Provided are a method and a device for descaling that make it possible to effectively remove oxide scale from the surface of a metal wire. The descaling includes spraying the surface of a metal wire (W) with a mixture (9) of water and hard particles from a plurality of nozzles (8). The plurality of nozzles (8) include a plurality of self-cleaning nozzles that spray at a spray angle () of 90 or smaller with respect to the metal wire (W). The spray angle () is the angle formed by the central axis (X) of the spraying and a vector (Vt) indicating a conveyance direction that originates at the intersection (P) of the central axis (X) and the metal wire surface.

A process for forming a descaling composition has the steps of macerating a bone meal with a dimethylamine solution, digesting the macerated bone meal with hydrochloric acid, neutralizing the digested bone meal with calcium oxide, treating the neutralized bone meal with sulfuric acid, and applying a refluxing treatment with dimethylamine and hydrazine hydrate. The process further includes removing the macerated bone meal solids from the dimethylamine solution and transferring the removed solids to an extraction tower prior to the step of digesting. The hydrochloric acid is circulated through the macerated bone meal. The treated bone meal and the sulfuric acid is filtered so as to produce a liquid phase and a solids phase. The liquid phase contains a phosphate amine. The dimethylamine and hydrazine hydrate are added to the liquid phase.

A process for forming a descaling composition has the steps of macerating a bone meal with a dimethylamine solution, digesting the macerated bone meal with hydrochloric acid, neutralizing the digested bone meal with calcium oxide, treating the neutralized bone meal with sulfuric acid, and applying a refluxing treatment with dimethylamine and hydrazine hydrate. The process further includes removing the macerated bone meal solids from the dimethylamine solution and transferring the removed solids to an extraction tower prior to the step of digesting. The hydrochloric acid is circulated through the macerated bone meal. The treated bone meal and the sulfuric acid is filtered so as to produce a liquid phase and a solids phase. The liquid phase contains a phosphate amine. The dimethylamine and hydrazine hydrate are added to the liquid phase.

A descaling device having a device housing, a shaft, a shaft bearing, a nozzle head and a medium coupling, wherein the shaft bearing is arranged in the device housing and the shaft is mounted in the device housing by the shaft bearing for carrying out a rotary movement, wherein the shaft and the nozzle head are detachably connected to one another in a non-destructive manner, wherein the medium coupling has a medium connection for supply of a medium, wherein the shaft has a shaft cavity for conducting the medium supplied at the medium connection to the nozzle head. The descaling device has an improved maintainability and reliability due to the descaling device having a motor, and due to the motor being arranged on the shaft in the device housing between the nozzle head and the medium coupling in order to generate the rotary movement of the shaft.

A descaling device having a device housing, a shaft, a shaft bearing, a nozzle head and a medium coupling, wherein the shaft bearing is arranged in the device housing and the shaft is mounted in the device housing by the shaft bearing for carrying out a rotary movement, wherein the shaft and the nozzle head are detachably connected to one another in a non-destructive manner, wherein the medium coupling has a medium connection for supply of a medium, wherein the shaft has a shaft cavity for conducting the medium supplied at the medium connection to the nozzle head. The descaling device has an improved maintainability and reliability due to the descaling device having a motor, and due to the motor being arranged on the shaft in the device housing between the nozzle head and the medium coupling in order to generate the rotary movement of the shaft.

A plant and process for the continuous production of hot-rolled steel strips with a minimum thickness of 0.3 mm is disclosed which includes a continuous casting device of thin or medium slabs with a thickness between 40 and 150 mm and a maximum width of at least 2100 mm followed by a roughing mill, a first induction furnace, a water descaler, a second induction furnace, a finishing mill, a cooling station, a cutting station and a winding station. A system for feeding a protective atmosphere containing ?3% vol. oxygen is provided from the inlet of the second induction furnace to at least the third stand of the finishing mill. Between the continuous casting device and the roughing mill, an initial thermal conditioning and descaling section is provided having in sequence an induction edge heater, an induction heater for the rest of the slab surface and a water descaler.

A process for forming a descaling composition has the steps of macerating a bone meal with a dimethylamine solution, digesting the macerated bone meal with hydrochloric acid, neutralizing the digested bone meal with calcium oxide, treating the neutralized bone meal with sulfuric acid, and applying a refluxing treatment with dimethylamine and hydrazine hydrate. The process further includes removing the macerated bone meal solids from the dimethylamine solution and transferring the removed solids to an extraction tower prior to the step of digesting. The hydrochloric acid is circulated through the macerated bone meal. The treated bone meal and the sulfuric acid is filtered so as to produce a liquid phase and a solids phase. The liquid phase contains a phosphate amine. The dimethylamine and hydrazine hydrate are added to the liquid phase.

A filter jet-director unit for a high-pressure nozzle for descaling metal products, having a housing, wherein the housing has an entry filter, a connector end for connecting to a nozzle, a flow duct between the entry filter and the connector end, and a jet director having flow-guiding faces in the flow duct. The flow-guiding faces of the jet director at least in portions are disposed in the region of the entry filter.

A filter jet-director unit for a high-pressure nozzle for descaling metal products, having a housing, wherein the housing has an entry filter, a connector end for connecting to a nozzle, a flow duct between the entry filter and the connector end, and a jet director having flow-guiding faces in the flow duct. The flow-guiding faces of the jet director at least in portions are disposed in the region of the entry filter.

The invention provides an endless rolling method based on temperature uniformity control, and belongs to the field of iron and steel metallurgy. By optimizing the process path, a new layout mode is adopted, a double heat storage soaking furnace and a descaling box are additionally arranged, transverse and longitudinal bonding magnetic induction heating device is adopted, transverse and longitudinal temperature uniform of the slab in the rolling process is realized, the cross section temperature difference is reduced, and the product quality is improved. On the basis of five-stand arrangement of a traditional finish rolling mill, a rolling mill is additionally arranged to serve as a standby rolling mill, such that on-line non-shutdown change roller of the finish rolling mill is realized. The method of the invention realizes a full-continuous production of production and meets the high-quality development requirements of iron and steel metallurgy, such that traditional cool rolling can be replaced with hot rolling, traditional thick-specification strip can be replaced with high-added-value thin specification strip. There is important significance in the aspects of productivity optimization layout, green manufacturing, intelligent manufacturing and the like.