National University of Science and Technology “MISiS” (Moscow, Russia):

A. A. Gerasimova, Cand. Eng., Ass. Prof.
A. G. Radyuk, Dr. Eng., Leading Scientific Fellow, e-mail: radjuk@rambler.ru

The paper considers the coating of the work surface of the narrow walls of the mold using thermal spray coating way to improve the quality of produced billets. Experimental studies showed that thermal spray coating of the entire work surface of the narrow walls of the mold reduces the number of longitudinal, transverse and reticular cracks on the slab surface improving the metal yield. Metallographic analysis of the billets carved from narrow edges of the slabs after latest melting, which were casted using normal and experimental mold, indicated, that reticular cracks occupied 0,1 and 6,6 % of billets, respectively. It was proved experimentally, that the coating leads to a decrease in the longitudinal, transverse and reticular cracks on the slab surface, which increases the yield in the subsequent rolling billets. To improve the quality of the slab surface is advisable to make thermal spray coating of the work surface of the walls of CCM.

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