PWHT of Low Carbon Steel above 1330F; how detrimental?
PWHT of Low Carbon Steel above 1330F; how detrimental?
(OP)
To prevent stress corrosion cracks in a weld we do a post-weld heat treatment. The material is a simple low carbon (approx 0.2% C) and low alloy steel. Due to the big size and complicated shape of the object we can't heat the weld itself. To make sure that the weld itself sees a temperature high enough to make sure any residual stress is relieved we have to heat up some areas of the object to a temperature very close to the Ac1 temperature (1330F/723C). There is a risk that in some spots we might exceed the temperature.
Question: If we exceed the temperaure, besides that the material will loose some of it's strength, are there any other detrimental effects to be considered or expected?
Note: We'll cool down the material slow enough to make sure we have no hardening efect through the austenit>ferrit conversion.
Thanks a lot everybody for any help or tips. :)
Question: If we exceed the temperaure, besides that the material will loose some of it's strength, are there any other detrimental effects to be considered or expected?
Note: We'll cool down the material slow enough to make sure we have no hardening efect through the austenit>ferrit conversion.
Thanks a lot everybody for any help or tips. :)





RE: PWHT of Low Carbon Steel above 1330F; how detrimental?
RE: PWHT of Low Carbon Steel above 1330F; how detrimental?
RE: PWHT of Low Carbon Steel above 1330F; how detrimental?
This is sufficient for a welded low carbon/alloy steel combination and will reduce the possibility of transformation above AC1.
If alloy steel has a low carbon content, post weld heat treatment may not be necessary.
Good Luck
RE: PWHT of Low Carbon Steel above 1330F; how detrimental?
RE: PWHT of Low Carbon Steel above 1330F; how detrimental?
Thanks for the tips everybody!