公开(公告)号：US20220170129A1

公开(公告)日：2022-06-02

申请号：US17442411

申请日：2019-03-26

Applicant: JFE STEEL CORPORATION

Inventor： Shuji NISHIDA ,  Masataka YOSHINO ,  Fagang GAO ,  Hiroshi YAMAGUCHI

IPC: C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/48 ,  C22C38/50 ,  C21D8/02

Abstract: There is provided a ferritic stainless steel sheet having excellent corrosion resistance and excellent hydrogen embrittlement resistance without requiring dehydrogenation treatment during its manufacture or incorporating large amounts of Ni, Cu, or Mn.
The ferritic stainless steel sheet has a chemical composition containing, by mass percent, C: 0.001% to 0.020%, Si: 0.10% to 0.60%, Mn: 0.10% to 0.60%, P: 0.040% or less, S: 0.030% or less, Al: 0.030% to 0.060%, Cr: 16.5% to 19.0%, Ti: 0.15% to 0.35% Nb: 0.30% to 0.60%, Ni: 0.01% to 0.60%, O (oxygen): 0.0025% to 0.0050%, and N: 0.001% to 0.020%, the balance being Fe and incidental impurities, in which the number of precipitates having a cross-sectional area of 5.0 μm2 or more is 300 or less in a 1-mm2 region, and the precipitates having a cross-sectional area of 5.0 μm2 or more has an average cross-sectional area of 20.0 μm2 or less.

公开(公告)号：US20170275722A1

公开(公告)日：2017-09-28

申请号：US15503958

申请日：2015-02-27

Applicant: JFE STEEL CORPORATION

Inventor： Shuji NISHIDA ,  Tomohiro ISHII ,  Tetsuyuki NAKAMURA ,  Mitsuyuki FUJISAWA ,  Chikara KAMI

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

CPC classification number: C21D9/46 ,  C21D6/004 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C21D2211/005 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/52 ,  C22C38/54 ,  C22C38/60

Abstract: Provided is a ferritic stainless steel sheet having excellent corrosion resistance and workability equal to or better than SUH409L. The ferritic stainless steel sheet contains 0.025% or less C, 0.01% to 1.00% Si, 0.05% to 1.00% Mn, 0.020% to 0.040% P, 0.030% or less S, 0.001% to 0.100% Al, 12.5% to 14.4% Cr, 0.01% to 0.80% Ni, 0.11% to 0.40% Ti, 0.010% to 0.100% Nb, and 0.020% or less N by mass %, the remainder being Fe and inevitable impurities.

公开(公告)号：US20240367253A1

公开(公告)日：2024-11-07

申请号：US18688788

申请日：2022-09-21

Applicant: JFE STEEL CORPORATION

Inventor： Shuji NISHIDA

IPC: B23K9/23 ,  B23K103/22 ,  B32B15/01 ,  F16B5/08

Abstract: A stainless steel and copper joined body is provided. A fillet welded lap joint that is a joined portion of stainless steel and copper is formed at an end of the copper. The Cu/Fe ratio of the fillet welded lap joint is 2.3 or more. The fillet welded lap joint includes multiple welding points that are continuous in the welding direction. The average diameter Dmean (mm) of the welding points and the copper thickness (mm) satisfy the relationship of the following Formula (1). The overlap ratio OR of welding points is 10% or more and 80% or less. 2 ⁢ t 0.5 ≤ D mean ≤ 10 ⁢ t 0.5 ( 1 )

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：US20250059615A1

公开(公告)日：2025-02-20

申请号：US18681514

申请日：2022-06-01

Applicant: JFE STEEL CORPORATION

Inventor： Shuji NISHIDA ,  Ayako TA ,  Hirokazu TANAKA ,  Yasutada SUNAMORI

IPC: C21D9/46 ,  C21D6/00 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/50 ,  C22C38/52 ,  C22C38/54 ,  C22C38/60 ,  C25F1/06

Abstract: Provided is a ferritic stainless steel sheet having both high whiteness and high image clarity. A surface of the ferritic stainless steel sheet is made up of plateau portions and valley portions, an area ratio of the plateau portions is 30% to 70%, Sdr of the plateau portions is 0.100 or less, Sdq of the valley portions is 0.20 or more, Sal is 50 μm or less, and Str is 0.30 or more.