SEDL / STP / STP880-EB / STP39154S

Factors Affecting the Stress Corrosion Cracking of Austenitic Stainless Steels Under Thermal Insulation

McIntyre, D
Battelle-Houston Operations, Houston, TX

Pages: 15    Published: Jan 1985

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Abstract

Fundamental factors affecting the stress corrosion cracking (SCC) of stainless steels under thermal insulation will be reviewed. Specific topics are susceptible alloys, problem temperature ranges, sources of chloride ions, effect of halides other than chlorides, effect of geographical location, effect of potential, pH and buffering agents, mechanisms of concentration, and mechanisms of inhibition. Field experience with closed cell versus wicking type insulation will be discussed. The effectiveness of the weather barrier in preventing SCC under insulation will be discussed in light of maintenance procedure and detail design practice.