Abstract
Refining issues of molten metal are still actual in modern conditions of foundry. In manufacturing process of ductile and vermicular graphite iron castings with required microstructure and mechanical properties one of the essential conditions is the control of sulfur content in the base iron. Increased sulfur concentration (over 0,02%) can destabilize the production process of ductile and vermicular graphite iron castings and decrease the efficiency of modifying treatment. An additional factor reducing the efficiency of modification, which is not mostly controlled and not taken into account in foundry is oxidation of cast iron; average content is 1200–1600 ppb depending on charge materials. In this regard, in the production of ductile castings, the stage of metal pretreatment in the furnace, which consists in refin-ing the metal from sulfur and oxygen, is important. The iron foundry factories do not often have the opportunity to buy the modern equipment for refinement of liquid metal due to its high cost. In this case, in addition to existing traditional methods of refining, it is interesting to use specially developed compositions of complex materials and modifiers, improvement of methods of their input into the liquid metal. A possible variant of metal pretreatment for subsequent modification was presented. The complex briquetted material Refloy®F based on ferrosilicon FS45 has in its composition such active elements as alkaline-earth and rare-earth metals. The chemical composition of briquette Refloy®F and mechanism of its influence on cast iron melt was presented and practical experience of its application was provided. The technology of introducing briquettes depending on applied smelting unit, its consumption characteristics, results of reduction of oxygen and sulfur concentration in pig iron in the course of tests at different plants are presented. The advantages of iron desulfurization technology with Refloy®F briquettes are provided.
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