Interactions between CO_2 from limestone containing refractories and manganese steel and its influence on Mn, C and total oxygen content of steel

摘要

Reactions between Mn of manganese steel and CO_2, which derives from limestone containing refractories under high temperature, were studied via vacuum induction furnace. Refractory crucibles manufactured with limestone contents of 0, 10 and 20 wt-% were filled with manganese steel, which was melted in an Ar atmosphere. Samples were taken from the steel liquid at regular intervals by quartz tube during the experiment; the molten steel was poured out from crucible when the experiment was finished. Mn, C and total oxygen content of steel samples taken from the molten steel were tested, and also, the refractory crucible was investigated after the experiments. The results show that CO_2, which comes from limestone containing refractories, can react with the Mn in the steel, the result being an increase in C content and total oxygen content of steel.