Rosmaida Panjaitan


Carbon is the basic element that is main and most important on steel and high  influence on the formation of carbides Fe3C/cementite. If the carbon content is increased on steel, the strength will increase but the impact value will decrease. Carbon in the steel greatly affect the hardenability,  in the presence of carbon in the steel, the hardness and strength can be improved by heat treatment. To add to the carbon on molten steel by using the carburizer in the form of granules with a diameter of 3-6 mm. The carburizer charged at the bottom of furnace, while the other alloying elements are added after raw material melt. Carburizer containing carbon as much as 99.59%, imported as brand of sascrap in the form of granules are packed in paper sacks weighing 25 kg/sack. Charcoal of coconut shell that produced by craftsmen also contains the high enough of carbon, a new and old charcoal of coconut shell containing carbon as 65.6% and 61.1%. In this study, the carbon source used is charcoal of coconut shell that produced by craftsmen. The raw material used is steel scrap in the form  of plate with the thickness of 1.2 - 5 mm which is the residue from the manufacture of the car body of trucks and tank cars.


coconut shell charcoal; carbon steel; melting;

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