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See Chinese contents: HG/T 20635-2009 HG/T 20635-2009: Specification for ion of steel pipe flanges, gaskets and bolting (Class designated)
This standard specifies the general rules for the selection of steel pipe flanges, gaskets and bolting (C1ass designated). This standard is applicable to the steel pipe flanges, gaskets and bolting specified in HG/T 20615- HG/T 20634.
