Analysis of ductile casting manufacturing process

2022-07-08

(1) Strict requirements on the chemical composition, The carbon and silicon content of raw iron liquid is higher than that of gray cast iron, Reduce manganese in ductile iron, Phosphorus, sulfur content (2) iron oven temperature is higher than gray cast than iron, Than compensation sphere change, Loss of iron liquid temperature during gestation treatment (3) Bulping treatment, That is, add ball agent to iron liquid (4) for gestation treatment (5) ductile casting fluidity, With a large contraction, Therefore, a higher pouring temperature and a larger pouring system size are required, Multi-application mouth, chiller, Using the sequential solidification principle (VI) Heat treatment of ductile iron as a bearing requires higher hardness, The cast iron part is often quenched and tempered at low temperature.The process is: various castings are heated to a temperature of 860-900℃, and the original matrix is all oltenitic and then cooled in oil or molten salt to achieve quenching. After 250-350℃ heating and tempering, the original matrix is converted into tempering martensite and residual austenitic tissue, and the original spherical graphite shape remains unchanged.

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