高速连铸用保护渣

概述了高速连铸的特点及其对结晶器保护渣的要求，给出了高速连铸用结晶器保护渣的理化性能及所应具有的成分；总结了高拉速结晶器用保护渣的研究现状。     

高速连铸用保护渣技术

概述了高速连铸的特点及对结晶器保护渣的要求，论述了高速连铸保护渣必须保证的理化性能。总结了高拉速结晶器用保护渣的研究现状，提出了今后对高速连铸保护渣研制的工作建议。     

高速连铸用保护渣技术

概述了高速连铸的特点及对结晶器保护渣的要求,论述了高速连铸保护渣必须保证的理化性能,总结了高拉速结晶器用保护渣的研究现状,提出了今后对高速连铸保护渣研制的工作建议。     

高速连铸结晶器保护渣技术

讨论了与高速连铸密切相关的保护渣技术。论述了高速连铸保护渣必须保证的理化性能；总结了高拉速结晶器用保护渣的研究现状。     

高速浇铸对结晶器保护渣的要求

结晶器保护渣对连铸工艺的稳定性起着举足轻重的作用。结晶器渣（即熔渣）的主要功能是为生长中的坯壳与结晶器之间提供充分的润滑并控制热传递。充分的润滑要求结晶器保护渣的熔化不受干扰,且结晶器渣能够均匀渗透。在荷兰艾默伊登（Umuiden）钢铁公司的浇铸实践中我们发现,在以5～6m／min的高速浇铸薄板坯时,这些要求显得更为重要。Corus RD＆ T公司用X射线衍射以及Rietveld全定量分析法描述结晶器保护渣的特征。此外,还采用高温X射线衍射现场研究了结晶器保护渣的熔化情况以获得关键的熔化关系方面的知识。利用扩展显微技术对薄板坯连铸机结晶器中的渣圈进行分析以了解渣圈的形成与生长机理。最后又描述了浇铸后所得渣膜的特征。经研究分析,我们不仅对结晶器保护渣的熔化过程,而且对渣圈的形成及生长机理都有了很深入的了解,从而可以确定更高铸速下对结晶器保护渣成分与性能的要求。     

高速连铸铸坯的润滑

通过分析连铸保护渣的物性及结晶器的振动方式对链涛坯的润滑影响，提出了适合于高速连铸的保护渣的物化性能及结晶器振动方式。     

结晶器保护渣的物理性能及其影响因素

概述了结晶器保护渣的作用，物理性能及其影响因素，指出了大板坯高速连铸对保护渣物理性能的要求。     

连铸保护渣的应用现状

介绍国内外连铸结晶器保护的发展，结晶器保护的类型，各钢种用结晶器保护渣的要求和设计，及国内钢厂研制开发结晶器保护渣的新成果。     

低碳铝镇静钢连铸用结晶器保护渣技术

一、试验为了研究结晶器保护渣的熔化和流动行为,在新日铁君津厂2号连铸机上进行了实机测试和添加示踪保护渣的试验。为了弄清因凝固坯壳与结晶器壁粘结引起拉漏的机理,还调查了拉漏板坯。 1.实机测试在连铸低碳铝镇静钢的过程中,改变保护渣成分和浇铸条件,研究结晶器保护渣特性、结晶器的散热和其他因素。浇铸期间的测试项目如表1所示。在浇铸中连续测定了结晶器铜板温度、结晶器冷却水入口与出口温差、结晶器下方的保护渣膜厚度以及其他项目。测量数据和操作数据都由高速模拟扫描仪按一秒钟的间隔记录在     

高拉速板坯连铸保护渣的应用

根据攀钢2^#板坯连铸的工艺特点，在分析了高速连铸对保护渣性能要求的基础上，研究开发出了适应高拉速浇注的连铸保护渣，工业试验结果表明，研究开发的YC—DT高拉速用连铸保护渣，在拉速≥1.70m/min时不仅结晶器内熔化状况良好，而且保护渣消耗量适宜，所浇铸坯表面质量良好，能够满足攀钢2^#板坯高速浇注的需求。     

Mould Powder Development for Continuous Casting of Steel

Mould powders significantly determine the stability of the continuous casting process of steel at all casting speeds. The main functions of mould powders are to provide strand lubrication and to control the mould heat transfer in the horizontal direction between the steel shell and the copper mould. The composition, properties and operational performance of mould powders were investigated in detail with a focus on high-speed thin slab casting and conventional slab casting. Various advanced characterisation methods were applied, completed with experiments at laboratory scale and full-scale plant trials. It was found that melting of mould powder at the meniscus and crystallisation of the slag film are key processes during continuous casting. Both powder melting and slag crystallisation are primarily based on the composition of the mould powder and the mould slag. Additionally, the operational parameters during continuous casting will affect these processes as well. Results of the work are used for a further and more fundamental understanding of the mould powder functions and to guide mould powder design for various steel grades.     

