Investment steel Impeller casting 1.Material: ASTM A743,grade CN7M 2.Used in pump industry ... ASTM A743, grade CN7M, CF8M,CF8,304L,316L,430F,430,440A.2)Process:Investment casting, silicasol casting or lost wax casting,water glass casting ... and sand casting;3)Standard:ASTM,JIS,DIN,BS;4)Finish:Machining,Welding, ...