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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 9528172 B1

PDFFull Text
Expired
Date of Patent:
Dec. 27, 2016

Filed:

Sep. 02, 2011

High-strength steel sheet having improved resistance to fracture and to hic

Applicants:

Izuru Minato, Kashima, JP;

Nobuaki Takahashi, Kashima, JP;

Akio Yamamoto, Kashima, JP;

Inventors:

Izuru Minato, Kashima, JP;

Nobuaki Takahashi, Kashima, JP;

Akio Yamamoto, Kashima, JP;

Assignee:

NIPPON STEEL & SUMITOMO METAL CORPORATION, Tokyo, JP;

Attorney:

Clark & Brody

Primary Examiner:

Roy King

Assistant Examiner:

Jophy S Koshy

Int. Cl.
CPC ...
C22C 38/50 (2006.01); C21D 8/02 (2006.01); C22C 38/58 (2006.01); F16L 9/02 (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);
U.S. Cl.
CPC ...
C22C 38/50 (2013.01); C21D 8/0205 (2013.01); C21D 8/0226 (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 38/42 (2013.01); C22C 38/44 (2013.01); C22C 38/46 (2013.01); C22C 38/48 (2013.01); C22C 38/58 (2013.01); F16L 9/02 (2013.01); C21D 2211/002 (2013.01); C21D 2211/005 (2013.01); C21D 2211/009 (2013.01);
Abstract

A high-strength steel sheet having improved HIC resistance and fracture resistance even when it is thick has a chemical composition comprising, in mass %, C: 0.02-0.07%, Si: 0.05-0.50%, Mn: 1.10-1.60%, P: at most 0.015%, S: at most 0.0030%, Nb: 0.005-0.030%, Ti: 0.005-0.020%, Al: 0.005-0.060%, Ca: 0.0005-0.0060%, N: 0.0015-0.0070%, at least one of Cu, Ni, Cr, and Mo in a total of greater than 0.1% to less than 1.5%, and a remainder of Fe and impurities and a steel structure composed of at least 10% by area of bainite and a remainder of ferrite and pearlite. The degree of segregation is less than 1.6 for Nb and less than 1.4 for Mn in the central portion of the thickness of the steel sheet.

Find Patent Forward Citations

Minato, Izuru. (2016). High-strength steel sheet having improved resistance to fracture and to hic (U.S. Patent No. 9528172). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/9528172

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