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Title:
ALLOYED HOT-DIP GALVANIZED STEEL SHEET
Document Type and Number:
WIPO Patent Application WO/2013/047810
Kind Code:
A1
Abstract:
A high-strength alloyed hot-dip galvanized steel sheet obtained by subjecting the surface of a high-strength steel sheet to alloyed hot-dip galvanization, and formed from a steel sheet containing, in mass%, main components, and containing at least 40 vol% bainite and/or martensite, 8-60 vol% retained austenite, and less than 40 vol% ferrite, with the remainder comprising unavoidable structures. In the alloyed hot-dip galvanized steel sheet, the total thickness of the Γ1 layer and the Γ layer (Tγ1+Tγ) is 2 µm or less in the alloy layers formed by hot-dip galvanization, and the Γ1 phase/Γ phase thickness ratio (Tγ1/Tγ) is 1 or less. A tensile strength of 980 MPa or above can be easily imparted to the alloyed hot-dip galvanized steel sheet. The alloyed hot-dip galvanized steel sheet has excellent coating adherence, and coating separation during machining can be suppressed.

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Inventors:
YAMANAKA SHINTARO (JP)
FUJITA SOSHI (JP)
SATO KOICHI (JP)
Application Number:
PCT/JP2012/075198
Publication Date:
April 04, 2013
Filing Date:
September 28, 2012
Export Citation:
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Assignee:
NIPPON STEEL & SUMITOMO METAL CORP (JP)
International Classes:
C23C2/06; B21B3/00; C21D9/46; C22C38/00; C22C38/06; C22C38/58; C23C2/02; C23C2/28
Foreign References:
JP2007211279A2007-08-23
JP2007231373A2007-09-13
JP2008127637A2008-06-05
JP2011094215A2011-05-12
JP2002173756A2002-06-21
JP2005133201A2005-05-26
JP2002030403A2002-01-31
JPS6468456A1989-03-14
JPS59219473A1984-12-10
Other References:
HONG, M.N.; SAKA, H.: "Proc. 4th Intern. Conf. On Zn and Zn Alloy Coated Steel Sheet", GALVATECH '98, 1998, pages 248
KATO, T.; HONG, M.H.; NUNOME, K.; SASAKI, K.; KURODA, K.; SAKA, H., THIN SOLID FILMS, vol. 319, 1998, pages 132
Attorney, Agent or Firm:
AOKI, Atsushi et al. (JP)
Aoki 篤 (JP)
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