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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 9938597 B1

PDFFull Text
Date of Patent:
Apr. 10, 2018

Filed:

Feb. 28, 2013

Method for manufacturing press-formed product and press-formed product

Applicant:

Kobe Steel, Ltd., Kobe-shi, JP;

Inventors:

Toshio Murakami, Kobe, JP;

Hideo Hata, Kobe, JP;

Junya Naitou, Kobe, JP;

Keisuke Okita, Kobe, JP;

Shushi Ikeda, Nagoya, JP;

Assignee:

Kobe Steel, Ltd., Kobe-shi, JP;

Attorney:

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

Primary Examiner:

Jennifer A Smith

Assistant Examiner:

Alexandra M Moore

Int. Cl.
CPC ...
C21D 8/00 (2006.01); C22C 38/00 (2006.01); C22C 38/60 (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 38/32 (2006.01); B21D 22/20 (2006.01); B21D 22/28 (2006.01); C21D 6/02 (2006.01); C22C 38/20 (2006.01); C22C 38/22 (2006.01); C22C 38/24 (2006.01); C22C 38/26 (2006.01); C22C 38/42 (2006.01); C22C 38/50 (2006.01); C22C 38/54 (2006.01); C21D 1/673 (2006.01); B62D 29/00 (2006.01);
U.S. Cl.
CPC ...
C21D 8/005 (2013.01); B21D 22/208 (2013.01); B21D 22/286 (2013.01); C21D 6/02 (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 38/14 (2013.01); C22C 38/20 (2013.01); C22C 38/22 (2013.01); C22C 38/24 (2013.01); C22C 38/26 (2013.01); C22C 38/28 (2013.01); C22C 38/32 (2013.01); C22C 38/42 (2013.01); C22C 38/50 (2013.01); C22C 38/54 (2013.01); C22C 38/60 (2013.01); B62D 29/007 (2013.01); C21D 1/673 (2013.01); C21D 2211/001 (2013.01); C21D 2211/004 (2013.01); C21D 2211/008 (2013.01);
Abstract

In the present invention, a press-formed product is manufactured by heating a steel sheet for hot pressing use to a temperature of 900° C. or above and 1,100° C. or below, the steel sheet for hot pressing use having a predetermined chemical component composition, some of Ti-containing precipitates contained in the steel sheet, each of which having an equivalent circle diameter of 30 nm or less, having an average equivalent circle diameter of 6 nm or less, and the precipitated Ti amount and the total Ti amount in the steel fulfilling the relationship represented by formula (1) shown below, thereafter starting press-forming, and holding at the bottom dead point and cooling to a temperature lower than the martensite transformation starting temperature Ms while securing the average cooling rate of 20° C./s or more within a tool.Precipitated Ti amount(mass %)−3.4[N]<0.5×[total Ti amount (mass %)−3.4[N]]  (1)(In the formula (1), [N] represents the content (mass %) of N in the steel.).

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