Accession Number : ADA331024

Title :   Evaluation of the Stress Corrosion Cracking Susceptibility of Fire Suppressant Storage Container Alloys in Replacement Candidates for Halon 1301, Tri-Service Committee on Corrosion Proceedings

Descriptive Note : Conference proceedings

Corporate Author : NATIONAL BUREAU OF STANDARDS GAITHERSBURG MD INST FOR MATERIALS SCIENCE AND ENGINEERING

Personal Author(s) : Stoudt, R. ; Fink, J. L. ; Ricker, R. E.

PDF Url : ADA331024

Report Date : JUN 1994

Pagination or Media Count : 14

Abstract : Halons 1301 and 1211 have been identified as chemicals with sufficient ozone depletion potential to warrant limitations on their production and use. Several candidates have been selected as replacements for Halon 1301 and because their behavior is not well understood, their compatibility with the alloys used in the storage and distribution systems is of great concern. The service conditions require long term exposure of these alloys to the replacement agent under high pressures and as a result, these alloys may be susceptible to environmentally assisted failures. Therefore, an evaluation was undertaken to determine the propensity for failure of any of the alloys selected for use as containment vessels by an environmentally assisted fracture mechanism as a result of exposure to the replacement candidates. Data from in-situ slow strain rate tensile tests in the pure agent were used to formulate a ranking of each agent/alloy combination. The results of this ranking indicated that some alloy/agent combinations were less desirable than others, but overall, the potential for failure of the selected alloys by stress corrosion cracking (SCC) is relatively minor under the evaluated conditions. From this it was concluded that a suitable alloy can be selected for any of the replacement agents and that no agent should be eliminated from further evaluation because it promotes SCC in the containment vessel alloys. However, additional testing is required at lower temperatures, with and without the presence of contaminates, before a final conclusion can be made regarding the susceptibility of these alloys to environmentally induced failure in the replacement candidates.

Descriptors :   *ALLOYS, *STRESS CORROSION, *FIRE SUPPRESSION, TENSILE STRENGTH, CRACKING(FRACTURING), REPLACEMENT, CONTAINERS, STATISTICAL ANALYSIS, STORAGE.

Subject Categories : Properties of Metals and Alloys
      Safety Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE