51316-7563-UNS N08031 and UNS N08031 Plus multipurpose alloys for chemical industry and related applications

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Product Number: 51316-7563-SG

ISBN: 7563 2016 CP

Author: Helena Alves

Publication Date: 2016

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Alloy UNS N08031 is combining the advantages of high-chromium alloyed materials i.e. an excellent resistance to corrosive attack by oxidizing media with a molybdenum content of more than 6 %. The nickel content is comparatively low. This way it was possible to create the highly corrosion resistant material UNS N08031 in using only small amounts of expensive alloying elements.Alloy UNS N08031 exhibits an excellent resistance to pitting and crevice corrosion in neutral and acid aqueous solutions which makes it superior to the known 6 % Mo stainless steels and nickel alloys. Therefore it lends itself to applications as e.g. flue gas desulfurization concentrating of diluted sulfuric acid phosphoric acid pulp & paper acetic acid and hot seawater as a promising material for a multitude of applications. Alloy UNS N08031 is readily weldable without any risk of intercrystalline corrosion.The successful and widespread use of alloy UNS N08031 resulted in the need to make it easier to handle since the original alloy is requiring a solution annealing treatment at about 1180 °C followed by fast cooling which is not so easy to perform in every place of manufacturing. This requirement was met by a recent adaptation of alloy composition resulting in an alloy UNS N08031 Plus. The alloy UNS N08031 can be solution annealed at temperatures between 1140 and 1160 °C which is much more convenient in manufacturing than before with annealing at 1180 °C. The adaptation facilitates manufacturing of large components as much as in roll bond cladding as in shaping and heat-treating of large dished vessel heads.Keywords: alloy UNS N08031 alloy UNS N08031 Plus Ni-Fe-Cr-Mo-Cu alloys solution annealing of large sections roll bond cladding