The process model for BOF process can be applied to predict the liquid steel composition and bath temperature during the whole steelmaking process. On the basis of the traditional three-stage decarburization theory, the concept of mixing degree was put forward, which was used to indicate the effect of oxygen jet on decarburization. Furthermore, a more practical process model for BOF steelmaking was developed by analyzing the effect of silicon, manganese, oxygen injection rate, oxygen lance height, and bath temperature on decarburization.Process verification and end-point verification for the process model have been carried out, and the verification results show that the prediction accuracy of carbon content reaches 82.6% (the range of carbon content at the end-point is less than 0.1wt%) and 85.7% (the range of carbon content at end-point is 0.1wt%-0.7wt%) when the absolute error is less than 0.02wt% and 0.05wt%, respectively.

By analysing the factors that affect oxygen consumption during the basic oxygen furnace steelmaking process, a multiple linear regression model for predicting the oxygen blowing quantity was obtained on the basis of actual production data. Additionally, an oxygen balance model for prediction of the oxygen blowing quantity was established on the basis of oxygen balance. These two models were amalgamated to establish an integrated model for prediction of the oxygen blowing quantity. The average relative error of the integrated model is ,1%, and the hit rate of the integrated model is 97?14% when the relative errors of the model are within 5%.Relative to the multiple linear regression and the oxygen balance models, the integrated model may provide a more accurate prediction of the oxygen blowing quantity, and thus represents a good reference point for actual production.

在功能可靠度和时产率可靠性评价指标的基础上，结合钢铁生产过程系统能源消耗状况的分析，建立了能耗可靠性评价方法，提出了能耗可靠度、工序能效比及相近度等评价指标体系来描述钢铁生产过程系统的能耗可靠性．运用贡献指数的概念定量分析了后两者对能耗可靠度的影响，并应用于国内某特殊钢厂电弧炉生产过程单元． 结果表明: 该电弧炉工序的能耗可靠度由2008 年的0. 64 提高到2009 年的0.72．另外，还分析了该厂2006—2009 年电炉工序能耗可靠度变化的主要原因．

A software to simulate the solidification, heat transfer and water flowrate distribution in slab continuous casting was developed by establishing a mathematical model for the heat transfer and solidification in medium thickness slab casting. This model was validated by pin shooting and surface temperature measurement experiments. A reasonable target surface control temperature was found by testing the high temperature mechanical properties of Nb bearing ship plate steel,and then the water flowrate of each loop of the secondary cooling zone was determined by the software. The influence of uneven secondary cooling in the slab width direction on the quality of the slab was also investigated, which provided data for the optimisation of the secondary cooling of the slab caster. On the basis of the above research, an optimisation scheme for a secondary cooling system was proposed. Experimental results showed that the quality of the slab was significantly improved after optimisation. The centreline macrosegregation was reduced, and the ratio of equiaxed grains was increased by 3?18%. In addition, the transverse cracking of the slab was almost eliminated.

含铌钢铸坯出现角部横裂一直是困扰邯钢第三炼钢厂二号板坯连铸机生产的质量问题，本文重点研究了铸机矫直区现行喷嘴布置对板坯冷却效果的影响，并在喷嘴自动化测试平台上进行一系列喷嘴的组合实验，从喷嘴流量、喷射高度、水压三个方面探讨了相邻喷嘴喷淋水重叠度与水量在板坯宽度方向分布均匀性的关系。在此基础上，对现行的二冷喷淋系统提出了优化方案。实验结果表明，优化后铸坯角部横裂基本消除，铸坯中心偏析减轻至C类1.5，其等轴晶比率提高了4.1%，明显地改善了铸坯的内部质量。