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Malleable cast iron is an variant of cast iron which has roseshaped graphite, the appearance of graphite due to the process of heat treatment. In general, a Boron element is needed in making the material. In this study, Tellurium was used as a substitute for boron. The main objective of the investigation was to determine the effect of tellurium composition on graphite microstructure and the mechanical properties of malleable cast iron. Variations in tellurium are added to the ladel, cast into specimen molds. Each specimen was subjected to annealing heat treatment at 9000C and held for 10 hours. Then each specimen was tested in composition, microstructure, and hardness test. The test results showed that there was an effect obtained from the addition of tellurium to microstructure and hardness. Graphite structure increases from 2% to 6.5% and hardness increases from 38 HRc to 43 HRc.

Tellurium Effect on ASTM A 220 Graphite Malleable Cast Iron