Casting Technology of High-nickel Ductile Iron Exhaust Pipe
The casting process of high-nickel ductile iron exhaust pipe is summarized,and the saturation degree,which effects the spheroidization rate and mechanical properties of high-nickel austenite ductile cast iron,is discussed.When saturation A reaches up to 4.9,a casting with a good quality of spheroidization can also be produced.Furthermore,the chunky graphite on hot spots of high-nickel austenite ductile iron casting is solved utilizing proportional solidification technology.The heat treatment process is verified to be reasonable when compared with that in a foreign company.The mechanical properties of castings manufactured is far above the ASTM specification and the tensile strength of all castings is above 400 MPa.