关键词: RH炉, 浸渍管, 炉外精炼, 热维护

Abstract: In order to improve the service life of the immersion tubes used in the RH furnace,the existing problems of the immersion tubes during operation such as the falling off of casting material,the burning damage of steel lining,the explosion of welds and brick body,and the low efficiency of thermal maintenance,etc.) were analyzed.Through the implementation of comprehensive measures such as the optimization of process parameters,the improvement of the structure of immersion tubes,and the adjustment of thermal maintenance,the average service life of impregnated tubes has been significantly increased from 105 to 118 furnace times,and the failure rate has been reduced by 15%.The consumption of refractory spraying materials per ton of steel has been reduced by 0.05 kg,and the problems of casting falling off and weld cracking have been effectively solved.The cost of smelting production and consume of refractory material have been significantly reduced ,and reliable technical support have been provided for stable production of high-value-added silicon steel and electrical steel by the implementation of comprehensive measures in the workshop.

Key words: RH furnace, immersion tube, ladle refining, hot maintenance