Over the years, the gap between stainless steels and Ni-base alloys has become increasingly diffuse, not only in terms of chemical composition but also when considering performance in corrosive service conditions. While Ni-base alloys can sometimes be considered the safe choice, alternatives with a lower nickel content are often more cost efficient. Due to advances in material technology and the always-increasing knowledge about material performance, high-alloyed stainless steels can indeed be attractive and competitive materials of choice for highly corrosive service conditions.

This work focuses on characterizing various high-alloyed stainless steels and Ni-base alloys in terms of localized corrosion performance, as well as uniform corrosion performance in chloride contaminated sulfuric acid. Corrosion data will be presented to demonstrate differences and similarities between these material groups, and between individual grades. This knowledge can be used to make better-informed decisions when selecting materials for highly corrosive applications.

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