STAINLESS STEEL PRODUCTS

Corrosion Resistance

For the moly ferritic stainless steels, the corrosion resistance is a function of the chromium and molybdenum contents. In common with the other ferritic stainless steels, the moly ferritics are not susceptible to Stress Corrosion Cracking (SCC).

434 and 436 have similar general corrosion resistance to 430. Their pitting resistance is, however superior to 430 but not as good as 304. 434 and 436 thus have good resistance to rural and industrial atmospheres but in marine atmosphere environments, staining may occur, unless they are regularly washed.

444 has good resistance to a wide variety of corrosive environments. With 18% chromium and 2% molybdenum the steel has good uniform and pitting corrosion resistance, similar to 316L in most environments. 444 is thus suitable for use in marine atmospheres.