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The paper is concerned with the technological peculiarities of the production of copper sheet from CuNiSi alloy by the method of semi-continuous casting and subsequent stages of hot and cold rolling. Pouring defects which have an impact on the copper sheet quality are presented. There was shown that gas pores in a cast billet are among the main causes for appearance of defects in the copper sheets after rolling. The emphasis is placed on the influence of the secondary cooling rate of the melt in the crystallizer on the change in the size of the liquid phase. It has been established that increasing the cooling water flow rate leads to accelerated formation of a hard crust and a shift of the crystallization front up the casting axis. The established decrease in the depth of the liquid phase favors heat removal in the crystallizer and leads to the production of a casting with reduced porosity. In the work, a chemical analysis of the cast alloy was performed, the stages of subsequent thermo-mechanical treatment to obtain a copper sheet were traced, a visual and microscopic analysis of the defects observed after rolling was carried out. The quality of the copper sheets obtained by rolling billets crystallized at different secondary cooling rates was established by microstructural and mechanical tests. A technological regime of semi-continuous casting and rolling is proposed, in which a sustainable improved quality of the copper sheet is achieved.
Keywords: copper sheet, semi-continuous casting, secondary cooling, defects, mechanical tests© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.