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

A. A. Gerasimova

A. G. Radyuk, 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. 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. 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. 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. To improve the quality of the slab surface is advisable to make thermal spray coating of the work surface of the walls of CCM.

1. Radyuk A. G., Gorbatyuk S. M., Gerasimova A. A. Use of electric-arc metallization to recondition the work surfaces of the narrow walls of thickwalled slab molds. Metallurgist. 2011. Vol. 55. Nos. 5–6. p. 419–423.

2. Tsuprun A. Yu., Fedosov A. V., Skrebtsov A. M. et al. Analiz vliyaniya teplovogo sostoyaniya nepreryvnolitykh slyabov na porazhennost ikh poverkhnostnymi rebrovymi treshchinami (Analysis of the effect of thermal state of continuously cast slabs on their prevalence by surface rib cracks). Metallurgicheskie Protsessy i Oborudovanie = Metallurgical Processes and Equipment. 2012. № 3. p. 4–11.
3. Triolet N., Poelmans K., Mabeelly P. et al. Prevention of comer cracks in slab continuous casting. La Revue de Metallurgie. CIT. 2009. November. p. 508–516.
4. Parshin V. M., Busygin V. V., Chertov A. D. et al. Nepreryvnaya razlivka na slyabovye zagotovki v Rossii (Continuous casting of slab billets in Russia). Stal = Steel. 2009. № 8. p. 17–24.
5. Smirnov A. N., Tsuprun A. Yu., Shtepan E. V. et al. Analiz teplovoy raboty kristallizatora slyabovoy MNLZ (Analysis of mould thermal work at a slab conticaster). Stal = Steel. 2011. № 5. p. 19–21.
6. Berdnikov S. N., Pozin A. E., Podosyan A. A. et al. Rezultaty opytnoy ekspluatatsii novoy konstruktsii uzkikh stenok kristallizatora slyzbovykh MNLZ (The results of pilot operation pf the new construction of mould narrow walls at slab conticasters). Stal = Steel. 2011. № 5. p. 21–23.
7. Ushakov S. N., Zhelnin Yu. M., Alekseev A. G. et al. Rezultaty primeneniya kristallizatorov s uprochnyayushchim pokrytiem v slyabovoy MNLZ s vertikalnym uchastkom v elektrostaleplavilnom tsekhe OAO «MMK» (The results of application of the moulds with hardened coating in slab conticaster with vertical section in the electric steel melting shop at MMK JSC. Gornyi Zhurnal. Chernye Metally = Mining Journal. Ferrous Metals (Special issue). 2012. p. 49–50.
8. Gerasimova A. A., Radyuk A. G. Uluchshenie kachestva poverkhnosti slyabov putem naneseniya pokrytiya na uzkie stenki kristallizatora MNLZ (Improvement of slab surface quality via coating application of mould narrow walls in conticaster). Nauchnyi vestnik Norilskogo industrialnogo instituta. Nauchnoprakticheskiy zhurnal = Scientific bulletin of Norilsk Industrial Institute. Scientific and practical journal. 2013. № 13. p. 5–8.
9. Kuklev A. V., Aizin Yu. M., Makrushin A. A. et al. Rossiyskiy metod naneseniya pokrytiy na mednykh stenkakh slyabovykh kristallizatorov (Russian experience of application of coatings at copper walls of slab moulds). Stal = Steel. 2007. № 3. p. 17–18.