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.

Subject
Weld attack, Materials, Filler metals, Nickel chromium molybdenum alloys, Welding, Wiring, Crevices, Crevice corrosion, Specimen preparation, Corrosion resistance, Stainless steel, Wrought metals, Test specimen
Keywords:
Crevice corrosion, AL6XN1, UNS N08367, alloy 622, UNS N06022, alloy 59, N06059, marine, welds, weld dilution
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2009
Association for Materials Protection and Performance (AMPP)
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