- Author
- Interrante, C. G. | Early, J. G. | Hicho, G. E.
- Title
- Analysis of Findings from Four Tank-Car Accident Report. Report No. 5. Summary Report.
- Coporate
- National Bureau of Standards, Gaithersburg, MD
- Sponsor
- Department of Transportation, Washington, DC
- Report
- NBSIR 75-655, January 1975, 69 p.
- Distribution
- LIMITED DISTRIBUTION Available from National Technical Information Services
- Keywords
- hardness; railroads
- Abstract
- A comprehensive overview of the dindings and metallurgical analyses of tests conducted at the National Bureau of Standards on samples of tank-car materials submitted by the Federal Railroad Administration is presented. The submitted samples were taken from tank cars which had been involved in accidents during the period January 1970 to January 1971. The testing conducted during the metallurgical analyses included full chemical analyses, ambient temperature tensile tests on longitudinal and transverse specimens, quantitative metallography to determine ferrite grain size, pearlite colony size, and inclusion content, size, and shape, hardness tets, bend tests on longitudinal and transverse specimens, and a very comprehensive program of impact testing, which is covered in a separate report on Impact Properties. The data, which are presented in the Findings Section of this report and which are summarized and discussed in the Summary and in the General Discussions, represent a valuable body of information from which the Conclusions were drawn. These summaries and conclusions on the properties of these steels, and the metallurgical factors affecting these properties, when taken in conjunction with the service requirements and the observed behaviors of the materials during the actual service failures, can be useful in making recommendations as to approaches to improved materials and improved specifications for the plate materials for tank cars.