Method for heat-treating profiled rolling stock

US6224694A · kind A · utility

Assignee

• Voest-Alpine Schienen GmbH & Co. KG

Inventors

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

Key dates

• Filing date: May 12, 2000
• Grant date: May 1, 2001
• Expiry date: May 12, 2020

Classification

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

Abstract

Method for heat-treating profiled rolling stock, including track and railroad rails, having a profiled surface and increased heat removal from portions of the profiled surface during cooling in the gamma range of an iron based alloy material. The method includes aligning the profiled rolling stock, at an average temperature of between 750.degree. C. and 1100.degree. C., straight in its longitudinal direction by plastic shaping, and moving the aligned profiled rolling stock, in its aligned state, in a transverse direction and holding same there. The method also includes evenly cooling of the aligned profiled rolling stock, in a first cooling, to a temperature below 860.degree. C., with the same local cooling intensity, by radiation, in still air, removing heat from the first cooled profiled rolling stock, in a second cooling, in the longitudinal direction with an intensity which locally is essentially the same, but, when viewed in cross section, is circumferentially different, and increasing the cooling intensity in at least one zone at the circumference of the first cooled profiled rolling stock. Greater cooling intensities are assigned to areas with one of a large cross sectional …