EVALUATION OF PLAIN AND HEAT-TREATED RAIL MANUFACTURED BY NIPPON KOKAN KK

Evaluations were made of metallurgical and mechanical properties of 136RE rail manufactured by Nippon Kokan K. K. Un-heat-treated, quenched and tempered, and slack-quenched specimens were examined. It was found that all mechanical properties tested were satisfactory and that the impact resistance of the slack-quenched specimen was superior to that of the conventionally treated (quench and temper) specimen. However, potentially detrimental inclusions of an anomalous nature in all three kinds of rail were found. The hardness variation within the head of the slack-quenched specimen was found to be somewhat irregular. The anomalous inclusions could probably be eliminated by minor adjustments in the steel making process or equipment. The irregular hardness profile is apparently inherent in the application of slack-quenching to rail steel.

Media Info

  • Features: Figures; Tables;
  • Pagination: 46 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00188120
  • Record Type: Publication
  • Source Agency: Association of American Railroads Technical Center
  • Report/Paper Numbers: AAR Rpt R-318 Res Rpt.
  • Files: TRIS
  • Created Date: Feb 27 1979 12:00AM