION

A ferritic stainless steel plate having a sheet thickness t of 5.0 to 12.0 mm, including a chemical composition consisting of, in mass percent, C: 0.001 to 0.010%, Si: 0.01 to 1.0%, Mn: 0.01 to 1.0%, P: 0.04% or less, S: 0.010% or less, Cr: 10.0 to 20.0%, Ni: 0.01 to 1.0%, Ti: 0.10 to 0.30%, V: 0.01 to 0.40%, Al: 0.005 to 0.3%, N: 0.001 to 0.02%, and as necessary, one or more of B, Mo, Cu, Mg, Sn, Sb, Zr, Ta, Nb, Hf, W, Co, Ca, REM, and Ga, with the balance being Fe and unavoidable impurities, wherein in a steel micro-structure, on a cross section parallel to a rolling direction, an area ratio of structures each satisfying: major grain diameter/minor grain diameter being 5.0 or more is 90% or more, and an average minor grain diameter of the structures is 100 μm or less. The ferritic stainless steel is excellent in toughness and suitable for an automobile exhaust flange member and the like. 1. A ferritic stainless steel sheet having a sheet thickness t of 5.0 to 12.0 mm , comprisinga chemical composition consisting of, in mass percent:C: 0.001 to 0.010%;Si: 0.01 to 1.0%;Mn: 0.01 to 1.0%;P: 0.04% or less;S: 0.010% or less;Cr: 10.0 to 20.0%;Ni: 0.01 to 1.0%;Ti: 0.10 to 0.30%;V: 0.01 to 0.40%;Al: 0.005 to 0.3%;N: 0.001 to 0.02%;B: 0 to 0.0030%;Mo: 0 to 2.0%;Cu: 0 to 0.3%;Mg: 0 to 0.0030%;Sn: 0 to 0.1%;Sb: 0 to 0.1%;Zr: 0 to 0.1%;Ta: 0 to 0.1%;Nb: 0 to 0.1%;Hf: 0 to 0.1%;W: 0 to 0.1%;Co: 0 to 0.2%;Ca: 0 to 0.0030%;REM: 0 to 0.05%; andGa: 0 to 0.1%,with the balance being Fe and unavoidable impurities, whereinin a steel micro-structure, on a cross section parallel to a rolling direction, an area ratio of structures each satisfying: major grain diameter/minor grain diameter being 5.0 or more is 90% or more, and an average minor grain diameter of the structures is 100 μm or less.2. A hot coil made of the ferritic stainless steel sheet according to .3. An automobile exhaust flange member made of the ferritic stainless steel sheet according to .4. An automobile exhaust flange ...

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Номер записи: 72
02-01-2020 дата публикации

MULTI-LAYERED ZINC ALLOY PLATED STEEL HAVING EXCELLENT SPOT WELDABILITY AND CORROSION RESISTANCE

Номер: US20200002803A1
Автор: Eom Mun-Jong, HONG Seok-Jun, Jung Yong-Hwa, KIM Goo-Hwa, Kim Tae-Yeob, KO Kyoung-Pil, Kwak Young-Jin, Lee Dong-Yoeul, Nam Kyung-Hoon
Принадлежит:

Provided is a multilayer zinc alloy plated steel material comprising a base steel material and multiple plating layers formed on the base steel material, wherein each of the multiple plating layers includes one of a Zn plating layer, a Mg plating layer, and a Zn—Mg alloy plating layer, and the ratio of the weight of Mg contained in the multiple plating layers to the total weight of the multiple plating layers is from 0.13 to 0.24. 1. A multilayer zinc alloy plated steel material comprising a base steel material and multiple plating layers formed on the base steel material ,wherein the ratio of the weight of Mg contained in the multiple plating layers to the total weight of the multiple plating layers is from 0.13 to 0.24, andeach of the multiple plating layers comprises at least one of a Zn single phase, a Mg single phase, and a Zn—Mg alloy phase, and has a phase structure different from phase structures of adjacent plating layers.2. (canceled)3. The multilayer zinc alloy plated steel material of claim 1 , wherein when a GDS profile is measured at a thicknesswise center portion of each of the multiple plating layers claim 1 , a Mg content deviates within a range of ±5%.4. The multilayer zinc alloy plated steel material of claim 1 , wherein grains of the multiple plating layers have an average diameter within a range of 100 nm or less (excluding 0 nm).5. The multilayer zinc alloy plated steel material of claim 1 , wherein the sum of plating amounts of the multiple plating layers is within a range of 40 g/mor less (excluding 0 g/m).6. (canceled)7. The multilayer zinc alloy plated steel material of claim 1 , wherein when spot welding is performed on the multilayer zinc alloy plated steel material claim 1 , the multiple plating layers are changed to a single alloy layer in a weld zone claim 1 , and the single alloy layer in the weld zone comprises a MgZnalloy phase in an area fraction of 90% or greater (including 100%).8. The multilayer zinc alloy plated steel material ...

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Номер записи: 73
01-01-2015 дата публикации

STEEL SHEET, PLATED STEEL SHEET, AND METHOD FOR PRODUCING THE SAME

Номер: US20150004433A1
Автор: Goto Koichi, Hayashi Kunio, Nakano Kazuaki, Ogawa Toshio, Tanaka Hiroyuki
Принадлежит:

A steel sheet includes, by mass %: C: 0.020% to 0.080%; Si: 0.01% to 0.10%; Mn: 0.80% to 1.80%; and Al: more than 0.10% and less than 0.40%; and further includes: Nb: 0.005% to 0.095%; and Ti: 0.005% to 0.095%, in which a total amount of Nb and Ti is 0.030% to 0.100%, and the steel sheet includes, as a metallographic structure, ferrite, bainite, and other phases, an area fraction of the ferrite is 80% to 95%, an area fraction of the bainite is 5% to 20%, a total fraction of the other phases is less than 3%, a tensile strength is 590 MPa or more, and a fatigue strength ratio as a fatigue strength to the tensile strength is 0.45 or more. 1. A steel sheet comprising , by mass %:C, 0.020% or more and 0.080% or less;Si: 0.01% or more and 0.10% or less;Mn: 0.80% or more and 1.80% or less;Al: more than 0.10% and less than 0.40%;Mo: 0% or more and 1.000% or less;W: 0% or more and 1.000% or less;V: 0% or more and 1.000% or less;B: 0% or more and 0.0100% or less;Ni: 0% or more and 1.50% or less;Cu: 0% or more and 1.50% or less;Cr: 0% or more and 1.50% or less;P: limited to 0.0100% or less;S: limited to 0.0150% or less;N: limited to 0.0100% or less;Nb: 0.005% or more and 0.095% or less;Ti: 0.005% or more and 0.095% or less; anda balance consisting of Fe and unavoidable impurities, whereina total amount of Nb and Ti is 0.030% or more and 0.100% or less,a metallographic structure of the steel sheet includes ferrite, bainite, and other phases,the other phases include a pearlite, a residual austenite, and a martensite,an area fraction of the ferrite is 80% or more and 95% or less,an area fraction of the bainite is 5% or more and 20% or less,a total fraction of the other phases is less than 3%,an equivalent circle diameter of a cementite in the ferrite is 0.003 μm or more and 0.300 μm or less,{'sup': 2', '2, 'a number density of the cementite in the ferrite is 0.02 particles/μmor more and 0.10 particles/μmor less,'}a tensile strength is 590 MPa or more, anda fatigue strength ratio ...

