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Title:
GALVANNEALED STEEL SHEET AND PROCESS FOR PRODUCTION THEREOF
Document Type and Number:
WIPO Patent Application WO/2010/089910
Kind Code:
A1
Abstract:
A galvannealed steel sheet comprising a steel sheet, a galvannealed layer, and an Mn-P oxide layer, wherein the steel sheet has a composition containing C, Si, Mn, P and Al with the balance being Fe and unavoidable impurities.  Further, in the X-ray diffraction of the Zn-Fe alloy phase in the galvannealed layer, the value obtained by dividing the diffraction intensity [Γ(2.59Ǻ)] of Γ phase having an interplanar spacing (d) of 2.59Ǻ by the diffraction intensity [δ1(2.13Ǻ)]of δ1 phase having an interplanar spacing (d) of 2.13Ǻ is 0.1 or below, while the value obtained by dividing the diffraction intensity [ζ(1.26Ǻ)] of ζ phase having an interplanar spacing (d) of 1.26Ǻ by the diffraction intensity [δ1(2.13Ǻ)]of δ1 phase having an interplanar spacing (d) of 2.13Ǻ is 0.1 to 0.4.  The Mn-P oxide layer covers the surface of the galvannealed layer in an amount of Mn falling within the range of 5 to 100mg/m2 and in an amount of P falling within the range of 3 to 500mg/m2.

Inventors:
KUROSAKI MASAO (JP)
MAKI JUN (JP)
TANAKA HIROYUKI (JP)
YAMANAKA SHINTAROH (JP)
Application Number:
PCT/JP2009/062538
Publication Date:
August 12, 2010
Filing Date:
July 09, 2009
Export Citation:
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Assignee:
NIPPON STEEL CORP (JP)
KUROSAKI MASAO (JP)
MAKI JUN (JP)
TANAKA HIROYUKI (JP)
YAMANAKA SHINTAROH (JP)
International Classes:
C23C2/06; C23C28/00
Foreign References:
JP2002294421A2002-10-09
JPH10306360A1998-11-17
JPH0741925A1995-02-10
JPH03249182A1991-11-07
JPH08296065A1996-11-12
JP2009023603A2009-02-05
JP2009022920A2009-02-05
JP2004169160A2004-06-17
JPH0688187A1994-03-29
JPH09165662A1997-06-24
JP2007013190A2007-01-18
JP2005054199A2005-03-03
JP2005048198A2005-02-24
JPS5360332A1978-05-30
JPH03191093A1991-08-21
JPH03249182A1991-11-07
Other References:
See also references of EP 2395128A4
Attorney, Agent or Firm:
SHIGA Masatake et al. (JP)
Masatake Shiga (JP)
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