Hydro-mechanical descaling process
In hydro-mechanical descaling processes the jets are formed by special descaling nozzles which are arranged on spray headers in a so called descaling box (or mill descalers) through which the product (slab, strip, billet, bloom, beam blanket, etc.) travels. Working pressure range from 80 to 450 bar.
Because the interface bond between the scale and the steel surface can be very different a proper descaling nozzle setup is of major importance to reach best descaling results. The setup of a descaling system includes nozzle parameters and the nozzle arrangement. Both have a major influence on the descaling factors, hence the descaling performances. The impact with which the descaling water impinges on the surface is the main criteria to measure the efficiency of a descaling nozzle, this is given in N/mm2.