Melting of Grey Cast Iron Based on Steel Scrap Using Silicon Carbide

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Abstract

The paper presents the issue of synthetic cast iron production in the electric induction furnace exclusively on the steel scrap base. Silicon carbide and synthetic graphite were used as carburizers. The carburizers were introduced with solid charge or added on the liquid metal surface. The chemical analysis of the produced cast iron, the carburization efficiency and microstructure features were presented in the paper. It was stated that ferrosilicon can be replaced by silicon carbide during the synthetic cast iron melting process. However, due to its chemical composition (30% C and 70% Si) which causes significant silicon content in iron increase, the carbon deficit can be partly compensated by the carburizer introduction. Moreover it was shown that the best carbon and silicon assimilation rate is obtained where the silicon carbide is being introduced together with solid charge. When it is thrown onto liquid alloy surface the efficiency of the process is almost two times less and the melting process lasts dozen minutes long. The microstructure of the cast iron produced with the silicon carbide shows more bulky graphite flakes than inside the microstructure of cast iron produced on the pig iron base.

[1] Janerka, K. (2010). Carburization of liquid ferro-alloys. Gliwice: Ed. Silesian University of Technology. (in Polish).

[2] Janerka, K., Bartocha, D., Jezierski J. & Szajnar, J. (2010). The effect of the carburiser quality on the cast iron recarburisation process. Foundry Trade Journal International. 184(3679), 282-286.

[3] Janerka, K., Bartocha, D. & Szajnar, J. (2009). Quality of carburizers and its influence of carburization process. Archives of Foundry Engineering. 9(3), 249-254.

[4] Janerka, K., Bartocha, D., Szajnar, J. & Cholewa, M. (2007). The influence of different kind of carburizers and carburization on the effectiveness and iron structure. Archives of Metallurgy and Materials. 52(3), 467-474.

[5] Janerka, K., Jezierski, J. & Szajnar, J. (2011). The evaluation of effectiveness of liquid cast iron recarburization process by using different carburizers and methods of recarburization. Proceedings of 20th Anniversary International Conference on Metallurgy and Materials METAL 2011, Brno, Czech Republic.

[6] Janerka, K., Bartocha, D., Szajnar, J. & Jezierski, J. (2010). The carburizer influence on the crystallization process and the microstructure of synthetic cast iron. Archives of Metallurgy and Materials. 55(3), 851-859.

[7] Janerka, K., Pawlyta, M., Jezierski, J., Szajnar, J. & Bartocha, D. (2014). Carburizers properties transfer into a structure of melted cast iron. Journal of Materials Processing Technology. 214, 794-801.

[8] Janerka, K., Jezierski, J., Bartocha, D. & Szajnar, J. (2013). Heredity of the Structure and Properties of Grey Cast Iron Melted on a Basis of Steel Scrap. Advanced Materials Research. 622-623, 685-689.

[9] Edalati, K., Akhlaghi, F. & Nili-Ahmadabadi, M. (2005). Influence of SiC and FeSi addition on the characteristics of gray cast iron melts poured at different temperatures. Journal of Materials Processing Technology. 160, 183-187.

[10] Onsoien, M.I., Skaland, T. (2001). Preconditioning of Gray Iron Melts using Ferrosilicon or Silicon Carbide. American Foundry Society.

[11] Schmidt-Szalowski, K., Szafran, M., Sentek J., Bobryk E. (2013). Chemical Technology. Warsaw: PWN. (in Polish).

[12] Bielanski, A. (2010). Inorganic chemistry basics, v.2. Warsaw: PWN. (in Polish).

[13] Kielski, A. (1969). Ceramics technology basics. Ed. no. 152. Kraków: AGH. (in Polish).

Archives of Foundry Engineering

The Journal of Polish Academy of Sciences

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CiteScore 2016: 0.42

SCImago Journal Rank (SJR) 2016: 0.192
Source Normalized Impact per Paper (SNIP) 2016: 0.316

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