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THE STUDY OF SYNTHETIC CAST IRON QUALITY MADE FROM STEEL SCRAP

Peter Futáš

Abstract

Cast iron, the oldest type of ferrous material for injection molding is also currently the most widely used material in foundries. In particular, this good technological properties (excellent fluidity, low tendency to shrinkage and their formation, low propensity for stress) as well as acceptable mechanical properties and good workability. Similarly, its physical properties and prefer it allows to produce castings with excellent specific characteristics, particularly heat and heat resistant, wear resistant and castings with special physical properties. Disadvantage of grey iron is its high fragility. This feature is designed production of spheroidal graphite cast iron. Another drawback is the relatively high variance properties, in particular mechanical, even in the stable composition. Synthetic iron i.e. made of cast iron steel scrap has been known for more than 60 years. Its production has enabled the development of sleeve-type electric induction furnaces (EIF). These furnaces represent progress in the process of melting and Metallurgy liquid metal, in particular compared to traditional cast iron in the cupola furnace. Besides using increased to 100% - intercom share of cheaper steel scrap, the main benefit EIF is the possibility of producing liquid metal with exact chemical composition and the possibility of widespread doping and high required overheating. Significant environmental aspects are also melting in the EIF. Early on in the production of synthetic iron have been charged above the mechanical properties (Rm, and HB) at the same degree of saturation (Sc) in comparison with cast iron produced with a high proportion of expensive foundry pig iron. This recognition is construed as the effect of high nitrogen content of the steel, although has not yet been verified in practice. The increase in mechanical properties of cast iron (on average about 20%) is often preferred in practice. The reduction is practiced to increase the degree of saturation cast iron. Recently, however, the practice has shown further changes and technological properties of synthetic iron, especially higher propensity for hard spots, brittleness, shrinkages,stress and higher sensitivity irons unlike hardness at different wall thickness castings. These negative findings recorded especially for heavy thick-walled castings of cast irons with a higher strength and toughness. It is characterized by acceptable mechanical properties, excellent foundry characteristics and favorable physical properties. In contribution are presented results research work relating to influence of charge materials on cast iron properties.

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DOI resolver: doi.org/10.5593/sgem2018/4.2/s18.028

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