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See Chinese contents: GB/T 4437.2-2017 GB/T 4437.2-2017: Aluminium and aluminium alloy extruded tubes -- Part 2: Seam tubes
This Part of GB/T 4437 specifies the requirements, test methods, inspection rules, mark, package, transportation, storage, quality certificate and ordering list (or contract) contents of aluminum and aluminum alloy extruded tubes produced by split-flow combination mold or bride combination mold. This Part is applicable to the aluminum and aluminum alloy seam circular, rectangular, regular polygon tubes (hereinafter referred to as tube) produced by split-flow combination mold or bridge combination mold.
