... 65Mn,77B,77A,82B,60Si2Mn,55SiCr,50CrVa 3.Used:spring Oil Tempered Spring Steel Wire 1. Size:0.5-16mm 2 ... spoke steel wire, umbrella frame steel wire, spring steel wire, mattress spring steel wire, free cutting steel wire, nipple steel ... customers' required 6. Main range of applications: Suspension spring for vechiles, Valve spring, Mechanical spring for important usage... 7. Coil weight:: As customers ...