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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 9932652 B1

PDFFull Text
Date of Patent:
Apr. 03, 2018

Filed:

Mar. 31, 2015

Hot-stamped steel

Applicant:

Nippon Steel & Sumitomo Metal Corporation, Tokyo, JP;

Inventors:

Akihiro Sengoku, Sodegaura, JP;

Hiroshi Takebayashi, Tokai, JP;

Assignee:

NIPPON STEEL & SUMITOMO METAL CORPORATION, Tokyo, JP;

Attorney:

Birch, Stewart, Kolasch & Birch, LLP

Primary Examiner:

Michael E La Villa

Int. Cl.
CPC ...
C22C 38/50 (2006.01); C22C 38/32 (2006.01); C22C 38/28 (2006.01); C22C 38/26 (2006.01); C22C 38/22 (2006.01); C22C 38/06 (2006.01); C22C 38/04 (2006.01); C22C 38/02 (2006.01); C22C 38/00 (2006.01); C22C 38/54 (2006.01); C23C 2/06 (2006.01); C23C 2/40 (2006.01); B32B 15/01 (2006.01); C21D 9/46 (2006.01); C25D 3/22 (2006.01); C25D 5/36 (2006.01); C25D 7/00 (2006.01); C21D 1/18 (2006.01); C23C 2/28 (2006.01); C23C 28/02 (2006.01); C23C 2/00 (2006.01); C23C 30/00 (2006.01); B32B 15/04 (2006.01); B32B 15/18 (2006.01); C22C 38/58 (2006.01); C25D 5/50 (2006.01); C21D 9/00 (2006.01); C21D 1/673 (2006.01); C25D 3/24 (2006.01);
U.S. Cl.
CPC ...
C21D 9/46 (2013.01); B32B 15/011 (2013.01); B32B 15/013 (2013.01); B32B 15/04 (2013.01); B32B 15/043 (2013.01); B32B 15/18 (2013.01); C21D 1/18 (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 38/22 (2013.01); C22C 38/26 (2013.01); C22C 38/28 (2013.01); C22C 38/32 (2013.01); C22C 38/50 (2013.01); C22C 38/54 (2013.01); C22C 38/58 (2013.01); C23C 2/00 (2013.01); C23C 2/06 (2013.01); C23C 2/28 (2013.01); C23C 2/285 (2013.01); C23C 2/40 (2013.01); C23C 28/021 (2013.01); C23C 28/023 (2013.01); C23C 28/025 (2013.01); C23C 30/00 (2013.01); C23C 30/005 (2013.01); C25D 3/22 (2013.01); C25D 5/36 (2013.01); C25D 5/50 (2013.01); C25D 7/00 (2013.01); C21D 1/673 (2013.01); C21D 9/0068 (2013.01); C25D 3/24 (2013.01); Y10T 428/12792 (2015.01); Y10T 428/12799 (2015.01); Y10T 428/12958 (2015.01); Y10T 428/12972 (2015.01); Y10T 428/12979 (2015.01); Y10T 428/12993 (2015.01); Y10T 428/2495 (2015.01); Y10T 428/24942 (2015.01); Y10T 428/24983 (2015.01);
Abstract

Hot-stamped steel includes: a base metal that is steel including a tempered portion having hardness corresponding to 85% or less of the highest quenching hardness, the highest quenching hardness being defined as a Vickers hardness at a depth position spaced away from a surface by ¼ times a sheet thickness in a case of performing water quenching after heating at a temperature equal to or higher than an Apoint and retention for 30 minutes; and a Zn coating layer that is formed on the tempered portion of the base metal. The Zn coating layer includes a solid-solution layer including a solid-solution phase that contains Fe and Zn that is solid-soluted in Fe, and a lamella layer that includes the solid-solution phase and a capital gamma phase. An area ratio of the lamella layer in the Zn coating layer is 20% or less.

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