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See Chinese contents: GB/T 4437.1-2015 GB/T 4437.1-2015: Aluminium and aluminium alloy extruded tubes -- Part 1: Seamless tubes
This Part of GB/T 4437 specifies requirements, test methods, inspection rules and marks, packaging, transportation, storage as well as quality certificate and order sheet (or contract) content for aluminium and aluminium alloy extruded seamless tubes. This Part is applicable to aluminium and aluminium alloy extruded seamless tubes for general industrial use.
