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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 10060005 B1

PDFFull Text
Date of Patent:
Aug. 28, 2018

Filed:

Mar. 26, 2015

High-strength hot-formed steel sheet member

Applicant:

Nippon Steel & Sumitomo Metal Corporation, Tokyo, JP;

Inventors:

Kazuo Hikida, Tokyo, JP;

Shinichiro Tabata, Tokyo, JP;

Nobusato Kojima, Tokyo, JP;

Takahiro Moriki, Tokyo, JP;

Assignee:

NIPPON STEEL & SUMITOMO METAL CORPORATION, Tokyo, JP;

Attorney:

Birch, Stewart, Kolasch & Birch, LLP

Primary Examiner:

Mark Kopec

Int. Cl.
CPC ...
C21D 9/00 (2006.01); C22C 38/04 (2006.01); C22C 38/28 (2006.01); C21D 9/46 (2006.01); C25D 3/22 (2006.01); C23C 2/06 (2006.01); B22D 11/00 (2006.01); C22C 38/54 (2006.01); C22C 38/50 (2006.01); C22C 38/48 (2006.01); C22C 38/32 (2006.01); C22C 38/26 (2006.01); C22C 38/24 (2006.01); C22C 38/22 (2006.01); C22C 38/20 (2006.01); C22C 38/06 (2006.01); C22C 38/02 (2006.01); C22C 38/00 (2006.01); C21D 8/02 (2006.01); C23C 2/40 (2006.01);
U.S. Cl.
CPC ...
C21D 9/46 (2013.01); B22D 11/001 (2013.01); C21D 8/0226 (2013.01); C21D 8/0236 (2013.01); C21D 8/0263 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/20 (2013.01); C22C 38/22 (2013.01); C22C 38/24 (2013.01); C22C 38/26 (2013.01); C22C 38/28 (2013.01); C22C 38/32 (2013.01); C22C 38/48 (2013.01); C22C 38/50 (2013.01); C22C 38/54 (2013.01); C23C 2/06 (2013.01); C23C 2/40 (2013.01); C25D 3/22 (2013.01);
Abstract

A high-strength hot-formed steel sheet member exhibiting both a consistent hardness and delayed-fracture resistance, and is characterized in that: the high-strength hot-formed steel sheet member has a prescribed chemical composition; the degree of Mn segregation α (=[maximum Mn concentration (mass %) at the sheet center in the thickness direction]/[average Mn concentration (mass %) at a depth of ¼ of the total thickness of the sheet from the surface]) is less than or equal to 1.6; the steel purity value as defined in JIS G 0555 (2003) is less than or equal to 0.08%; the average grain size for prior γ grains is less than or equal to 10 μm; and the number density of the residual carbides is less than or equal to 4×10particles/mm.

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