Developing Low Service Temperature Steels for Railroad Truck Castings

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. 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. Transportation Technology Center, Inc. obtained specimens from each of the six materials and evaluated their tensile properties at room temperature and -60 °F. Charpy impact specimens were tested at temperatures ranging from -20 °F to -120 °F. The evaluations were performed at the Transportation Technology Center (TTC) in Pueblo, CO, and Ohio State University from June 7, 2016, to October 6, 2017. The measured room temperature tensile properties of each of the six steels met or exceeded the requirements for grade B+, the steel currently used for truck castings.

Language

  • English

Media Info

  • Media Type: Digital/other
  • Features: Figures; Photos; Tables;
  • Pagination: 4p
  • Serial:
    • Research Results
    • Issue Number: RR 20-06
    • Publisher: Federal Railroad Administration
  • Publication flags:

    Open Access (libre)

Subject/Index Terms

Filing Info

  • Accession Number: 01741742
  • Record Type: Publication
  • Files: NTL, TRIS, ATRI, USDOT
  • Created Date: May 22 2020 3:08PM