hello friend may be you're right that this steel is common ph, but actually i can't find any paper about weldability of 17-4 or dissimilar welding with another alloy. i want academic paper with experimental result? do you know such document? title of my MSc thesis is laser or tig welding of 17-4 presumably. for this reason, i looking for prior research about this subject.
Really? I thought that you would take care of that sort of light work for me!!! :) :) :) I'm confident that you can handle his query, or am I overly confident in your ability?
Do not hijack this thread! The person works for SEPCO and he should be able to have access to all of the applicable code reference necessary to answer his own query, so just tell him to ask around his office! they have plenty of experience in P-91 piping, so go find someone else to play with! ;)