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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 11344941 B1

PDFFull Text
Date of Patent:
May. 31, 2022

Filed:

Jul. 18, 2012

Method of manufacturing hot-press-formed steel member

Applicants:

Takayuki Yamano, Kakogawa, JP;

Jiro Iwaya, Kakogawa, JP;

Noriyuki Jimbo, Kakogawa, JP;

Tatsuya Asai, Kakogawa, JP;

Naoki Mizuta, Kakogawa, JP;

Inventors:

Takayuki Yamano, Kakogawa, JP;

Jiro Iwaya, Kakogawa, JP;

Noriyuki Jimbo, Kakogawa, JP;

Tatsuya Asai, Kakogawa, JP;

Naoki Mizuta, Kakogawa, JP;

Assignee:

Kobe Steel, Ltd., Kobe, JP;

Attorney:

Oblon, McClelland, Maier & Neustadt, L.L.P.

Primary Examiner:

Paul A Wartalowicz

Assistant Examiner:

Stephani Hill

Int. Cl.
CPC ...
B21D 22/02 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/14 (2006.01); C22C 38/28 (2006.01); C22C 38/34 (2006.01); C22C 38/38 (2006.01); C22C 38/42 (2006.01); C22C 38/50 (2006.01); C22C 38/54 (2006.01); C22C 38/30 (2006.01); C21D 1/673 (2006.01); B21D 22/20 (2006.01); C22C 38/58 (2006.01); C21D 8/02 (2006.01); C22C 38/32 (2006.01);
U.S. Cl.
CPC ...
B21D 22/022 (2013.01); B21D 22/208 (2013.01); C21D 1/673 (2013.01); C21D 8/0247 (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 38/14 (2013.01); C22C 38/28 (2013.01); C22C 38/30 (2013.01); C22C 38/32 (2013.01); C22C 38/34 (2013.01); C22C 38/38 (2013.01); C22C 38/42 (2013.01); C22C 38/50 (2013.01); C22C 38/54 (2013.01); C22C 38/58 (2013.01); C21D 2211/002 (2013.01); C21D 2211/008 (2013.01);
Abstract

In a method for obtaining a hot-press-formed steel member, a steel sheet containing-mass % of C,-mass % of Si,-mass % of Si and Al in total, and-mass % of Mn is heated at a heating temperature of not less than the Actransformation point. The steel sheet is hot-press formed for one or more times. The starting temperature of the hot pressing is not more than the heating temperature but not less than the Ms point. The average cooling rate from (Ms point−)° C. to° C. is° C./s or less. The hot-press-formed steel member has high strength, high tensile elongation, high bendability, excellent deformation characteristics at the time of collision crush, and excellent delayed fracture resistance.

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