STEEL WIRE ROD WITH EXCELLENT SPRING WORKABILITY FOR HIGH-STRENGTH SPRING PROCESS FOR MANUFACTURING SAME AND HIGH-STRENGTH SPRING

摘要

The steel wire rod for high strength steel of the present invention is a steel wire rod after hot rolling and has a predetermined chemical composition and has a pearlite area ratio of 90% or more. The average value Pave of the particle size numbers of the pearlite nodule and its standard deviation P are The following expressions (1) and (2) are satisfied.8.0 Pave 12.0 . (One)0.0 P (2)