K18:鎳基鑄造高溫合金，現(xiàn)牌號為K418,見GB/T 14992.化學(xué)成分要求(%):C:0.08-0.16,Cr:11.5-13.5,Ni:余量,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...