STAINLESS CLAD STEEL WITH EXCELLENT CORROSION RESISTANCE
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United States of America Patent
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May 14, 2015
app pub date -
Mar 5, 2013
filing date -
Mar 8, 2012
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Abstract
A stainless clad steel includes a stainless steel having Pitting Index of 35 or more as a cladding material, wherein the ratio of Cr concentration/Fe concentration in a passivation film portion of the above-described cladding material to Cr concentration/Fe concentration in a parent phase portion of the above-described cladding material is 1.20 or more and, in addition, the amount of precipitation of a σ (sigma) phase of the surface of the above-described cladding material is 2.0% or less on an area ratio basis.
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