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Номер записи: 74
07-01-2021 дата публикации

COLD ROLLED STEEL SHEET AND A METHOD OF MANUFACTURING THEREOF

Номер: US20210002740A1
Автор: ARLAZAROV Artem, PIPARD Jean-Marc
Принадлежит:

A cold rolled heat treated steel sheet having a composition with the following elements, expressed in percentage by weight 0.1%≤Carbon≤0.5%, 1%≤Manganese≤3.4%, 0.5%≤Silicon≤2.5%, 0.03%≤Aluminum≤1.5%, 0%≤Sulfur≤0.003%, 0.002%≤Phosphorus≤0.02%, 0%≤Nitrogen≤0.01% and can contain one or more of the following optional elements 0.05%≤Chromium≤1%, 0.001%≤Molybdenum≤0.5%, 0.001%≤Niobium≤0.1%, 0.001%≤Titanium≤0.1%, 0.01%≤Copper≤2%, 0.01%≤Nickel≤3%, 0.0001%≤Calcium≤0.005%, 0%≤Vanadium≤0.1%, 0%≤Boron≤0.003%, 0%≤Cerium≤0.1%, 0%≤Magnesium≤0.010%, 0%≤Zirconium≤0.010%, the remainder composition being composed of iron and unavoidable impurities caused by processing, the microstructure of the steel sheet having in area fraction, 10 to 30% Residual Austenite, 50 to 85% Bainite, 1 to 20% Quenched Martensite, and less than 30% Tempered Martensite. 117.-. (canceled)18. A cold rolled heat treated steel sheet having a composition comprising the following elements , expressed in percentage by weight:0.1%≤Carbon≤0.5%1%≤Manganese≤3.4%0.5%≤Silicon≤2.5%0.03%≤Aluminum≤1.5%0%≤Sulfur≤0.003%.0.002%≤Phosphorus≤0.02%0%≤Nitrogen≤0.01%and optionally containing one or more of the following elements0.05%≤Chromium≤1%0.001%≤Molybdenum≤0.5%0.001%≤Niobium≤0.1%0.001%≤Titanium≤0.1%0.01%≤Copper≤2%0.01%≤Nickel≤3%0.0001%≤Calcium≤0.005%0%≤Vanadium≤0.1%0%≤Boron≤0.003%0%≤Cerium 0.1%0%≤Magnesium≤0.010%0%≤Zirconium≤0.010%a remainder being iron and unavoidable impurities caused by processing;a microstructure of the cold rolled heat treated steel sheet comprising in area fraction, 10 to 30% Residual Austenite, 50 to 85% Bainite, 1 to 20% Quenched Martensite, and less than 30% Tempered Martensite.19. The cold rolled heat treated steel as recited in wherein the composition includes 0.7% to 2.4% of Silicon.20. The cold rolled heat treated steel as recited in wherein the composition includes 0.03% to 0.9% of Aluminum.21. The cold rolled heat treated steel as recited in wherein the composition includes 0.03% to 0.6% of ...

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Номер записи: 75
07-01-2021 дата публикации

High-strength steel sheet with excellent ductility and hole-expandability

Номер: US20210002741A1
Автор: Akihiro Uenishi, Koutarou Hayashi, Shohei Yabu
Принадлежит: Nippon Steel Corp

A steel sheet including, in mass %, C: 0.05% or more and 0.30% or less, Si: 0.05% or more and 6.00% or less, Mn: 1.50% or more and 10.00% or less, and the balance: Fe and impurities, a steel sheet structure is composed of, in area ratio, 15% or more and 80% or less of ferrite and 20% or more and 85% or less in total of a hard structure composed of any one of bainite, martensite, or retained austenite, or any combination thereof, and to a steel sheet thickness t, an area ratio of a maximum coupled ferrite region in a region from a t/2 position at the steel sheet thickness center to a position at a depth of 3t/8 from a surface is 80% or more in area ratio to a total ferrite area, and a two-dimensional isoperimetric constant of the maximum coupled ferrite region is 0.35 or less.

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Номер записи: 76
07-01-2021 дата публикации

PRESS HARDENED STEEL WITH SURFACE LAYERED HOMOGENOUS OXIDE AFTER HOT FORMING

Номер: US20210002746A1
Автор: Lu Qi, WANG JIANFENG
Принадлежит: GM GLOBAL TECHNOLOGY OPERATIONS LLC

A press-hardened steel is provided. The press-hardened steel has an alloy matrix including from about 0.01 wt. % to about 0.35 wt. % carbon, from about 1 wt. % to about 9 wt. % chromium, from about 0.5 wt. % to about 2 wt. % silicon, and a balance of iron. The alloy matrix is greater than or equal to about 95 vol. % martensite. A first layer is disposed directly on the alloy matrix. The first layer is continuous, has a thickness of greater than or equal to about 0.01 μm to less than or equal to about 10 μm, and includes an oxide enriched with chromium and silicon. A second layer is disposed directly on the first layer, and includes an oxide enriched with Fe. Methods of preparing the press-hardened steel are also provided. 1. A press-hardened steel comprising: carbon (C) at a concentration of greater than or equal to about 0.01 wt. % to less than or equal to about 0.35 wt. %,', 'chromium (Cr) at a concentration of greater than or equal to about 1 wt. % to less than or equal to about 9 wt. %,', 'silicon (Si) at a concentration of greater than or equal to about 0.5 wt. % to less than or equal to about 2 wt. %, and', 'a balance of iron (Fe),', 'the alloy matrix being greater than or equal to about 95 vol. % martensite;, 'an alloy matrix comprisinga first layer disposed directly on the alloy matrix, the first layer being continuous, having a thickness of greater than or equal to about 0.01 μm to less than or equal to about 10 μm, and comprising an oxide enriched with Cr and Si; anda second layer disposed directly on the first layer, the second layer comprising an oxide enriched with Fe.2. The press-hardened steel according to claim 1 , wherein the alloy matrix further comprises:manganese (Mn) at a concentration of greater than or equal to about 0.01 wt. % to less than or equal to about 3 wt. %,molybdenum (Mo) at a concentration of greater than or equal to about 0.01 wt. % to less than or equal to about 0.8 wt. %,niobium (Nb) at a concentration of greater than or equal to ...

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Номер записи: 77
07-01-2021 дата публикации

COMPONENT FOR CONTACTING HYDROGEN

Номер: US20210002747A1
Автор: Kuntz Matthias
Принадлежит:

A component for contacting hydrogen, including at least one surface, which is provided for coming into contact with a hydrogen atmosphere, at least this surface being made from steel, wherein the steel has a microstructure which includes austenite and ferrite, an austenitic structure fraction being present in a range from greater than or equal to 1 wt. % to less than or equal to 50 wt. %, and a ferritic structure fraction being present in a range from greater than or equal to 50 wt. % to less than or equal to 99 wt. % 110-. (canceled)11. A component for contacting hydrogen , comprising:at least one surface, which is provided for coming into contact with a hydrogen atmosphere, at least this surface being made from steel;wherein the steel has a microstructure which includes austenite and ferrite, an austenitic structure fraction being present in a range of greater than or equal to 1 wt. % to less than or equal to 50 wt. %, and a ferritic structure fraction being present in a range of greater than or equal to 50 wt. % to less than or equal to 99 wt. %12. The component as recited in claim 11 , wherein the austenitic structure fraction is present in a range of greater than or equal to 3 wt. % to less than or equal to 15 wt. % claim 11 , and the ferritic structure fraction is present in a range of greater than or equal to 85 wt. % to less than or equal to 97 wt. %.13. The component as recited in claim 11 , wherein the steel includes silicon in a content of greater than or equal to 0.5 wt. % to less than or equal to 5.0 wt. % claim 11 , and the steel includes carbon in a content of greater than or equal to 0.3 wt. % to less than or equal to 2.0 wt. %.14. The component as recited in claim 13 , wherein the steel is an alloy claim 13 , which includes the following constituents:carbon in a range of greater than or equal to 0.3 wt. % to less than or equal to 2.0 wt. %;silicon in a range of greater than or equal to 0.5 wt. % to less than or equal to 5.0 wt. %;manganese in a ...

