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.:
Date of Patent:
May. 21, 2019
Filed:
Dec. 24, 2013
Applicant:
Posco, Pohang-si, Gyeongsangbuk-do, KR;
Inventors:
Kyong-Su Park, Pohang-si, KR;
Jae-Hoon Jang, Pohang-si, KR;
Assignee:
POSCO, Pohang-si, Gyeongsangbuk-do, KR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C22C 38/02 (2006.01); C22C 38/04 (2006.01); C21D 9/46 (2006.01); C21D 8/02 (2006.01); C22C 38/00 (2006.01); C21D 8/04 (2006.01); C21D 1/18 (2006.01);
U.S. Cl.
CPC ...
C21D 9/46 (2013.01); C21D 1/18 (2013.01); C21D 8/02 (2013.01); C21D 8/021 (2013.01); C21D 8/0236 (2013.01); C21D 8/0436 (2013.01); C21D 8/0447 (2013.01); C21D 8/0473 (2013.01); C22C 38/00 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C21D 2201/00 (2013.01); C21D 2211/001 (2013.01); C21D 2211/005 (2013.01); C21D 2211/008 (2013.01); C21D 2211/009 (2013.01);
Abstract
Disclosed are a quenched steel sheet and a method for manufacturing the same. The quenched steel sheet according to an aspect of the present invention contains, in terms of wt %, C: 0.05˜0.25%, Si: 0.5% or less (excluding 0), Mn: 0.1˜2.0%, P: 0.05% or less, S: 0.03% or less, the remainder Fe, and other unavoidable impurities, wherein a refined structure of the steel sheet comprises 90 volume % or more of martensite with a first hardness and martensite with a second hardness.