Patent ID: 6056913
Filing Date: 2000-05-02
Classification: C21D,Y02P

Abstract:
A plant for the continuous heat treatment of elongated steel elements, which comprises(a) an insulated non-magnetic housing defining an inlet for the elongated steel elements to be heat treated and an outlet for the heat treated steel elements,(b) two unheated rollers arranged in the housing at a distance from each other, the rollers having axes parallel to each other, a first one of the rollers being arranged to receive the elongated steel elements from the inlet, and a second one of the rollers being arranged to receive the elongated steel elements from the first roller, the elongated steel elements being wound around the rollers to be returned from the second roller to the first roller whence they are withdrawn from the housing through the outlet after passing over the first roller, and(c) a transformer plate assembly comprising(1) a secondary winding formed by the elongated steel elements as they pass from the second roller back to the first roller, and(2) a primary winding arranged outside the housing and maintained at a winding ratio dependent on the desired electrical power, whereby the elongated steel elements are heated in the transformer plate assembly and are then quenched by the elongated steel elements received by the first unheated roller through the inlet and by the first unheated roller itself.