SURFACE-TREATED STAINLESS STEEL EXCELLENT IN DESIGN CHARACTERISTICS AND CORROSION RESISTANCE AND METHOD FOR PRODUCING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a surface-treated stainless steel whose corrosion resistance can be markedly improved by electropolishing its surface without deteriorating its design.

SOLUTION: The stainless steel excellent in design characteristics and corrosion resistance is obtained by conducting a surface treatment on the surface of an austenitic stainless steel from which scale has been removed after rolling and solution heat treatment. Its surface achieves a surface undulation having a roughness Ra of≥1.8μm formed by design characteristics improvement treatment and acquires a passive film having a markedly high Cr content compared to a base metal by an electropolishing treatment and a passivation treatment. The area of Cu-enriched regions observed in pitting parts after a pitting potential measurement test is 0.1μm2per 1.0 cm2measured area.

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