Abstract
The corrosion properties of the highly alloyed stainless steel AVESTA 254 SMO (UNS S31254) are compared with those of conventional stainless steels and nickel base alloys. Laboratory tests as well as field tests in natural seawater, including tests in Middle East desalination plants, show that the corrosion resistance of this 6 % Mo stainless steel is superior to that of other stainless steels, those containing up to 6 % Mo included. The experiences gained from a great number of industrial applications are reported. AVESTA 254 SMO is successfully used in most types of seawater handling systems, e.g. in plate and tubular heat exchangers (more than one year service in Arabian Gulf countries), in power plant condensors (tubes as well as tube plates), and in cooling water pipes, ballast water pipes, fire fighting pipes and gas heaters on offshore oil and gas production platforms.
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