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Title:
STAINLESS CLAD STEEL
Document Type and Number:
WIPO Patent Application WO/2013/132838
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide a stainless clad steel which exhibits excellent corrosion resistance, particularly excellent anti-rust properties, and an improvement in appearance due to changes in the color of the surface thereof, and with which the occurrence of outflow rust can be prevented. A stainless clad steel according to the present invention has, as a cladding material, stainless steel having a pitting index represented by formula (1) of at least 35, and is characterized in that: the ratio of Cr concentration (at%)/Fe concentration (at%) in the parent phase portion of the cladding material to Cr concentration (at%)/Fe concentration (at%) in the passivation film portion of the cladding material is at least 1.20; and the σ (sigma) phase deposition amount of the surface of the cladding material, expressed as an area ratio, is not more than 2.0%. Formula (1): pitting index = (Cr+3.3Mo+16N) (in formula (1), Cr, Mo, and N each represent the content (mass%) of the respective element, and if the element is not present, the corresponding number is 0).

Inventors:
YAZAWA YOSHIHIRO (JP)
TACHIBANA SHUNICHI (JP)
KISHI KEIICHIRO (JP)
KURONUMA YOTA (JP)
HOSHINO TOSHIYUKI (JP)
Application Number:
PCT/JP2013/001372
Publication Date:
September 12, 2013
Filing Date:
March 05, 2013
Export Citation:
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Assignee:
JFE STEEL CORP (JP)
International Classes:
C22C38/00; B32B15/01; C22C38/44
Foreign References:
JPH02285025A1990-11-22
JPS6418502A1989-01-23
JP2002003938A2002-01-09
JP2008274386A2008-11-13
JP2004137538A2004-05-13
JP2012149308A2012-08-09
JP2012148502A2012-08-09
JP4179133B22008-11-12
JP3409660B22003-05-26
JP3514889B22004-03-31
JP3401538B22003-04-28
Other References:
See also references of EP 2824206A4
Attorney, Agent or Firm:
KUMASAKA, Akira et al. (JP)
Akira Kumasaka (JP)
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