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国内某炼钢厂为保证浇注周期较短的2号连铸机连浇,多座转炉需同时向该连铸机供应钢水,导致炉 机对应关系不明确,生产组织难度较大。通过对该厂炼钢 连铸过程的工序作业周期与生产运行模式进行解析,在保证连铸机连浇的基础上,探究合理的炉 机对应关系,改善该厂的生产顺行。结果表明,在“一一对应”运行模式下,2号连铸机最大连浇炉数仅为6炉;而在“定炉对定机”运行模式下,若适时接受3号转炉冶炼的钢水,2号连铸机最大连浇炉数可延长至19炉。在此基础上,通过对连铸机“柔性”的优化和钢水供应的合理调配,2号连铸机可满足实际生产的连浇要求。此外,运用“炉→机”匹配度进行评价,计算结果表明优化后的炉 机对应关系得到显著改善。 相似文献
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多炉连浇是充分发挥连铸机优越性,实现高产、优质、低耗、高效的有力措施,它将连铸生产的组织管理及工艺操作科学地统一起来,创造高的经济效益。本文分析了多炉连浇的工艺参数,总结了提高连浇炉数的操作工艺及管理方面的措施。 相似文献
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邢钢一步法(脱磷站+60 t AOD+LF)生产410S不锈钢过程中,由于AOD的冶炼周期远大于连铸机浇钢和脱磷站的处理时间和连铸中间包水口下部侵蚀严重无法实现多炉连浇,严重影响连铸机作业率和整体钢铁料消耗。提高单中间包连浇炉数有利于减少中间包的使用数量、提高连铸机的作业率、降低钢铁料消耗、降低连铸机辅材及能源介质消耗。通过合理提高入炉冷态返回废钢比例(3.5t/炉),选择合适合金硅含量(3.5%)来缩短410S不锈钢AOD的冶炼周期至71 min,连铸机采用中间包分体水口快换,使连浇炉数由6炉提高到12炉。 相似文献
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通过对天津钢管公司炼钢厂150t超高功率电弧炉与1台4流弧型圆坯连铸机进行多炉连浇的匹配方式分析,认为LF炉是协调电炉与连铸机生产节奏不平衡实现多炉连浇最重要的工序,并提出了有关改进匹配方式,提高连浇水平的途径和措施。 相似文献
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连铸新技术主要体现在:连铸机的高生产率(作业率、拉速、设备可靠)和连铸坯的质量(铸坯洁净度、铸坯表面缺陷、铸坯内部缺陷)。1提高连铸机生产率1.1提高连铸机作业率目前在钢铁工业发达国家,现代化大型板坯连铸机的作业率已达90%以上,方坯连铸机的作业率也在90%以上,有的甚至达到了95%。提高连铸机作业率的措施:(1)提高连浇炉数。国外钢厂板坯连浇炉数在1500炉以上,方坯在1000炉以上。(2)提高结晶器的使用寿命。在日本结晶器寿命由200 ̄300炉提高到1000 ̄3000炉。(3)结晶器下部钢板采用多层电镀、先镀Ni再镀磷化物和Cr,并改变镀层范围和厚… 相似文献
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分析了济钢三炼钢厂1#连铸机中间包连浇炉数偏低的原因,通过改进中间包预热与烘烤制度、连铸功能耐材、低过热度浇注等,提高了中间包的连浇炉数,达到了降低成本、提高连铸机作业率的目的。 相似文献
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介绍了莱钢炼钢厂3连铸机小方坯保护浇注工艺以及对耐火材料的改进措施,实践证明,采用保护浇注工艺,铸坯检验合格提高,缺陷减少。 相似文献
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球形空心颗粒状连铸保护渣的开发与应用 总被引:4,自引:0,他引:4
概述了球形空心颗粒状况保护渣的优点,立足于攀枝花资源条件开发,生产保护渣的工艺流程及其在攀钢1350板坯连铸机上的使用效果。 相似文献
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济钢钢研所在济钢第一炼钢厂4#铸机上进行了5炉结晶器喂铝丝工艺试验,通过合理控制喂丝工艺参数,连铸浇注顺利,钢中酸溶铝达到0.015%以上,改善了铸坯质量和钢材性能。 相似文献
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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. 相似文献
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For a two‐strand slab caster and a tundish capacity of 50 t the transition zone between two heats of different chemical composition was experimentally defined. The distribution of various elements was measured. The transition curves also show the penetration depth of the casting stream using a bifurcated submerged nozzle. This is basic information for the calculation of the mixing zone. Knowledge of the permissible composition ranges permits optimisation of the usable length of the strand. The impact of ladle change on oxide cleanness is analysed as well. 相似文献