Abstract
	The article pursues the analysis of balance thickness of the magnesium-carbon refractory lining of basic oxygen furnace during the campaign. Permanent increase in steel production has substantial influence to the refractory materials consumption in the worldwide scale. Development and innovation of the technologies of steel production is reflected also in increase of the requirements for magnesium-carbon refractory materials for basic oxygen furnace linings. Technological methods used in steel production at the present put high requirements to the quality parameters of used refractory building materials. Specific methods proceeding during refining process of scrap material as quick temperatures alternation, changes in slag composition or impacts of heavy pieces of scrap material, influence destructively to the basic lining of basic oxygen furnace. From such reason the high accent is put to the charge of refractory lining during the campaign what is connected with permanent increase of gunning repair refractory materials consumption. Continual increase of refractory bricks quality leads to the prolongation of time of the basic oxygen furnace campaigns.