STEEL FOR HIGH STRENGTH SUSPENSION SPRING HAVING EXCELLENT IMPACT PROPERTIES AND METHOD OF PRODUCING HIGH STRENGTH SUSPENSION SPRING BY USING THE SAME

摘要

The present invention is available coil current car , a leaf spring , a spring STEEL wire used in the torsion bars and stabilizer . relates to , and more particularly to a high deformation resistance , high fatigue strength and high-strength springs that ensure a method of manufacturing the steel toughness ; in the steel for the spring suspension of the present invention are by weight %, C: 0.4 ~ 0.6%, Si: 1.0 ~ 3.0%, Mn: 0.3 ~ 1.0%, Cr: 0.5 ~ 1.5%, Ni: 0.2 ~ 1%, Cu: 0.1 ~ 0.3%, O: 0.0015% or less , P: 0.01% or less, S: 0.01% or less , balance Fe and other inevitable impurities include , here V: 0.05 ~ 0.3% and / or Ti:. 0.01 to 0.1% , including further characterized in that said ; may be the case with the present invention, by using a steel material and the steel product for a suspension spring combination of high strength and high toughness to provide a method for producing a high strength , high toughness springs .