The Influence of Specimen Type and Heat Treatment on the Caustic Stress Corrosion Cracking of Some Stainless Alloys

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Abstract
Stress corrosion tests have been conducted on martensitic, ferritic, and austenitic steels and nickel-base alloys. The tests were conducted on stressed U-bend specimens cut from sheet and tubing and on C-ring specimens cut from tubing. The deoxygenated environments were 10% NaOH at 600 and 630 F (316 and 332 C) and 50% NaOH at 600 F (316 C). The effects of temper embrittlement and sensitization on applicable alloys were studied. It was found that U-bend specimens cracked more readily than C-ring specimens, and that the choice of specimen can affect the relative ranking of some alloys. Temper embrittlement was found to be deleterious to the ferritic alloys, and sensitization was not found to be damaging to the austenitic alloys. The results are discussed with reference to stress, alloy composition, and structure.

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