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HOT ROLLED WIRE MATERIAL EXCELLENT IN COLD FORGING PROPERTY AFTER SPHEROIDIZING TREATMENT, SPHEROIDIZING-ANNEALED STEEL WIRE HAVING EXCELLENT COLD FORGING PROPERTY, AND METHOD FOR PRODUCTION THEREOF
HOT ROLLED WIRE MATERIAL EXCELLENT IN COLD FORGING PROPERTY AFTER SPHEROIDIZING TREATMENT, SPHEROIDIZING-ANNEALED STEEL WIRE HAVING EXCELLENT COLD FORGING PROPERTY, AND METHOD FOR PRODUCTION THEREOF
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机译：优质化处理后的冷锻性能中的热轧线材性能优异，优质化处理后的热轧退火金属线材及其生产方法
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摘要
A hot rolled wire material which comprises 0.005 to 0.6 mass % of C, and has a structure wherein pseudo-pearlite, bainite and ferrite account for 10 vol % or more, 75 vol % or less and 60 vol % or less, respectively, and the relationship that the sum of (pseudo-pearlite + bainite + ferrite) ≥ 90 vol % is satisfied. A method for producing the above hot rolled wire material which comprises rolling a specific steel, followed by winding up at 750 to 1000˚C, cooling the steel from an upper limit temperature of 750 to 1000˚C to a lower limit temperature of 400 to 550˚C at a cooling rate of 20˚C/sec or higher, holding the steel for 20 sec or longer at 400 to 550˚C, and then cooling the steel. A steel wire comprises 0.005 to 0.6 mass % of C, and has a structure wherein the distances between cementite particles have a value of (standard deviation/average) of 0.50 or less. A method for producing the steel wire includes subjecting the above hot rolled wire material to spheroidizing annealing.
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