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Scale Formation and its Removal in Hot Rolling Process
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NSTL
During hot rolling of steel, its surface is exposed to air, which leads to oxidation, resulting in scale formation. The scale formation is affected by the temperature, steel grade, surrounding atmosphere and the exposure time. There are two kinds of scales relevant in rolling mills -sticky and dry scales. Sticky scales can be removed more effectively by the use of high pressure water jets up to 450 bar. Dry scales can be removed from the surface by application of descaling systems with low distances of the descaling nozzle to the material. Nozzle characteristics and spray header design play a major role in the performance of descaling system. The paper focuses on the recent innovations of descaling nozzles.
NSTL
