Corrosion behaviour of Ni‐Resist cast irons

Owing to their relatively high alloy content, Ni‐Resist austenitic irons exhibit a higher degree of corrosion/erosion resistance than ordinary cast irons or cast carbon steels in all environments. The influence of the nickel alloying addition increases the “nobility” of Ni‐Resist, placing it in the galvanic table between the nickel‐free ferrous metals and copper‐base alloys such as gunmetal and aluminium bronze. Ni‐Resist irons vary in alloy content, to meet specific requirements, and are produced with both flake‐graphite and spheroid‐graphite structures. Practical experience indicates that in most applications the corrosion resistance of an SG Ni‐Resist iron is similar or superior to the corresponding flake‐graphite grade.