公开(公告)号：US20220118740A1

公开(公告)日：2022-04-21

申请号：US17310471

申请日：2020-01-08

Applicant: JFE STEEL CORPORATION

Inventor： Akito MIZUTANI ,  Mitsuyuki FUJISAWA

IPC: B32B15/01 ,  C22C38/54 ,  C22C38/50 ,  C22C38/48 ,  C22C38/46 ,  C22C38/44 ,  C22C38/42 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D9/46 ,  C21D6/00

Abstract: A ferritic stainless steel sheet comprises a chemical composition containing, in mass %, C: 0.030% or less, Si: 1.0% or less, Mn: 1.0% or less, P: 0.040% or less, S: 0.010% or less, Cr: 11.0% to 30.0%, Al: 8.0% to 20.0%, Ni: 0.05% to 0.50%, Mo: 0.01% to 6.0%, N: 0.020% or less, and at least one selected from the group consisting of Zr: 0.01% to 0.20% and Hf: 0.01% to 0.20%, with a balance consisting of Fe and inevitable impurities.

公开(公告)号：US20200299800A1

公开(公告)日：2020-09-24

申请号：US16607420

申请日：2018-04-13

Applicant: JFE STEEL CORPORATION

Inventor： Shuji NISHIDA ,  Tomohiro ISHII ,  Masataka YOSHINO ,  Mitsuyuki FUJISAWA

IPC: C21D9/46 ,  C21D8/02 ,  C21D6/00 ,  C22C38/60 ,  C22C38/54 ,  C22C38/52 ,  C22C38/50 ,  C22C38/48 ,  C22C38/46 ,  C22C38/44 ,  C22C38/42 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00

Abstract: A ferritic stainless steel sheet having excellent corrosion resistance, formability, and ridging resistance and a method for manufacturing the same are provided. A ferritic stainless steel sheet has a chemical composition containing, in terms of mass %, C: 0.005 to 0.030%, Si: 0.05 to 1.00%, Mn: 0.05 to 1.00%, P: 0.040% or less, S: 0.030% or less, Al: 0.001 to 0.150%, Cr: 10.8 to 14.4%, Ni: 0.01 to 2.50%, and N: 0.005 to 0.060%, with the balance being Fe and incidental impurities. The elongation after fracture is 28% or more, and the ridging height of a surface of a steel sheet to which a tensile strain of 23% has been applied in a rolling direction is 3.0 μm or less.

公开(公告)号：US20230271405A1

公开(公告)日：2023-08-31

申请号：US18313370

申请日：2023-05-08

Applicant: JFE STEEL CORPORATION

Inventor： Akito MIZUTANI ,  Mitsuyuki FUJISAWA

IPC: B32B15/01 ,  C21D6/00 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C23C14/16

CPC classification number: B32B15/012 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D9/46 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C23C14/16

Abstract: A method of producing a ferritic stainless steel sheet comprises subjecting an Al vapor deposited layer-equipped stainless steel sheet to a heat treatment at 600° C. to 1300° C. for 1 minute or more. The Al vapor deposited layer-equipped stainless steel sheet comprises a ferritic stainless steel and an Al vapor deposited layer thereon. The ferritic stainless steel sheet has a thickness of 100 μm or less and a chemical composition containing, in mass %, C: ≤0.030%, Si: ≤1.0%, Mn: ≤1.0%, P: ≤0.040%, S: ≤0.010%, Cr: 11.0-30.0%, Al: 4.0-6.5%, Ni: 0.05-0.50%, Mo: 0.01-6.0%, N: ≤0.020% s, and Zr: 0.01-0.20% and/or Hf: 0.01-0.20%, with a balance consisting of Fe and inevitable impurities. A thickness of the Al vapor deposited layer per one side is 0.5-10.0 μm.

公开(公告)号：US20200002779A1

公开(公告)日：2020-01-02

申请号：US16480785

申请日：2018-01-12

Applicant: JFE STEEL CORPORATION

Inventor： Masataka YOSHINO ,  Mitsuyuki FUJISAWA

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

Abstract: 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 KIC of 25 MPa·m1/2 or more.

公开(公告)号：US20190275766A1

公开(公告)日：2019-09-12

申请号：US16302219

申请日：2017-04-21

Applicant: JFE STEEL CORPORATION

Inventor： Akito MIZUTANI ,  Mitsuyuki FUJISAWA

IPC: B32B15/01 ,  C22C38/50 ,  C22C38/48 ,  C22C38/46 ,  C22C38/44 ,  C22C38/42 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D9/46 ,  C21D8/02 ,  C21D6/00

Abstract: Disclosed is a ferritic stainless steel sheet including: a chemical composition containing, by mass %, C: 0.025% or less, Si: 0.01% to 2.0%, Mn: 0.01% to 1.0%, P: 0.050% or less, S: 0.010% or less, Cr: 10.5% to 20.0%, Al: 0.01% to 0.50%, Ni: 0.01% to 0.60%, Ti: 0.10% to 0.50%, and N: 0.025% or less, with the balance being Fe and inevitable impurities; and a coating layer including at least one coating layer selected from the group consisting of an Al coating layer, an Fe coating layer, and a Si coating layer on one or both sides thereof, in which the coating layer has a total thickness of 30 nm to 150 nm per side.

