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See Chinese contents: GB/T 17241.6-2008 GB/T 17241.6-2008: Integral cast iron flanges [including MODIFICATION 1]
This part of GB/T 17241 specifies the types and dimensions of the integral gray cast iron, malleable cast iron and ductile cast iron flanges with the nominal pressure of PN2.5, PN6, PN10, PN16, PN25, PN40, Class150, and Class300. This part is applicable to the design, manufacture and acceptance of DN10~DN4000 gray cast iron, malleable cast iron, and ductile cast iron integral cast iron flanges.
