Abstract
The present work evaluates the possibility of using local minerals to create foundry alloys used in conditions of low temperature. The feasibility of using iron ores from the Kentik ore occurrence in the Verkhnevilyuysky district of the Republic of Sakha (Yakutia) for the manufacture of new cold-resistant and high-strength steels was analyzed. The ore contains oxides of alkaline earth metals: MgO, CaO, Sr0 and BaO, the total content of that is 1.6%, that contributes to the process of deoxygenation of the melt during its cooling, and the deoxygenation product in the form of oxides and other chemical compounds based on Ca, Sr and Ba floats into slag. The content of rare earth yttrium oxide is 0.0058%. Alloy is smelted from Kentik enriched ore, samples for static tensile and impact toughness tests were machined in order to study the mechanical properties. The results of chemical analysis showed that the total content of rare earth oxides Eu2O3, Tb4O7, Dy2O3 and Er2O3 was 0.062%. Such concentration of rare-earth metals promotes the increase of strength properties, as well as the operational characteristics of the material. The fracture surface of impact toughness sample is investigated. Analogues for comparing the strength and plastic properties were given. Technical instructions for obtaining an experimental samples of a cold-resistant medium-carbon alloy with increased strength for castings using a charge of naturally alloyed ferroalloy have been formulated.
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