公开(公告)号：US20220267883A1

公开(公告)日：2022-08-25

申请号：US17630914

申请日：2020-06-04

Applicant: JFE STEEL CORPORATION

Inventor： Akito MIZUTANI ,  Mitsuyuki FUJISAWA

IPC: C22C38/58 ,  C21D9/46 ,  C22C38/02 ,  C22C38/42 ,  C22C38/44 ,  C22C38/54 ,  C22C38/00 ,  C21D8/02

Abstract: A predetermined chemical composition is contained, and a predetermined relationship of the contents of Ag, B and REM is satisfied.

公开(公告)号：US20220017984A1

公开(公告)日：2022-01-20

申请号：US17299308

申请日：2019-11-27

Applicant: JFE STEEL CORPORATION

Inventor： Keishi INOUE ,  Hidetaka KAWABE ,  Masataka YOSHINO ,  Mitsuyuki FUJISAWA

IPC: C21D9/46 ,  C21D8/02 ,  C21D6/00 ,  C22C38/60 ,  C22C38/54 ,  C22C38/52 ,  C22C38/50 ,  C22C38/46 ,  C22C38/44 ,  C22C38/42 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00

Abstract: A ferritic stainless steel sheet has a predetermined chemical composition and thickness, and has an area ratio of crystal grains of 45 μm or more in grain size of 20% or less.

公开(公告)号：US20190226045A1

公开(公告)日：2019-07-25

申请号：US16327988

申请日：2017-09-27

Applicant: JFE STEEL CORPORATION

Inventor： Masataka YOSHINO ,  Mitsuyuki FUJISAWA

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

Abstract: A hot-rolled and annealed ferritic stainless steel sheet which has sufficient corrosion resistance and with which it is possible to inhibit a crack from occurring when punching work is performed to form a thick-walled flange and a method for manufacturing the steel sheet. The hot-rolled and annealed ferritic stainless steel sheet has a chemical composition comprising, by 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 0.100%, Cr: 10.0% to 24.0%, Ni: 0.01% to 0.60%, Ti: 0.10% to 0.40%, N: 0.001% to 0.020%, and the balance being Fe and inevitable impurities, and a threshold stress intensity factor KIC of 20 MPa·m1/2 or more.

公开(公告)号：US20170349995A1

公开(公告)日：2017-12-07

申请号：US15538335

申请日：2015-11-17

Applicant: JFE STEEL CORPORATION

Inventor： Kunio FUKUDA ,  Shin ISHIKAWA ,  Mitsuyuki FUJISAWA ,  Katsuhisa YAMAUCHI ,  Chikara KAMI

IPC: C23C8/26 ,  C22C38/42 ,  C22C38/02 ,  C21D1/76 ,  C22C38/00 ,  C21D9/46 ,  C22C38/48 ,  C22C38/04

Abstract: Provided is a ferritic stainless steel having a chemical composition containing, in mass %: 0.003% to 0.025% of C; 0.05% to 1.00% of Si; 0.05% to 1.00% of Mn; 0.04% or less of P; 0.01% or less of S; 16.0% to 23.0% of Cr; 0.20% to 0.80% of Cu; 0.05% to 0.60% of Ni; 0.20% to 0.70% of Nb; 0.005% to 0.020% of N; and the balance being Fe and incidental impurities, in which a nitrogen-enriched layer is present that has a nitrogen concentration peak value of 0.03 mass % to 0.30 mass % at a depth of within 0.05 μm of a surface of the steel.

公开(公告)号：US20170349984A1

公开(公告)日：2017-12-07

申请号：US15533499

申请日：2015-07-02

Applicant: JFE STEEL CORPORATION

Inventor： Akito MIZUTANI ,  Masataka YOSHINO ,  Mitsuyuki FUJISAWA ,  Ayako TA

IPC: C22C38/40 ,  C22C38/02 ,  C21D9/46 ,  C22C38/00 ,  C22C38/06 ,  C22C38/04

CPC classification number: C22C38/40 ,  C21D6/002 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C21D8/0273 ,  C21D9/46 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/00 ,  C22C38/001 ,  C22C38/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/50 ,  C22C38/52 ,  C22C38/54

Abstract: Stainless steel that has excellent formability and ridging resistance and can be produced with high productivity is provided. The stainless steel comprises: a chemical composition containing, in mass %, C: 0.005% to 0.050%, Si: 0.01% to 1.00%, Mn: 0.01% to 1.0%, P: 0.040% or less, S: 0.010% or less, Cr: 15.5% to 18.0%, Ni: 0.01% to 1.0%, Al: 0.001% to 0.10%, and N: 0.005% to 0.06%, with a balance being Fe and incidental impurities; and a microstructure containing a martensite phase of 1% to 10% in volume fraction with respect to a whole volume of the microstructure.