Abstract

The resistance of stainless steel nut and bolt fasteners to crevice corrosion and stress corrosion cracking (SCC) has been studied using natural and accelerated tests. The influence of surface treatments and of alloy composition has been assessed. Unequivocal examples of SCC have been observed in Type 304 components immersed at 35 °C in neutral, 3% NaCl solutions. A Stress Corrosion Cracking Susceptibility Index has been derived, which gives good correlation between the failures observed and the carbon, sulphur, chromium and molybdenum contents of austenitic stainless steel alloys.

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