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Development of metallurgy in Russia and other CIS countries
ArticleName Usage of aluminium gas-thermal coating for decrease of metal and heat losses in hot rolling
ArticleAuthor A. G. Radyuk, A. E. Titlyanov.

A. G. Radyuk, Dr. Eng., Prof., Chief Researcher; A. E. Titlyanov, Ph.D., Senior Researcher, Chair of Technology and Pipe Production Equipment, MISIS, Russia;


At the present time in Russia and abroad some experience in the application of gas-thermal coatings (GTC) have been accumulated to improve the metallurgical industry. The chair of Technology and Equipment of Tube Production (TOTP) of the National Research Technological University “Moscow Institute of Steel and Alloys” (NITU “MISIS”) investigated the effectiveness of GTC in hot rolling. Considered method of applying GTC using electric arc metallization is the most simple and efficient. The authors have studied possibility of using aluminum to enhance GTC for hot-rolled steel, copper and titanium pieces: reduction of metal loss with the fumes, dross and trimmings, reduction of heat loss peal. Following results were obtained. Metal loss on waste and dross on slabs of low-alloy steel with an aluminum GTC applied by electric plating, were 2.1–7.8 kg/t. It is less than that for slabs without coating. Expense ratio decreased from 1.195 to 1.152. On steel billets obtained from hot-rolled steel, varietal, coated, carbon-free layer was absent or its thickness was less than that without coating. Aluminum GTC applied to the surface of the slab of low-alloy steel is an effective material for reducing thickness of the rolled-in scale (up to 5 times) and the depth and number of surface cracks on the sheets. The coating on strips along the edges of adjacent wide and narrow sides eliminates appearance of cracks on the surface of overcooled edge zones of plates and align the mechanical properties along their length. Application of aluminum coating thickness of 150 mcm by electric plating on copper billets is an effective method of protection against fumes and scaling during heating to 900 оC and subsequent hot rolling. In the process of hot rolling, Cu–Al diffusion layer is not destroyed and deformed with the substrate. Pre-compaction is caused by hot rolling of billet with aluminum GTC before heating and increases its protective properties. Application of GTC on the aluminum billet of titanium alloy PT-3V reduces heat transfer from the surface of rolls during hot rolling. Application of reflective screens, in which compacted aluminum GTC was used as reflective layer in the area of intermediate rolling group of hot rolling mills showed their high efficiency to keep rolled sheet warm.

keywords Gas-thermal coating, metal losses, heat losses, hot rolling, low-alloy steels, aluminium, pre-compaction, reflective screens

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