Uranus 31 is a super austenitic stainless steel with very high contents of nickel, chromium and molybdenum. The alloy is designed to give properties in-between superaustenitic and nickel base alloys for very demanding applications from the corrosion aspect.

The high content of chromium and molybdenum gives an excellent resistance to localized corrosion. The high nickel content gives a very good resistance to stress corrosion cracking. The overall performance of the alloy is better than 825 and could be considered for replacing Alloy 625 in sour gas service. The alloy composition also gives an excellent resistance to oxidizing as well as reducing environments.