Moly Ferritics - Corrosion Resistance

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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).

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

U-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 U-316L in most environments. U-444 is thus suitable for use in marine atmospheres.