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首页> 外文会议>Ninth international conferece on molten slags, fluxes and salts >Active Tundish Slag
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Active Tundish Slag

机译：活性中间包渣

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The role of tundish was originally to function as a steel reservoir after the ladle and a distributor into continuous casting moulds. It was designed to obtain proper steel flow pattern through the tundish and to keep thermal losses inside certain limits. When production of "clean" steels with high requirements for oxide inclusions was developed by applying sophisticated secondary steelmaking treatments in the ladle the role of tundish became more critical. It became essential to maintain or even to improve the level of the steel cleanliness by minimizing contamination of steel with air, slag or refractory materials between ladle and the casting moulds. According to a novel principle of clean steel production the main function of tundish is to maintain the level of cleanliness attained in the ladle by minimizing harmful contamination of steel with air, slag or refractory materials from ladle to moulds. This could be called a "protective or inert tundish practice". As a consequence, the function of tundish slag is a barrier against reoxidation and thermal losses. By reconstructing tundish to a closed chamber with lid, argon gas shrouding and eventual heating system, tundish slag might be even ignored. The concept of "active tundish slag" aims definitely at improving of steel cleanliness by "tailoring" a proper tundish slag. In this project active tundish metallurgy was investigated and assessed. Computation of phase diagrams was used as an approach to understand properties and behaviour of tundish slags in casting conditions. Eventual reactions between steel and slag in the tundish were examined by equilibrium calculations. Interfacial phenomena controlling inclusion removal and dissolution into tundish slag were investigated by applying several experimental techniques. Dissolution of alumina and MgO·Al2O3 inclusions into slag were studied by model experiments applying CLSM and DHTT methods. Viscosity of slags was measured by rotating cylinder method at different temperatures. Interfacial tension between steel and slag were measured by drop weight method for several slag/steel systems. The study showed the complexity and multi-disciplinarity in designing slags which can efficiently absorb macro- and micro-inclusions from different steels and at the same time act as protective cover against reoxidation and thermal losses. The final conclusion was that slag optimization is a challenging issue on which favourable metallurgical and thermal properties should be combined with long-lasting effect during sequential casting operation.
机译：中间包的作用最初是在钢水包起钢水库的作用，并在连续铸模中分配器。它的设计目的是通过中间包获得合适的钢流模式，并将热损失保持在一定范围内。当通过在钢水包中应用先进的二次炼钢工艺开发出对氧化物夹杂物要求高的“清洁”钢时，中间包的作用变得更加关键。通过最小化钢包和铸模之间的空气，炉渣或耐火材料对钢的污染，保持甚至提高钢的清洁度变得至关重要。根据清洁钢生产的新原理，中间包的主要功能是通过将钢从钢包到铸模的空气，炉渣或耐火材料的有害污染减至最小，来保持钢包中所达到的清洁度。这可以称为“保护性或惰性中间包实践”。结果，中间包渣的功能是防止再氧化和热损失的屏障。通过将中间包重建到带盖的密闭室，氩气罩和最终的加热系统，甚至可以忽略中间包渣。 “活性中间包渣”的概念肯定旨在通过“定制”适当的中间包渣来提高钢的清洁度。在该项目中，对中间包冶金进行了调查和评估。相图的计算被用作了解中间包渣在铸造条件下的性能和行为的一种方法。通过平衡计算检查了中间包中钢与炉渣之间的最终反应。通过应用几种实验技术研究了控制夹杂物去除和溶解到中间包渣中的界面现象。采用CLSM和DHTT方法通过模型试验研究了氧化铝和MgO·Al2O3夹杂物在炉渣中的溶解。通过旋转圆筒法在不同温度下测量炉渣的粘度。通过滴重法测量了几种钢渣/钢系统的钢与渣之间的界面张力。研究表明，设计渣的复杂性和多学科性可以有效吸收不同钢中的宏观和微观夹杂物，同时还可以防止再氧化和热损失。最终结论是，炉渣优化是一个具有挑战性的问题，在后续的铸造操作中，应将良好的冶金和热性能与长效结合起来。

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