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See Chinese contents: GB/T 9439-2023 GB/T 9439-2023: Grey iron castings
This document stipulates the designations, production methods and chemical composition, technical requirements, specimen preparation, test methods, inspection rules and markings, quality certificates, protection, packaging, storage and transportation of gray iron casting. This document is applicable to ordinary gray iron castings, which are cast in sand molds or molds with thermal conductivity equivalent to that of sand molds. Gray iron castings which are cast in other molds can be used with reference to it.
