20 Relationship between forgings and temperature
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Why, with a design pressure of 1.3 MPa and a design temperature of 400 degrees, can 16MNII be used while 20II cannot? What is the relationship between forgings and temperature?
Is this forging intended for use as a flange or for a forged cylinder? For flanges, you can refer to HG/T20592; there is a relationship between pressure and temperature, specifying the maximum allowable operating pressure at certain temperatures； However, for flanges rated at PN16, neither the 16MN nor the 20 forged variants can meet the requirement of 1.3 MPa at 400°C
Comparing strength differences with price differences, the overall economic efficiency is better
The recommended operating temperature for 20 alloy forgings is below 425, while the recommended operating temperature for 16Mn alloy forgings is below 400