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Номер записи: 78
07-01-2021 дата публикации

NEW DUPLEX STAINLESS STEEL

Номер: US20210002750A1
Автор: ANTONSSON Tomas, NYLOF Lars
Принадлежит: Sandvik Intellectual Property AB

The present disclosure relates to a duplex stainless steel comprising in weight % (wt %): C less than 0.03; Si less than 0.60; Mn 0.40 to 2.00; P less than 0.04; S less than or equal to 0.01; Cr more than 30.00 to 33.00; Ni 6.00 to 10.00; Mo 1.30 to 2.90; N 0.15 to 0.28; Cu 0.60 to 2.20; Al less than 0.05; balance Fe and unavoidable impurities. The present disclosure also relates to a component or a construction material comprising the duplex stainless steel. Additionally, the present disclosure also relates to a process for manufacturing a component comprising said duplex stainless steel. 2. The duplex stainless steel according to claim 1 , wherein said duplex stainless steel has a PRE claim 1 , which is greater than or equal to 36 and wherein PRE=wt % Cr+3.3*wt % Mo.3. The duplex stainless steel according to claim 1 , wherein the content of Al is less than 0.03 wt %.4. The duplex stainless steel according to claim 1 , wherein the content of Si is less than 0.30 wt %.5. The duplex stainless steel according to claim 1 , wherein the content of Mn is 0.60-1.80 wt %.6. The duplex stainless steel according to claim 1 , wherein the content of Ni is 6.50-9.50 wt %.7. The duplex stainless steel according to claim 1 , wherein the content of Cu is 1.10-1.90 wt %.8. The duplex stainless steel according to claim 1 , wherein the content of N is 0.17-0.25 wt %.9. The duplex stainless steel according to claim 1 , wherein the content of Cr is 30.50-32.50 wt %.10. The duplex stainless steel according to claim 1 , wherein the content of Mo is 1.35-2.90 wt %.11. A method for manufacturing a component comprising a duplex stainless steel claim 1 , the method comprising the following steps:{'claim-ref': {'@idref': 'CLM-00001', 'claim 1'}, 'providing a melt comprising an alloy composition according to ;'}casting the melt to an object;optionally heat-treating the object;hot working the object to a component;heat-treating the component;optionally cold working the component; andoptionally ...

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Номер записи: 79
07-01-2021 дата публикации

MULTILAYERED ZINC ALLOY PLATED STEEL MATERIAL HAVING EXCELLENT SPOT WELDABILITY AND CORROSION RESISTANCE

Номер: US20210002772A1
Автор: Jung Woo-Sung, Kim Tae-Yeob, Kwak Young-Jin
Принадлежит:

Provided is a multilayered zinc alloy plated steel material comprising a base iron and multilayered plated layers formed on the base iron, wherein each of the multilayered plated layers is any one of a Zn-plated layer, a Mg-plated layer, and a Zn—Mg alloy-plated layer, and the ratio of the weight of Mg contained in the multilayered plated layers is 0.13-0.24 on the basis of the total weight of the multilayered plated layers. 1. A multilayered zinc alloy plated steel material , comprising:a base iron and multilayered plated layers formed on the base iron,wherein one or more of the multilayered plated layers includes a Zn—Mg alloy plated layer, and at least one of the Zn—Mg alloy plated layers includes Mg by greater than 18 weight % and equal to or lower than 35 weight %, andwherein a ratio of a weight of Mg contained in the multilayered plated layers to a total weight of the multilayered plated layers is 0.13-0.24.2. The multilayered zinc alloy plated steel material of claim 1 , wherein a ratio of a weight of Mg contained in the multilayered plated layers to a total weight of the multilayered plated layers is 0.157-0.20.3. The multilayered zinc alloy plated steel material of claim 1 , wherein claim 1 , when a GDS profile is measured at a central portion of each of the multilayered plated layers in a thickness direction claim 1 , a deviation of a content of Mg is within ±5%.4. The multilayered zinc alloy plated steel material of claim 1 , wherein an average grain size of grains forming the multilayered plated layers is 100 nm or less (excluding 0 nm).5. The multilayered zinc alloy plated steel material of claim 1 , wherein a sum of coating amounts of the multilayered plated layers is 40 g/mor less (excluding 0 g/m).6. The multilayered zinc alloy plated steel material of claim 2 , wherein a sum of coating amounts of the multilayered plated layers is 10-35 g/m.7. The multilayered zinc alloy plated steel material of claim 1 ,wherein, when the zinc alloy plated steel ...

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Номер записи: 80
03-01-2019 дата публикации

Low Alloy Steels with Enhanced Toughness and Fatigue Strength at High Hardness

Номер: US20190002998A1
Автор: Cryderman Robert L.
Принадлежит:

Methods of forming low alloy steels and steels produced by such methods are provided. Various alloy additions and elements, as well as heating and tempering times and method steps are provided herein. Methods and materials of the present disclosure provide for enhanced fatigue at high hardness as compared with more brittle conventional steels. 1. A method of forming a steel alloy , comprising:providing a carbon steel with between approximately 0.40 and approximately 0.60 carbon by weight percent;adding at least one of manganese, nickel, molybdenum, and tungsten as an alloy addition wherein the at least one alloy addition comprises not more than approximately 2.2 weight percent of the combined carbon steel and the alloy addition;austenitizing the carbon steel and the at least one alloy addition for between 1500 seconds and 2000 seconds at 900 degrees Celsius and at 1150 degrees Celsius;quenching the carbon steel and the at least one alloy addition in the presence of helium;tempering the carbon steel and the at least one alloy addition at a temperature between approximately 150 degrees Celsius and 250 degrees Celsius;performing a further austenitizing step comprising at least one of induction heating and direct-resistance heating; andquenching and tempering the carbon steel and the at least one alloy addition at between approximately 150 degrees Celsius and 250 degrees Celsius.2. The method of claim 1 , wherein the at least one of induction heating and direct-resistance heating comprises providing the carbon steel and the at least one alloy addition at 850 degrees Celsius for 2 seconds claim 1 , at 950 degrees Celsius for 10 seconds claim 1 , and 1050 degrees Celsius for 1000 seconds.3. The method of claim 1 , wherein the step of quenching and tempering the carbon steel and the at least one alloy addition is performed at a temperature of approximately 200 degrees Celsius.4. The method of claim 1 , wherein at least one of the austenitizing steps is performed with a ...

