Material and its maximum operating temperature?
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A valve that had passed pressure testing was newly installed in the residue oil system operating at 380 degrees Celsius. Upon commissioning, severe leakage occurred at the middle flange and could not be sealed; upon disassembly, it was found that a PTFE gasket was being used for that flange, so a metal gasket was substituted, which allowed the system to resume operation. Are there any standards for the material and its maximum operating temperature? For example, what is the maximum operating temperature for materials such as 2Cr13 and 3Cr13?
There are certainly standards for materials and their maximum operating temperatures.
PTFE gaskets can withstand a maximum temperature of 200 degrees. Occasionally, they can still be used at 250 degrees, but at 380 degrees, problems are inevitable
As mentioned above, PTFE gaskets are generally used for temperatures below 200 degrees; those produced abroad can withstand higher temperatures. For metal materials, you can check the allowable stress; by looking at the allowable stress at different temperatures, you can determine whether it can be used in the application you need.