| 摘要 |
<p>PROBLEM TO BE SOLVED: To effectively produce an antibacterial action by Ag and to maintain highly stable antibacterial characteristic over a long period by rolling a steel strip containing specific amounts of Ag, holding it at a temperature in a specific region, and subjecting Ag phases to spheroidizing treatment. SOLUTION: As a stainless steel to be the object, ferritic, austenitic, martensitic, dual-phase stainless steels, etc., are exemplified, without restrictions on the kind of steels so far as 0.01-1 wt.% Ag is contained. The spheroidizing of Ag phases is accelerated by heat treating the stainless steel strip at a temperature not lower than the melting point of Ag. Because Ag in the steel is present in the form of compounds or solid solutions of C, S, Si, Mn, O, Mg, Al, Zn, etc., these Ag phases are ordinarily melted by heating and holding at 900-1,300 deg.C and spheroidized. Accordingly, heat treatment at >=900 deg.C is necessary to spheroidize the Ag phases; spheroidizing becomes more accelerated the higher the temperature rises, but this effect reaches saturation if the temperature exceeds 1,300 deg.C.</p> |
