Material:403,201,202,304,304HC,304L,310S,316,316L,317L Surface:bright,polished,black Certificate:ISO,SGS Origin:China Material Name: 61SiCr7(1.7108) spring steel executive standard:EN 10089-20021Characteristics and application scope:Is widely used silicon manganese spring steel, strength, elasticity and its quench-hardening ability is 55 Si2Mn higher. Suitable for railway vehicle and auto tractor ...