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为适应对制件质量提出的高要求,研究制定了连铸坯内部组织的控制方法。这些组织的质量取决于在小型坯,大钢坯和板坯中心区域发现的诸如偏析,夹杂物聚积和疏松等缺陷的发展程度。由于电磁场能使铸坯液芯产生对流,因此,对二次冷却区内的铸坯产生影响的电磁场是控制上述组织缺陷的可靠方法。与其它的控制方法相比较,电磁搅拌是更为经济的方法,因为,这种方法能帮助冶金工作者选择不同的浇铸参数。本文列举了法国钢铁研究院对连铸机二次冷却区内的金属使用电磁搅拌所获得的结果。记述了全过程的冶金问题以及浇铸加长坯,扁坯的控制工艺和该方法的主要优点。与模铸比较,连铸主要的一个优点是能够控制铸坯的凝固过程。模铸时,冶金工作者实质上不可能把凝固过程中出现的各科现象阐述清楚。但是,由于在轧制过程中钢锭经受高度变形,所形成的组织缺陷对成品质量的影响是可能限制的。连续浇铸时,铸坯的形状和尺寸,拉坯速度,浇铸温度和冷却均匀性等参数能够改变凝固过程。因此,尽管铸坯的变形程度比一般钢锭的小,但是,连铸时仍能够控制钢水的凝固过程并限制上述参数对轧材性能的影响。连铸时,只要严格遵守连铸机的操作规程,就能够得到质量更高的产品。为了改善金属的质量并使其保持在很高的水平上,法国钢铁研究院在欧州轧钢联营(ECSC)的财政支持下,完善了连铸机二次冷却区内的板坯液芯电磁搅拌工艺。
In order to meet the high demands made on the quality of the parts, the control method of the internal structure of the continuous casting slab was developed. The quality of these organizations depends on the degree of development of defects such as segregation, accumulation of inclusions and porosity found in the center of the small billet, bloom and slab. Since the electromagnetic field can cause convection of the slab liquid core, an electromagnetic field that affects the slab in the secondary cooling zone is a reliable method of controlling the above-mentioned microstructure defects. Compared with other control methods, electromagnetic stirring is a more economical method, because this method can help metallurgical workers choose different casting parameters. This article lists the results obtained by the French Institute of Iron and Steel using electromagnetic stirring of the metal in the secondary cooling zone of the caster. Described the metallurgical problems of the whole process as well as the casting long blank, the control process of the slab and the main advantages of the method. One of the main advantages of continuous casting compared with mold casting is the ability to control the solidification of the slab. When molding, it is virtually impossible for metallurgists to articulate the various subjects that appear during solidification. However, the effect of the resulting microstructure defects on the quality of the finished product is likely to be limited due to the highly deformed steel ingots during the rolling process. Continuous casting, the shape and size of the slab, casting speed, casting temperature and cooling uniformity and other parameters can change the solidification process. Therefore, although the billet is less deformed than the steel ingot, the solidification of the molten steel can be controlled and the influence of the above parameters on the properties of the rolled steel can be restricted. Continuous casting, as long as strict adherence to the continuous casting machine operating procedures, we can get higher quality products. In order to improve the quality of the metal and keep it at a high level, the French Institute of Iron and Steel has improved the electromagnetic stirring process of the slab liquid core in the secondary cooling zone of the caster under the financial support of the European Steel Rolling Stock Joint (ECSC) .