The corrosion resistance of nine Cr-Ni-Mn austenitic and duplex austenitic-ferritic stainless steels, containing up to 5 percent molybdenum, in hot deaerated sulfuric acid and boiling concentrated nitric acid was determined and compared to the behavior of recognized commercial grades. A limited evaluation of mechanical properties was performed.

The corrosion resistance of these alloys was affected by molybdenum additions in a manner similar to that observed in Cr-Ni austenitic steels:

  1. The ability to tolerate minimal oxidizing environments such as sulfuric acid was markedly improved.

  2. The resistance toward strongly oxidizing acidic conditions was reduced.

The presence of delta ferrite effected improved resistance in sulfuric acid and materially diminished corrosion resistance in hot nitric acid.

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© 1963 National Association of Corrosion Engineers
1963
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