铝(Al)≤0.02,铁(Fe)≤0.1,镍(Ni)2.4~3.4,硅(Si)0.6~1.1,锡(Sn)≤0.1,铅(Pb)≤0.15,铜(Cu)余量,锌(Zn)≤0.2,锰(Mn)0.1~0.4,杂质总和%≤0.5