我国连铸技术的现状与展望

简介了国内铸机的数量、种类、装备水平、高效连铸的发展；评价了典型钢种连铸坯的质量水平；提出了改善铸坯质量的建议；展望了今后连铸生产。     

攀钢连铸坯质量改进回顾及进一步改进的设想

总结了攀钢连铸投产以来连铸坯存在的主要质量问题和采取的改进措施。同时指出了近期连铸坯存在的主要质量问题，并提出了相应的改进意见。     

一炼钢厂连铸坯质量现状分析

1前言 一炼钢厂电改转生产已经四年,一些连铸设备和备品备件已不能满足产品质量要求,对连铸坯质量产生一定的影响。连铸坯质量主要存在三方面的问题：一是连铸坯表面冷却不均匀造成脱方;二是铸坯表面质量问题造成退废;三是铸坯中心裂纹。针对这三方面的问题,各部门进行技术攻关,连铸坯脱方和连铸坯退废得到有效控制,连铸坯质量合格率保持较好水平。     

连铸中间包等离子加热技术国内外应用及发展

本文综述连铸中间包等离子加热技术在国内外的应用及发展，对提高连铸坯质量，提高连铸坯生产和提高连铸技术水平有现实意义。     

连铸技术发展

简要评述了我国连铸技术的发展概况，传统连铸技术的发展，薄板坯连铸技术发展以及薄带坯连铸技术发展。对提高连铸机生产率和连铸坯质量的技术措施进行了讨论。     

120×120mm连铸坯产品质量稳定及提升实践

为稳定瑞钢公司120×120mm连铸坯的质量,针对产品存在的中心缩孔、皮下气孔、脱方、弯曲等质量缺陷问题,通过降低二次冷却强度,严格入炉辅料质量,改进二冷段喷淋段喷嘴,制作专用工具等措施,使连铸坯质量问题得到有效控制,提高了连铸坯的质量。     

连铸工艺对板坯裂纹的影响及防止措施

连铸坯的裂纹是造成连铸坯报废的主要原因，针对连铸板坯的宽面纵裂和角部横裂问题进行了金相组织检验和热模拟试验，对铸坯裂纹产生的原因和机理进行分析，提出了防止铸坯产生裂纹的具体措施。     

电炉连铸坯角部纵裂纹控制与探讨

从连铸坯角部纵裂纹产生原因分析入手,找出其控制措施,通过实践,有效地减少连铸坯角部纵裂的产生,为提高连铸坯表面质量进行了更深层次的探索,同时为解决连铸坯其它质量问题提供了参考模式。     

改变鞍钢管坯生产方式势在必行

介绍了管坯生产及其质量。对生产方式进行了比较，认为采用连铸坯生产无缝钢管是最经济合理的，工序简化，消耗降低，连铸坯比轧坯便宜１０－１５％，并且质量好。用连铸坯生产无缝钢管势在必行。     

连铸

攀钢方坯连铸高碳钢钢水温度控制现状；关于方坯连铸的LF炉控制系统；攀钢全连铸工艺技术；连铸圆坯内部裂纹的控制     

A mold simulator for the continuous casting of steel: Part I. The development of a simulator

Surface defects, such as oscillation marks, ripples, and cracks that can be found on the surface of continuously cast steel, originate in the continuous casting mold. Therefore, a detailed knowledge of initial solidification behavior of steel in a continuous casting mold is necessary because it determines the surface quality of continuously cast slabs. In order to develop an understanding of the initial solidification of continuous cast steels, a “mold simulator” was designed and constructed to investigate heat-transfer phenomena during the initial phase of strand solidification. The mold simulator was used to obtain solidified steel shells of different grades of steel under conditions similar to those found in industrial casting operations. The resulting cast surface morphologies were compared with industrial slabs and were found to be in good agreement, indicating that it is possible to simulate the continuous casting process by a laboratory scale simulator.     

