Ferritic stainless steels are well know for their excellent resistance to general, pitting and crevice corrosion. In addition to this they are immune to stress corrosion cracking in chloride environments. The low additions or absence of nickel as an alloying element renders these steels less expensive than the widely used chromium-nickel austenitic steels. Stainless steels are resistant to oxidising environments, for example nitric acid, due to the formation of a thin adherent layer of chromium oxide on the surface of the alloy. When the same steel is exposed to a reducing environment such as sulphuric acid, the passivity breaks down and the corrosion rate increases. To improve the corrosion rate in reducing environments various alloying additions can be made to an alloy. One such modification that can be made is the addition of Platinum group metals (PGMs) to an alloy which results in the dramatic reduction in the corrosion rate in reducing environments due to a process known as cathodic modification. This paper discusses the various alloying additions made to ferritic stainless steels, the process of cathodic modifications and how this has been used in the development of a cast, cathodically modified superferritic alloy for use in reducing environments.