| 摘要 |
PROBLEM TO BE SOLVED: To provide a soft steel wire rod which has high strength even when the same steel is used in the wire rod after hot rolling. SOLUTION: The high strength soft steel wire rod consists of steel containing <0.3% C, <=1.0% Mn, <=1.0% Si, <=0.05% P and <=0.05% S, and has a bainitic structure of >=10% by area in the cross section of the wire rod after hot rolling. The wire rod is obtained by subjecting steel containing <0.3% C to hot rolling into a wire rod, thereafter, dipping the wire rod into a molten salt bath whose temperature is controlled to the range of at least >=700 deg.C to 300 to 600 deg.C, holding the wire rod for a fixed time, and thereafter, performing cooling thereto.
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