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• Time of issue:2017-05-05 16:38
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(Summary description)How to extend the life span, achieve true success, continuity of the steel production process, and the development of a compact process, is also an important manifestation of speeding up efficiency. At present, the life span of the tundish of many European steel mills has reached 30-50h, and the American steel mills have increased their predecessors by nearly 100h. The life of the tundish is based on the improvement of the work rate and the process and quality requirements of the entire continuous casting process. I hope that the life of a single tundish in continuous use is no longer calculated in terms of heat, but in hours. It is a well-known fact that continuous casting greatly saves energy consumption and the consumption of various raw materials than die casting, and greatly improves the quality of steel products. Under the premise of slag splashing protection, the lining life of the converter has advanced to a new level, reaching the level of more than 10,000 furnaces or even 30,000 furnaces. Mainly around the requirements of the following aspects: ①The life of refractory materials that have been greatly improved requires that the life of supporting refractories should be kept in step with it; ②The structural design must adapt to the production requirements of continuous use; ③In ensuring the refractory of the parent body Under the premise of the basic life of the material, improve the high-temperature performance of the repair material and maintain the longer life of the parent refractory; ④The material design should be beneficial to the repair and regeneration of some high-end refractory materials to extend their service life. For example, the life of a ladle has evolved from being repeatedly used ten times to hundreds of times.

High-speed, continuous, and high-quality steelmaking production must be blamed for the production process to greatly improve the level of automatic control, and to develop in the direction of intelligence. The high-speed, continuous, and high-quality production characteristics confirm that the new steelmaking production must be smooth and smooth. , No chaos, and basically no accidents. It should also be pointed out that hot metal pretreatment and molten steel refining (up to tundish, mold metallurgy) have become an optimized combination of important components of the new process, which has promoted the development of compact and continuous processes. Continuous casting production optimization has also played a pivotal role, especially near-net-shape continuous casting technology (the highest level of high-quality, high-speed, high continuous casting rate, and high-performance continuous casting technology development) has laid the foundation for a compact process. The continuous casting production is not chaotic on the process, and the increasingly stringent requirements for quality optimization have promoted the rapid development of clean steel and pure steel production technology with molten iron pretreatment and molten steel refining as the core, and proposed non-polluting molten steel for various raw materials. , And even further purify the new requirements of steel.

　　Secondly, the requirement for longer life also has new connotations in content. At the same time, due to the popularization and development of continuous casting and refining, the holding time of molten steel in the ladle is generally prolonged every time it is used, and it has to adapt to various metallurgical processing functional requirements, and the actual life is longer.

　　 Fast, efficient, compact and continuous is itself an important factor in promoting high-quality steelmaking with low consumption. The lining life of the AOD refining furnace must exceed 100 furnaces and so on. First of all, the requirements for life indicators have undergone unimaginable changes in the past. The predecessor's index for improving the life of electric furnace lining and cover has reached more than 1,000 furnaces. These high-end production requirements not only need to improve the optimized new technology of the predecessors, but also need the support of complete detection and control equipment, modern information technology and the guarantee of various new refractory materials with optimized functions. For example: continuous casting tundish nozzle seat brick life should be synchronized with the lining life; while long nozzles and immersion nozzles need to improve the structure to achieve rapid replacement; for continuous casting steel with high silicon and aluminum content, in order to prevent Al2O3 from depositing and clogging For intermittent production, it is necessary to design an immersion nozzle with anti-clogging function from the material and structure; and the converter lining refractories only need to meet the most basic refractory performance and high temperature strength requirements. The longevity of refractories has been transformed into a good one. The adhesion of the slag splash layer (such as th