公开(公告)号：US10900104B2

公开(公告)日：2021-01-26

申请号：US16027803

申请日：2018-07-05

Applicant: JFE STEEL CORPORATION

Inventor： Chikara Kami ,  Sota Goto

IPC: C21D9/46 ,  C22C38/00 ,  C21D8/02 ,  C21D6/00 ,  C22C38/58 ,  C21D8/12 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54

Abstract: A method for manufacturing a hot rolled steel sheet having a low yield ratio and that is excellent in low-temperature toughness, the steel sheet having a specified chemical composition. The method comprises hot rolling a steel material into a steel sheet, cooling the steel material using a cooling process comprising a first cooling and a second cooling, and performing a coiling process on the steel sheet in such a manner that the coiling temperature is 450° C. or more in terms of surface temperature of the steel sheet.

公开(公告)号：US10655195B2

公开(公告)日：2020-05-19

申请号：US15565998

申请日：2016-04-15

Applicant: JFE STEEL CORPORATION

Inventor： Tetsuyuki Nakamura ,  Takashi Samukawa ,  Mitsuyuki Fujisawa ,  Chikara Kami

IPC: C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/52 ,  C22C38/54 ,  C22C38/40 ,  C22C38/04 ,  C22C38/58 ,  C21D9/46 ,  C21D6/00 ,  C21D1/18 ,  C22C38/42 ,  C21D1/25 ,  C21D8/04 ,  C21D9/00

Abstract: The disclosure is to provide a martensitic stainless steel excellent in strength, workability and corrosion resistance. The martensitic stainless steel comprises a chemical composition containing, in mass %: C: 0.020% or more and less than 0.10%, Si: 0.01% or more and 2.0% or less, Mn: 0.01% or more and 3.0% or less, P: 0.050% or less, S: 0.050% or less, Cr: 10.0% or more and 16.0% or less, Ni: 0.01% or more and 0.80% or less, Al: 0.001% or more and 0.50% or less, and N: more than 0.050% and 0.20% or less, satisfying N % C %, and the balance containing Fe and incidental impurities, where C % and N % indicate respectively the contents of C and N (mass %) in the steel.

公开(公告)号：US10047416B2

公开(公告)日：2018-08-14

申请号：US14427822

申请日：2013-09-11

Applicant: JFE STEEL CORPORATION

Inventor： Chikara Kami ,  Sota Goto

IPC: C22C38/04 ,  C21D6/00 ,  C22C38/00 ,  C21D8/02 ,  C21D9/46 ,  C22C38/58 ,  C21D8/12 ,  C22C38/02 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54

Abstract: A high strength hot rolled steel sheet is provided with low yield ratio and that is excellent in low-temperature toughness. The hot rolled steel sheet can be used as a raw material of a steel pipe. The steel sheet has a chemical composition containing C: 0.03% or more and 0.10% or less, Si: 0.01% or more and 0.50% or less, Mn: 1.4% or more and 2.2% or less, P: 0.025% or less, S: 0.005% or less, Al: 0.005% or more and 0.10% or less, Nb: 0.02% or more and 0.10% or less, Ti: 0.001% or more and 0.030% or less, Mo: 0.01% or more and 0.50% or less, Cr: 0.01% or more and 0.50% or less, and Ni: 0.01% or more and 0.50% or less, in which the condition that Moeq is 1.4% or more and 2.2% or less.

公开(公告)号：US20170088912A1

公开(公告)日：2017-03-30

申请号：US15126827

申请日：2015-02-25

Applicant: JFE STEEL CORPORATION

Inventor： Kunio Fukuda ,  Mitsuyuki Fujisawa ,  Akito Mizutani ,  Tomohiro Ishii ,  Chikara Kami

IPC: C21D9/46 ,  C21D6/00 ,  C21D1/06 ,  C21D1/74 ,  C22C38/54 ,  C22C38/50 ,  C22C38/48 ,  C22C38/46 ,  C22C38/44 ,  C22C38/42 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C23C8/02 ,  C23C8/26 ,  C23C8/80 ,  C21D8/00

CPC classification number: C21D9/46 ,  C21D1/06 ,  C21D1/74 ,  C21D6/002 ,  C21D6/004 ,  C21D8/005 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/004 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C23C8/02 ,  C23C8/26 ,  C23C8/80 ,  C23G1/00 ,  C23G1/081 ,  C23G1/086

Abstract: Provided is a ferritic stainless steel that has excellent corrosion resistance and displays good brazing properties when brazing is carried out at high temperature using a Ni-containing brazing metal. These effects are obtained as a result of the steel having a chemical composition containing, in mass %: 0.003% to 0.020% of C; 0.05% to 1.00% of Si; 0.10% to 0.50% of Mn, 0.05% or less of P; 0.01% or less of S; 16.0% to 25.0% of Cr; 0.05% to 0.35% of Ti; 0.005% to 0.05% of Al; and 0.005% to 0.025% of N, the balance being Fe and incidental impurities, and as a result of a nitrogen-enriched layer being created that has a nitrogen concentration peak value of 0.05 mass % to 0.30 mass % at a depth of within 0.05 μm of a surface of the steel.