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Номер записи: 81
03-01-2019 дата публикации

Case hardening steel, carburized component, and manufacturing method of case hardening steel

Номер: US20190002999A1
Автор: Akira Shiga, Hideo Mizukami, Kei Miyanishi, Yutaka Neishi
Принадлежит: Nippon Steel and Sumitomo Metal Corp

A case hardening steel includes, as a chemical composition, by mass %, C: 0.10% to 0.30%, Si: 0.02% to 1.50%, Mn: 0.30% to 1.80%, S: 0.003% to 0.020%, Cr: 0.40% to 2.00%, Al: 0.005% to 0.050%, Ti: 0.06% to 0.20%, Bi: 0.0001% to 0.0050%, Mo: 0% to 1.50%, Ni: 0% to 3.50%, V: 0% to 0.50%, B: 0% to 0.0050%, Nb: 0% or more and less than 0.040%, P: limited to 0.050% or less, N: limited to 0.0060% or less, O: limited to 0.0025% or less, and a remainder including an iron and impurities, and satisfies Ti/S≥6.0, in which, in a longitudinal section, a maximum diameter of Ti-based precipitates predicted by extreme value statistics under a condition that an inspection standard area is 100 mm2, a number of inspections is 16 visual fields, and an area where prediction is performed is 30,000 mm2, is 40 μm or less.

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Номер записи: 82
03-01-2019 дата публикации

Bolt

Номер: US20190003000A1
Автор: Hideo Kanisawa, Kazuoki SHIBUYA, Kazutaka Aoyama, Keisuke Chiba, Makoto Kosaka, Naoki Matsui, Ryoko Inagaki, Tetsushi Chida, Yutaka Neishi
Принадлежит: Aoyama Seisakusho Co Ltd, Nippon Steel and Sumitomo Metal Corp

A bolt is provided that has high strength and excellent hydrogen embrittlement resistance characteristics. A bolt according to an embodiment of the present invention consists of, in mass %, C: 0.32 to 0.39%, Si: 0.15% or less, Mn: 0.40 to 0.65%, P: 0.020% or less, S: 0.020% or less, Cr: 0.85 to 1.25%, Al: 0.005 to 0.060%, Ti: 0.010 to 0.050%, B: 0.0010 to 0.0030%, N: 0.0015 to 0.0080%, 0: 0.0015% or less, Mo: 0 to 0.05%, V: 0 to 0.05%, Cu: 0 to 0.50%, Ni: 0 to 0.30%, and Nb: 0 to 0.05%, with the balance being Fe and impurities. The bolt satisfies Formula (1) and Formula (2), and has a tensile strength of 1000 to 1300 MPa and satisfies Formula (3). 4.9≤10C+Si+2Mn+Cr+4Mo+5V≤6.1   (1) Mn/Cr≤0.55   (2) [dissolved Cr]/Cr≥0.70   (3)

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Номер записи: 83
03-01-2019 дата публикации

ULTRA-HIGH STRENGTH STEEL SHEET HAVING EXCELLENT PHOSPHATABILITY AND BENDABILITY AND METHOD FOR MANUFACTURING SAME

Номер: US20190003002A1
Автор: SEO Seok-Jong
Принадлежит:

Provided is an ultra-high strength steel sheet having excellent phosphatability and bendability. The ultra-high strength steel sheet includes, by weight percentage (wt %), carbon (C): 0.08% to 0.2%, silicon (Si): 0.05% to 1.3%, manganese (Mn): 2.0% to 3.0%, phosphorus (P): 0.001% to 0.10%, sulfur (S): 0.010% or less, aluminum (Al): 0.01% to 0.1%, chromium (Cr): 0.3% to 1.2%, boron (B): 0.0010% to 0.0030%, titanium (Ti): 0.01% to 0.05%, nitrogen (N): 0.001% to 0.01%, a remainder of iron (Fe) and other inevitable impurities, satisfying: 3.4≤Ti/N≤10, 1.0≤Mn/(Si+Cr), and 0.7≤Mn*/(Si*+Cr*)≤Mn/(Si+Cr), where Ti, N, Mn, Si and Cr refer to a weight percentage (wt %), and Mn*, Si* and Cr* refer to an average of values obtained by GDS component analysis from a surface to a 0.1 μm position in a thickness direction. 1. An ultra-high strength steel sheet having excellent phosphatability and bendability , comprising , by weight percentage (wt %) , carbon (C): 0.08% to 0.2% , silicon (Si): 0.05% to 1.3% , manganese (Mn): 2.0% to 3.0% , phosphorus (P): 0.001% to 0.10% , sulfur (S): 0.010% or less , aluminum (Al): 0.01% to 0.1% , chromium (Cr): 0.3% to 1.2% , boron (B): 0.0010% to 0.0030% , titanium (Ti): 0.01% to 0.05% , nitrogen (N): 0.001% to 0.01% , a remainder of iron (Fe) and other inevitable impurities ,wherein Ti and N satisfy Relationship 1,wherein Mn, Si and Cr satisfy Relationship 2, [{'br': None, '3.4≤Ti/N≤10 \u2003\u2003[Relationship 1]'}, {'br': None, '1.0≤Mn/(Si+Cr) \u2003\u2003[Relationship 2]'}, {'br': None, '0.7≤Mn*/(Si*+Cr*)≤Mn/(Si+Cr) \u2003\u2003[Relationship 3]'}], 'wherein amounts of Mn, Si and Cr in a surface layer, ranging from a surface to a 0.1 pm position in a thickness direction, satisfy Relationship 3wherein each of Ti, N, Mn, Si and Cr in Relationships 1 to 3 refers to a weight percentage (wt %) of the element, and each of Mn*, Si* and Cr* in Relationship 3 refers to an average of values obtained by GDS component analysis from a surface to a 0.1 pm ...

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Номер записи: 84
03-01-2019 дата публикации

Vehicle part having high strength and excellent durability, and manufacturing method therefor

Номер: US20190003004A1
Автор: Hwan-Goo Seong, Ki-Hyun Park, Yeol-Rae Cho, Youn-Il CHUNG
Принадлежит: Posco Co Ltd

Provided are a part for vehicle having high strength and excellent durability, and a manufacturing method therefor. The part for vehicle comprises, by a weight ratio, a composition comprising 0.20-0.50% of C, 0.5% or less of Si, 1.0-2.0% of Mn, 0.01-0.1% of Al, 0.010% or less of P, 0.003% or less of S, 0.01-0.1% of Ti, 0.05-0.5% of Cr, 0.05-0.3% of Mo, 0.01% or less of N, and the remainder being Fe and other inevitable impurities, and the part for vehicle can have, by an area ratio, a microstructure comprising 90% or more of tempered martensite, 4% or less of retained austenite, and the remainder being one type or both of two types selected from among the ferrite and bainite structures.

