FeNb在钢液中的溶化行为及在钢包精炼过程中提高Nb收得率的最佳工艺

阐述了标准铌铁(FeNb)的微观组织特性及其溶入钢液中的研究结果。在实验室的感应炉中进行了不同温度下的非连续试验,分析了固相FeNb与钢液凝固层界面的微观组织,并与原始FeNb粒子的微观组织进行了对比。这些试验研究结果可以阐释FeNb的溶解机制和它在不同炼钢温度下的融入动力学条件。标准FeNb在钢水中溶解的试验结果证实FeNb颗粒的溶解速率高于有关文献中报告的结果,它们认为FeNb粒子的熔化温度高(1600℃),所以在其模型中假定FeNb的溶解仅是通过固相粒子的扩散实现。本项工作得到的试验证据为标准FeNb的溶解机理提供了一种新的说法:在1500～1510℃受其共晶区的熔化行为控制,在1530～1575℃温度范围内则由初始板条相的熔化行为所主导,也就是说,均低于1600℃左右的炼钢温度。根据这些研究结果和炼钢厂已有的生产经验,对于微合金化钢在二次精炼阶段加入FeNb推荐了最优的工艺。     

球团烧结配加钢渣的研究

研究了球团烧结工艺条件下，钢渣配比与钢沽粒度对烧结生产的影响，还分析了配加钢渣对生产成本的影响。     

武钢第二炼钢厂近几年钢水成分控制的进展

介绍了武钢第二炼钢厂近几年钢水中碳和酸溶铝的含量及盛钢桶至中间包增氮的变化，以及控制这些万分所采取的措施。     

在汽雾冷却下转炉炉壳的瞬态温度场和水流密度理论分析

以有限元为基础，模拟了转炉炉壳的瞬态温度场。对温度-时间历程进行热分析，得出了汽雾冷却的水流密度。     

直接还原的现状与发展

简述世界直接还原工艺的发展、现状及动向，并侧重介绍我国的有关情况。对近几年国内外直接还原铁（DRI）的生产和市场前景进行了分析。     

Dissolution Kinetics of Magnesitic-Dolomite and Magnesite-Chrome Refractories in Secondary Steelmaking Slags

Dissolution kinetics of magnesitic-dolomite and magnesite-chrome refractories in secondary steelmaking slags was studied by means of the rotating cylinder method under forced convection. Materials investigated include four magnesitic-dolomite samples(MgO content 40% to 93%)and two magnesite-chrome samples (co-clinkered and semi-rebonded).Synthetic slags simulative of VOD and AOD slags with varying basicity (0.6-2.68) are used.The experiments are carried out in Ar atmosphere at different temperatures (1 600 ℃-1 750 ℃) and revolution speeds (200 r·min-1to 500 r·min-1).The microstructure of specimens (before and after slag tests) are studied by optical microscopy, SEM and EPMA. Based on our experimental results the mechanism and kinetics of the dissolution process are discussed.     

综合利用转炉泥的研究及实践

通过试验研究了在烧结过程中加入转炉尘泥对生产的影响，在实践中摸索出了湿法和干法利用转炉尘泥的有效途径，为资源综合利用和环保开辟了一条可行之路。     

150t顶底复吹转炉底枪改造对其冶金特性的影响

本文采用现场生产数据统计和数值模拟计算相结合的方法对150 t顶底复合吹炼转炉底枪改造前后的冶金特性进行分析,结果表明,改造后的底枪对熔池内钢液的搅拌力增强,显著改善了炉内的冶金动力学条件,加快了熔池内传质及化学反应速率,冶炼过程更接近于平衡态,各项经济技术指标良好,冶金性能优越。     

Research Progress of Numerical Simulation in Steelmaking and Continuous Casting ProcessesEI北大核心CSCD

Because of the complexity of steelmaking and continuous casting processes and their limitation condition for direct measuring and testing, numerical simulation has become an indispensable means to analyze the phenomena and mechanisms occurring in the processes, and since the 1980s, it has made a rapid development. For the converter smelting, some new oxygen lances were designed by using the simulation study of the characteristics of the oxygen lance supersonic jet. Some mathematical models have been established to describe the slag-metal-gas multiphase flow behavior in steelmaking converter, and the flow field, mixing efficiency, metal droplet splashing, lining scouring and other physical phenomena. For the ladle refining, the Euler-Euler model gradually replaces the quasi-unidirectional and Euler-Lagrangian models, and successfully describes the phenomena of bubble turbulent dispersion caused by liquid turbulent fluctuation, and bubble-induced turbulence occurring during bubble floating process. So, some new and important inclusion transport mechanisms and phenomena have been presented. The CFD-PBM model was used to predict successfully the inclusion transport, collision growth and removal behavior in the molten steel, which enriches the inclusions removal theory of ladle refining. The CFD-SRM coupled model was used to accurately describe the slag-metal reaction and desulfurization behavior in a gas-stirred ladle, and the effect of the different content of compositions in synthetic slag and liquid steel, arrangement of bottom blowing tuyeres on the slag-metal reactions and desulfurization efficiency were discussed and clarified. For steel continuous casting, as the heat flow model from the solidified shell to the copper plate of mold was coupled with the thermo/mechanical model of the solidified shell, distributions of mold flux and air gap both along circumference and height directions of the mold were successfully predicted, while founded theoretical backgrounds for designing new mold with inner convex surface and controlling the surface corner crack of micro-alloyed steel. The coupled simulation between flow and electromagnetic fields in mold revealed the flow behavior of molten steel with electromagnetic stirring or braking, the fluctuation characteristic of the slag-steel interface and the distribution characteristic of inclusions in the strand. Based on the volume averaged method, multi-field and multi-phase solidification model successfully clarified the formation mechanism of macro-segregation in continuously cast strand and quantitatively predicted central/centerline segregation indexes in the strand under different casting conditions. In addition, the numerical simulation of the evolution of solidification structure of the continuously cast strand mainly focused on the as-cast grain, and its extension to the dendrite structure needed further more endeavors. Generally speaking, the numerical simulation in steelmaking-continuous casting process is moving towards coupling multi-physical/chemistry phenomena and multi-fields and gradually transits to the microscopic scale.     

炼钢过程喷吹CO_2的实验研究

通过在炼钢过程中混合喷吹CO2,发现废钢为原料时,粉尘主要是由高温蒸发作用产生的;生铁为原料时,粉尘是在高温蒸发作用和气泡携带的共同作用下产生的。CO2的通入一方面降低熔池的温度,减弱了元素的蒸发;另一方面使得熔池搅拌加强,由气泡带走的元素增加。因此,CO2的通入应有一个合理的比例。