Abstract: The invention relates to a process for hot rolling and for heat treatment of a strip (1) of steel. To make it possible to produce high-strength and very high-strength strips having satisfactory toughnesses more economically in a continuous production plant, the process provides the steps: a) heating of the slab to be rolled; b) rolling of the slab to the desired strip thickness; c) cooling of the strip (1), with the strip (1) having a temperature above ambient temperature (T0) after cooling; d) rolling up of the strip (1) to produce a coil (2); e) rolling off of the strip (1) from the coil (2); f) heating of the strip (1); g) cooling of the strip (1) and h) transport of the strip (1) to a further destination, with the strip (1) having a temperature above ambient temperature (T0) before heating as per step T).

Abstract: A method for the detection and classification of surface defects on continuously cast products using topographical information about the appearance of continuously cast surface defects and/or flaws are determined with respect to their exact position, evaluated with respect to their location and dimensions, and eliminated in accordance with the evaluation prior to further machining of the product, or are prevented by optimizing the process. The defects and/or flaws on the slab surface of the continuously cast preliminary product are detected and are stored with respect to their exact position and a detection of defects and/or flaws on the finished product is carried out and stored with respect to their exact position, and in that the information from the preliminary product is then compared with the information from the surface inspection on the finished product.

Abstract: The invention relates to a method and a system for the production of hot-rolled strip silicon-alloy steel for further processing into grain-oriented sheets, such as electrical sheets, wherein a cast product, in this case a thin slab, for example, with a maximum thickness of 120 mm, is subjected to thermal pretreatment and to a subsequent rolling process on a hot-rolling line to set a desired recrystallization state. The invention proposes an intake temperature (Tin) of the cast product (2) into the hot-rolling line (9a or 9b) of at least 1200° C., and preferably in excess of 1250° C., which should be controlled during pretreatment by adding at least one preheating stage (3) and one intensive heating stage (6) to ensure the final rolling temperature (TFR).

Abstract: A method for producing hot-rolled strip from austenitic stainless steels. In a first step, a cast product is subjected to a rolling operation in a rolling mill with a finishing train, and, in a second step, a heat treatment is carried out to prevent susceptibility to corrosion, especially intergranular corrosion due to chromium carbide precipitation. To establish the final rolling temperature (Twe), a run-in temperature (Tein) of the cast product into the finishing train of the rolling mill that is above 1,150° C., and preferably above 1,200° C., is established by a multistage heating process, especially a two-stage heating process, which comprises a preheating stage and an intensive heating stage, and the heat treatment is carried out by directly utilizing the rolling heat.

Abstract: Disclosed is a method for removing loose scale and other foreign matter from the top and/or bottom face of a cast product (3), such as a slab, thin slab, profiled element, or similar, with the aid of flowable media which are sprayed onto the cast product (3) by means of a cleaning device (5) comprising at least one spraying apparatus (8, 9) that is disposed above the cast product (3) and at least one spraying apparatus (8, 9) that is arranged below the cast product (3). According to said method, the amount of media and/or the effective width and/or the pressure of the media is/are controlled separately and independently of time for each spraying apparatus (8, 9).

Abstract: Compared to conventional steel products, polyphase steels have a significantly improved combination of resistance and ductility and are therefore becoming more and more important—especially for the automobile industry. The currently most important steel groups for the automobile industry are dual phase steels and TRIP steels. The production of different polyphase steel resistance categories, carried out directly on a hot strip, for meeting various requirements, requires a highly extensive know-how and firstly a corresponding adaptation of the alloy elements. According to the invention, a heat treatment (30) with a variable heating temperature and heating duration is carried out following the actual production of polyphase steels with a standard analysis and a standard process execution, whereby almost any combination of different materials or combination of properties (height of yield stress, level of tensile strength) can be adjusted.

Abstract: The invention relates to a method for the continuous casting of slab, thin slab, bloom, preliminary section, round section, tubular section or billet strands (1) and the like from liquid metal in a continuous casting plant (2) in which metal discharges perpendicularly downwards from a mould (3), wherein the metal strip (1) is then guided vertically downwards along a perpendicular strand guide (4) and is cooled in the process, wherein the metal strip (1) is then deflected from the vertical direction (V) into the horizontal direction (H) and wherein mechanical forming (5) of the metal strip (1) is effected in the final region of the deflection into the horizontal direction (H) or after the deflection into the horizontal direction (H).

Abstract: An oscillating device for continuous casting molds (1) for casting molten metal particularly, molten steel material includes a plurality of springs (5) or spring assemblies (5a) extending between a stationary mold frame (2) and connection or fixing points (4) for supporting a continuous casting mold (1) and are set in control oscillations such as, e.g., resonance oscillations by drive pairs, wherein by using of springs (5), spring assemblies (5a) or spring bundles (5b) formed of fiber composites (6), damaging corrosion by chemicals during continuous casting is prevented.

Abstract: A method for producing hot-rolled strip from austenitic stainless steels includes, in a first step, subjecting a cast product (6) to a rolling operation in a rolling mill with a finishing train and, in a second step, carrying out a heat treatment to prevent susceptibility to corrosion, especially intergranular corrosion due to chromium carbide precipitation. To establish the final rolling temperature (Twe), a run-in temperature (Tein) of the cast product into the finishing train of the rolling mill that is above 1,150° C., and preferably above 1,200° C., is established by a multistage heating process, especially a two-stage heating process, which includes a preheating stage and an intensive heating stage, and the heat treatment is carried out by directly exploiting the rolling heat.

Abstract: An oscillating device for continuous casting molds (1) for casting molten metal particularly, molten steel material includes a plurality of springs (5) or spring assemblies (5a) extending between a stationary mold frame (2) and connection or fixing points (4) for supporting a continuous casting mold (1) and are set in control oscillations such as, e.g., resonance oscillations by drive pairs, wherein by using of springs (5), spring assemblies (5a) or spring bundles (5b) formed of fiber composites (6), damaging corrosion by chemicals during continuous casting is prevented.

Abstract: The invention relates to a method for producing rolled products from austenitic rust-resistant steels. In a first step, a product to be cast (6) is subjected to a rolling process in a rolling mill (13), and in a second step, said product is subjected to heat treatment for preventing susceptibility to corrosion, especially inter-crystalline corrosion caused by chrome carbide precipitation. The aim of the invention is to render the inventive method more cost-effective and energy-saving. To this end, the rolling heat is directly exploited for the heat treatment for preventing susceptibility to corrosion. The invention also relates to a corresponding installation.

Abstract: The invention relates to a device for removing loose cinder from the surface of a slab, especially a thin slab of a mini mill. One such mini mill comprises at least one slab casting machine, a slab separating device, a thermal compensation furnace and at least one roll stand comprising a reeling installation. The inventive device is improved in that a spray device (11) comprises at least one lower spray pipe (2) and at least one upper spray pipe (3) in relation to the slab (1), each spray pipe being fitted with a number of spray nozzles (4). Said spray device (11) is arranged in front of the roller hearth furnace (5) of the mini mill and is connected to a water supply (6) having the technologically required pressure and a volume flow which is adapted to the number of spray nozzles (4). The invention also relates to an operating method for the spray device (11).

Abstract: A method of improving the surface quality of a continuously cast slab, particularly a thin slab having a maximum cast thickness of 100 mm, wherein the slab is covered with a casting slag film and a layer of scale, and wherein the slab is descaled after casting and is rolled in a finishing train. A reaction agent, which is different from water, is applied onto the slab prior to descaling or during descaling. The application of the reaction agent may be preceded by a conventional hydraulic, mechanical or pneumatic removal of the layer of scale which covers the slab.