SPRING STEEL WIRE ROD HAVING EXCELLENT WIRE DRAWABILITY AND EXCELLENT FATIGUE CHARACTERISTICS AFTER WIRE DRAWING, AND SPRING STEEL WIRE HAVING EXCELLENT FATIGUE CHARACTERISTICS AND EXCELLENT SPRING FORMABILITY

摘要

Fresh (伸 線) workability and material steel wire for spring of the excellent excellent spring for steel wire rod, and fatigue characteristics, and spring formability fatigue characteristics after fresh present invention, C: more than 0.50% to less than 0.70%, Si: 1.0 to 2.5%, Mn: 0.50 to 1.50%, Cr: (including 0%) 0.5% or less, B: to 0.020% or less (0%: 0.0010 to 0.0050%, N: (not including 0%) 0.005% or less, P not included), S: do not contain 0.020% or less (0%), Al: contains no more than 0.03% (0%), and O: do not contain 0.0020% or less (0%) were satisfied composed of a balance of iron and inevitable impurities, it is characterized in that the area ratio of pearlite structure in the entire tissue is not less than 85%.