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There are many different heat treatment methods for ductile iron, and the choice depends on the specific requirements and application scenarios of the casting. These heat treatment methods can effectively improve the performance of the casting and increase its service life and reliability.

Aging treatment of machine tool castings is an important part of the casting process. It aims to eliminate residual stress inside the castings through a series of measures, stabilize their size and organizational structure, and thus improve the mechanical properties and service life of the castings.

There are many reasons for the surface depression of ductile iron castings, which require comprehensive analysis and control from multiple aspects such as pouring temperature, alloy element content, mold design, pouring speed, cooling time, raw iron liquid composition and casting structure.