HOT-DIP GALVANIZED STEEL SHEET AND PROCESS FOR PRODUCING SAME

Title:

HOT-DIP GALVANIZED STEEL SHEET AND PROCESS FOR PRODUCING SAME

Document Type and Number:

WIPO Patent Application WO/2013/047820

Kind Code:

A1

Abstract:

This hot-dip galvanized steel sheet comprises a steel sheet and a deposit layer formed on the surface of the steel sheet, wherein the steel sheet has a microstructure that contains 20-99 vol.% martensite and/or bainite, with the remaining structure comprising ferrite and below 8 vol.% retained austenite and/or up to 10 vol.% pearlite, the steel sheet has a tensile strength of 980 MPa or higher, and the deposit layer is a deposit layer formed by hot-dip galvanization which contains an oxide containing one or more of Si, Mn, and Al and further contains up to 15 mass% Fe, with the remainder comprising Zn, Al, and incidental impurities. When a sheet-thickness-direction cross-section which includes the steel sheet and the deposit layer formed by hot-dip galvanization is examined, the proportion of projected area is 10-90%.

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Inventors:

AZUMA MASAFUMI (JP)
WAKABAYASHI CHISATO (JP)
NOZAKI TAKAYUKI (JP)
TAKAHASHI MANABU (JP)
FUJITA NOBUHIRO (JP)

Application Number:

PCT/JP2012/075215

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; C21D9/46; C22C18/00; C22C38/00; C22C38/06; C22C38/58; C23C2/02; C23C2/28; C23C2/40

Domestic Patent References:

WO2011065591A1

2011-06-03

Foreign References:

JP2007270176A	2007-10-18
JP2010106323A	2010-05-13
JP2009209451A	2009-09-17
JP2002018531A	2002-01-22
JPH11293383A	1999-10-26
JPS59219473A	1984-12-10

Other References:

"New developments in delayed fracture clarification, The Iron and Steel Institute of Japan", January 1997
YAMAZAKI ET AL.: "CAMP-ISIJ", vol. 5, October 1992, THE IRON AND STEEL INSTITUTE OF JAPAN, pages: 1839 - 1842
MATERIA, JAPAN INSTITUTE OF METALS BULLETIN, vol. 44, no. 3, 2005, pages 254 - 256
See also references of EP 2762600A4

Attorney, Agent or Firm:

SHIGA Masatake et al. (JP)
Masatake Shiga (JP)

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