Ductile Iron Manhole Cover-Factory Direct Sales-Quality Assurance

The production of ductile iron manhole covers strictly requires chemical composition. The carbon and silicon content of the original molten iron is higher than that of gray cast iron, which reduces the manganese, phosphorus and sulfur content in ductile iron
The temperature ratio of the secondary iron molten furnace Gray cast iron is higher to compensate for spheroidization and the loss of molten iron temperature during inoculation
3. Perform spheroidizing treatment, that is, add nodularizing agent to the molten iron
4. Add inoculant for inoculation
/> Ductile iron has poor fluidity and large shrinkage, so it requires a higher pouring temperature and a larger pouring system size. Reasonable use of risers and cold irons, and the principle of sequential solidification
6. Heat treatment