Patent ID: 6338763
Filing Date: 2002-01-15
Classification: C21D,C22C,Y10S

Abstract:
A steel wire for high strength springs comprising as steel components, in weight percent,Câ€ƒâ€‚0.4-0.7%Siâ€ƒâ€‚1.2-2.5%Mnâ€ƒâ€‚0.1-0.42%Crâ€ƒâ€‚0.4-2.0%Al0.0001-0.005% andVâ€‚0.050-0.4%,Mn + V being not more than 0.6%,being limited toPnot more than 0.015% andSnot more than 0.015%,the balance being Fe and unavoidable impurities, the steel wire having no nonmetallic inclusions of a size greater than 15 &mgr;m, a tensile strength of not less than 1960 MPa, and a yield ration (&sgr;0.2/&sgr;B) of not less than 0.8 and not greater than 0.9 or a yield ration (&sgr;0.2/&sgr;B) of not less than 0.8 and an amount of residual austenite of not greater than 6%.