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Corrosive attack occurring preferentially in the grain boundary regions of an alloy. It is also known as intergranular corrosion. Chromium nickel austenitic stainless steels are prone to this form of corrosion when they are welded and subsequently in contact with certain types of corrosive media. When heated within a temperature range of 450 ~ 800 C precipitation of the chromium carbides takes place at the grain boundries in the area of the weld and these areas not longer have the protection of the chromium on the peripneries of the grains.
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