The heat treatment process is a time-consuming operation for Ovako and therefore the maximum weight of bars is loaded in continuous rolling hearth furnaces. Unfortunately, this causes some problems with mixing. There are mixtures of different types of steel or different dimensions. This causes problems in the next operating steps such as cutting machining and plastic deformation. In this report, possible solution proposals are given to avoid mixing in roller heater 2, also called RH2. Several proposals were evaluated by tests of marking systems and examinations of the various ovens. A larger amount of theoretical proposals have been discussed with experts, but have not been tested in practice since most of the theories are based on larger investments and remodeling. The investigation of RH2 shows that the oven has a great need for maintenance. Therefore, flanges and guide stones have been installed in a restricted zone for remedial maintenance and this effort will be evaluated at the next larger production stop.