ASTM standard 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 ...