Abstract
The Jominy end-quench hardenability specimen has been shown from earlier studies to serve as a useful screening tool for detecting sensitization in Type 304 stainless steel. The present study has investigated this technique for assessing sensitization developed in the various thermal cycles encountered in the fabrication and service of this type of stainless. The technique shows that the sensitization encountered is associated with heating and cooling from 800–950°C rather than higher temperatures; such fabrication or service should be above 1000°C to forestall sensitization. Differences in sensitization between test specimens and larger sections are attributed to the development of stresses that accentuate precipitation of M23C6 during cooling. The proper level of nitrogen can retard and reduce sensitization; these effects are related to chromium and carbon equivalents.
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