engleski

The use of metallurgical coke as carburizing material in the foundry

The properties of metallurgical cokes obtained in a laboratory from pure coal and with additives (light atmospheric residue of oil distillation and coal tar pitch) after heat treatment to 1600 °C were investigated. Changes in the basic characteristics (density, moisture, ash, metal and sulphur contents) were examined. Crystallographic parameters (crystallite size, Lc and interlayer spacing, d002) and surface morphology were also determined. The results were compared to data on a commercial carburizing material used in foundries, known as “ Karbina” . The metallurgical coke produced by mixing coal and coal tar pitch is good for thermal conversion to a semigraphitic structure at higher temperatures (1600 °C). Because of this and its physical-chemical characterisics the material is recommended as a suitable carburizing material.

additives; carburizing material; coke; heat treatment; microstructure; properties

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