Method and device for refining or descaling thin slabs and strips in hot strip mills, strip treatment installations or the like
A technology for descaling and stripping, applied in cleaning methods and appliances, workpiece cleaning devices, workpiece surface treatment equipment, etc., can solve the problems of laborious, inability to switch to hot rolling and strip surface treatment, etc., and achieve less energy consumption , Inhibition of re-formation, and productivity-enhancing effects
Inactive Publication Date: 2008-08-27
SMS DEMAG AG
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Problems solved by technology
But the process is laborious and not necessarily environmentally friendly due to the use of acid baths
[0004] However, in document DE 199 53 230 C2 a cold rolling method is described, in which an inert gas having a temperature below room temperature is blown in the region of the nip instead of the cooling liquid, the temperature of the inert gas being lower than that of the rolling mill in the nip. The temperature of the workpiece, and WO 02 / 087803 discloses a method and device similar to the delivery of inert gas to the vicinity of the nip of the rolls during cold rolling; but the situation during cold rolling cannot be transferred to hot rolling and on the surface treatment of the strip
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[0038] Possible installation positions of a descaling unit with liquid gas in a strip plant are as follows:
[0039] 1. As a supplementary device for the segment straightening machine. That is to install nozzles in the segment straightening machine or directly on the segment straightening machine. Since the extraction device is already installed here, the installation location described can also be used for retrofitting.
[0040] 2. The descaling unit with liquid gas can even replace the segment leveling machine as a "stand-alone" application.
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The invention relates to a method for refining or descaling thin slabs and rolled strips in a hot strip mill. Said method is characterized by using cryogens such as nitrogen or a compound formed by cryogens with a carrier medium such as pressurized air, which are sprayed onto the slab surface or onto the strip surface in liquid and deep-frozen form. The invention also relates to a method for refining or descaling strips of a strip treatment installation having the characterizing features and to a corresponding device.
Description
technical field [0001] The invention relates to a method for cleaning or descaling sheets and strips in hot strip rolling mills, strip treatment plants and the like and to a device for carrying out the method. Background technique [0002] During hot rolling in a hot strip rolling mill, the slab or strip is often scaled as it is conveyed through the furnace and rolling train. These scales (mill scale) are usually removed by means of scale cleaning equipment before rolling. Here, high-pressure water (approximately 200 to 300 bar) is sprayed onto the hot surface. Ingress of water, in addition to achieving the desired cleaning process, also leads to an undesired cooling of the strip. In rolling installations in which the casting machine is directly connected to the rolling train, ie rolling at the casting speed, this cooling effect is particularly disturbing because of the low conveying speed. [0003] In strip processing plants, mill scale is usually removed before rolling ...
Claims
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Patent Timeline
Login to View More IPC IPC(8): B21B45/04B21B45/02B08B7/00
CPCB08B7/0021B08B3/022B21B45/0269B21B45/0272B21B45/0275B21B45/0287B21B45/04B21B45/08C23G5/00
Inventor H-P·里希特H·罗泽S·克雷默W·蒂默博伊尔H·D·加布里尔J·塞德尔A·格雷默
Owner SMS DEMAG AG
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