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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 10329637 B1

PDFFull Text
Date of Patent:
Jun. 25, 2019

Filed:

Apr. 23, 2015

Heat-rolled steel plate for tailored rolled blank, tailored rolled blank, and methods for producing these

Applicant:

Nippon Steel & Sumitomo Metal Corporation, Tokyo, JP;

Inventors:

Tatsuo Yokoi, Oita, JP;

Eisaku Sakurada, Tokai, JP;

Natsuko Sugiura, Kimitsu, JP;

Kiyoyuki Fukui, Tokyo, JP;

Assignee:

NIPPON STEEL & SUMITOMO METAL CORPORATION, Tokyo, JP;

Attorney:

Clark & Brody

Primary Examiner:

Jessee R Roe

Int. Cl.
CPC ...
C21D 9/46 (2006.01); C22C 38/00 (2006.01); C22C 38/58 (2006.01); C21D 6/02 (2006.01); C21D 8/02 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/08 (2006.01); C22C 38/12 (2006.01); C22C 38/14 (2006.01); C22C 38/16 (2006.01); C22C 38/28 (2006.01); C22C 38/30 (2006.01); C23C 2/06 (2006.01); C23C 2/28 (2006.01); B21D 22/20 (2006.01);
U.S. Cl.
CPC ...
C21D 9/46 (2013.01); C21D 6/02 (2013.01); C21D 8/0226 (2013.01); C21D 8/0236 (2013.01); C21D 8/0263 (2013.01); C21D 8/0278 (2013.01); C22C 38/00 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/005 (2013.01); C22C 38/008 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/08 (2013.01); C22C 38/12 (2013.01); C22C 38/14 (2013.01); C22C 38/16 (2013.01); C22C 38/28 (2013.01); C22C 38/30 (2013.01); C22C 38/58 (2013.01); C23C 2/06 (2013.01); C23C 2/285 (2013.01); B21D 22/20 (2013.01); C21D 2211/002 (2013.01); C21D 2211/005 (2013.01);
Abstract

A heat-rolled steel plate has a chemical composition that contains, in mass %, C, Si, Mn, P, S, Al, N and Ti, and that satisfies Formula (1); and a microstructure containing bainite and ferrite. In the interior of the steel plate an average value of pole densities of an orientation group {100}<011> to {223}<110> is 4 or less, and a pole density of a {332}<113> crystal orientation is 4.8 or less. In an outer layer of the steel plate, a pole density of a {110}<001> crystal orientation is 2.5 or more. Furthermore, among Ti carbo-nitrides in the steel plate, the number density of fine Ti carbo-nitrides having a particle diameter of 10 nm or less is 1.0×10per cmor less, and a bake hardening amount is 15 MPa or more.[Ti]−48/14×[N]−48/32×[S]≥0  (1)

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