WIRE ROD FOR SPRING EXCELLENT IN WIRE DRAWING PROCESSABILITY AND FATIGUE PROPERTY AFTER WIRE DRAWING, AND STEEL WIRE FOR SPRING EXCELLENT IN FATIGUE PROPERTY AND SPRING PROCESSABILITY

摘要

PROBLEM TO BE SOLVED: To provide a wire rod for a spring excellent in wire drawing processability and fatigue property after wire drawing, and to provide a steel wire excellent in fatigue property and spring processability.;SOLUTION: This wire rod for the spring is characterized by containing: not lower than 0.50% and lower than 0.70% of C; 1.0 to 2.5% of Si; 0.50 to 1.50% of Mn; 0.5% or lower (including 0%) of Cr; 0.0010 to 0.0050% of B; 0.005% or lower (not including 0%) of N; 0.020% or lower (not including 0%) of P; 0.020% or lower (not including 0%) of S; 0.03% or lower (not including 0%) of Al, and 0.0020% or lower (not including 0%) of O. In the wire rod, a remaining part is composed of iron and inevitable impurities, and an area ratio of a pearlite organization occupied in an entire organization is not smaller than 85%.;COPYRIGHT: (C)2013,JPO&INPIT