A.W6Mo5Cr4V2A1 B.5W2Cr4V2 C.40Cr D.42CrMo
A.9CrSi B.Cr12MoV C.W18Cr4V D.40Cr
A.35CrMnSi B.5CrMnMo C.5CrNiMo D.3Cr2W8V