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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 9605335 B1

PDFFull Text
Date of Patent:
Mar. 28, 2017

Filed:

Mar. 28, 2013

Hot-dip galvanized steel sheet for stamping having excellent cold workability, die hardenability, and surface quality, and producing method thereof

Applicants:

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

Voestalpine Stahl Gmbh, Linz, AT;

Inventors:

Michiharu Nakaya, Kakogawa, JP;

Tatsuya Asai, Kakogawa, JP;

Andreas Pichler, Voecklabruck, AT;

Thomas Kurz, Linz, AT;

Assignees:

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

VOESTALPINE STAHL GmbH, Linz, AT;

Attorney:

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

Primary Examiner:

Deborah Yee

Int. Cl.
CPC ...
C22C 38/28 (2006.01); C22C 38/32 (2006.01); C21D 8/04 (2006.01); C23C 2/02 (2006.01); C23C 2/06 (2006.01); C21D 9/46 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/38 (2006.01); C21D 8/02 (2006.01); B32B 15/01 (2006.01); C21D 9/48 (2006.01);
U.S. Cl.
CPC ...
C23C 2/02 (2013.01); B32B 15/013 (2013.01); C21D 8/0236 (2013.01); C21D 8/0263 (2013.01); C21D 8/0284 (2013.01); C21D 8/0436 (2013.01); C21D 8/0473 (2013.01); C21D 9/46 (2013.01); C22C 38/00 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/28 (2013.01); C22C 38/32 (2013.01); C22C 38/38 (2013.01); C23C 2/06 (2013.01); C21D 9/48 (2013.01); C21D 2211/003 (2013.01); C21D 2211/005 (2013.01); C21D 2211/009 (2013.01); Y10T 428/12799 (2015.01);
Abstract

Disclosed is a hot-dip galvanized steel sheet for stamping, which has excellent cold workability, has such satisfactory surface quality as to be free from unplating and other defects even in the absence of dedicated facilities, and ensures a strength of 1370 MPa or more after quenching even when cooled at a low rate. Also disclosed is a method effective for the produce of the hot-dip galvanized steel sheet for stamping. The hot-dip galvanized steel sheet for stamping comprises a base steel sheet and a hot-dip galvanized layer on a surface of the base steel sheet, in which the base steel sheet has a predetermined chemical composition and has a microstructure comprising equiaxed ferrite having an average aspect ratio of 4.0 or less and cementite and/or pearlite having an average major axis of grains of 20 μm or less.

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