Investigation of the influence of processing parameters during hot rolling on tertiary scale formation

The permanent demand for a cost saving production of flat products of steel as well as the technical progress in the engineering established the basis for a substitution of cold rolled products by hot rolled products. Precondition is a systematic control of the inevitable oxidation of the strip during the entire hot rolling process. With the generation of appropriate scale properties at hot rolled strip, taking into account the required mechanical properties, a direct processing of hot strip without prior pickling, cold rolling and annealing could be possible. The knowledge of the influence of the processing conditions during hot rolling on the properties of tertiary scale, especially the thickness, the constitution and adherence is incomplete till now. That's why influences on the oxidation and scale properties respectively during the hot rolling process starting from the finishing line to the coiling as well as consequences for the downstream process are discussed in this paper based on the results of laboratory hot rolling trials to the simulation of considerably processing parameters in the finishing line.