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See Chinese contents: GB/T 33228-2016 GB/T 33228-2016: Aluminum alloy extruded tubes for high-frequency electric transformer
This Standard specifies the requirements, test methods, inspection rules and marking, packaging, transportation, storage, quality certificate and order form (or contract) contents of aluminum alloy extruded tubes for high-frequency electric transformer. This Standard applies to aluminum alloy round tubes (hereinafter referred to as tubes) which are produced by divergent die extrusion in the fields of transmission, transformation and distribution.
