137 results about "Hot strip mill" patented technology

A hot rolling mill and method for operating the hot rolling mill where the shape of the strip is controlled by localized cooling devices positioned at intervals along work rolls in at least three lateral zones, a central and two edge zones, and capable of separately cooling each zone to control the shape of the work rolls in that zone and inhibit the formation of shape defects occurring in the strip being rolled. Five zones may be provided across the work surface of the work rolls so that two intermediate zones can control for quarter buckles. The hot rolling mill has particular application in continuously casting thin strip. The method can be made automatic by sensing downstream of the hot mill the shape of the strip in each zone.

In hot strip plants the residual heat of a part of the slabs after casting was hitherto utilized by either directly rolling the slabs or inserting the slabs into the furnace in a still warm or hot state. After casting, the remaining slabs usually cool down in an aerated hall and are stacked before being further conveyed. The same applies to the residual heat which is present after coiling in the coils which are often air-cooled in a coil storage. The cooling energy of the continuous casting plant also escapes into the environment without being utilized.; According to the invention said unutilized solidification and residual heat is converted into electrical energy by casting the slabs (10) in a continuous casting plant, conveying the slabs (10) or coils to the slab storage (12) or coil storage, removing heat therefrom in heat exchangers (31) during casting and / or during conveying, and / or placing the slabs for a short time or for several hours partially stacked on specifically prepared storage areas (30) which are designed with heat exchangers (31), wherein during the conveying period the heat of the cast strand or the slab (10) and / or during the storage period the residual heat of the slabs (10) or coils is transferred by means of heat conduction and heat radiation and convection via the heat exchangers (31) to a heat carrying medium, such as thermal oil,; thereby heating the heat carrying medium which is then removed via heat carrier transport ducts (33) for power generation and / or for direct utilization of the process heat in other heat consumers.

A thin cast strip is formed having at least one microstructure selected from the group consisting of polygonal ferrite, acicular ferrite, Widmanstatten, bainite and martinsite, a surface roughness of less than 1.5 microns Ra and a scale thickness of less than about 10 microns by applying a mixture of water and oil on the work rolls of the hot rolling mill, passing the thin cast strip at a temperature of less than 1100 DEG C through the hot rolling mill while the mixture of oil and water is applied to the work rolls, and shrouding the thin cast strip from the casting rolls through the hot rolling mill in an atmosphere of less than 5 % oxygen to form the thin cast strip.