K18：镍基铸造高温合金,现牌号为K418,见GB/T 14992.化学成分规定(%)：C:0.08-0.16,Cr:11.5-13.5,Ni:容量,Mo:3.8-4.8,Al:5.5-6.4,Ti:0.5-1.0,Fe≤1.0,Nb:1.8-2.5,B:0.008-0.020,Mn≤0.5,Si≤0.5,P≤0.015,S≤0.01....