CONTROLLED METHOD AND DEVICE FOR OXIDATION/REDUCTION OF THE SURFACE OF A STEEL STRIP RUNNING CONTINUOUSLY THROUGH A RADIANT TUBE OVEN FOR GALVANISATION THEREOF

摘要

The invention particularly relates to a method for guaranteeing the oxidation of a strip designed to prevent the selective oxidation of alloy elements of the steel in a continuous steel strip galvanising annealing furnace having a pre-heating section and a hold section and provided only with radiant tubes, the oxidation of the strip being designed to prevent the selective oxidation of elements of the steel alloy, characterised in comprising the following steps: installation of at least one modified tube capable of injecting an oxidising medium at at least one point in the oven heating section and/or at at least one point in the hold section and injection of the oxidising medium by means of the modified tube(s), the oxidising medium having a composition such that in the conditions of the temperature of the oxidising medium and the steel strip and as a function of the chemical composition of the strip said medium has a dew point which guarantees an in-depth oxidation of the alloy elements of the steel strip.