脱磷转炉内成渣路线的理论研究

以CaO-SiO2-FeO三元渣系为基，利用正规溶液模型计算了不同碱度、炉渣组分对于脱磷转炉内磷分配比和终点磷含量的影响规律；同时，采用Factsage软件计算了不同脱磷渣系的液相线温度，考察了添加不同炉渣组元对于渣系液相线温度的影响规律。综合理论计算结果，得到脱磷转炉适宜的成渣路线为铁质成渣路线，脱磷初渣成分为15%CaO-44%SiO2-41%FeO，中期渣成分为53%CaO-25.5%SiO2-21.5%FeO,后期固磷渣成分为63.6%CaO-30.3%SiO2-6.1%FeO。可为脱磷转炉的生产操作提供参考。     

High Nitrogen Austenitic Stainless Steels Manufactured by Nitrogen Gas Alloying and Adding Nitrided Ferroalloys

 A simple and feasible method for the production of high nitrogen austenitic stainless steels involves nitrogen gas alloying and adding nitrided ferroalloys under normal atmospheric conditions. Alloying by nitrogen gas bubbling in Fe Cr Mn Mo series alloys was carried out in MoSi2 resistance furnace and air induction furnace under normal atmospheric conditions. The results showed that nitrogen alloying could be accelerated by increasing nitrogen gas flow rate, prolonging residence time of bubbles, increasing gas/molten steel interfaces, and decreasing the sulphur and oxygen contents in molten steel. Nitrogen content of 069% in 18Cr18Mn was obtained using air induction furnace by bubbling of nitrogen gas from porous plug. In addition, the nickel free, high nitrogen austenitic stainless steels with sound and compact macrostructure had been produced in the laboratory using vacuum induction furnace and electroslag remelting furnace under nitrogen atmosphere by the addition of nitrided alloy with the maximum nitrogen content of 081%. Pores were observed in the ingots obtained by melting and casting in vacuum induction furnace with the addition of nitrided ferroalloys and under nitrogen atmosphere. After electroslag remelting of the cast ingots, they were all sound and were free of pores. The yield of nitrogen increased with the decrease of melting rate in the ESR process. Due to electroslag remelting under nitrogen atmosphere and the consequential addition of aluminum as deoxidizer to the slag, the loss of manganese decreased obviously. There existed mainly irregular Al2O3 inclusions and MnS inclusions in ESR ingots, and the size of most of the inclusions was less than 5 μm. After homogenization of the hot rolled plate at 1 150 ℃×1 h followed by water quenching, the microstructure consisted of homogeneous austenite.     

超纯铁素体不锈钢的开发与应用现状

介绍了合金元素对超纯铁素体不锈钢性能的影响,阐明了超纯铁素体不锈钢的冶炼工艺、应用范围及其研究开发现状。     

焦炉热态修补技术的改进

介绍了HB高温耐火粘结剂在焦炉热态修补技术中应用的机理、试验情况及效果。     

钛渣炉在钒钛磁铁矿冶炼新工艺流程中的应用

通过对钒钛磁铁矿在常规冶炼工艺流程和新工艺流程的生产实践的研究,分析了钛渣炉在常规工艺流程与新工艺流程中的不同应用功能,并对比了相关工艺参数,提出了钛渣炉在新的工艺流程中主要担当了熔分深还原的作用,最终达到铁、钒、钛分离及回收的目的。     

低镍铁水冶炼1Cr14Mn10NiCuN不锈钢生产工艺优化

通过对1Cr14Mn10NiCuN不锈钢冶炼的几种原料条件和工艺路径对比分析,发现采用低镍高炉铁水为主要原料的工艺流程因铁水成分、温度和洁净度更优而更具竞争力。某厂采用高硅含铬低镍铁水冶炼1Cr14Mn10NiCuN不锈钢,铁水带入铬可节约50铬铁用量约66.7 kg/t(钢),降低成本约400.5元/t(钢),但预处理环节铬的收得率仅为88%,铬损失量折算成50铬铁达到9.1 kg/t(钢),折合人民币约54.6元/t(钢)。工艺优化方案考虑在铁水预处理炉吹氧结束时加入合金熔化炉熔化的铬铁水,利用铬铁水中的硅还原渣中的铬。工艺方案优化后在预处理炉环节将低镍铁水中的铬收得率提高至95%,使生产全流程50铬铁加入量减少约5.3 kg/t(钢),降低成本约31.9元/t(钢)。     

炼钢短流程工艺国内外现状及发展趋势

概述了电弧炉炼钢短流程的发展和特点,介绍了一些应用得比较成熟的技术如:DRI、热装铁水、废钢预热等在电弧炉短流程炼钢上的应用和新短流程工艺技术研究,并简要分析了中国短流程炼钢的现状,对短流程的发展趋势提出了一些看法。     

Ultra-Pure Ferritic Stainless Steels-Grade,Refining Operation,and Application

The grades of ultra-pure ferritic stainless steels,especially the grades used in automobile exhaust system,were reviewed.The dependence of properties on alloying elements,the refining facilities,and the mechanism of the reactions in steel melts were described in detail.Vacuum,strong stirring,and powder injection proved to be effective technologies in the melting of ultra-pure ferritic stainless steels.The application of the ferritic grades was also briefly introduced.     

基于反应平衡热力学的转炉炉气分析温度预报模型

炉气分析技术不但可以实现转炉温度连续预测,而且使用年限长.由于不受转炉炉口限制,该技术在不同吨位的转炉上均可应用.本研究根据炉气分析仪实时检测转炉烟气成分,基于反应平衡热力学和对万雪峰模型的修正,建立了转炉实时温度预报模型.修正后的炉气分析模型计算曲线走向稳定,计算值与实测值的误差较小,能真实反映转炉炉内状况.     

铁水脱磷工艺分析研究

从铁水脱磷工艺、设备、应用实绩等角度,对铁水炉外脱磷和炉内脱磷工艺进行了分析研究,并给出了铁水脱磷各个工艺方案的优点及不足,为钢铁厂铁水脱磷工艺方案的选择提供参考意见。