Effect of melting and casting parameters on the hot ductility behavior of Nb-bearing beams,billets and slabs

The production of defect free continuously cast microalloy Nb-bearing steel slabs, blooms and billets have increased in importance for both the producer and the end user. The minimization of surface and internal defects has a substantial impact on steel producing operating costs, internal and external cost of quality and delivery performance. A keen and thorough understanding of the hot ductility behavior of various steel grades is essential to successfully melt and cast high quality microalloy steels. This paper describes current steelmaking and casting considerations and recommendations to successfully cast high quality niobium-bearing slabs, billets and blooms. This study also integrates the process metallurgy and the physical metallurgy to better understand the hot ductility mechanisms and process metallurgy control practices in use today for the high quality production of Nb-bearing steels.     

控制钢液过热度提高连铸坯质量与产量

连铸浇钢控制合理的过热度,可以获得低倍质量好,等轴晶粒高的连铸坯,提高连铸产量,降低拉漏率。     

Evaluation of internal and subsurface quality of continuously cast billets and slabs by ultrasonic techniques

Abstract

The paper highlights the developments made in ultrasonic techniques at R&D and SS Division of Tata Steel Ltd in detecting, measuring and analysing the continuously cast billets/slabs with respect to its internal as well as subsurface quality. Different continuously cast billets and slabs could be ranked according to their cleanliness levels even with the conventional ultrasonic flaw detector. The effectiveness of ladle furnace treatment and vacuum degassing (RH degassing) in improving cleanliness level in slabs of extra deep drawing grade and that of electromagnetic stirring in low and high carbon billets, could be successfully assessed using these techniques. In order to convert the down graded first and last slabs of a sequence of auto grade interstial free into the prime grade slabs, the scarfing depth and cutting length were optimised based on the ultrasonic results. Some results using a computer controlled ultrasonic multiscan imaging system, on continuously cast steel billets, have also been presented.     

韶钢Q345B试制精炼连铸工艺实践

韶钢120t转炉工程竣工后，以大转炉→2500中厚板轧机工艺路线成功开发生产覆盖10—40mm性能良好的Q345B板材，投入批量生产．文章着重对Al微合金化、LF炉工艺优化提高钢水纯净度和连铸工艺优化攻关进行介绍，并简要介绍连铸坯质量情况．     

S50C钢连铸试验总结

本文介绍了 S5 0 C钢连铸试验工艺及铸坯质量 ,并对所轧制钢板进行了试验研究 ,结果表明 :舞钢目前已具备生产 S5 0 C连铸坯的能力。     

Experimental and computational study of nozzle electromagnetic stirring and its effects on solidification structure

Abstract

Centreline shrinkage and segregation in continuously cast billets have an adverse effect on cast product quality. Nozzle electromagnetic stirring (N-EMS) is an effective method to refine the solidification structure of continuously cast billets and thereby improve the cast product quality. The effect of N-EMS on the solidification structure of continuously cast Sn-3·5Pb alloy has been investigated by means of experiments and numerical analysis. The results show that, upon imposing N-EMS, crystal grains within the billets are refined and continuous casting can be conducted at a lower pouring temperature; the solidification structure of the resulting obtained billets is much finer than without N-EMS. The mechanism by which the solidification structure of the billets is improved is considered to be a change in the flow and temperature distribution of molten metal in the nozzle.     

Continuous casting of billets made of a chromium-nickel titanium-containing corrosion-resistant steel

The continuous casting of a corrosion-resistant titanium-alloyed steel into billets is considered. Approaches to optimizing the chemical composition of the metal and the parameters of continuous casting are proposed to increase the quality of a continuously cast billet and the related rolled products.     

Optimisation of flash welding parameters for wheel rim manufacture using continuously cast steels

Continuously cast steels are nowadays commonly employed for the manufacture of wheel rims, and the flash welding process is generally employed for that purpose. The current work addresses the flash welding of a continuously cast material (carbon steel with carbon segregation in it), in the wheel rim manufacturing process route, with emphasis on the control of process parameters on the quality of weld joints. It has been established in this research work that the controlled post weld heat cycles, during the flash welding process, Improve the quality of joints and also eliminate or at least drastically decrease the failure susceptibility of such flash welded joints during subsequent manufacturing operations.