Process and apparatus for pickling a rolled metal strand, particularly for steel strip

摘要

Process for pickling a rolled metal strand, especially a steel strip comprises continuously moving the strip through a pickling bath and a rinsing bath; and using a contactless IR radiation detector (pyrometer) to detect scale on the surface of the metal strand. An Independent claim is also included for a device for pickling a rolled metal strand, especially a steel strip comprising one or more IR radiation detectors (3) placed on the path of the pickling bath (2a) and/or the rinsing bath (2b). Preferred Features: The IR radiation detectors a used in the wavelength regions of 8-14 microns . The detectors determine differing scale structures (5) by the different degrees of emission.