This is my first post here, so please take it easy.
I was wondering if anyone here has any real world experience with welding 3310 or 4320. I have a project I am working on where I will need to weld some alloy steel forged rings to a A106 pipe.
The material will either be 3310 or 4320. The steel will be quenched and tempered at 900 deg F to bring up the toughness but still retain the yield/tensile that the engineers want.

My question is: can we weld these steels with a preheat around 300F and a max interpass of around 500F? After welding the parts will be blanket cooled (or could be left to air cool). We can not perform a true PWHT due to limited resources.

Please let me know if you have any thoughts on this!