Title:
PLATED STEEL SHEET
Document Type and Number:
WIPO Patent Application WO/2017/073579
Kind Code:
A1
Abstract:
In the present invention, the average chemical composition of a plating layer (10) and an intermetallic compound layer (30) contains, in terms of mass%, 10-40% of Al, 0.05-4% of Si and 0-5% of Mg, with the remainder comprising Zn and impurities. The plating layer (10) is constituted from Al phases containing Zn in solid solution and Zn phases dispersed in the Al phases, and the plating layer (10) has a first structure (11) having an average chemical composition that contains, in terms of mass%, 25-50% of Al, 50-75% of Zn and less than 2% of impurities, and a eutectoid structure (14), which is constituted from Al phases and Zn phases and which has an average chemical composition that contains, in terms of mass%, 10-24% of Al, 76-90% of Zn and less than 2% of impurities. In a cross section of the plating layer (10), the areal proportion of the first structure (11) is 5-40% and the total areal proportion of the first structure (11) and the eutectoid structure (14) is 50% or more, the areal proportion of Zn phases (15), which are structures containing 90% or more of Zn, contained in the plating layer (10) is 25% or less, the total areal proportion of intermetallic compound phases contained in the plating layer (10) is 9% or less, and the thickness of an intermetallic compound layer (30) is 2 μm or less.
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Inventors:
MITSUNOBU TAKUYA (JP)
Application Number:
PCT/JP2016/081634
Publication Date:
May 04, 2017
Filing Date:
October 25, 2016
Export Citation:
Assignee:
NIPPON STEEL & SUMITOMO METAL CORP (JP)
International Classes:
C23C2/06; C22C18/04; C23C2/40
Domestic Patent References:
| WO2010150537A1 | 2010-12-29 |
Foreign References:
| JP2002206156A | 2002-07-26 | |||
| JP2003155549A | 2003-05-30 | |||
| JP2003268517A | 2003-09-25 | |||
| JP2004323974A | 2004-11-18 | |||
| US20090004400A1 | 2009-01-01 |
Other References:
See also references of EP 3369837A4
Attorney, Agent or Firm:
KOKUBUN, Takayoshi (JP)
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