Title: Method for lessoning internal stress of steel rail straightened by rolling
Application Number: 86100209 Application Date: 1986.01.17
Publication Number: 1001662 Publication Date: 1986.07.16
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: C21D9/04
Applicant(s) Name: Krupp Stahl Alelingesellschaft (DE) Alleestrasse 1 Address:
Inventor(s) Name: Jurgen Flugge;Lutz Weber;Reinhard Schweitzer;Wilhe
Attorney & Agent: ZHENG SONGYU LI YI
Abstract:
    The present invention relates to a process for reducing internal stresses of roller straightened rails. After the straightening operation the rail web portion is heated for a short time to temperatures ranging between 200 DEG -700 DEG C, preferably between 350 DEG -500 DEG C, and after reaching the desired temperatures the rail is cooled by air to room temperature. For the purpose of heating the rail is continuously conveyed in front of the heating apparatus. The inventive process permits to reduce internal stresses in the rail head and base portions to a value of less than 50 N/mm2 thus ensuring increased rupture strength of the rail.
Time: 4