Application temperature limits of SS 904L
Application temperature limits of SS 904L
(OP)
Dear forum members,
I was surprised that the SA-312 grade 904L pipe has an application limit of 371°C (700°F) for ASME VIII-1, while in ASME B31.3 the limit drops to 260°C (500°F). Does anyone know the reason for this big difference?
I was surprised that the SA-312 grade 904L pipe has an application limit of 371°C (700°F) for ASME VIII-1, while in ASME B31.3 the limit drops to 260°C (500°F). Does anyone know the reason for this big difference?





RE: Application temperature limits of SS 904L
RE: Application temperature limits of SS 904L
When the phases form they not only greatly lower corrosion resistance but the toughness and ductility drop. The properties while hot are usually fine, but when the material cools it can be very brittle.
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P.E. Metallurgy, Plymouth Tube
RE: Application temperature limits of SS 904L
To complete the normative panorama, one more data: "EN 10216-5 Seamless steel tubes for pressure purposes" establishes a limit for intergranular corrosion of 400ºC for 1.4539, which is the European equivalent of 904L.
Summarizing:
ASME VIII-1, vessels: 371°C
ASME B31.2, piping: 260°C
EN 10216-5, vessels & piping: 400°C
Another thing is the compatibility of the 904L with the product content, at the design temperature finally chosen. That is the responsibility of the owner and his engineering.
RE: Application temperature limits of SS 904L
There are some good data sheets out there from producers.
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P.E. Metallurgy, Plymouth Tube
RE: Application temperature limits of SS 904L