The method of producing the spring with production method and its steel wire material of the steel wire material and that steel wire material for the spring of high intensity are superior in cold processability amp; the high tenacity which

摘要

Weight % with, C: 0.4 - 0.7%, Si: 1.5 - 3.5%, Mn: 0.3 - 1.0%, Cr: 0.01 - 1.5%, Ni: 0.01 - 1.0%, Cu: 0.01 - 1.0%, B: 0.005 - 0.02%, Al: 0.1% or less, O: 0.0020% or less, P: 0.02% or less, S: 0.02% or less, N: 0.02% or less, it possesses the constitution which includes remainder Fe and the other inevitable impurities, it possesses the organization inside ferrite and the pearlite are formed, it offers the steel wire material for the spring of high intensity and the high tenacity which are superior in the cold processability where old austenite grain size of internal organization is 8 millimicrons or less.