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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 12629741 B1

PDFFull Text
Date of Patent:
May. 19, 2026

Filed:

Nov. 17, 2022

Steel sheet for hot press forming, method of producing steel sheet for hot press forming, and method of producing hot pressed member

Applicant:

Jfe Steel Corporation, Tokyo, JP;

Inventors:

Rinta Sato, Tokyo, JP;

Kazuhiko Yamazaki, Tokyo, JP;

Yoichi Makimizu, Tokyo, JP;

Minoru Tanaka, Tokyo, JP;

Assignee:

JFE STEEL CORPORATION, Tokyo, JP;

Attorney:

KENJA IP LAW PC

Primary Examiner:

Michael E La Villa

Int. Cl.
CPC ...
B21D 22/02 (2006.01); B21D 22/20 (2006.01); B32B 15/01 (2006.01); B32B 15/04 (2006.01); B32B 15/18 (2006.01); B32B 15/20 (2006.01); C21D 1/18 (2006.01); C21D 8/0247 (2026.01); C21D 9/00 (2006.01); C21D 9/46 (2006.01); C21D 9/48 (2006.01); C22C 21/02 (2006.01); C22C 21/04 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/60 (2006.01); C23C 2/12 (2006.01); C23C 2/26 (2006.01); C23C 2/28 (2006.01); C23C 2/40 (2006.01); C23C 28/00 (2006.01); C23C 30/00 (2006.01);
U.S. Cl.
CPC ...
B21D 22/022 (2013.01); B21D 22/208 (2013.01); B32B 15/012 (2013.01); B32B 15/04 (2013.01); B32B 15/043 (2013.01); B32B 15/18 (2013.01); B32B 15/20 (2013.01); C21D 1/18 (2013.01); C21D 8/0263 (2013.01); C21D 9/00 (2013.01); C21D 9/46 (2013.01); C21D 9/48 (2013.01); C22C 21/02 (2013.01); C22C 21/04 (2013.01); C22C 38/00 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/60 (2013.01); C23C 2/12 (2013.01); C23C 2/26 (2013.01); C23C 2/28 (2013.01); C23C 2/29 (2022.08); C23C 2/40 (2013.01); C23C 28/321 (2013.01); C23C 28/322 (2013.01); C23C 28/345 (2013.01); C23C 30/00 (2013.01); C23C 30/005 (2013.01); Y10T 428/12757 (2015.01); Y10T 428/12972 (2015.01); Y10T 428/2495 (2015.01); Y10T 428/24967 (2015.01); Y10T 428/24975 (2015.01); Y10T 428/264 (2015.01); Y10T 428/265 (2015.01);
Abstract

A steel sheet for hot press forming that can reduce diffusible hydrogen content introduced in hot press forming without controlling the atmosphere dew point, and may be used to obtain a hot pressed member that has excellent post-coating corrosion resistance. The steel sheet includes a base steel sheet and a coated layer on both sides of the base steel sheet. The coated layer has a chemical composition containing Si: 7 mass % to 11 mass %, Mg: 0.6 mass % to 1.9 mass %, one or both of Ca and Sr: in total, 1.0% to 10% of Mg, and Fe: 0 mass % to 30 mass %, with the balance being Al and inevitable impurity. Concentration of Mg solute in Al phase in the coated layer is less than 1 mass %, and average thickness of the coated layer is 10 μm to 30 μm on each side of the base steel sheet.

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