碳 C :0.20~0.25硅 Si :≤0.50锰 Mn:0.50~1.00硫 S :≤0.030磷 P :≤0.035铬 Cr:11.00~13.00镍 Ni:0.50~1.00钒 V :0.20~0.40钼 Mo:0.75~1.25钨 W :0.70~1.25