Reference data for stainless steel flange production

Skills requirements for stainless steel flanges:

First, the grade of stainless steel flange and its skill requirements should meet the corresponding requirements of JB4726-4728.

1. Grade I forgings are allowed for carbon steel and austenitic stainless steel forgings with a nominal pressure PN of 0.25MP-1.0MPa.

2. Except as specified below, forgings with a nominal pressure PN of 1.6 MPa to 6.3 MPa shall meet the requirements of Grade II or above forgings.

3. Those who meet one of the following conditions shall meet the requirements of III and forgings:

         (1) Forgings with flanges of nominal pressure PN≥10.0MPa;

        (2) Forged chrome molybdenum steel with nominal pressure PN4.0MPa;

        (3) Ferritic steel forgings with nominal pressure PN1.6MPa and working temperature ≤ -20 degrees Celsius.