Abstract
Abstract Stress corrosion cracking (SCO of carbon and alloy steels in liquid ammonia has occurred spasmodically over the last twenty years. At the present time, U. S. Department of Transportation regulations provide effective safeguards to prevent this problem through the required use of postweld heat treatment and the use of 0.2% water as an inhibitor. In view of the increasing use of ammonia as a direct fertilizer and as a chemical intermediate necessitating the increasing use of steel for transport and storage tanks, a research program was undertaken to identify the environmental factors that control SCC of steels in ammonia and also to evaluate present and potential palliative procedures to inhibit SCC of steels in service. In this program, numerous accelerated SCC tests were conducted on ASTM A517 Grade F steel, and the results may be summarized as follows: (1) Oxygen contamination in ammonia is the primary cause of SCC. The simultaneous presence of nitrogen contamination markedly increases susceptib...
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