| 摘要 |
PROBLEM TO BE SOLVED: To obtain a steel sheet excellent in rust generating-resistance and corrosion resistance as-nonpickled by specifying the chemical components of a 13Cr series stainless steel and the expanding ratio at the time of hot rolling and forming a scale layer with specified thickness or above and an Si-concentrated layer with specified thickness or above on the surface of the steel sheet. SOLUTION: As for a stainless steel having a compsn. contg., by weight, >=10% Cr and >=0.5% Si, the expanding ratio at the time of hot rolling from a slab to a steel strip is regulated to >=150, a scale layer with <=3μm thickness is formed on the surface of the steel strip, and also, an Si-concentrated layer with <=0.08μm thickness is formed on the boundary between the scale layer and the base alloy. Moreover, as for the rolling conditions other than the expanding ratio, the rolling is executed in such a manner that the slab heating temp. is regulated to 1000 to 1250 deg.C and the expanding ratio is regulated to >=150, and the rolling finishing temp. is regulated to 700 to 1100 deg.C and the coiling temp. is regulated to >=500 deg.C. In this way, the reduction of iron oxide in the scale into metallic iron can be prevented without increasing the scale thickness to improve its rust generating resistance.
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