Device for processing a metal surface

Device used in processing of a surface of a metal object which surface is essentially continuously in onwards motion, comprising at least one reservoir filled with a processing agent capable of receiving a feed of the metal object, the reservoir provided with nozzles in at least one position, the nozzles installed and positioned within the reservoir with respect to each other so that jets of the processing agent are directed onto the whole surface of the metal object processed by means of the nozzles, there being at least three nozzles that are positioned circumferentially around the longitudinal axis of the metal object, in order that at most 70 percent the surface of the metal object processed is under processing in one position of the directing processing agent, and so that essentially the whole surface to be processed is at least once under the jets of the processing agent when the whole surface of the metal object is going through the device, a hole of each nozzle from which the jet of processing agent emerges having a maximum width less than eight times the width of the surface of the metal object.