Patent ID: 6689230
Filing Date: 2004-02-10
Classification: C21D

Abstract:
A method of cooling a steel section from rolling heat, wherein the section has different section parts of different masses located at a distance from each other over a cross-section of the section, the steel having a steel quality, the method comprising subjecting the steel section with a head thereof facing downwardly and a base thereof facing upwardly to a series of defined immersion procedures of a very short duration in a trough filled with water, determining and computing heat quantities to be proportionally removed from the different section parts in dependence on the masses and temperatures thereof and a quantity of cooling medium required for removing the heat by using measuring equipment together with a computing unit by means of a computer program, and subsequently carrying out cooling of the section parts in a controlled manner using short immersion procedures such that the section parts reach with as little time delay as possible the transformation line Ar3/Ar1 during the decomposition of the gamma-mixed crystal into ferrite and/or pearlite while releasing the transformation heat in dependence on the steel quality.