The stress corrosion cracking and pitting of stainless steel strainer plates used in pulp mill digesters is discussed. Consideration is given to the part played by internal and external stresses in bringing about plate failure; the corrosive nature of the environment is also considered. A stress-relieving treatment designed to alleviate cracking is described. It was found that a molybdenum-bearing stainless steel heattreated at 1550–1600 F for 30 minutes followed by air or furnace cooling, showed no tendency to stress corrosion even in severely corrosive media. With face plates made from Type 317 alloy, stress corrosion was eliminated and pitting corrosion greatly reduced. 3.5.8

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Copyright 1956 by the National Association of Corrosion Engineers.
1956
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