Abstract:
A method for rolling thin and/or thick slabs made of steel materials into hot-rolled strip, which were previously cast as thin or thick slabs in a continuous casting machine, heated to rolling temperature in a pusher furnace or in a walking-beam furnace, and rolled in a common rolling train, then cooled and wound into coils. The method is carried out in a continuous manner at maximum capacity of the roughing train according to the quality standard of the hot-rolled strip while roller wear is reduced due to the fact that the roughing train is formed inline by roughing stands and finishing stands into which thin slab sections or thick slab sections are introduced at a suitable point of the roughing train according to the thickness thereof.
Abstract:
A continuous hot rolling method includes setting operating conditions (OC) for hot rolling facilities, regarding rolled material for which endless rolling was planned, in which a preceding piece of material and a subsequent piece of material are joined to each other, to batch rolling, in which rolling is performed without joining the preceding piece of material and subsequent piece of material to each other, or setting of changes from batch rolling to endless rolling. Changes can be speedily and accurately made, so that operating problems, or defective coils due to inaccurate changes in settings or delays in changing the settings can be prevented. Both the operating conditions (OCIe) for endless rolling and the operating conditions (OCIb) for batch rolling are predetermined, and the operating conditions (OCe,OCb) for the facilities at various positions on the hot rolling line are determined for both endless rolling and for batch rolling.
Abstract:
A rolling method in a rolling line, to obtain strip with a thickness varying from 0.7 mm to 20 mm, for steel which can be cast in the form of thin slabs with a thickness from 30 mm to 140 mm, the line includes a continuous casting device; a tunnel furnace for maintenance/equalization and possible heating; a rolling train having a roughing train and a finishing train; a rapid heating unit, with elements able to be selectively activated, interposed between the roughing train and the finishing train. For each lay-out of the rolling line, the position of the rapid heating unit which defines the number of stands which form the roughing train, disposed upstream of the unit, and the number of stands which form the finishing train, disposed downstream of the unit, is calculated as a function of the product of the thickness and speed of the thin slab.
Abstract:
Disclosed is a method for milling thin and/or thick slabs (2; 3) made of steel materials into hot-rolled strip (4a). Said slabs are first cast as thin or thick slabs (2; 3) in a continuous casting machine (1), are heated to a milling temperature in a tunnel furnace (5) or walking beam furnace (7), are milled in a mill train (4), and are then chilled and rolled up into coils (18). Said method can be carried out in a largely continuous manner at maximum capacity of the mill train (4) according to the quality standard of the hot-rolled strip (4a) while roller wear is reduced due to the fact that the mill train (4) is formed inline by roughing stands (4c) and finishing stands (4b) into which thin slab sections (2b) or thick slab sections (3b) are introduced at a suitable point of the mill train according to the thickness thereof.
Abstract:
The present invention eliminates the need to stop the operation of a line even when trouble arises before, during, or after an operation of joining metal blocks in hot rolling. According to a specific solving means of the present invention, when a succeeding metal block is to be subjected to hot finish rolling in succession to a preceding metal block after the leading end of the succeeding metal block is joined to a tail end 10B of the preceding metal block on the inlet side of a finish rolling mill 26, it is determined before and after joining whether or not endless rolling is impossible. When it is impossible, joining is aborted, and the succeeding metal block 12 is temporarily stopped, is fed again after the tail end 10B of the preceding metal block moves out of the finish rolling mill 26, and is finish-rolled under the conditions set for batch rolling. When joining was not performed successfully, a joint 11 is cut between a joining unit and the finish rolling mill 26, and the rolled material is bitten by the finish rolling mill set for batch rolling.