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Номер записи: 85
03-01-2019 дата публикации

Method for Producing a Steel Sheet Having Improved Strength, Ductility and Formability

Номер: US20190003005A1
Автор: JUN Hyun Jo, VENKATASURYA Pavan
Принадлежит:

A method for producing a steel sheet is provided. The steel sheet has a microstructure including, in area fraction, 20% to 50% intercritical ferrite, 10% to 20% retained austenite, 25% to 45% tempered martensite, 10% to 20% fresh martensite, and bainite. The sum of tempered martensite and bainite is between 30% and 60%. The method includes providing a cold-rolled steel sheet including, in weight percent, 0.18%≤C≤0.25%, 0.9%≤Si≤1.8%, 0.02%≤Al≤1.0%, with 1.00%≤Si+Al≤2.35%, 1.5%≤Mn 2.5%, 0.010%≤Nb≤0.035%, 0.10%≤Cr≤0.40%, and a remainder including Fe and unavoidable impurities. The method further includes annealing the steel sheet to obtain 50% to 80% austenite and 20% to 50% of ferrite, quenching the sheet at a cooling rate between 20° C./s and 50° C./s to a quenching temperature between Ms-50° C. and Ms-5° C., heating the sheet to a partitioning temperature between 375° C. and 450° C. and maintaining the sheet at the partitioning temperature for at least 50 s, then immediately cooling the sheet to room temperature. A steel sheet is also provided. 121-. (canceled)23. The method according to claim 22 , wherein the steel sheet has claim 22 , just after quenching a structure consisting of claim 22 , in area fraction claim 22 , at least 20% austenite claim 22 , between 30% and 60% martensite claim 22 , and between 20% and 50% ferrite.24. The method according to claim 22 , wherein the chemical composition of the steel includes 1.25%≤Si+Al≤2.35%.25. The method according to claim 22 , further comprising a step of:hot dip coating the steel sheet between the step of maintaining the steel sheet at the partitioning temperature PT and the step of cooling the steel sheet down to the room temperature.26. The method according to claim 25 , wherein the partitioning temperature PT is between 400° C. and 430° C.27. The method according to claim 25 , wherein the partitioning time Pt is between 50 s and 150 s.28. The method according to claim 25 , wherein the hot dip coating step is a ...

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Номер записи: 86
03-01-2019 дата публикации

Mn-CONTAINING GALVANNEALED STEEL SHEET AND METHOD FOR PRODUCING THE SAME

Номер: US20190003006A1
Автор: Kawasaki Yoshiyasu, Maeda Satoshi, Makimizu Yoichi, Suzuki Yoshitsugu, Yamada Katsumi
Принадлежит: JFE STEEL CORPORATION

High-strength galvannealed steel sheet including any of a) an oxide containing Fe and Mn, b) an oxide containing Fe and Mn and an Fe oxide, c) an oxide containing Fe and Mn and a Mn oxide, d) an oxide containing Fe and Mn, an Fe oxide, and a Mn oxide, and e) an Fe oxide and a Mn oxide is present in a zinc coated layer. The total amount of oxide is 0.01 to 0.100 g/m; the ratio by mass % of Mn to Fe, e.g., Mn/Fe, contained in the oxide is 0.10 to 10.00; an oxide of at least one selected from Fe and Mn is present in an amount of 60% or more; and an oxide of at least one selected from Fe and Mn is present in a surface layer portion of a steel sheet in an amount of 0.040 g/mor less (not including zero). 1. A Mn-containing galvannealed steel sheet , comprising a steel sheet containing , on a mass % basis:C: 0.03% to 0.35%;Si: 0.01% to 2.00%;Mn: 3.0% to 8.0%;Al: 0.001% to 1.000%;P: 0.10% or less; and{'sup': '2', 'claim-text': 'wherein the zinc coated layer contains any one of a) to e) described below,', 'S: 0.01% or less, the balance being Fe and incidental impurities, the steel sheet having a zinc coated layer on one or both surfaces thereof with a coating weight of 20 to 120 g/m,'}a) an oxide containing Fe and Mn,b) an oxide containing Fe and Mn and an Fe oxide,c) an oxide containing Fe and Mn and a Mn oxide,d) an oxide containing Fe and Mn, an Fe oxide, and a Mn oxide, and [{'sup': '2', 'a total amount of the oxide is 0.01 to 0.100 g/min terms of an amount of O, a ratio by mass % of Mn to Fe, i.e., Mn/Fe, contained in the oxide is 0.10 to 10.00,'}, 'the oxide of at least one selected from Fe and Mn is present in an amount of 60% or more in terms of a cross-sectional area fraction in a range from a surface of the zinc coated layer to a position 50% or less of a total thickness of the zinc coated layer, and', {'sup': '2', 'an oxide of at least one selected from Fe and Mn is present in a surface layer portion of the steel sheet in an amount of 0.040 g/mor less (not ...

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Номер записи: 87
03-01-2019 дата публикации

Method for Producing a High Strength Steel Sheet Having Improved Strength and Formability, and Obtained High Strength Steel Sheet

Номер: US20190003007A1
Автор: JUN Hyun Jo, VENKATASURYA Pavan
Принадлежит:

A method for producing a steel sheet having a microstructure including 71% to 91% martensite and bainite, 9% to 13% retained austenite, and at most 20% ferrite is provided. The method includes providing a cold-rolled steel sheet including, in weight percent: 0.13%≤C≤0.22%, 1.2%≤Si≤2.3%, 0.02%≤Al≤1.0%, with 1.25%≤Si+Al≤2.35%, 2.4%≤Mn≤3%, Ti≤0.05%, Nb≤0.05% and a remainder of Fe and unavoidable impurities, annealing the steel sheet to obtain 80% to 100% austenite and 0% to 20% ferrite, quenching the steel sheet at a cooling rate between 20° C./s and 50° C./s to a quenching temperature between 240° C. and 310° C., heating the steel sheet to a partitioning temperature between 400° C. and 465° C. and maintaining the steel sheet at the partitioning temperature for 50 to 250 seconds, then immediately cooling the sheet to room temperature. Steel sheets are also provided. 117to . (canceled)18. A method for producing a steel sheet having a microstructure consisting of between 71% and 91% of a sum of martensite and bainite , between 9% and 13% retained austenite , and at most 20% ferrite , the method comprising the following successive steps: 0.13%≤C≤0.22%,', '1.2%≤Si≤2.3%,', '0.02%≤Al≤1.0%,', 'with 1.25%≤Si+Al≤2.35%,', '2.4%≤Mn≤3%,', 'Ti≤0.05%', 'Nb≤0.05%, and, 'providing a cold-rolled steel sheet, made of a steel having a chemical composition containing by weighta remainder, the remainder including Fe and unavoidable impurities;{'sub': 'A', 'annealing the steel sheet at an annealing temperature Tso as to obtain a structure comprising from 80% to 100% austenite and from 0% to 20% ferrite;'}quenching the steel sheet at a cooling rate between 20° C./s and 50° C./s down to a quenching temperature QT between 240° C. and 270° C.;heating the steel sheet up to a partitioning temperature PT between 440° C. and 460° ;maintaining the steel sheet at the partitioning temperature PT for a partitioning time Pt between 50 s and 250 s; andimmediately after the maintaining step, cooling the ...