Understanding mould powders for high-speed casting

The development and application of mould powder for high-speed continuous casting of steel is described. For thin slab casting, the main requirements are proper powder melting, undisturbed slag infiltration, adequate strand lubrication and the control of mould heat transfer. For increased casting speeds i.e. up to 8?m/min, slag infiltration and in particular the control of mould heat transfer via crystallisation of the slag film becomes even more important. It was found that a low powder consumption and hence a thin slag film is no restriction for an undisturbed thin slab casting process. Given a stable casting process and machine condition, the mould powder properties are not as critical as widely assumed.     

BGX—7Ⅱ连铸保护渣的研制

根据包钢圆坯连铸机的浇铸条件,研制出一种圆坯结晶器保护渣。工业试验结果表明;研制的渣能够替代进口产品,满足圆坯Φ２３０－３５０ｍｍ断面连铸生产工艺要求。     

Development of Mould Flux for High Speed Thin Slab Casting

Mould powders impact the stability of the continuous casting process for steel at all casting speeds. The main functions of mould powder are to provide sufficient lubrication and to control the mould heat transfer between the solidifying steel shell and the copper mould. At higher casting speeds associated with thin slab casting, the role of the mould powder is even more important. Actual casting speeds for the thin slab caster at Corus IJmuiden are between 5.4 and 6 m/min; the production level is around 1.3 Mt/year (coils). It has been decided to increase the production of this caster to a level of 1.8 Mt/year (coils). In order to meet this demand, the steel in mould time has to be increased to approximately 85% and the maximum casting speed will be increased to 8 m/min. A collaborative project between Sumitomo Metal Industries (SMI) and Corus IJmuiden was initiated to develop mould powders which facilitate casting speeds up to 8 m/min at the thin slab caster. Main subjects of this project are: mould powder design, characterisation of mould powder and mould slag, trials at the pilot caster of Sumitomo and finally plant trials at the thin slab caster of Corus. A special point of attention is the condition to use mould powder as a granulated material at the thin slab caster. As a consequence, the characterisation work focussed on the choice of raw materials and on the corresponding phase relations at elevated temperatures. Typical of the developed mould powders are so‐called mild cooling properties which will result in a controlled mould heat transfer during casting. In this paper, several aspects of this joint project between Sumitomo and Corus will be described.     

外加液态保护渣连铸生产实践与前景展望

 外加液态保护渣可以提高铸坯质量和可浇性。在某厂板坯连铸机上,分别采用液态保护渣和固态保护渣进行多钢种浇注试验,对比液态保护渣和固态保护渣消耗量、结晶器温度分布、拉坯摩擦力及铸坯质量,并对液态保护渣的应用前景进行展望。结果显示,液态保护渣比固态保护渣消耗量增加60%左右,结晶器温度分布更均匀,连铸拉坯摩擦力降低约15%,铸坯质量有所提高。这说明在连铸过程中,液态保护渣使结晶器和铸坯间传热更均匀;液态保护渣润滑效果更好,可以提高铸坯质量。同时,有望不添加F-、Na+等有害离子,改善环保问题。     

连铸结晶器检测控制技术的新发展

详尽介绍了到目前为止所开发及使用的各种传感器及其功能与应用范围，如：连铸机结晶器铜板温度的测量、检测结晶器中钢水液位所用仪表、结晶器振荡的监测，结晶器和板坯之间摩擦力的检测。测量结晶器铜板壁和铸坯之间缝隙中的渣膜厚度和结晶器内钢水池上熔融保护渣层深度的技术……等等。阐述了这些检测控制技术对连铸技术发展所起的重要作用。在建新连铸机或改造老连铸机时，必须采用各种行之有效的检测和控制方法，并不断开发新方     

国内外超低碳钢连铸结晶器保护渣的设计与应用

简述了连铸超低碳钢时铸坯增碳的机理 ,介绍了国内外在设计和研制超低碳钢用连铸保护渣时为防止铸坯增碳而采取的各种技术措施及实际应用效果。对攀钢开发超低碳钢用连铸保护渣提出了建议。