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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 9790565 B1

PDFFull Text
Date of Patent:
Oct. 17, 2017

Filed:

Dec. 27, 2012

Hot-rolled stainless steel sheet having excellent hardness and low-temperature impact properties

Applicant:

Posco, Pohang-si, KR;

Inventors:

Dong Chul Chae, Gwangyang-si, KR;

Gyu Jin Jo, Gwangyang-si, KR;

Jae Hwa Lee, Gwangyang-si, KR;

Kwang Yuk Kim, Gwangyang-si, KR;

Assignee:

POSCO, Pohang-si, KR;

Attorney:

Cantor Colburn LLP

Primary Examiner:

Roy King

Assistant Examiner:

Caitlin Kiechle

Int. Cl.
CPC ...
C21D 8/02 (2006.01); C21D 7/13 (2006.01); C22C 38/04 (2006.01); C22C 38/02 (2006.01); C22C 38/00 (2006.01); C21D 9/46 (2006.01); C22C 38/58 (2006.01); C22C 38/40 (2006.01); C22C 38/44 (2006.01); C22C 38/48 (2006.01); C22C 38/50 (2006.01); C21D 6/00 (2006.01);
U.S. Cl.
CPC ...
C21D 8/02 (2013.01); C21D 6/004 (2013.01); C21D 7/13 (2013.01); C21D 9/46 (2013.01); C22C 38/001 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/40 (2013.01); C22C 38/44 (2013.01); C22C 38/48 (2013.01); C22C 38/50 (2013.01); C22C 38/58 (2013.01); C21D 2211/005 (2013.01); C21D 2211/008 (2013.01);
Abstract

A hot-rolled stainless steel sheet having excellent hardness and low-temperature impact properties, in which a ferrite is formed with martensite as a matrix structure, is manufactured by a steel manufacturing process, a continuous casting process, and a hot-rolling process. The hot-rolled stainless steel sheet comprises C, N, Si, Mn, Cr, Ni, Ti, Nb, Mo, and the remainder being Fe and other inevitable impurities, wherein C is 0.01 to 0.03 wt %, Cr is 11 to 14 wt %, Ti is 0.1 to 0.2 wt %, and Nb is 0.1 to 0.2 wt %. The ferrite stability (FS) expressed by the following [formula 1] is 5 to 50, and a ferrite is formed with martensite as a matrix structure. [Formula 1] 4 FS=−215−619C−16.6Mn+23.7Cr−36.8Ni+42.2Mo+96.2Ti+67Nb−237N+17.2Si, wherein the numerical value of each component described in [Formula 1] denotes the content (wt %) of each component.

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