What are the advantages of gray iron castings in ductile iron casting factories that are worth pursuing?
1. High temperature gray iron castings are annealed for castings with more eutectic structures in the carburized matrix to reduce hardness and improve machinability.
2. Low temperature annealing of gray iron castings requires that the hardness of gray iron castings be too high, and there is no eutectic carburized iron in the matrix structure, which requires gray iron castings to have high plasticity and toughness.
3. Stress relief annealing is used to reduce residual stress during casting, welding, and machining processes. Thus ensuring the dimensional stability of gray iron castings.
4. Fully austenitized fine fire is used for gray iron with excessive ferrite and low hardness to improve the strength, hardness, and wear resistance of gray iron castings.
5. Local austenitizing fine fire is used for gray iron castings with relatively uniform matrix structure, constant strength and toughness.
6. Through austenitizing quenching and tempering at different tempering temperatures, the strength, hardness, and wear resistance of gray iron castings have been improved.
7. Complete austenitization and isothermal quenching are used to improve the comprehensive performance of gray iron castings.
8. Surface quenching is used to improve the strength, surface strength, and wear resistance of gray iron castings.
9. Chemical heat treatment is the process of obtaining special physical, chemical, and mechanical properties on the surface of gray iron castings.