合金工具钢,相当于我国的Cr5Mo1V,就是引进美国的A2钢的中国牌号,多用于冷作模具的制造。C:0.95-1.05Si:<=0.5Mn:<=1S:<=0.03P:<=0.03Ni<=0.25(允许残余量)Cu<=0.30(允许残余量)Cr:4.75-5.5V:0.15-0.5Mo:0.9-1.4退火态硬度:HRC60