In hydromechanical descaling, the scale layer is broken up by means of a high-pressure water jet so that the scale shrinks due to spontaneous cooling. The water, which evaporates abruptly in the process, acts like small explosions, blasting off the scale, which is finally washed away by the remaining water. Thus, in hydromechanical descaling, cooling, crushing and evaporation effects interact and reinforce each other. Compared to mechanical processing, this process is a more effective and economical solution.