首钢板坯连铸机改造工程设计及投产

介绍了首钢第二炼钢厂双流大板坯连铸机高效化改造工程项目的设计及投产情况。重点介绍了连铸机改造机型的确定、为提高生产能力和产品质量而采取的主要技术措施、工艺设备改造主要内容、改造前后铸机主要技术参数对比以及工程项目施工投产情况等。     

薄板坯连铸连轧技术在我国的确大有可为

对我国薄板坯连铸连轧技术2002年以后的发展进行了分析，认为今后将有更大的发展前景，并提出开发新一代薄板坯连铸连轧生产线的设想。     

连铸坯表面裂纹的控制

生产无缺陷的连铸坯是连铸坯热送、热装的前提条件.铸坯表面裂纹可能导致最终轧制产品出现缺陷.简要评述了影响连铸坯表面纵裂纹、横裂纹和星形裂纹形成的原因,及防止表面裂纹产生的技术措施.     

非圆齿轮在板坯连铸机结晶器振动装置中的应用

通过对板坯连铸机结晶器振动装置的改进,获得了较为理想的振动参数,使结晶器得到良好润滑,铸坯振痕轻微,拉坯阻力最小,从而得到良好的铸坯表面质量.     

中薄板坯高速连铸保护渣的研制开发

详述了中薄板坯连铸机的特征,以及保护渣设计过程中,为适应这些特征所必须遵守的原则.对开发出的保护渣试验结果进行了介绍,并对此作了比较详尽的分析和总结.     

减少厚板坯表面横裂纹的研究

铸坯表面横向裂纹是连铸坯较严重的缺陷,其对铸坯的生产和质量危害很大.主要分析了鞍钢集团新轧钢公司第一炼钢厂厚板坯表面横裂纹产生的原因,同时针对各种原因,制定相应的预防措施,以减少表面横裂纹的发生.     

板坯连铸结晶器电磁制动技术及其应用

叙述了板坯连铸结晶器中应用电磁制动技术的发展、研究状况。电磁制动技术可以控制结晶器内钢液的流动，减少结晶器保护渣的卷渣，有利于结晶器内夹杂物的去除，从而提高铸坯质量，并有利于提高铸坯拉速。研究结果表明电磁制动特性取决于板坯宽度、浇铸速度、氩气流速和浸入式水口(SEN)形状等浇铸参数，介绍了各种浇铸参数对电磁制动效果的影响。     

某高层住宅楼转换层施工案例分析

讨论了厚板迭合层的几种施工方法，并对其中二次迭合成型施工法进行了详细的论述，通过具体案例分析，进行了技术经济比较，为类似工程的应用提供了参考。     

比利时UGINE ＆ ALZ新建不锈钢厂投产一年的运行情况

2000年11月奥钢联从比利时ALZ获得将其不锈钢产能提高1倍、达到120万t／a的合同。介绍了相关设备及投产一年以来的运行结果。     

Flow,Thermal and Microstructural Analysis during Cast Rolling of Steel in In‐line Strip Production Process

A mathematical model was developed to describe the in‐line hot rolling deformation and recrystallization behaviour of austenite after the solidification on a thin slab casting plant. The most significant features of the cast rolling process were taken into consideration: through‐thickness thermal gradients, inhomogeneous stress and strain, temperature discontinuity between the strip and the rolls. A HSLA (High Strength Low Alloy) steel has been chosen to perform the experiments of cast rolling. The characteristic constants ruling the microstructural evolution of that steel were computed and integrated into the computational module which manages the structural stress‐strain and strain rate computation. The developed approach is based on the Navier‐Stokes’ equations which were used to compute the speed field in the strip during the deformation. Then a model providing a proper constitutive equation was structured on the basis of the Yada's model based on evolution of the dislocation populations. The use of the Navier‐Stokes’ formalism allows to reach the resolution of the structural problem from the data measured easily during the industrial practice (i.e. speed of the rolled product at the entry and at the exit of a stand, the temperature of the rolled material). The validation of this computational approach was obtained by a comparison between the prior austenite grain size of the strip in different positions of the hot rolling process, as well as by a comparison between the computed deformation power and the measured one provided by the engines moving the rolls.