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Номер записи: 88
03-01-2019 дата публикации

Method For Producing a High Strength Steel Sheet Having Improved Ductility and Formability, and Obtained Steel Sheet

Номер: US20190003008A1
Автор: GOSPODINOVA Maya, Hebert Veronique, VENKATASURYA Pavan
Принадлежит: ArcelorMittal

A method for producing a steel sheet is provided. The method includes providing a cold-rolled steel sheet including in weight %: 0.15%≤C≤0.23%, 1.4%≤Mn≤2.6%, 0.6%≤Si≤1.5%, 0.02%≤Al≤1.0%, with 1.0%≤Si+Al≤2.0%, 0≤Nb≤0.035%, 0≤Mo≤0.3%, 0≤Cr≤0.3%, and a remainder of Fe and unavoidable impurities, annealing the steel sheet at an annealing temperature between Ac1 and Ac3 to obtaining at least 40% austenite and at least 40% intercritical ferrite, quenching the sheet from at least 600° C. at a cooling rate of at least 20° C./s to a quenching temperature between 180° C. and 260° C., heating the sheet to a partitioning temperature between 375° C. and 470° C. and maintaining the sheet at this partitioning temperature for a partitioning time Pt between 25 s and 440 s, then cooling the sheet to room temperature. A steel sheet is also provided. 133-. (canceled)34. A method for producing a steel sheet having a tensile strength of at least 980 MPa , a total elongation of at least 16% , and a hole expansion ratio HER of at least 20% ,the method for producing the steel sheet comprising the successive steps of: 0.15%≤C≤0.23%,', '1.4%≤Mn≤2.6%,', '0.6%≤Si≤1.5%,', '0.02%≤Al≤1.0%,', 'with 1.0%≤Si+Al≤2.0%,', '0≤Nb≤0.035%,', '0≤Mo≤0.3%,', '0≤Cr≤0.3%,', 'Ni<0.05%,', 'Cu<0.03%,', 'V<0.007%,', 'B<0.0010%,', 'S<0.005%,', 'P<0.02%,', 'N<0.010%, and, 'providing a cold-rolled steel sheet, made of a steel having a chemical composition including by weighta remainder, the remainder including Fe and unavoidable impurities;annealing the steel sheet at an annealing temperature TA between Ac1 and Ac3 to obtain a structure including at least 40% austenite and at least 40% intercritical ferrite;quenching the steel sheet from a temperature of at least 600° C., at a cooling rate of at least 20° C./s, down to a quenching temperature QT between 180° C. and 260° C.;heating the steel sheet up to a partitioning temperature PT between 375° C. and 470° C.;maintaining the steel sheet at the partitioning temperature ...

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Номер записи: 89
03-01-2019 дата публикации

High-strength steel sheet and high-strength galvanized steel sheet

Номер: US20190003009A1
Автор: Hiroyuki Kawata, Kohei Ueda, Naoki Maruyama, Satoshi Uchida, Takayuki Kitazawa, Yuji Yamaguchi
Принадлежит: Nippon Steel and Sumitomo Metal Corp

A high-strength steel sheet includes: a specific chemical composition; and a microstructure represented by, in a ⅛ thickness to ⅜ thickness range with ¼ thickness of a sheet thickness from a surface being a center, in volume fraction, ferrite: 85% or less, bainite: 3% or more and 95% or less, tempered martensite: 1% or more and 80% or less, retained austenite: 1% or more and 25% or less, pearlite and coarse cementite: 5% or less in total, and fresh martensite: 5% or less, in which the solid-solution carbon content in the retained austenite is 0.70 to 1.30 mass %, and to all grain boundaries of retained austenite grains having an aspect ratio of 2.50 or less and a circle-equivalent diameter of 0.80 μm or more, the proportion of interfaces with the tempered martensite or the fresh martensite is 75% or less.

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Номер записи: 90
03-01-2019 дата публикации

HOT WORK TOOL STEEL

Номер: US20190003021A1
Автор: Andersson Jerker, EJNERMARK Sebastian, Medvedeva Anna, Nilsson Cherin, ROBERTSSON Rikard
Принадлежит:

The invention relates hot work tool steel. The steel comprises the following main components (in wt. %): 5. A steel according claim 1 , wherein the content of primary precipitated MX is 0.2-3 vol. % claim 1 , preferably 0.3-1.0 vol. %.8. A steel according to claim 1 , wherein the matrix comprises tempered martensite and/or bainite and the amount of retained austenite is limited to 6 vol. %.9. A steel according to claim 1 , wherein the steel is provided in the form of a powder claim 1 , preferably having a size distribution in the range of 5-150 μm claim 1 , wherein the mean size of the powder particles is in the range of 25-50 μm.10. Use of a steel powder according to for additive manufacturing claim 9 , in particular for making of repairing injection moulding tools.11. A steel according to claim 1 , wherein the matrix comprises tempered martensite and/or bainite and the amount of retained austenite is limited to 5 vol. %.12. A steel according to claim 1 , wherein the matrix comprises tempered martensite and/or bainite and the amount of retained austenite is limited to 4 vol. %.13. A steel according to claim 1 , wherein the matrix comprises tempered martensite and/or bainite and the amount of retained austenite is limited to 2 vol. %.14. A steel according to claim 1 , wherein the steel is provided in the form of a powder claim 1 , having a size distribution in the range of 10-100 μm claim 1 , wherein the mean size of the powder particles is in the range of 25-50 μm.15. A steel according to claim 1 , wherein the steel is provided in the form of a powder claim 1 , having a size distribution in the range of 10-60 μm claim 1 , wherein the mean size of the powder particles is in the range of 25-50 μm. The invention relates to a hot work tool steel.Vanadium alloyed matrix tool steels have been on market for decades and attained a considerable interest because of the fact that they combine a high wear resistance with an excellent dimensional stability and because they have ...

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Номер записи: 91
13-01-2022 дата публикации

HIGH-YIELD-RATIO COLD-ROLLED DUAL-PHASE STEEL AND MANUFACTURING METHOD THERFOR

Номер: US20220010394A1
Автор: Li Wei, XUE Peng, Zhu Xiaodong
Принадлежит: BAOSHAN IRON & STEEL CO., LTD.

Disclosed is a high-yield-ratio cold-rolled dual-phase steel, having the following chemical elements in percentage by mass: 0.05%-0.08% of C, 0.9%-1.2% of Mn, 0.1%-0.6% of Si, 0.030%4060% of Nb, 0.030%-0.060% of Ti, 0.015%-0.045% of Al, and the balance being Fe and other inevitable impurities. A manufacturing method for the high-yield-ratio cold-rolled dual-phase steel, comprising: (1) smelting and casting; (2) hot rolling, wherein a casting blank is controlled and soaked at a temperature of 1200° C.-1250° C.; rolled with the finish rolling temperature being 840° C.-930° C.; cooled at a speed of 20° C./s-70° C./s, and then wound at the winding temperature being 570° C.-630° C.; (3) cold rolling; (4) annealing at the soaking temperature being 750° C.-790° C. for 40 s-200 s, cooling at a speed of 30° C./s-80° C./s, the start temperature of cooling is 650° C. to 730° C., the aging temperature is 200° C. to 260° C., and the overaging time is 100 s to 400 s; and (5) leveling. 1. A cold-rolled dual-phase steel having a high yield ratio , comprising the following chemical elements in mass percentages:C: 0.05-0.08%, Mn: 0.9-1.2%, Si: 0.1-0.6%, Nb: 0.030-0.060%, Ti: 0.030-0.060%, Al: 0.015-0.045%, and a balance of Fe and other unavoidable impurities.2. The cold-rolled dual-phase steel having a high yield ratio according to claim 1 , wherein the steel has a microstructure which is a complex phase structure of martensite+ferrite+[NbxTiy(C claim 1 ,N)z] carbonitride.3. The cold-rolled dual-phase steel having a high yield ratio according to claim 2 , wherein the martensite has a phase proportion of 20-30% claim 2 , and the martensite is in the shape of long strips-islands.4. The cold-rolled dual-phase steel having a high yield ratio according to claim 2 , wherein the [NbxTiy(C claim 2 ,N)z] carbonitride has an irregular spherical shape and is uniformly distributed in ferrite grains claim 2 , and the [NbxTiy(C claim 2 ,N)z] carbonitride has a phase proportion of 5-10%.5. The cold ...

