... Standards: ASTM, BS, DIN, GB, JIS 55CrSi Alloy steel oil tempered spring steel wire Grade: 55CrSi,60Si2Mn,65Mn Dia:1.6~16 ... BS, DIN, GB, JISAdvantage:1. Marerial: we select good quality spring steel wire rod.2. Surface treatment: advanced technology of shot blasting ... to produce many kinds of strength level for spring steel wire. Mechanical property of steel wire in static level and Moderate fatigue ...