A STUDY OF STRESS CORROSION PHENOMENA RESULTING FROM TRANSPORTATION OF ANHYDROUS AMMONIA IN QUENCHED-AND-TEMPERED STEEL CARGO TANKS
The primary causative agent of stress-corrosion cracking (SCC) of quenched-and-tempered steels exposed to liquid ammonia is oxygen contamination. Under certain conditions carbon dioxide and water may also act as causative agents. Water in concentrations of 2000 ppm or greater inhibits SCC. Methane and nitrogen also exhibit inhibitory effects. As produced liquid ammonia contains sufficient oxygen to cause cracking in many cases. The slow-strain-rate method is an accelerated test which produces stress-corrosion fractures with characteristics identical to those of service failures. A statistically determined discriminant function, D sub P, may be used to predict the SCC behavior of production ammonias. Another discriminant function, D sub L, is more applicable for high-purity, methane-and water-free ammonias.
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Corporate Authors:
Southwest Research Institute
6220 Culebra Road, P.O. Drawer 28510
San Antonio, TX United States 78228-0510Bureau of Motor Carrier Safety
1200 New Jersey Avenue, SE
Washington, DC United States 20590 -
Authors:
- Lyle, FFJ
- Publication Date: 1976-2
Media Info
- Pagination: 100 p.
Subject/Index Terms
- TRT Terms: Alloy steel; Ammonia; Commodities; Containers; Contaminants; Corrosion; Fracture mechanics; Freight transportation; Mechanical strain; Metal heating; Oxygen; Railroad materials; Steel; Stress corrosion; Tank cars; Water
- Uncontrolled Terms: Anhydrous ammonia; Heat treatment; Strain rate
- Old TRIS Terms: Liquid ammonia; Tank car construction materials
- Subject Areas: Freight Transportation; Geotechnology; Highways; Materials; Safety and Human Factors;
Filing Info
- Accession Number: 00133080
- Record Type: Publication
- Source Agency: National Technical Information Service
- Report/Paper Numbers: SWRI-01-4101-001 Final Rpt., DOT-FH-BMCS-11-8568
- Contract Numbers: DOT-FH-11-8568
- Files: NTIS, TRIS, USDOT
- Created Date: Jun 23 1976 12:00AM