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.

  • Corporate Authors:

    Southwest Research Institute

    6220 Culebra Road, P.O. Drawer 28510
    San Antonio, TX  USA  78228-0510

    Bureau of Motor Carrier Safety

    1200 New Jersey Avenue, SE
    Washington, DC  USA  20590
  • Authors:
    • Lyle, FFJ
  • Publication Date: 1976-2

Media Info

  • Pagination: 100 p.

Subject/Index Terms

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