Alloy UNS N08031 Plus (official UNS number under application) was developed very recently to create a material of the same corrosion behaviour as the conventional Alloy UNS N08031 but with improved fabrication characteristics to facilitate manufacturing of large components as much as in hot roll cladding as in shaping and heat treating of large dished vessel heads. The requirement of improved manufacturing characteristics was met by an increase of the nickel content from 31 to 34 % supported by a careful balanced addition of nitrogen and manganese. The new alloy UNS N08031 Plus can be solution annealed at lower temperatures between 1140 and 1160 °C and can be technically hot roll bonded using conventional methods and equipment.

Therefore, the new material can combine the high corrosion resistance of a high-chromium alloyed 6 % molybdenum steel with the cost reduction that can be achieved by roll bond cladding.

The paper describes in short the various production routes that can be used successfully for hot roll bond cladding of alloy UNS N08031 Plus on carbon steel and considers the resulting microstructure, corrosion behaviour and weldability.

Subject
Clad plates, Materials, Corrosion resistant alloys, Manufacturing, Microstructure, Nickel based alloys, Molybdenum alloys, Rolling, Corrosion resistance, Alloys, Tempering, Quenching and tempering, Heat treatment
Keywords:
alloy UNS N08031 Plus, roll bond cladding, microstructure, corrosion behaviour, weldability
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2017
Association for Materials Protection and Performance (AMPP)
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