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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 9592772 B1

PDFFull Text
Date of Patent:
Mar. 14, 2017

Filed:

Feb. 28, 2012

Zn—al—mg based alloy hot-dip plated steel sheet, and method for producing the same

Applicants:

Kentaro Hirata, Hiroshima, JP;

Yukio Katagiri, Hiroshima, JP;

Susumu Fujiwara, Hiroshima, JP;

Kazuaki Hosomi, Osaka, JP;

Masaaki Uranaka, Osaka, JP;

Inventors:

Kentaro Hirata, Hiroshima, JP;

Yukio Katagiri, Hiroshima, JP;

Susumu Fujiwara, Hiroshima, JP;

Kazuaki Hosomi, Osaka, JP;

Masaaki Uranaka, Osaka, JP;

Assignee:

NISSHIN STEEL CO., LTD., Tokyo, JP;

Attorney:

Clark & Brody

Primary Examiner:

Adam Krupicka

Int. Cl.
CPC ...
C22C 38/04 (2006.01); C22C 38/14 (2006.01); B60R 13/00 (2006.01); C21D 8/02 (2006.01); C23C 2/06 (2006.01); C23C 2/40 (2006.01); B32B 15/01 (2006.01); C22C 18/04 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/06 (2006.01); C22C 38/28 (2006.01); C22C 38/38 (2006.01); C23C 2/02 (2006.01); C22C 23/02 (2006.01); C22C 23/04 (2006.01); C22C 38/12 (2006.01); C22C 38/32 (2006.01);
U.S. Cl.
CPC ...
B60R 13/00 (2013.01); B32B 15/013 (2013.01); C21D 8/0205 (2013.01); C21D 8/0278 (2013.01); C22C 18/04 (2013.01); C22C 23/02 (2013.01); C22C 23/04 (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 38/12 (2013.01); C22C 38/14 (2013.01); C22C 38/28 (2013.01); C22C 38/32 (2013.01); C22C 38/38 (2013.01); C23C 2/02 (2013.01); C23C 2/06 (2013.01); C23C 2/40 (2013.01); C21D 2211/004 (2013.01); C21D 2211/005 (2013.01); Y10T 428/12799 (2015.01);
Abstract

[Problem] To provide a steel sheet hot-dip-plated with a Zn—Al—Mg-based alloy coating, which is remarkably improved in point of all the burring workability, the liquid metal embrittlement cracking resistance and the corrosion resistance in the welded part thereof, as a steel material favorable for arc-welded structural members. [Means for Resolution] A plated steel sheet having a Zn—Al—Mg-based alloy coating layer formed by hot-dipping on the surface of a base steel sheet for welded structural members, wherein the base steel sheet has a specific chemical composition and has a metallographic structure of such that Ti-containing precipitates having a mean particle diameter of at most 20 nm are dispersed in the matrix formed of a ferrite phase therein, and wherein the liquid metal embrittlement cracking sensitivity index H3 value of the base steel sheet represented by the following formula (3) and indicating the relationship between the contents of the steel components and the thickness t (mm) of the steel sheet is at most 2.90:H3 Value=C/0.2+Si/5.0+Mn/1.3+Cr/1.0+Mo/1.2+0.4−0.7(Cr+Mo)  (3)

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