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Номер записи: 92
13-01-2022 дата публикации

Roughly-shaped steel material for nitrided part, and nitrided part

Номер: US20220010416A1
Автор: Hiroaki Tahira, Kison NISHIHARA, Masato Yuya, Satoru Okawa
Принадлежит: Nippon Steel Corp

Provided are a roughly-shaped steel material for a nitrided part, and a nitrided part obtained by nitriding the roughly-shaped steel material for a nitrided part, having a determined chemical composition, in which the portion with a diameter or width ranging from 60 to 130 mm of the roughly-shaped steel material for a nitrided part has a microstructure at a depth of 14.5 mm from a surface including, in terms of area fraction: tempered martensite and tempered bainite in total: from 70 to 100%; remaining austenite: from 0 to 5%; and a balance: ferrite and perlite; and has a microstructure at a depth of 15 mm or more from the surface including, in terms of area fraction: tempered martensite and tempered bainite in total: from 0 to less than 50%; remaining austenite: from 0 to 5%; and a balance: ferrite and perlite.

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Номер записи: 93
13-01-2022 дата публикации

Ferritic stainless steel having improved corrosion resistance, and manufacturing method therefor

Номер: US20220010451A1
Автор: Dong-Hoon Kim, Kkoch Nim OH, Kwang Min Kim
Принадлежит: Posco Co Ltd

Disclosed is a ferritic stainless steel with improved corrosion resistance. The ferritic stainless steel with improved corrosion resistance according to an embodiment of the present disclosure includes, in percent (%) by weight of the entire composition, C: 0.02% or less (excluding 0), N: 0.02% or less (excluding 0), Si: 0.5% or less (excluding 0), Mn: 0.3% or less (excluding 0), Cr: 16 to 20%, Ni: 0.4% or less (excluding 0), the remainder of iron (Fe) and other inevitable impurities, and a Cr weight % content of a thickness region from a surface of a passivation film to 3 nm is 1.2 times or more than the Cr weight % content of the stainless base material.

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Номер записи: 94
08-01-2015 дата публикации

Method for manufacturing ferrous material

Номер: US20150007912A1
Автор: Hidetoshi Fujii, Yoshiaki Morisada
Принадлежит: Osaka University NUC

A base material of a ferrous material is heated to an A C1 point, which is a temperature to cause mustenite appearance, or higher, and austenite appears in the base material 1 a and 1 b (S 101 ). An amount of a strain assuming that an M f point, which is a temperature where the base material becomes martensite completely, is decreased to be less than room temperature is introduced into the base material (S 102 ). The all ferrous material becoming martensite on the occasion of cooling the ferrous material to room temperature is prevented. The base material is cooled to room temperature at a cooling rate where a line extrapolated a cooling curve of the base material intersects with a region where martensite is produced on the CCT diagram (S 103 ). Austenite remains in the manufactured ferrous material at room temperature.

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Номер записи: 95
08-01-2015 дата публикации

Manufacturing Method for Strip Casting 550 MPa-Grade High Strength Atmospheric Corrosion-Resistant Steel Strip

Номер: US20150007913A1
Автор: Fang Yuan, QIN Bo, Wang Xiufang, Wu Jianchun, Yu Yan
Принадлежит:

A manufacturing method for strip casting 550 MPa-grade high strength atmospheric corrosion-resistant steel strip, comprising the following steps: 1) smelting, where the chemical composition of a molten steel is that: C is between 0.03-0.08%, Si≦0.4%, Mn is between 0.6-1.5%, P is between 0.07-0.22%, S≦0.01%, N≦0.012%, Cu is between 0.25-0.8%, Cr is between 0.3-0.8%, and Ni is between 0.12-0.4%, additionally, also comprised is at least one micro-alloying element among Nb, V, Ti, and Mo, where Nb is between 0.01-0.08%, V is between 0.01-0.08%, Ti is between 0.01-0.08%, and Mo is between 0.1-0.4%, and where the remainder is Fe and unavoidable impurities; 2) strip casting, where a 1-5 mm-thick cast strip is casted directly; 3) cooling the strip, where the cooling rate is greater than 20° C./s; 4) online hot rolling the cast strip, where the hot rolling temperature is between 1050-1250° C., where the reduction rate is between 20-50%, and where the deformation rate is >20s; austenite online recrystallizing after hot rolling, where the thickness of the hot rolled strip is between 0.5-3.0 mm; and, 5) cooling and winding, where the cooling rate is between 10-80° C./s, and where the winding temperature is between 570-720° C. The microscopic structure of a steel strip acquired is primarily constituted by fine polygonal ferrite and pearlite. 2. The manufacturing method of claim 1 , wherein claim 1 , in step 1) claim 1 , the content of each of Nb claim 1 , V and Ti is 0.01˜0.05% by weight percentage claim 1 , and the content of Mo is 0.1˜0.25% by weight percentage.3. The manufacturing method of claim 1 , wherein claim 1 , in step 3) claim 1 , the cooling rate of the steel strip is greater than 30°/sec.4. The manufacturing method of claim 1 , wherein claim 1 , in step 4) claim 1 , the hot rolling temperature is in the range of 1 claim 1 ,100˜1 claim 1 ,250°.5. The manufacturing method of claim 1 , wherein claim 1 , in step 4) claim 1 , the hot rolling temperature is in the range ...

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Номер записи: 96
20-01-2022 дата публикации

COLD ROLLED AND HEAT-TREATED STEEL SHEET AND METHOD OF MANUFACTURING THE SAME

Номер: US20220017985A1
Автор: ALEXANDRE Patrice, BOUZAT Magali, CHAKRABORTY Anirban, GHASSEMI-ARMAKI Hassan, GIRINA Olga, JACOLOT Ronan, KOLTSOV Alexey, NADLER Aude, PANAHI Damon, SOLER Michel
Принадлежит:

A cold rolled and heat-treated steel sheet having a composition including, by weight percent: C 0.3-0.4%, Mn 2.0-2.6%, Si: 0.8-1.6%, Al 0.01-0.6%, Mo 0.15-0.5%, Cr 0.3-1.0%, Nb≤0.06%, Ti≤0.06%, Ni≤0.8%, S≤0.010%, P≤0.020% and N≤0.008%, the remainder of the composition being iron and unavoidable impurities resulting from the smelting, and having a microstructure consisting of, in surface fraction: between 15% and 30% of retained austenite, said retained austenite having a carbon content of at least 0.7%, between 70% and 85% of tempered martensite, at most 5% of fresh martensite and at most 5% of bainite. It also deals with a manufacturing method thereof. 117-. (canceled)18. A cold-rolled and heat-treated steel sheet , made of a steel having a composition comprising , by weight percent:C: 0.3-0.4%Mn: 2.0-2.6%Si: 0.8-1.6%Al: 0.01-0.6%Mo: 0.15-0.5%Cr: 0.3-1.0%Nb≤0.06%Ti≤0.06%Ni≤0.8%S≤0.010%P≤0.020%N≤0.008%Cu≤0.03%and optionally one or more of the following elements, in weight percentage:B: 0.0003-0.005%V≤0.2%a remainder of the composition being iron and unavoidable impurities resulting from processing,the steel sheet having a microstructure consisting of, in surface fraction:between 15% and 30% of retained austenite, said retained austenite having a carbon content of at least 0.7%;between 70% and 85% of tempered martensite;at most 5% of fresh martensite; andat most 5% of bainite.19. The cold-rolled and heat-treated steel sheet as recited in wherein the chromium content is between 0.6% and 0.8%.20. The cold-rolled and heat-treated steel sheet as recited in wherein the silicon content is below 1.5%.21. The cold-rolled and heat-treated steel sheet as recited in wherein the silicon content is below 1.4%.22. The cold-rolled and heat-treated steel sheet as recited in wherein the silicon content is below 1.3%.23. The cold-rolled and heat-treated steel sheet as recited in wherein the cumulated amount of silicon and aluminum is equal to or above 1.6%.24. The cold-rolled and heat ...

