中间包等离子加热工业试验

Industrial practice of tundish plasma heating

控制中间包内钢水温度变化是提高生产率和产品质量的有效方法之一。中间包等离子加热能够弥补浇注过程中钢水温降,稳定钢水温度,提高铸坯质量。对某厂中间包等离子加热进行工业试验研究。采用三中空石墨电极等离子加热装置对中间包内钢水进行加热。通过两组中间包等离子加热试验,探究等离子加热对中间包内钢液温度变化和钢液成分及夹杂物特征的影响。结果表明,等离子加热中间包内钢水升温效果明显,升温速率可实现0.8℃/min,同时也能够使钢水温度保持稳定;等离子加热后中间包内钢水全氧含量下降,氮含量基本不变,碳含量略有升高;加热后钢液中夹杂物的数密度明显降低,分别下降了7.43%和19.68%。中间包等离子加热可稳定中间包内钢液过热度,促进了氧化物夹杂的上浮去除,提高了铸坯质量。

Controlling the temperature variation of molten steel in tundish is one of the effective methods to improve productivity and product quality. The tundish plasma heating can compensate for the temperature drop of molten steel during pouring, stabilize the temperature of molten steel and improve the quality of slab. The industrial practice of tundish plasma heating were studied. The molten steel in tundish was heated by a plasma heating device with three hollow graphite electrodes. Through two groups of tundish plasma heating practice, the effects of plasma heating in tundish on the temperature change, composition change and inclusion characteristics of molten steel were studied. The results showed that the heating effect of molten steel in tundish heated by plasma was obvious, the heating rate can reach 0.8 ℃/min and the temperature can be maintained in a stable range. After plasma heating, the total oxygen content of molten steel in tundish decreased, the nitrogen content basically remained unchanged, and the carbon content slightly increased. At the same time, the number density of inclusions in molten steel obviously decreased by 7.43% and 19.68%, respectively. The tundish plasma heating could stabilize the superheat of molten steel in tundish, promote the floating and removal of oxide inclusions and enhance the quality of slab.