高镍低铁：Ni 2.0% minFe 15-20%P 0.01% maxH20 35% max中镍中铁：Ni 1.5-1.6% Fe 35% minP 0.01% maxH20 35% max低镍高铁：Ni 0.9-1.1%Fe 49% minp 0.01% maxH2O 35% max