Technology for producing cast iron castings with compact graphite by top filling

Abstract

The technology of ladle modification “top filling” has been tested and introduced to produce castings of parts from low grades of high-strength cast iron, in particular ChVG40, VCh50. The technology allows us to consistently achieve a degree of graphite spheroidization of at least 80%. For each of the mastered castings of the parts “Reduction gear axle casing”, “Front idler hub” and “Exhaust manifold”, the consumption of a spheroidizing modifier and a graphitizing modifier was selected. In the chemical composition of the castings, to obtain a predominantly ferrite-pearlite structure, the manganese content was adjusted from 0.4...0.5% to 0.3...0.4%.