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See Chinese contents: GB/T 3191-2019 GB/T 3191-2019: Extrusion rods and bars of aluminium and aluminium alloys
This Standard specifies the requirements, test methods, inspection rules and marking, packaging, transportation, storage, quality certificate and order form (or contract) contents of extrusion rods and bars of aluminium and aluminium alloys. This Standard applies to extrusion round rods, square rods and hexagonal rods of aluminium and aluminium alloys.
