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See Chinese contents: YB/T 4164-2007 YB/T 4164-2007: Double wall copper-brazed steel tubing
This Standard specifies the size, shape, weight, technical requirements, test methods, inspection rules, packaging, marks and quality certificate of double wall copper-brazed steel tubing. This Standard is applicable to the double wall copper-brazed steel tubing that uses copper as brazing material used to make brake tubing, fuel tubing, lubricating oil tubing, heating or coolers and other engineering pipelines in automobile, refrigeration, electric heating, electrical appliances and other industries.
