alloy 800ht
alloy 800ht
(OP)
hi,
we have to weld some pipes in this material, with pwht , in my opinion with 875ºc 3 hours is good what do you think?
thaks
we have to weld some pipes in this material, with pwht , in my opinion with 875ºc 3 hours is good what do you think?
thaks





RE: alloy 800ht
RE: alloy 800ht
RE: alloy 800ht
RE: alloy 800ht
RE: alloy 800ht
I am going to correct myself here, per ASME Section VIII, Div 1, UNF-56, 1 (e)
for Incoloy 800,800H, 800HT, these alloys will be subject to PWHT if they are in service above 1000 deg F.
PWHT min 885 deg C for 1.5 hours for thickness up to 1".
If you meet the conditions above, it must be 885 deg C minimum.
Alos, for welding bellows (thin section material), the PWHT does NOT apply.
RE: alloy 800ht
thanks a lot
RE: alloy 800ht
If you review the technical data sheet on Alloy 800H/HT by Special Metals, post fabrication strain is either from cold work or from welding (residual stresses). Stress relief is accomplished by the thermal treatment as mentioned above.
http:
Review page 10.
RE: alloy 800ht
RE: alloy 800ht
RE: alloy 800ht
For that reason ASME VIII requires PWHT if operating above 1000°F
RE: alloy 800ht