CORROSION OF NI-CR-MO WELDMENTS ON UNS N08367

摘要

There is currently interest in the use of a 6 Mo stainless steel (UNS N08367) for applications on naval vessels. While the base material has good resistance to corrosion in marine environments, the welds are in a non-optimal metallurgical condition. Therefore over-matched filler metals need to be used when welding this 6-Mo stainless steel in order to assure proper corrosion resistance. The importance of weld dilution by the base metal is demonstrated. Two Ni-Cr-Mo alloys (UNS N06022 and N06059) were used to produce welds of various dilution amounts. These were then tested in high chloride environments to evaluate how pitting and crevice corrosion might be affected by changing filler metal and the amount of dilution from the base metal.