①,Material:
a)pin through hardened Chemical composition limits (check analysis)%: C0.95~1.1,Si0.15~0.35,Mn0.25~0.4,P0.03max,S0.025max,Cr1.35~1.65。hardness：550 HV30 to 650 HV30
b)pin case hardened Chemical composition limits (check analysis)%: C0.06~0.13,Si0.1~0.4,Mn0.25~0.4,P0.025max,S0.05max or C0.15max,Si0.1max,Mn0.9~1.3,P0.07max,S0.15~0.35,Pb0.15~0.35, at the supplier's discretion. Surface hardened: 600 HV1 to 700 HV1；hardness at case depth 0.25 to 0.4 mm: 550 HV1 min.
c)Martensitic stainless steel C1 in accrodance with ISO 3506-1, hardened and tempered to a hardness of 460 HV30 to 560 HV30
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