US 2009/0014099 A1 · Rail manufacturing method

Abstract

A rail manufacturing method is provided, in which a billet is hot-rolled into a rail form and the rail is cooled to ambient temperature. The foot part of the rail can be mechanically restrained to improve the straightness of the rail during at least the period of cooling where the surface temperature is between 800° C. and 400° C. In the subsequent cooling process, at least while the surface temperature of the foot of the rail is between 400° C. and 250° C., the rail is kept in an upright state, and cooled naturally without using insulation or accelerated cooling.

Claims12

Dependent claims

A rail manufacturing method, comprising:

a) hot-rolling a billet into a form of a rail having a high temperature;
and
b) after step (a), cooling the high-temperature rail is cooled to ambient temperature, wherein the rail is maintained in an upright position until a temperature of a surface of a head of a rail reaches a temperature range of substantially 400° C. to 250° C., and where the rail is cooled naturally without a use of at least one of an insulation and an accelerated cooling procedure.

Dependencies are inferred from the claim text.

Facts

Application

10/585,472Filed 7 Jan 2005

Priority

JP 2004-0043589 Jan 2004

Published

15 Jan 2009

Term ends

Not estimatedThe source records don’t support an estimate.

Classification7 codes

C21D 9/06
For rails: with diminished tendency to become wavy
C21D 9/04
Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor: for rails
B21B 1/085
For rolling structural sections, i.e. work of special cross-section, e.g. angle steel: rail sections
B21B 2045/0254
Using liquid lubricants, e.g. for sections, for tubes: for structural sections, e.g. H-beams

Rail manufacturing method

Life of this patent

Rail manufacturing method

Life of this patent

Abstract

Claims12