oil tempered spring steel wire Grade: 55CrSi, 60Si2Mn, 65Mn Dia: 6.0~16.0mm Standards: ASTM, BS, DIN, GB, JIS oil tempered and quenched spring steel wire Grade: 55CrSi, 60Si2Mn, 65Mn Dia: 6.0~16.0mm Standards: ASTM, BS, DIN, GB, JIS Advantage: 1. Marerial: We select good quality spring steel wire rod. ,mostly from BAO STEEL company2. Surface treatment: Advanced technology of shot blasting, 100% ...