I've got the subject scenario to do. I need to qualify a weld procedure. Planning on 400°F preheat and 1350°F or so PWHT. Having some difficulty picking the best filler metal. Line will be in high temperature steam service. I was thinking either going matching the lower alloy and using ER80S-B8 or the higher and use ER347H. Third choice would be ER309 or ER309Mo.
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