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See Chinese contents: GB/T 13401-2017 GB/T 13401-2017: Steel buttwelding pipe fittings -- Technical specification
This Standard specifies technical requirements such as order content, materials, manufacturing, heat treatment, inspection and testing, welding repair, surface protection and packaging, and product quality certificate for steel buttwelding pipe fittings. This Standard is applicable to pipe fittings specified in GB/T 12459. Other pipe fittings may refer to this Standard for use.
