Critical Pitting Temperature
The lowest temperature at which pitting corrosion begins in a 24-hour immersion

Critical Crevice
Corrosion Temperature
The lowest temperature at which crevice corrosion begins in a 100-hour immersion

Resistance to Localized Corrosion
Test data for general corrosion is often used to compare the corrosion resistance of metals in various environments. However, stainless steels fail more often due to pitting and crevice corrosion than from general corrosive attack.

Controlled tests that produce pits and crevice corrosion can be used to rank the relative performance of alloys. Haynes International has published the following results of laboratory immersion tests using an oxidizing NaCl-HCl solution of 4% sodium chloride, 0.1% ferric sulfate and 0.01% molar hydrochloric acid. The temperature of this solution, containing 24,300 ppm chlorides and pH of 2, was adjusted in 5° C increments to determine the critical pitting temperature and critical crevice corrosion temperature of each alloy.

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