Journal of Iranian Ceramic Society
Journal of Iranian Ceramic Society
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Department of Materials Science and Engineering, Ahvaz Branch, Islamic Azad University , zbalak1983@gmail.com
Abstract: (56 Views)
Reducing downtime in the production process of steel products is considered one of the effective factors in lowering their total cost and increasing productivity. The electric arc furnace is the heart of production in steelmaking plants; therefore, reducing downtime of this equipment in any way increases production efficiency and leads to greater profitability for this industry. Since this furnace is of the batch type, after each preparation of the molten metal, the discharge operation occurs through an outlet in the bottom of the furnace known as Eccentric Bottom Tapping (EBT). The diameter of this discharge outlet increases with each discharge, raising the risk of damage to the furnace equipment and the entry of slag into the molten metal. Replacing this outlet is time-consuming and leads to long downtimes; hence, magnesium masses are currently used to repair the EBT discharge outlet. Therefore, in the present study, to increase the efficiency and improve the quality of the consumed magnesium mass, the effect of adding micronized chromia as an additive (0 to 3 weight percent) on the physical, mechanical, and thermochemical properties of this repair mass has been investigated. Additionally, to examine the results more precisely, X-ray diffraction (XRD) was used for phase analysis, and scanning electron microscopy (SEM) was used for examining the microstructure of the samples. It was found that the lowest apparent porosity, approximately 12 percent, is in the sample containing 1.5 percent chromia. According to the results obtained, it was determined that the sample containing 1.5 percent chromia has the highest cold compressive strength (500 kg/mm²) and cold bending strength (155 kg/mm²). Furthermore, the best resistance to slag corrosion is found in the sample containing 1.5 percent chromia.
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