Patent ID: 7367208
Filing Date: 2008-05-06
Classification: C21D

Abstract:
1. Coil winding method for metal bars after a rolling process which provides, at the rolling mill outlet ( 2 ), the following stages: a) cooling of the bar by means of a first water box ( b) performing equalisation in air up to a temperature of between 800° C. and 880° C. and surface tempering; c) cooling by means of one or more water boxes ( d) performing equalisation in air, after each of said water boxes ( e) winding of the bar in the form of a compact coil by means of coil winder ( f) cooling the bar in the form of a coil slowly so as to cause tempering of the bainite and martensite formed on the surface of the bar; g) straightening the bar wound in the form of a compact coil; and h) ageing naturally the bar, by maintaining the bar at ambient temperature.