Industry Standards for Ductile Iron Castings

The production and inspection of ductile iron castings must adhere to rigorous standards and specifications. Regarding chemical composition, for instance, the content of elements such as carbon, silicon, and manganese must be strictly controlled to ensure optimal mechanical and machining properties. In terms of mechanical performance, the castings are required to meet specific benchmarks for tensile strength, yield strength, and elongation. Inspection protocols typically employ non-destructive testing methods-such as ultrasonic and magnetic particle testing-to verify internal quality.
These standards define key parameters for ductile iron castings, including material chemical composition, mechanical properties, and microstructure; they cover production processes, inspection rules, and acceptance criteria, while also introducing new grades and elongation requirements. The technical content incorporates modifications based on the international standard ISO 1083:2018 (*Spheroidal graphite cast irons - Classification*), with classification codes corresponding to the Chinese standard J31 and the international standard 77.140.80.