Effect of Nickel in Cr-Ni Stainless Steels on the Critical Potential for Stress Corrosion Cracking

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Abstract
Increasing amounts of alloyed Ni in 20% Cr stainless steels improve resistance to stress corrosion cracking in part by shifting to more noble values the critical potentials below which failures are not observed. When the critical potential for any alloy becomes more noble than the corresponding corrosion potential (>26% Ni) the alloys are resistant to at 130°C for >200 hr. Nevertheless, rapid failure of such alloys up to 35% Ni, and probably including 45% as well, can be induced by anodic polarization to a potential which is noble to the corresponding critical value.

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