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See Chinese contents: GB/T 38977-2020 GB/T 38977-2020: Nanometer grain cemented carbide rod
This Standard specifies the classification, technical requirements, test methods, inspection rules, marking, packaging, transportation, storage, quality certificate and order sheet (or contract) content of nanometer grain cemented carbide rod. This Standard is applicable to nanometer grain cemented carbide rod, in which, the average grain size of wolfram carbide (WC) in cemented carbide is not greater than 200 nm.
