welding of P91 material to P1 materrial
welding of P91 material to P1 materrial
(OP)
For Steam Blow piping i have to weld P91 to Carbon steel A106 Gr B piping. I believe after post weld heat treatment at 750deg C as required By P91, carbon steel gets week and may crack. same may happen at elevated temperatures at steam Blow please give me ur openion.





RE: welding of P91 material to P1 materrial
I would strongly suggest you use a transition piece of sufficient length between the Grade 91 and carbon steel. I would use P22 material (2.25% Cr-1% Mo) welded to Grade 91, PWHT. After this operation, you can weld the carbon steel to Grade 22, and perform a second PWHT, if required for the carbon steel to P22 weld joint.
RE: welding of P91 material to P1 materrial
RE: welding of P91 material to P1 materrial
How about a set of flanges of different materials ?
-MJC