logo

For the Inventor, By the Inventor

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 9359663 B1

PDFFull Text
Date of Patent:
Jun. 07, 2016

Filed:

Jan. 17, 2014

Manufacturing method for hot press formed steel member

Applicant:

Kobe Steel, Ltd., Kobe, JP;

Inventors:

Naoki Mizuta, Kakogawa, JP;

Tatsuya Asai, Kakogawa, JP;

Takayuki Yamano, Kakogawa, JP;

Tetsuji Hoshika, Kakogawa, JP;

Assignee:

Kobe Steel, Ltd., Kobe, JP;

Attorney:

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

Primary Examiner:

Rebecca Lee

Int. Cl.
CPC ...
C21D 8/00 (2006.01); C22C 38/38 (2006.01); B21D 22/02 (2006.01); C21D 6/00 (2006.01); C22C 38/28 (2006.01); C22C 38/04 (2006.01); C22C 38/00 (2006.01); B21D 53/88 (2006.01); C22C 38/14 (2006.01); C22C 38/58 (2006.01); B21D 22/20 (2006.01); C21D 1/673 (2006.01); B32B 15/01 (2006.01); C22C 38/02 (2006.01); C22C 38/06 (2006.01); C22C 38/08 (2006.01); C22C 38/12 (2006.01); C22C 38/16 (2006.01); C22C 38/32 (2006.01);
U.S. Cl.
CPC ...
C22C 38/38 (2013.01); B21D 22/022 (2013.01); B21D 22/208 (2013.01); B21D 53/88 (2013.01); B32B 15/013 (2013.01); C21D 1/673 (2013.01); C21D 6/001 (2013.01); C21D 6/002 (2013.01); C21D 6/005 (2013.01); C21D 6/008 (2013.01); C21D 8/005 (2013.01); C22C 38/00 (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 38/08 (2013.01); C22C 38/12 (2013.01); C22C 38/14 (2013.01); C22C 38/16 (2013.01); C22C 38/28 (2013.01); C22C 38/32 (2013.01); C22C 38/58 (2013.01); C21D 2211/008 (2013.01);
Abstract

Provided is a method for manufacturing a hot press formed steel member that has high strengths, an excellent balance between strength and ductility, and good deformation properties upon crush on collision (crashworthiness). The manufacturing method is highly efficient and allows a high degree of freedom with respect to the shape to be formed. The method manufactures a steel member by heating a steel sheet having a specific chemical composition and subjecting the steel sheet to at least one time of hot press forming. In the method, the heating temperature is equal to or higher than the Actransformation temperature, and a starting temperature of the hot press forming is in the range from the heating temperature to martensite start (Ms) temperature. Cooling from [(Ms temperature)−150° C.] down to 80° C. is performed so that a tempering parameter (λ) specified by Expression (1) is in the range from 7100 to 8030.

Find Patent Forward Citations

Loading…