Abstract:
Die Erfindung betrifft eine Vorrichtung zum Reibverschweißen warmer metallischer Produkte wie Bänder und/oder Brammen, insbesondere Dünnbrammen, umfassend eine Fördereinrichtung für mindestens zwei hintereinander angeordnete Bänder und/oder Brammen (i, i+1) und eine Andrückvorrichtung zum Andrücken des Kopfes des nacheilenden Bandes und/oder der Bramme (i+1) an das Ende des voreilenden Bandes und/oder der Bramme (i), dadurch gekennzeichnet, dass die Andrückvorrichtung ein Losteil (L) und ein Festteil (F) oder zwei Losteile (L) aufweisen und zum Fixieren der Kontaktflächen der Bänder und/oder Brammen (i, i+1) zueinander dient, wobei das Losteil (L) gegenüber dem Festteil (F) oder zwei Losteile (L) gegeneinander so in Vibration versetzt werden können, dass die zwei hintereinander angeordneten Bänder und/oder Brammen (i, i+1) miteinander unter Einfluss der Reibenergie zwischen den Kontaktflächen und unter aufgebrachten definierten Druck verschweißbar sind. Des Weiteren betrifft die Erfindung ein Verfahren zum Reibverschweißen warmer metallischer Produkte wie Bänder und/oder Brammen, insbesondere Dünnbrammen, umfassend die Schritte des Förderns von zwei hintereinander angeordneten Bändern und/oder Brammen (i, i+1) zu einer Andrückvorrichtung, Entzunderns zumindest der Kontaktflächen der miteinander zu verbindenden Bänder und/oder Brammen (i, i+1), Andrückens des Kopfes des nacheilenden Bandes und/oder der Bramme (i+1) an das Ende des vorauseilenden Bandes und/oder der Bramme (i), sowie des relativen Bewegens der Kontaktflächen zueinander mit vorab festgelegter Schwingungsfrequenz und -amplitude sowie unter vorab festgelegtem Druck oder/und zeitlich variablem Druckverlauf zum Aufbringen der Reibenergie, Fixierens der Kontaktflächen der Bänder und/oder Brammen (i, i+1) zueinander und Aufbringen eines definierten Drucks, sodass die zwei hintereinander angeordneten Bänder und/oder Brammen (i, i+1) miteinander zwischen den Kontaktflächen reibverschweißt werden.
Abstract:
Rolling method in a rolling line (10), to produce strip with a thickness varying from 0.7 mm to 20 mm, for all qualities of steel which can be cast in the form of thin slabs with a thickness comprised from 30 mm to 140 mm, the line (10) comprising at least: a continuous casting device (1 1); a tunnel furnace (15) for maintenance/equalization and possible heating; a rolling train consisting of a roughing train comprising from 1 to 4 rolling stands (18a, 18b, 18c) and a finishing train comprising from 3 to 7 stands (21a-21e); a rapid heating unit (20), with elements able to be selectively activated, interposed between the roughing train and the finishing train. For each lay-out of the rolling line (10), the position of the rapid heating unit (20) which defines the number of stands (18a, 18b, 18c) which form the roughing train, disposed upstream of the unit (20), and the number of stands (21a-21e) which form the finishing train, disposed downstream of the unit (20), is calculated as a function of the product of the thickness and speed of the thin slab. The product is in turn a function of the hourly productivity in tons/hour desired to be obtained, and is made to work either in coil-to-coil mode, or in semi-endless mode or in endless mode. One of the three modes of the rolling process is selected according to the quality of the steel produced, to the maximum casting speed possible for the quality of steel, to the final thickness of the strip and to the production cost.
Abstract:
The present invention provides continuous casting-milling equipment and method capable of switching between continuous and batch milling, which increase the process yield rate by reducing the portion which is unavoidably processed as scrap, when switching casting or at an initial stage. The continuous casting-milling equipment comprises: a casting unit; at least two rolling units; and a coil box arranged between the rolling units. The continuous casting-milling method comprises: a casting step for producing a slab; a first rolling step which reduces the thickness of the slab; a cutting step of cutting a predetermined distance from a front end portion of the slab at the initial stage of casting; a passing step of passing the continuously supplied slab through the coil box; and a second rolling step which reduces the thickness of the passed slab.