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The Melting Process and its Impact on the Properties of High-Chromium Cast Iron and the Economic Calculation

Mędoń Jan, Szczęsny Andrzej, Ziółkowski Eugeniusz, Guzik Edward, Czarny M., Kopyciński Dariusz

Archives of Foundry Engineering

2023

Vol. 23, iss. 4

54--64

The subject of this study is to show that the parameters of the melting process of high chromium cast iron affect the cost of casting and the properties of the cast iron. The analysis of the quality of the casting and its price was conducted in terms of the metal charge of high chromium cast iron. As is well known, in order to obtain the correct structure of the casting, and thus good strength properties, it is necessary to use clean batch components free of undesirable impurities. Unfortunately, the quality of the metal charge is proportional to its price. Thus, the use of expensive batch components offers the possibility of obtaining healthy and meeting the strength properties of castings. However, there is a flaw in this approach. And it is from the point of view of economics that production plants are forced to look for savings. Expensive feedstock materials are replaced by cheaper counterparts giving the possibility of obtaining castings with similar properties often, however, at the cost of increased inferior quality. It seems that a way out of this situation is to introduce a modification procedure into the alloyed iron manufacturing technology. The selected modifiers should affect the fragmentation of the structure of the primary austenite. At this point, it can be hypothesized that this will result in the elimination of hot cracking in high chromium cast iron. The industrial research carried out at the "Swidnica" Foundry Ltd. made it possible to show by means of the Althoff-Radtke method that by using the modification of the liquid metal of the so-called "inferior and cheaper" composition of the metal charge, a reduction in the occurrence of hot cracks and shrinkage cavities can be achieved. In addition, iron-niobium modification not only reduced the formation of casting defects in castings, but also slightly improved the impact strength of high-chromium cast iron. The work was written as part of an implementation PhD.

Modernizacja technologii procesu wytwarzania stali w Hucie Stali Częstochowa Sp. z o.o. z zastosowaniem alternatywnych materiałów wsadowych

Galisz U., Zdonek B., Bulkowski L., Pogorzałek J., Kuźnik T., Żak A., Szota L., Ujma J., Orman L., Gdula W., Czarny M., Sobecki M., Cierniak H.

Prace Instytutu Metalurgii Żelaza

2006

T. 58, nr 1

15--23

Omówiono zakres i wyniki badań realizowanych w ramach projektu celowego dofinansowanego przez KBN, którego głównym celem było podjęcie w Hucie Stali Częstochowa Sp. z o. o. przedsięwzięć, zmierzających do poprawy efektywności ekonomicznej stalowni poprzez zmniejszenie zużycia energii elektrycznej, skrócenie czasu wytopu, a tym samym zwiększenie wydajności pieca KONEL, jak również przez zwiększenie sekwencyjności ciągłego odlewania i wielkości produkcji wlewków ciągłych oraz osiąganie wymaganej jakości wyrobów z równoczesną minimalizacją kosztów.

The scope and results of the tests carried out under the specific targeted project funded partially by the State Committee for Scientific Research were discussed and the main purpose of the project was to take up undertakings at Huta Stali Częstochowa Sp. z o. o. aiming at improvement in economic effectiveness of the steel plant by means of reduction in electric energy consumption, reduction in melting time, and thus the increase in efficiency of KONEL furnace, as well as through increasing the sequencing and volume of continuous casting and achievement of the reguired product quality with simultaneous cost minimisation.