Title:
HIGH-STRENGTH HOT-DIP GALVANIZED STEEL SHEET AND PROCESS FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2013/047808
Kind Code:
A1
Abstract:
A high-strength hot-dip galvanized steel sheet containing a main component, the steel sheet having at least 40 wt% of ferrite as a main phase in terms of the volumetric ratio, and 8-60% inclusive of residual austenite, the remaining structure comprising one or more of bainite, martensite, or pearlite. Austenite particles within a range where the average residual stress (σR) thereof satisfies the expression -400MPa≤σR≤200MPa (formula (1)) are present in an amount of 50% or more in the hot-dip galvanized steel sheet. The surface of the steel sheet has a hot-dip galvanized layer containing less than 7 wt% of Fe, the remainder comprising Zn, Al and inevitable impurities.
Inventors:
SATO KOICHI (JP)
YAMANAKA SHINTARO (JP)
FUJITA SOSHI (JP)
YAMANAKA SHINTARO (JP)
FUJITA SOSHI (JP)
Application Number:
PCT/JP2012/075194
Publication Date:
April 04, 2013
Filing Date:
September 28, 2012
Export Citation:
Assignee:
NIPPON STEEL & SUMITOMO METAL CORP (JP)
International Classes:
C22C38/00; B21B3/00; C21D9/46; C22C18/04; C22C38/06; C22C38/58; C23C2/02; C23C2/06; C23C2/28
Domestic Patent References:
| WO2011065591A1 | 2011-06-03 |
Foreign References:
| JP2008189985A | 2008-08-21 | |||
| JP2006265671A | 2006-10-05 | |||
| JP2003306746A | 2003-10-31 | |||
| JPH0488125A | 1992-03-23 | |||
| JP2005133201A | 2005-05-26 | |||
| JP2002030403A | 2002-01-31 | |||
| JPS59219473A | 1984-12-10 |
Other References:
See also references of EP 2762579A4
Attorney, Agent or Firm:
AOKI, Atsushi et al. (JP)
Aoki 篤 (JP)
Aoki 篤 (JP)
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Claims: