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See Chinese contents: GB/T 21833.1-2020 GB/T 21833.1-2020: Seamless austenitic-ferritic (duplex) stainless steel tubes and pipes -- Part 1: Tubes for heat exchanger
This Part of GB/T 21833 specifies the order content, dimensions, shapes, masses, technical requirements, test methods, inspection rules, packing, marking, and quality certification of seamless austenitic-ferritic (duplex) stainless steel tubes and pipes for heat exchanger.
