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Experimental study of pack carburizing of low carbon steels grade St.37, using high-carbon materials as mangrove charcoal for surface hardening. Mangrove charcoal provides benefit in local available and natural resources utility for substituting coke. The catalysts are calcium carbonate (CaCO3), sodium carbonate (Na2CO3) and barium carbonate (BaCO3). The ratio of mangrove charcoal to catalysts was 91:9. The pack carburizing process was applied by means of packing the samples in the heat-resistant containers and filled up with each ratio of pack carburizing catalysts. All samples were heated at temperature 950C for four hours, followed by rapidly quenching in water. The hardness measurements were subsequently analyzed by the Micro Vickers Hardness Tester for total case depth measurement. The results showed that the mangrove charcoal mixed with barium carbonate gave the highest hardness with an average value of 837 HV. The chemical compositions of low carbon steel rods were done by an optical emission spectroscopy (OES). The carbon content at carburizing surface was 1%. The total case depth exhibited the lowering due to the mechanism of carbon transfer.
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