Have welded piping 9 chrome using electric preheat to contol and monitor interpass temperatures with approved and demonstated weld procedure. Many hardness readings after PWHT are in excess of Code allowable of 241 BHN. All the obvious variables have been checked, ie materials & welds PMI'd as well as calibration of all equipment.
Looking for someone that has seen this problem in the past, determined the cause, and and how it was resolved.
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