公开(公告)号：US20150368741A1

公开(公告)日：2015-12-24

申请号：US14764818

申请日：2014-01-23

Applicant: JFE STEEL CORPORATION

Inventor： Katsumi Nakajima ,  Kazuhiko Yamazaki ,  Chikara Kami

IPC: C21D9/46 ,  C22C38/28 ,  C22C38/24 ,  C22C38/16 ,  C22C38/14 ,  C22C38/12 ,  C22C38/08 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C23C2/06 ,  C23C2/28 ,  C23C2/40 ,  C21D8/02

CPC classification number: C21D9/46 ,  C21D8/0226 ,  C21D2211/004 ,  C21D2211/005 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/24 ,  C22C38/28 ,  C22C38/54 ,  C23C2/02 ,  C23C2/06 ,  C23C2/28 ,  C23C2/40 ,  Y02P10/212

Abstract: There are provided a high-strength hot-rolled steel sheet having high burring formability and a method for manufacturing the high-strength hot-rolled steel sheet. A high-strength hot-rolled steel sheet having high burring formability contains, on a mass percent basis, C: 0.06% or more and 0.13% or less, Si: less than 0.5%, Mn: more than 0.5% and 1.4% or less, P: 0.05% or less, S: 0.005% or less, N: 0.01% or less, Al: 0.1% or less, Ti: 0.05% or more and 0.25% or less, and V: more than 0.15% and 0.4% or less such that S, N, Ti, and V satisfy Ti.+V≧0.35 (wherein Ti.═Ti—N×(48/14)−S×(48/32), and S, N, Ti, and V denote the amounts (% by mass) of the corresponding elements), the remainder being Fe and incidental impurities, wherein the high-strength hot-rolled steel sheet has a microstructure in which a ferrite phase fraction is more than 90%, a carbide containing Ti is precipitated, and 70% or more of the carbide has a grain size of less than 9 nm.

Abstract translation: 提供了一种具有高切削成形性的高强度热轧钢板和一种制造该高强度热轧钢板的方法。 具有高成型性的高强度热轧钢板以质量％计含有C：0.06％以上且0.13％以下，Si：小于0.5％，Mn：大于0.5％和1.4％，或 较小，P：0.05％以下，S：0.005％以下，N：0.01％以下，Al：0.1％以下，Ti：0.05％以上且0.25％以下，V：大于0.15％， 0.4％以下，使得S，N，Ti和V满足Ti +V≥0.35（其中Ti = Ti-N×（48/14）-S×（48/32），S，N，Ti ，V表示相应元素的量（质量％）），余量为Fe和附带杂质，其中高强度热轧钢板具有铁素体相分数大于90％的微观结构， 含有Ti的碳化物析出，70％以上的碳化物的晶粒尺寸小于9nm。

公开(公告)号：US11560604B2

公开(公告)日：2023-01-24

申请号：US16497507

申请日：2017-05-25

Applicant: JFE Steel Corporation

Inventor： Tomohiro Ishii ,  Mitsuyuki Fujisawa ,  Reiko Sugihara ,  Chikara Kami

IPC: C21D9/46 ,  C21D6/00 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/52 ,  C22C38/54

Abstract: Provided is a ferritic stainless steel in which cracking is unlikely to be caused in the vicinity of a weld zone by the stress due to expansion, contraction, and deformation due to the thermal effect of welding in the case of performing welding after deep drawing and which is excellent in corrosion resistance in the vicinity of the weld zone.
The ferritic stainless steel has a composition containing C: 0.001% to 0.020%, Si: 0.01% to 0.30%, Mn: 0.01% to 0.50%, P: 0.04% or less, S: 0.01% or less, Cr: 18.0% to 24.0%, Ni: 0.01% to 0.40%, Mo: 0.30% to 3.0%, Al: 0.01% to 0.15%, Ti: 0.01% to 0.50%, Nb: 0.01% to 0.50%, V: 0.01% to 0.50%, Co: 0.01% to 6.00%, B: 0.0002% to 0.0050%, and N: 0.001% to 0.020% on a mass basis, the remainder being Fe and inevitable impurities. The composition satisfies 0.30%≤Ti+Nb+V≤0.60%.

