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See Chinese contents: GB/T 12771-2019 GB/T 12771-2019: Welded stainless steel pipes for fluid transport
This Standard stipulates the classification, code, order content, dimensions, appearance and weight, technical requirements, test methods, inspection rules, packaging, marking and quality certificate of welded stainless steel pipes for fluid transport. This Standard is applicable to welded stainless steel pipes for fluid transport.
