The product level and technical requirements of the plate flange
The product level and technical requirements of the plate flange shall meet the requirements of the JB4726-4728. The carbon steel or austenitic stainless steel forgings of the nominal pressure at 0.25MP-1.0MPa are allowed to be made with grade I forgings. The forgings between the nominal pressure and 1.6MPa-6.3MPa shall be in accordance with the standard requirements of the grade II or more than grade II. For the plate flange nominal pressure of not less than 10.0MPa in forging, nominal pressure more than 4.0MPa chrome molybdenum steel forgings, nominal pressure more than 1.6MPa and less than -20 degrees Celsius temperature of ferrite products of steel forgings, the ASME B16.9 304 Stainless Steel Plate Flange must comply with the relevant requirements of grade III forgings.
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