This standard specifies the types and dimensions of gray cast iron, malleable cast iron and ductile cast iron pipe blank flanges whose nominal pressure, PN, is 0.25, 0.6, 1.0, 1.6, 2.0, 2.5, 4.0 or 5.0MPa.
2 Normative References
The following normative documents contain provisions which, through reference in this standard, constitute provisions of this standard. At time of publication, the editions indicated were valid. All standards will be revised and all parties coming to an agreement according to this standard are encouraged to study whether the latest editions of the following standards are applicable.
GB/T 17241.2-1998 The following standards are cited：
