Investment steel Impeller casting 1.Material: ASTM A743,grade CN7M 2.Used in pump industry 3.Inspection by Dye penetrant Investment steel Impeller castingProduct ... ,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 ... inquiry you may have for castings. ASTM A743 Investment Steel Impeller Casting