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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 9840751 B1

PDFFull Text
Date of Patent:
Dec. 12, 2017

Filed:

Feb. 02, 2017

Method for manufacturing hot stamped body and hot stamped body

Applicant:

Nippon Steel & Sumitomo Metal Corporation, Tokyo, JP;

Inventors:

Kunio Hayashi, Tokyo, JP;

Toshimitsu Aso, Tokyo, JP;

Toshimasa Tomokiyo, Tokyo, JP;

Hitoshi Tanino, Toyota, JP;

Ryozo Wada, Obu, JP;

Assignee:

NIPPON STEEL & SUMITOMO METAL CORPORATION, Tokyo, JP;

Attorney:

Birch, Stewart, Kolasch & Birch, LLP

Primary Examiner:

Brian Walck

Int. Cl.
CPC ...
C22C 38/28 (2006.01); C21D 9/00 (2006.01); C22C 38/58 (2006.01); C22C 38/54 (2006.01); C22C 38/50 (2006.01); C22C 38/48 (2006.01); C22C 38/42 (2006.01); C22C 38/38 (2006.01); C22C 38/32 (2006.01); C22C 38/26 (2006.01); C22C 38/24 (2006.01); C22C 38/22 (2006.01); C22C 38/20 (2006.01); C22C 38/06 (2006.01); C22C 38/04 (2006.01); C22C 38/02 (2006.01); C22C 38/00 (2006.01); C21D 8/00 (2006.01); B21D 22/02 (2006.01);
U.S. Cl.
CPC ...
C21D 9/0068 (2013.01); B21D 22/022 (2013.01); C21D 8/005 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/005 (2013.01); C22C 38/008 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (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 38/38 (2013.01); C22C 38/42 (2013.01); C22C 38/48 (2013.01); C22C 38/50 (2013.01); C22C 38/54 (2013.01); C22C 38/58 (2013.01);
Abstract

Provided is a method for manufacturing a hot stamped body, the method including: a hot-rolling step; a coiling step; a cold-rolling step; a continuous annealing step; and a hot stamping step, in which the continuous annealing step includes a heating step of heating the cold-rolled steel sheet to a temperature range of equal to or higher than Ac° C. and lower than Ac° C.; a cooling step of cooling the heated cold-rolled steel sheet from the highest heating temperature to 660° C. at a cooling rate of equal to or less than 10° C./s; and a holding step of holding the cooled cold-rolled steel sheet in a temperature range of 550° C. to 660° C. for one minute to 10 minutes.

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