The invention relates to a method for pickling steel sheets 8, the steel sheets being continuously dipped in a pickling bath 1, containing a pickling solution 10, the bath being connected to a treatment unit including a recirculation tank 3, circulators 12 and 13, a continuous entering flow 11 of the solution being fed into an ultrafiltration device 2 from the recirculation tank 3 and two flows exiting the ultrafiltration device, one filtered exiting flow 21 being then fed back inside the recirculation tank 3 and one unfiltered flow 22, the treatment unit including no storage tank.

To make ultrasonic waves can be propagated with better efficiency throughout the entirety of a treatment tank, and an object to be cleaned can be cleaned with better efficiency regardless of the type of the object to be cleaned.

An ultrasonic cleaning equipment (1) according to the present invention includes a treatment tank (10) that stores a cleaning liquid that cleans an object to be cleaned and in which the object to be cleaned is immersed; an ultrasonic application mechanism (20) that applies ultrasonic waves to the cleaning liquid retained in an interior of the treatment tank; and a curved surface member (30) that is located in a range prescribed by a prescribed angle of inclination from a normal direction in an end portion of a vibrating surface of the ultrasonic application mechanism to an outside with respect to the vibrating surface and that is held on a wall surface and/or a bottom surface of the treatment tank. The curved surface member has a convex curved surface (31) in which at least a convex curved part (33) having a surface shape of a spherical surface or an aspherical surface exists and the convex curved part is in a state of protruding more on a side of the vibrating surface than a portion other than the convex curved part does, and the convex curved surface is held in a state of facing the vibrating surface in such a manner that at least part of first sound waves that are sound waves that are applied from the ultrasonic application mechanism and that have not experienced reflection arrive at the convex curved part of the convex curved surface.

Process and device for cooling a steel strip (1) running through the cooling section (2) of a continuous line, whereby cooling is achieved by projecting the strip with an aqueous solution of formic acid with a concentration of formic acid between 0.1% and 6%, and preferably between 0.5% and 2%.

A method for the surface treatment of flat products made of aluminium alloys. The method includes pickling the flat product, in particular for degreasing the flat product. The method includes carrying out a colour measurement on the surface of the flat product to determine at least one measured colour value after pickling the flat product. The method includes generating output information on the basis of the at least one measured colour value. The output information is indicative of compliance with at least one rule for the measured colour value and outputting or triggering the output of the output information. The invention further relates to a device for the surface treatment of flat products made of aluminium alloys and to a use of a colorimeter which is configured to determine at least one measured colour value in a surface treatment of flat products made of aluminium alloys.

A rotating drum of a rotating drum-type workpiece cleaning device is provided with feed fins that extend helically along the inner circumferential surface of the drum body. The feed fins are, for example, fins in which metal sheets have been folded. On both sides of the feed fins, the angle of the internal corner between the feed fin and the inner circumferential surface of the drum body is an obtuse angle, for example, about 120 degrees. It is possible to prevent or limit the trapping of conveyed workpiece in the internal corner and trapping between adjacent fin sections.

Energy-efficient production of a ferritic hot-rolled strip (6) in an integrated casting-rolling plant (1), which modifies the known processes for producing a ferritic hot-rolled strip (6) in an integrated casting-rolling plant (1) so that the ferritic hot-rolled strip (6) can be produced significantly more energy-efficiently but nevertheless has good metallurgical properties and a good surface quality.

A process for secondary descaling of running metal strips, especially made of steel, during hot-rolling by-spraying water onto the surface of the running metal strips with spray rails having nozzles supplied with pressurized water, wherein the nozzles are supplied at a hydraulic pressure of from 3 to 30 bar, and wherein the nozzles are regulated so that heat flux density extracted from the strip (HF) resulting from the cooling of its surface by the sprayed water is between 6.5 and 20 MW/m.sup.2 for a strip temperature between 900 and 1100 C.

A flexible substrate treatment device comprising at least one tank that accommodates treatment liquid, winding rollers including a main roller and a driven roller located above the treatment liquid, a positioning roller located in the treating liquid in each tank, a detecting unit configured to detect radius or diameter of at least one of the winding rollers, and a movable discharge member fixed to a side wall of each tank, including a movable discharge port configured to discharge the treatment liquid and a discharge port position controlling mechanism, wherein the movable discharge port can be moved in a direction X perpendicular to a bottom wall of the tank.

The present invention is a washing assembly having at least one washing chamber at which at least one sheet metal passing through for producing copper-coated double-layer steel pipe. The washing assembly comprises at least one pair of wiper pair accommodated by the washing chamber.

The present invention is a washing assembly having at least one washing chamber at which at least one sheet metal passing through for producing copper-coated double-layer steel pipe. The washing assembly comprises at least one pair of wiper pair accommodated by the washing chamber.