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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 10633730 B1

PDFFull Text
Date of Patent:
Apr. 28, 2020

Filed:

Jul. 02, 2015

Material for cold-rolled stainless steel sheet

Applicant:

Jfe Steel Corporation, Tokyo, JP;

Inventors:

Ayako Ta, Chiba, JP;

Yukihiro Matsubara, Kurashiki, JP;

Yukio Kimura, Fukuyama, JP;

Masataka Yoshino, Chiba, JP;

Keisuke Nakazono, Chiba, JP;

Sumio Kaiho, Chiba, JP;

Saiichi Murata, Chiba, JP;

Nobukazu Kitagawa, Chiba, JP;

Assignee:

JFE Steel Corporation, Tokyo, JP;

Attorney:

RatnerPrestia

Primary Examiner:

Jie Yang

Int. Cl.
CPC ...
C21D 9/46 (2006.01); C22C 38/54 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/42 (2006.01); C22C 38/44 (2006.01); C22C 38/46 (2006.01); C22C 38/48 (2006.01); C22C 38/50 (2006.01); C22C 38/52 (2006.01); C22C 38/18 (2006.01); C21D 6/00 (2006.01); C21D 8/02 (2006.01); C22C 38/24 (2006.01); C22C 38/40 (2006.01); C22C 38/08 (2006.01); C22C 38/12 (2006.01); C22C 38/26 (2006.01); C22C 38/10 (2006.01); C22C 38/14 (2006.01); C22C 38/30 (2006.01); C22C 38/16 (2006.01); C22C 38/20 (2006.01); C22C 38/28 (2006.01);
U.S. Cl.
CPC ...
C22C 38/54 (2013.01); C21D 6/004 (2013.01); C21D 6/005 (2013.01); C21D 6/007 (2013.01); C21D 6/008 (2013.01); C21D 8/0205 (2013.01); C21D 8/0226 (2013.01); C21D 8/0236 (2013.01); C21D 8/0273 (2013.01); C21D 9/46 (2013.01); C22C 38/00 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/005 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/18 (2013.01); C22C 38/42 (2013.01); C22C 38/44 (2013.01); C22C 38/46 (2013.01); C22C 38/48 (2013.01); C22C 38/50 (2013.01); C22C 38/52 (2013.01); C21D 8/02 (2013.01); C21D 2211/005 (2013.01); C21D 2211/008 (2013.01); C22C 38/004 (2013.01); C22C 38/08 (2013.01); C22C 38/10 (2013.01); C22C 38/105 (2013.01); C22C 38/12 (2013.01); C22C 38/14 (2013.01); C22C 38/16 (2013.01); C22C 38/20 (2013.01); C22C 38/24 (2013.01); C22C 38/26 (2013.01); C22C 38/28 (2013.01); C22C 38/30 (2013.01); C22C 38/40 (2013.01);
Abstract

Provided is a material for a cold-rolled stainless steel sheet having a chemical composition containing, by mass %, C: 0.01% to 0.05%, Si: 0.02% to 0.75%, Mn: 0.1% to 1.0%, P: 0.04% or less, S: 0.01% or less, Cr: 16.0% to 18.0%, Al: 0.001% to 0.10%, N: 0.01% to 0.06% and the balance being Fe and inevitable impurities. The material has a metallographic structure including a martensite phase having an area ratio of 5% to 50% and the balance being a ferrite phase. A ferrite phase in portions extending from surface layers of front and back surfaces of a steel sheet has an average grain diameter of 20 μm or more and 50 μm or less, and a ferrite phase in a central portion of the sheet includes an unrecrystallized ferrite phase.

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