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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 9499873 B1

PDFFull Text
Date of Patent:
Nov. 22, 2016

Filed:

Dec. 03, 2013

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Applicant:

Nippon Steel & Sumitomo Metal Corporation, Tokyo, JP;

Inventors:

Naoki Saitoh, Nagoya, JP;

Mitsuru Sawamura, Tokai, JP;

Katsumi Kurebayashi, Tokai, JP;

Yasunori Takahashi, Tokai, JP;

Takumi Miyake, Tokai, JP;

Assignee:

NIPPON STEEL & SUMITOMO METAL CORPORATION, Tokyo, JP;

Attorney:

Birch, Stewart, Kolasch & Birch, LLP

Primary Examiner:

Deborah Yee

Int. Cl.
CPC ...
C22C 38/44 (2006.01); C22C 38/46 (2006.01); C22C 38/54 (2006.01); C21D 1/30 (2006.01); C21D 8/02 (2006.01); C22C 38/00 (2006.01); C21D 6/00 (2006.01); C21D 9/50 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/42 (2006.01); C22C 38/50 (2006.01); C21D 9/46 (2006.01);
U.S. Cl.
CPC ...
C21D 1/30 (2013.01); C21D 6/004 (2013.01); C21D 8/02 (2013.01); C21D 9/46 (2013.01); C21D 9/50 (2013.01); C21D 9/505 (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 38/42 (2013.01); C22C 38/44 (2013.01); C22C 38/46 (2013.01); C22C 38/50 (2013.01); C22C 38/54 (2013.01); C21D 2211/002 (2013.01); C21D 2211/008 (2013.01); Y10T 428/12 (2015.01);
Abstract

In a steel plate according to the present invention, a chemical composition is within a predetermined range, an α value is 0.13 to 1.0 mass %, a β value is 8.45 to 15.2, an yield strength is 670 to 870 N/mm, a tensile strength is 780 to 940 N/mm, an average grain size at ½t of the steel plate is 35 μm or less, and a plate thickness is 25 to 200 mm. In the steel plate according to the present invention, in a case where SR is performed on the steel, a charpy absorbed energy at −40° C. in an area in which SR is performed may be 100 J or more.

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