A.H08MnMoA B.H10CrMoA C.H08CrMoVA D.H13CrMoA
A.0.02%------0.04% B.0.04%------0.08% C.0.08%------0.16% D.0.16%------0.32%
A.C、Cr B.Cr、Mo C.C、Mo D.Mo、V