Super-Tough Steel for Bridges and Other Applications

Higher toughness in steels permits the presence of longer fatigue cracks prior to rupture making it less likely that they would escape detection. Since steels become brittle at cryogenic temperatures, a steel with higher fracture toughness at low temperatures than existing steels is of interest for infrastructure applications such as bridges and tank cars that transport cryogenic liquids such as liquid chlorine or compressed natural gas. Such a steel (ASTM A710 Grade B) was previously developed at Northwestern University and was successfully used in construction of a bridge at Lake Villa, Illinois. This steel is produced by hot-rolling and air-cooling, is easily weldable without pre- and post-heating, is very corrosion-resistant and possesses very good fracture toughness at low temperatures. During development of this steel, the effects of different elements on the mechanical properties of the steel were investigated. In one steel composition, 0.1% titanium was added to further improve its welding properties. That steel had phenomenal fracture toughness. This project investigated the effect of the addition of various levels of titanium on the mechanical and fracture properties and microstructure of A710 Grade B steel. This study resulted in an invited paper for American Society for Metals Materials and Technology Conference, M&TC 2009; a full copy of this paper is attached and highlights of it are summarized in this report.

  • Record URL:
  • Supplemental Notes:
    • This research was sponsored by the U.S. Department of Transportation, University Transportation Centers Program.
  • Corporate Authors:

    Northwestern University, Evanston

    Department of Materials Science and Engineering, 2220 Campus Drive
    Evanston, IL  United States  60208-3108

    Northwestern University, Evanston

    Center for the Commercialization of Innovative Transportation Technology
    Transportation Center, 600 Foster Street
    Evanston, IL  United States  60208
  • Authors:
    • Vaynman, Semyon
    • Fine, Morris E
    • Chung, Yip-Wah
  • Publication Date: 2009-8-24

Language

  • English

Media Info

  • Media Type: Web
  • Edition: Final Report
  • Features: Figures; Photos; References; Tables;
  • Pagination: 18p

Subject/Index Terms

Filing Info

  • Accession Number: 01141699
  • Record Type: Publication
  • Files: UTC, TRIS
  • Created Date: Oct 13 2009 12:06PM