SA-335 Grade P12 and P22
SA-335 Grade P12 and P22
(OP)
hi all,
what is the main practical difference between these two alloys:
1- SA-335 Grade P12 (USA / ASME) Cr(0.8-1.2) Mo(0.44-0.65)
2- SA-335 Grade P22 (USA / ASME) Cr(1.9-2.6) Mo(0.8-1.1)
Is it possible to substitute the second item with first one?
We are going to use them in boilers?
thanks a million
what is the main practical difference between these two alloys:
1- SA-335 Grade P12 (USA / ASME) Cr(0.8-1.2) Mo(0.44-0.65)
2- SA-335 Grade P22 (USA / ASME) Cr(1.9-2.6) Mo(0.8-1.1)
Is it possible to substitute the second item with first one?
We are going to use them in boilers?
thanks a million





RE: SA-335 Grade P12 and P22
Grade P22 has generally, at high temperature, an higher allowable stress compare with P12. In general you cannot simply substitute a pipe in grade P22 with an identical one in grade P12.
It's maily depending from the design temperature.
RE: SA-335 Grade P12 and P22
If you are buildig an enire boiler, there may be cost savings by substituting T23 for all t22, t11, t12 and other light alloy tubes, as one scheduled furnace run by the mill for a single large T23 order may be cheaper than the smaller mill runs for the other alloys.
RE: SA-335 Grade P12 and P22
RE: SA-335 Grade P12 and P22