Title:
HIGH-STRENGTH HOT-DIP GALVANIZED STEEL SHEET
Document Type and Number:
WIPO Patent Application WO/2013/047812
Kind Code:
A1
Abstract:
A high-strength hot-dip galvanized steel sheet which includes a steel sheet that comprises major components and that contains at least 40 vol.% the sum of bainite and martensite, 8-60 vol.% retained austenite, and less than 40 vol.% ferrite, with the remainder comprising an incidental structure. The hot-dip galvanized steel sheet has, at the interface between the deposit layer formed by hot-dip galvanization and the base steel sheet, an intermetallic compound constituted of Fe, Al, Zn, and incidental impurities and having an average thickness of 0.1-2 µm, the intermetallic compound having a crystal grain diameter of 0.01-1 µm. After the deposit layer formed by hot-dip galvanization was removed, the surface of the base steel sheet has an arithmetic average roughness Ra of 0.1-2.0 µm and gives a roughness curve in which the contour elements have an average length RSm of 5-300 µm. Thus, a high-strength hot-dip galvanized steel sheet which includes a high-strength steel sheet as the base and which has excellent formability that can inhibit cracking or breaking is provided.
Inventors:
YAMANAKA SHINTARO (JP)
FUJITA SOSHI (JP)
SATO KOICHI (JP)
FUJITA SOSHI (JP)
SATO KOICHI (JP)
Application Number:
PCT/JP2012/075203
Publication Date:
April 04, 2013
Filing Date:
September 28, 2012
Export Citation:
Assignee:
NIPPON STEEL & SUMITOMO METAL CORP (JP)
International Classes:
C23C2/06; B21B3/00; C21D9/46; C22C18/04; C22C38/00; C22C38/06; C22C38/58
Foreign References:
| JP2007211279A | 2007-08-23 | |||
| JP2007231373A | 2007-09-13 | |||
| JP2008127637A | 2008-06-05 | |||
| JP2006061953A | 2006-03-09 | |||
| JPH04211887A | 1992-08-03 | |||
| JP2010065273A | 2010-03-25 | |||
| JP2011017046A | 2011-01-27 | |||
| JPH10306360A | 1998-11-17 | |||
| JP2006097102A | 2006-04-13 | |||
| JPH0693402A | 1994-04-05 | |||
| JP2006307302A | 2006-11-09 | |||
| JP2000144362A | 2000-05-26 | |||
| JPS59219473A | 1984-12-10 |
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
See also references of EP 2762603A4
KATO, T.; HONG, M.H.; NUNOME, K.; SASAKI, K.; KURODA, K.; SAKA, H., THIN SOLID FILMS, vol. 319, 1998, pages 132
See also references of EP 2762603A4
Attorney, Agent or Firm:
AOKI, Atsushi et al. (JP)
Aoki 篤 (JP)
Aoki 篤 (JP)
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Claims:
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