| 摘要 |
PROBLEM TO BE SOLVED: To produce a surface-modified martensitic stainless steel for structures such as buildings, building materials or the like excellent in surface hardness, corrosion resistance and toughness. SOLUTION: This martensitic stainless steel is the one in which the compsn. of the matrix is composed of, by weight, 0.05 to 0.40% C, <=0.12% N, 12.0 to 16.0% Cr, 0.1%<=C+N<=0.40%, and the balance substantial Fe with inevitable impurities. In this case, the grain size in the surface layer is regulated to about 30 to 100μm, the concn. of N in the surface layer is regulated to 0.2 to 0.8 wt.%, and the content of carbon nitride in the surface layer is regulated to <=0.7 wt.%.
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