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Номер записи: 97
12-01-2017 дата публикации

GRINDING MEDIA FABRICATION

Номер: US20170008004A1
Автор: Bahri Amir Hossein, Bovell Michael Laurence, Shelley Paul William
Принадлежит:

A steel ball for use as grinding media in a mill, and a method of fabricating such ball are disclosed. The steel ball has the following composition, by weight 1. A steel for use in fabricating steel balls for use as grinding media in a mill , said steel comprising:a Carbon content of approximately 1.05% by weight,a Silicon content of approximately 0.55% by weight,a Manganese content of approximately 0.75% by weight,a Chromium content of approximately 0.90% by weight,a Molybdenum content of approximately 0.20% by weight,and all other elements other than iron are present at a concentration of less than 0.5% by weight, andthe balance being iron.2. The steel as claimed in wherein:said Carbon content is 1.05%±0.05 by weight,said Silicon content is 0.55%±0.45 by weight,said Manganese content is 0.75%±0.60 by weight,said Chromium content is 0.90%±0.60 by weight, andsaid Molybdenum content is 0.20%±0.20 by weight.3. The steel as claimed in wherein said elements other than iron are selected from the class consisting of Phosphorus claim 1 , Sulphur claim 1 , Nickel claim 1 , Copper claim 1 , Vanadium and Aluminium.4. The steel as claimed in wherein:said Phosphorus content is 0.015%±0.015 by weight,said Sulphur content is 0.015%±0.015 by weight,said Nickel content is 0.225%±0.225 by weight,said Copper content is 0.225%±0.225 by weight,said Vanadium content of approximately 0.05%±0.05 by weight, andsaid Aluminium content is approximately 0.05%±0.05 by weight.5. A method of fabricating steel balls for use as grinding media in a mill claim 4 , said method comprising the steps of:heating an elongate steel billet,forging said billet to form a substantially spherical ball, andquenching said ball,wherein said steel comprisesa Carbon content of approximately 1.05% by weight,a Silicon content of approximately 0.55% by weight,a Manganese content of approximately 0.75% by weight,a Chromium content of approximately 0.90% by weight,a Molybdenum content of approximately 0.20% by weight,and ...

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Номер записи: 98
12-01-2017 дата публикации

STAINLESS STEEL FOIL AND METHOD OF PRODUCTION OF SAME

Номер: US20170009312A1
Автор: Fujimoto Naoki, INAGUMA Toru, Nagasaki Shuji, Nose Koichi, SAWAKI Naoya, Terashima Shinichi, UNNO Hiroto
Принадлежит: Nippon Steel & Sumikin Materials Co., Ltd.

The present invention has as its object to provide thickness 60 μm or less ultra-thin stainless steel foil which secures high thickness precision and simultaneously secures plastic deformability and good elongation at break, that is, secures good press-formability (deep drawability). The present invention solves this problem by ultra-thin stainless steel foil which has three or more crystal grains in a thickness direction, has a recrystallization rate of 90% to 100%, and has a nitrogen concentration of a surface layer of 1.0 mass % or less. For this reason, there is provided a method of production of stainless steel foil comprising rolling stainless steel sheet, then performing final annealing and making a thickness 5 μm to 60 μm, wherein a rolling reduction ratio at rolling right before final annealing is 30% or more, a temperature of final annealing after rolling is 950° C. to 1050° C. in the case of austenitic stainless steel and 850° C. to 950° C. in the case of ferritic stainless steel, and a nitrogen content in atmospheric gas in final annealing is 0.1 vol % or less, whereby ultra-thin stainless steel foil can be produced. 1. Stainless steel foil with a thickness of 5 μm to 60 μm , which has three or more crystal grains in a thickness direction , has a recrystallization rate of 90% to 100% , and has a nitrogen concentration of a surface layer of 1.0 mass % or less.2. Stainless steel foil according to claim 1 , where said thickness is 5 μm to 40 μm.3. Stainless steel foil according to claim 1 , wherein a surface roughness Rz is 100 nm or more and 1/10 or less of the thickness.4. Stainless steel foil according to claim 1 , wherein an elongation at break is 10% or more.5. Stainless steel foil according to claim 1 , wherein said stainless steel foil is ferritic stainless steel.6. Stainless steel foil according to claim 1 , wherein said stainless steel foil is austenitic stainless steel.7. Ultra-thin stainless steel foil according to claim 1 , wherein at least one ...

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Номер записи: 99
12-01-2017 дата публикации

HIGH-STRENGTH HOT-DIP GALVANNEALED STEEL SHEET HAVING EXCELLENT BAKE HARDENING PROPERTY AND BENDABILITY

Номер: US20170009315A1
Автор: IKEDA Muneaki, Murakami Toshio, NAKAYA Michiharu, SHIBATA Kosuke
Принадлежит: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)

The present disclosure relates to a high-strength hot-dip galvannealed steel sheet excellent in bake hardenability and bendability and having a component composition containing, in mass %, C: from 0.05 to 030%, Si: from 0.5 to 3.0%, Mn: from 0.2 to 3.0%, P: from 0 to 0.10%, S: from 0 to 0.010%, N: form 0 to 0.010%, and Al: from 0.001 to 0.10%, with the remainder being iron and unavoidable impurities. The steel sheet has a steel structure containing, in terms of area percentage, martensite: form 50 to 85% and ferrite: 0% or more and less than 5%, with the remainder being bainite. The steel sheet has a dislocation density of 5.0×10mor more, a solute carbon amount of 0.08 mass % or more and a tensile strength of 1180 MPa or more. 2. The high-strength hot-dip galvannealed steel sheet excellent in bake hardenability and bendability according to claim 1 , wherein the component composition further comprises claim 1 , in mass % claim 1 , one or two of:Cu: from 0.05 to 1.0%,Ni: from 0.05 to 1.0%, andB: from 0.0002 to 0.0050%.3. The high-strength hot-dip galvannealed steel sheet excellent in bake hardenability and bendability according to claim 1 , wherein the component composition further comprises claim 1 , in mass % claim 1 , one or two of:Mo: from 0.01 to 1.0%,Cr: from 0.01 to 1.0%,Nb: from 0.01 to 0.3%.Ti: from 0.01 to 0.3%, andV: from 0.01 to 0.3%.4. The high-strength hot-dip galvannealed steel sheet excellent in bake hardenability and bendability according to claim 2 , wherein the component composition further comprises claim 2 , in mass % claim 2 , one or two of:Mo: from 0.01 to 1.0%,Cr: from 0.01 to 1.0%.Nb: from 0.01 to 0.3%,Ti: from 0.01 to 0.3%, andV: from 0.01 to 0.3%.5. The high-strength hot-dip galvannealed steel sheet excellent in bake hardenability and bendability according to claim 1 , wherein the component composition further comprises claim 1 , in mass % claim 1 , one or two of:Ca: from 0.0005 to 0.01% andMg: from 0.0005 to 0.01%.6. The high-strength hot- ...

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Номер записи: 100