oil-quenching and tempering spring steel wire Grade:55CrSi,60Si2Mn,65Mn Dia:6.0~16.0mm Standards: ASTM, BS, DIN, GB, JIS oil-quenching and tempering spring steel wire Grade:55CrSi,60Si2Mn,65Mn Dia:6.0~16.0mmStandards: ASTM, BS, DIN, GB, JISAdvantage:1. Marerial: we select good quality spring steel wire rod.2. Surface treatment: advanced technology of shot blasting, 100% rubbed smooth, almost can ...