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It is quite difficult to control the content of carbide-forming elements in the production of casting ‘pressure plate’ of gray pearlitic iron grade SCh25 (GOST 1412–85). Therefore, it is necessary to conduct research and analysis of foreign inclusions, the basis of which are ‘uncontrolled’ carbide formers. The analysis of the content of ‘uncontrolled’ carbide-forming elements on the formation of zones with an interdendritic distribution of graphite types D, E (ASTM A247) castings of a pressure plate is carried out. The elemental composition of impurity inclusions is determined. It has been established that ‘uncontrolled’ carbide-forming elements are represented in cast iron in complex carbide-nitride and sulfide-phosphide phases. A conclusion is drawn on the effect of carbide formers on the formation of areas with an interdendritic distribution of graphite. All types of these phases are concentrated to a greater extent within the zones of interdendritic distributions of lamellar graphite D and E. This indirectly confirms the influence of ‘uncontrolled’ carbide-forming elements on their formation.

Microstructure of impurity phase inclusions in gray cast iron and their composition