HIGH STRENGTH STEEL WIRE HAVING EXCELLENT DELAYED FRACTURE RESISTANCE AND EXCELLENT FORGING PROPERTY AND MANUFACTURING METHOD THEREFOR

摘要

PROBLEM TO BE SOLVED: To provide a high strength steel wire having excellent delayed fracture resistance and excellent forging property though having ≥1,200 N/mm2 tensile strength, and a useful method of manufacturing the high strength steel wire.;SOLUTION: The steel wire is composed of a steel containing 0.7-1.2% C and has a bainite structure having ≥80% area ratio and the tensile strength of ≥1,200 N/mm2 and excellent delayed fracture resistance are attained by strongly drawing a steel wire.;COPYRIGHT: (C)2002,JPO