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A53 standard specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless.A53 standard specification covers seamless and welded black and hot-dipped galvanized steel pipe in NPS 1/8 to NPS 26.A53 standard main steel grade:A53 Gr. A,A53 Gr. B pipeline and so on.

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