... oil tempered spring steel wire Grade:55CrSi,60Si2Mn,65Mn Dia:6.0~16.0mm Standards: ASTM, BS, DIN, GB, JIS ASTM standard oil tempered 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 ... ~15501500~16501630~17801740~18903540 ASTM standard oil tempered spring steel wire