Overall corrosion always increases with an increase in temperature. Concentrated cell or crevice corrosion. Caused by a difference in concentration of ions, or oxygen in stagnant areas causing an electric current to flow. Common around gaskets, set screws, threads, and small crevices. Found in other than stagnant areas.
Chlorides are a common cause.
Can be recognized by pits and holes in the metal. Stress corrosion cracking. Threshold values are not known. A combination of chloride, tensile stress, and heat are necessary. Chloride stress corrosion is a serious problem with the 300 series of stainless steels used in industry.