The steel null for the high intensity high pure spring which C is superior in fatigue property and

摘要

PROBLEM TO BE SOLVED: To provide a high strength high purity spring steel excellent in both of fatigue characteristics and coiling properties.;SOLUTION: The high strength, high purity spring steel excellent in fatigue characteristics and coiling properties comprises (in terms of mass) 0.5 to 0.8% C, 1 to 3% Si, 0.1 to 1% Mn, 0.5 to 3% Cr, 0.05 to 0.7% Ni, ≤0.02% S excluding 0%, and 0.1 to 50 ppm Ca (on a mass basis), and the balance Fe and inevitable impurities. The spring steel may further contain ≤0.5% V excluding 0%, ≤0.1 % Nb excluding 0%, ≤0.1% Ti excluding 0%, ≤0.5 % Mo excluding 0% or the like.;COPYRIGHT: (C)2005,JPO&NCIPI