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电炉白渣法冶炼的轴承钢中的点状夹杂主要是Al和Ca的氧化物,此外还有少量Mg的氧化物。本文以放射性同位素Ca~(45)作为示踪元素研究了大颗粒点状夹杂的形成机构。结果表明,这些夹杂是由出钢过程未被排除的浮化渣滴生成的。本文指出了成品材的大粒点状夹杂和出钢时炉渣之间成分差别的原因,来自混渣造成的夹杂物的量(Y)和时间(X)之间的关系遵循下式:Y=de~(c/x)。一些工艺因素,诸如脱氧、钢的沸腾、还原渣成分、脱硫效率和镇静时间等必须很好控制,以改善和稳定轴承钢的质量。使用绝热帽有利于减少钢锭头部的夹杂。
The point inclusions in the bearing steels of the EAF smelting are mainly the oxides of Al and Ca, in addition to a small amount of oxides of Mg. In this paper, the radioactive isotope Ca ~ (45) as a trace element to study the formation of large particles dot inclusions. The results show that these inclusions are formed by the floating slag droplets that are not excluded in the tapping process. This paper points out the reason for the difference in the composition of large grains between the finished product and the slag during tapping. The relationship between the amount of inclusions (Y) and the time (X) due to slag mixing follows the equation: Y = de ~ (c / x). Some process factors, such as deoxidation, steel boiling, reducing slag composition, desulfurization efficiency and settling time, must be well controlled to improve and stabilize the quality of the bearing steel. The use of heat-insulated caps helps to reduce inclusions in the ingot head.