In laboratory and production-scale trials, rails were subjected to austenitizing temperature 850 to 900 C (holding for 1-1/2 hr), cooling for 35 to 40 min in a molten bath of 50% KNO sub 3 and 50% NaNO sub 3 with a water addition of 9.68% to increase cooling efficiency. The temperature of the molten bath varied between 280 and 320 C according to the chemical composition of the steel. The rails are rinsed in hot water (50 C) after quenching. Properties were investigated on sections from carbon, silicon, chromium and Cr-Si-Mn steel rails. The isothermally quenched rails had a high tensile (130 to 160 kg/sq mm) and fatigue strength (53 to 68 kb/sq mm) and, with optimum structure, showed good resistance to brittle failure. Ductile and impact properties were satisfactory and a more favourable pattern of internal residual stresses was obtained.

  • Supplemental Notes:
    • This abstract is also contained in "A Bibliography on the Design and Performance of Rail Track Structures", September 1974, RRIS #072794, which was prepared for the Urban Mass Transportation Administration.
  • Corporate Authors:

    Metals Society

    1 Carlton House Terrace
    London SW1Y 5DB,   England 
  • Authors:
    • Kazarnovskii, D S
    • Pridantsev, M V
    • Babich, A P
    • Gurenko, V D
    • Biryukova, V N
    • Aref'ev, B V
  • Publication Date: 1970-5

Media Info

  • Pagination: p. 465-468
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00072808
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Feb 11 1976 12:00AM