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.

The device has a short production line, and all components are reasonably configured. A multifunctional cooling control device is adopted to integrate high-pressure water descaling and intermediate billet cooling functions, which is simpler and more efficient. Layout of a 4R+(3−4)F rolling mill, four thermos-detectors and short-distance underground coilers are use. The method includes the steps: carrying out continuous casting to manufacture a slab, high-pressure water rotating descaling, rough rolling by a four-stand high reduction rough rolling unit, machining by a drum shear, cooling after high-pressure water descaling in the multifunctional cooling control device, finish rolling by a three-stand or four-stand finish rolling unit, air cooling, dividing coils by a high-speed flying shear, and coiling by underground coilers, wherein temperature monitoring is respectively carried out after rough rolling, before finish rolling, after finish rolling, and before coiling by the underground coiler.

The device has a short production line, and all components are reasonably configured. A multifunctional cooling control device is adopted to integrate high-pressure water descaling and intermediate billet cooling functions, which is simpler and more efficient. Layout of a 4R+(3−4)F rolling mill, four thermos-detectors and short-distance underground coilers are use. The method includes the steps: carrying out continuous casting to manufacture a slab, high-pressure water rotating descaling, rough rolling by a four-stand high reduction rough rolling unit, machining by a drum shear, cooling after high-pressure water descaling in the multifunctional cooling control device, finish rolling by a three-stand or four-stand finish rolling unit, air cooling, dividing coils by a high-speed flying shear, and coiling by underground coilers, wherein temperature monitoring is respectively carried out after rough rolling, before finish rolling, after finish rolling, and before coiling by the underground coiler.

A spray nozzle assembly for directing thin, straight line, high pressure liquid spray onto moving steel slabs for penetrating and removing scale buildup in steel processing operations. The spray nozzle assembly includes a liquid inlet defined by an upstream strainer and a downstream high impact attachment tube for accelerating liquid flow. A one-piece multi-stage liquid straightening vane segment is disposed within a central liquid flow passage of the nozzle assembly for more effectively reducing liquid turbulence of the high pressure liquid flow with resultant improved control in the tightness of the thin, flat spray panner. The one-piece vane segment further is adapted for efficient assembly and replacement in the spray nozzle assembly without the need for handling and precise alignment of a plurality of individual vane elements.

A method for producing a metal article, in particular a slab, a pre-strip, a strip, or a sheet, in which the article is first conveyed in the conveying direction through a scale washer and then through a rolling mill, wherein the rolling mill has at least one roll stand, in particular a first roll stand in the conveying direction. The article is subjected in the scale washer to at least one upper row of nozzles, which descales the upper side of the article, and to at least one lower row of nozzles, which descales the lower side of the article.

A method for producing a metal article, in particular a slab, a pre-strip, a strip, or a sheet, in which the article is first conveyed in the conveying direction through a scale washer and then through a rolling mill, wherein the rolling mill has at least one roll stand, in particular a first roll stand in the conveying direction. The article is subjected in the scale washer to at least one upper row of nozzles, which descales the upper side of the article, and to at least one lower row of nozzles, which descales the lower side of the article.

Provided is an ultra high-strength hot-rolled steel sheet, having tensile strength of 800 MPa, and a method for manufacture same, the method enabling excellent surface quality, workability, weldability as well as significantly reduced deviation of the mechanical property in the width and length directions of the steel sheet by means of an endless rolling mode in a continuous casting-direct rolling process.

A nozzle head for descaling rolling stock, said rolling stock moving relative to said nozzle head, is adapted to be mounted for rotation about an axis of rotation relative to a surface of said rolling stock. Said nozzle head comprises a plurality of nozzles adapted to spray a liquid on said rolling stock, wherein said nozzles are positioned at different radial distances from said axis of rotation.

A nozzle head for descaling rolling stock, said rolling stock moving relative to said nozzle head, is adapted to be mounted for rotation about an axis of rotation relative to a surface of said rolling stock. Said nozzle head comprises a plurality of nozzles adapted to spray a liquid on said rolling stock, wherein said nozzles are positioned at different radial distances from said axis of rotation.

Device and method for descaling a workpiece that is in motion in relation to the device in a movement direction. The device includes a rotor head rotatable about a rotational axis and inclined diagonally at an angle (Y) with respect to an orthogonal on a surface of the workpiece. The device includes jet nozzles attached to the rotor head which dispense a pressurized liquid onto the workpiece at an angle of attack (α) inclined to the workpiece surface. The nozzles are fixedly attached on the rotor head such that during rotation of the rotor head about its axis of rotation, the spraying direction of the liquid dispensed from the nozzles with respect to a projection in a plane parallel to the surface of the workpiece, is aligned opposing to and at a spraying angle (β) of approximately between 170 and 190 degrees to the movement direction of the workpiece.