Procedure for the thermal treatment of rails

US6547897B2 · kind B2 · utility

Assignee

• Voestalpine Schienen GmbH · AT

Inventors

• Alfred Moser · Leoben, AT
• Georg Prskawetz · Leoben, AT
• Peter Pointner · Leoben, AT

Key dates

• Filing date: May 25, 2001
• Grant date: Apr 15, 2003
• Expiry date: May 25, 2021

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C21D2221/02
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A method for the thermal treatment of rails, in particular of the rail head, in which cooling is carried out in a cooling agent that contains a synthetic cooling agent additive starting at temperatures above 720° C. The treatment is carried out by immersion in the cooling agent until withdrawal of the immersed areas occurs, at a surface temperature between 450 and 550° C. results without temperature equalization across the whole of the cross-section, thereby avoiding hardening of the rail web whilst maintaining an optimal cooling rate for the rail head.