| 摘要 |
PROBLEM TO BE SOLVED: To produce a wire rope having respectively specified average crystalline grain size in cross-sectional direction and tensile strength by specifying the composition and manufacturing method of a stainless steel wire rope, respectively. SOLUTION: A wire rod, in as-hot-rolled state or after heat treatment, having a composition which consists of, by weight, <=0.12% C, 0.1-1.5% Si, >1.5-8.0% Mn, <=0.03% P, <=0.01% S, 3.5-7.5% Ni, 20.0-28.0% Cr, 0.1-3.0% Mo, and the balance Fe and in which the value of G1, represented by the equation, G1=0.67 Ni+20C+0.34Mn+0.4Cr+0.4Mo+0.6Si+3, is regulated to -1 to 2(%) is used. This wire rod is subjected to wire drawing at >=50% total reduction of area, to heat treatment at 1,000-1,150 deg.C, successively to wire drawing at 80-95% reduction of area, and then to stranding. By this method, the wire rope, having <=5μaverage crystalline grain side in cross-sectional direction and >=1,500N/mm<2> tensile strength, can be obtained.
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