公开(公告)号：US11220732B2

公开(公告)日：2022-01-11

申请号：US16310956

申请日：2017-06-15

Applicant: JFE Steel Corporation

Inventor： Hidetaka Kawabe ,  Shuji Nishida ,  Mitsuyuki Fujisawa ,  Chikara Kami

IPC: C22C38/42 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/52 ,  C22C38/54 ,  C22C38/60

Abstract: Provided is a ferritic stainless steel sheet excellent in shape of weld zone and corrosion resistance of a weld zone with a material of a different kind formed by performing welding with austenitic stainless steel.
A ferritic stainless steel sheet having a chemical composition containing, by mass %, C: 0.003% to 0.020%, Si: 0.01% to 1.00%, Mn: 0.01% to 0.50%, P: 0.040% or less, S: 0.010% or less, Cr: 20.0% to 24.0%, Cu: 0.20% to 0.80%, Ni: 0.01% to 0.60%, Al: 0.01% to 0.08%, N: 0.003% to 0.020%, Nb: 0.40% to 0.80%, Ti: 0.01% to 0.10%, Zr: 0.01% to 0.10%, and the balance being Fe and inevitable impurities, in which relational expression (1) below is satisfied: 3.0≥Nb/(2Ti+Zr+0.5Si+5Al)≥1.5  (1), here, in relational expression (1), each of the atomic symbols denotes the content (mass %) of the corresponding chemical element.

公开(公告)号：US10988825B2

公开(公告)日：2021-04-27

申请号：US16090649

申请日：2017-03-09

Applicant: JFE STEEL CORPORATION

Inventor： Tetsuyuki Nakamura ,  Shin Ishikawa ,  Chikara Kami

IPC: C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/52 ,  C22C38/54 ,  C22C38/58 ,  C21D9/46 ,  C21D6/00 ,  C21D8/02

Abstract: A martensitic stainless steel has a chemical composition containing, by mass %, C: 0.030% or more and less than 0.20%, Si: 0.01% or more and 2.0% or less, Mn: 0.01% or more and 3.0% or less, P: 0.050% or less , S: 0.010% or less, Cr: 10.0% or more and 16.0% or less, Ni: 0.01% or more and 0.80% or less, Al: 0.001% or more and 0.50% or less, Zr: 0.005% or more and 0.50% or less, and N: 0.030% or more and less than 0.20%, with the balance consisting of Fe and inevitable impurities.

公开(公告)号：US10714764B2

公开(公告)日：2020-07-14

申请号：US16064633

申请日：2016-12-15

Applicant: JFE STEEL CORPORATION

Inventor： Takayoshi Yano ,  Shin Ishikawa ,  Chikara Kami

IPC: H01M8/0247 ,  H01M8/021 ,  H01M8/0228 ,  C25D11/34 ,  H01M8/0202 ,  C25D7/00 ,  C25D5/36 ,  H01M8/0226 ,  H01M8/0243 ,  H01M8/0232 ,  H01M8/0245 ,  H01M8/10

Abstract: A stainless steel sheet for fuel cell separators including a substrate made of stainless steel sheet, and low-electrical-resistivity metal particles, where the substrate has a textured structure formed on a surface thereof with the average interval between the projected parts of the textured structure being 10 nm or more and 300 nm or less, the low-electrical-resistivity metal particles have an average particle size of 50 nm to 1.0 μm, the low-electrical-resistivity metal particles are attached to the surface of the substrate having the textured structure at a density of 1.0 particle or more for 1 μm2, and a ratio of the average particle size of the low-electrical-resistivity metal particles to the average interval between the projected parts is 1.0 to 15.0.

公开(公告)号：US10450625B2

公开(公告)日：2019-10-22

申请号：US15325145

申请日：2015-07-23

Applicant: JFE STEEL CORPORATION

Inventor： Kunio Fukuda ,  Mitsuyuki Fujisawa ,  Tomohiro Ishii ,  Shin Ishikawa ,  Chikara Kami

IPC: C21D9/46 ,  C23C8/26 ,  C22C38/54 ,  C22C38/50 ,  C22C38/48 ,  C21D6/00 ,  C22C38/44 ,  C22C38/42 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D8/02 ,  C22C38/46

Abstract: Provided is a ferritic stainless steel that has excellent corrosion resistance and displays good brazing properties when brazing is carried out at high temperature using a Ni-containing brazing metal. These effects are obtained as a result of the steel having a chemical composition containing, in mass %: 0.003%-0.020% of C; 0.05%-1.00% of Si; 0.10%-0.50% of Mn, 0.04% or less of P; 0.01% or less of S; 16.0%-25.0% of Cr; 0.05%-0.60% of Ni; 0.25%-0.45% of Nb; 0.005%-0.15% of Al; 0.005%-0.030% of N; and at least one selected from 0.50%-2.50% of Mo and 0.05%-0.80% of Cu, the balance being Fe and incidental impurities, and as a result of a nitrogen-enriched layer being created that has a nitrogen concentration peak value of 0.03 to 0.30 mass % at a depth of within 0.05 μm of a surface of the steel.