C碳:0.45-0.55
Si硅:0.71-1.00
Mn锰:0.15-0.45
P磷:0.005
S硫:0.005
Cr铬:0.90-1.20
Mo钼:-
Ni镍:-
V钒:0.10-0.20
W钨:1.70-2.20