United States Department of Transportation
i
Developing Low Service Temperature Steels for Railroads Truck Castings
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2020-05-01
[PDF-443.54 KB]
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Edition:Research Results
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Abstract:At low temperatures, plain carbon steels, such as the types used in truck castings, can fracture in a brittle manner, with no visible deformation. The ability of a material to deform without fracture is its toughness or ductility. Figure 1 shows a broken side frame. The addition of elements such as nickel can help steel maintain its toughness at low temperatures. Using steels with such additives in specific, low temperature applications could prevent brittle failures of truck castings. The research performed for the Federal Railroad Administration (FRA) previously identified six grades of steel currently used in low temperature applications that could potentially be used as truck castings. These materials are specified under the American Society of Testing Materials (ASTM) A352, Standard Specification for Steel Castings, Ferritic and Martensitic, for Pressure-Containing Parts, Suitable for Low- Temperature Service. The grades are named LCC, LC2, LC3, LC4, LC9, and CA6NM, and their most common applications are for pump and valve bodies in low temperature service.
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