The 6% molybdenum stainless alloys were developed for and are used in many highly aggressive environments. It is known that these materials will not perform to their potential if improperly heat treated or inadequately pickled. Second phases which can form from improper heat treatments and surface layer alloying element depletion can degrade corrosion resistance in seawater and similar high chloride environments. Data have been developed which correlate the microstructure resulting from thermal treatments with performance of UNS N08367 alloy in an aggressive laboratory test solution. Additional data examines the effects of low chromium surfaces in aggressive solutions.

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