Heating and Cooling Rate during and after PWHT of P91 SMAW welds for small plates like 200 X 80 X 12 ?

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Junaid Aslam

I have visited following web link regarding risk of P91 steel Temper Embrittlement.

http://www.btsteelpipe.com/NEWS/A335_P91_alloy_pipe_temper_brittleness.html?fbclid=IwAR1kDjpg5by-7bXCVBFa958bQY6t4lCZXnPH5DI4RS8GCuSpLpS1686bnMQ

I need guidance for the following

i. Risks of low temperature temper brittleness and high temperature temper brittleness in Post Weld Heat treatments of A335 P91 Welds (SMAW and GMAW).

ii. What should be the mode of cooling after PWHT i.e. it should be cool in air or in furnace.

Regards