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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 10072324 B1

PDFFull Text
Date of Patent:
Sep. 11, 2018

Filed:

Aug. 05, 2013

Cold-rolled steel sheet and method for manufacturing same, and hot-stamp formed body

Applicant:

Nippon Steel & Sumitomo Metal Corporation, Chiyoda-ku, Tokyo, JP;

Inventors:

Toshiki Nonaka, Tokyo, JP;

Satoshi Kato, Tokyo, JP;

Kaoru Kawasaki, Tokyo, JP;

Toshimasa Tomokiyo, Tokyo, JP;

Assignee:

NIPPON STEEL & SUMITOMO METAL CORPORATION, Tokyo, JP;

Attorney:

Birch, Stewart, Kolasch & Birch, LLP

Primary Examiner:

Deborah Yee

Int. Cl.
CPC ...
C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C21D 9/46 (2006.01); C21D 8/02 (2006.01); C21D 8/04 (2006.01); C23C 2/02 (2006.01); C22C 38/58 (2006.01); C22C 38/00 (2006.01); C22C 38/12 (2006.01); C22C 38/14 (2006.01); C22C 38/18 (2006.01); B32B 15/01 (2006.01); C21D 6/00 (2006.01); C22C 38/16 (2006.01); C22C 38/22 (2006.01); C22C 38/26 (2006.01); C22C 38/28 (2006.01); C22C 38/32 (2006.01); C22C 38/34 (2006.01); C22C 38/38 (2006.01); C22C 38/54 (2006.01); C23C 2/06 (2006.01); C23C 2/12 (2006.01); C23C 2/26 (2006.01); C23C 30/00 (2006.01); C25D 5/36 (2006.01); C25D 5/48 (2006.01); C25D 7/00 (2006.01); C21D 1/18 (2006.01); C21D 9/48 (2006.01); C21D 1/673 (2006.01);
U.S. Cl.
CPC ...
C23C 2/02 (2013.01); B32B 15/012 (2013.01); B32B 15/013 (2013.01); C21D 6/002 (2013.01); C21D 6/004 (2013.01); C21D 6/005 (2013.01); C21D 6/008 (2013.01); C21D 8/0226 (2013.01); C21D 8/0236 (2013.01); C21D 8/0263 (2013.01); C21D 8/0278 (2013.01); C21D 8/0426 (2013.01); C21D 8/0436 (2013.01); C21D 8/0473 (2013.01); C21D 8/0478 (2013.01); C21D 9/46 (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 38/12 (2013.01); C22C 38/14 (2013.01); C22C 38/16 (2013.01); C22C 38/18 (2013.01); C22C 38/22 (2013.01); C22C 38/26 (2013.01); C22C 38/28 (2013.01); C22C 38/32 (2013.01); C22C 38/34 (2013.01); C22C 38/38 (2013.01); C22C 38/54 (2013.01); C22C 38/58 (2013.01); C23C 2/06 (2013.01); C23C 2/12 (2013.01); C23C 2/26 (2013.01); C23C 30/005 (2013.01); C25D 5/36 (2013.01); C25D 5/48 (2013.01); C25D 7/00 (2013.01); C21D 1/18 (2013.01); C21D 1/673 (2013.01); C21D 8/0442 (2013.01); C21D 9/48 (2013.01); C21D 2211/001 (2013.01); C21D 2211/005 (2013.01); C21D 2211/008 (2013.01); Y10T 428/12757 (2015.01); Y10T 428/12799 (2015.01);
Abstract

A cold-rolled steel sheet has a predetermined chemical composition, in which a structure before and after a hot-stamping includes ferrite: 30 area % to 90 area %, martensite: 0 area % or more and less than 20 area %, pearlite: 0 area % to 10 area %, retained austenite: 5 volume % to 20 volume %, and rest structure: bainite, a hardness of the retained austenite measured with a nano indenter before and after the hot-stamping satisfies relations of H/H<1.1 and σHM<20, and a relation of TS×El≥20000 MPa·% is satisfied.

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