Slab continuous casting plain carbon steel LF desulphurization method

Abstract

The invention relates to the field of ferrous metallurgy methods, in particular to a slab continuous casting plain carbon steel LF desulphurization method capable of effectively improving pourabilityof continuous casting molten steel of slab continuous casting plain carbon steel. The method comprises the following steps that a, molten steel LF feeding operation, wherein the weight of molten steelis confirmed, molten steel components are sampled and tested, the temperature of the molten steel is measured, and the oxygen content of the molten steel is measured; b, LF slagging, wherein parameters measured through sampling in the step a are added into refining slag to achieve desulphurization, and main components of the refining slag are CaO-CaF2; and c, after treatment of the step b is completed, the molten steel is discharged out of the station. According to the method, during smelting refining operation, field operation is simple, control is easy, the molten steel inclusion state canbe stably controlled, the pourability of the continuous casting molten steel of this steel type can be improved, the quality of continuous casting products can be guaranteed, and high economic benefits are achieved. The method is especially suitable for the slab continuous casting plain carbon steel LF desulphurization process.

Description

Technical field [0001] The invention relates to the field of steel metallurgy methods, in particular to a LF desulfurization method for slab continuous casting plain carbon steel. Background technique [0002] Sheet carbon steel is widely used in various fields due to its economy and ease of processing. Therefore, it has a large production proportion in steel plants. The universal composition design feature of this type of steel is low carbon, low silicon, low manganese silicon killed steel, the general basic composition range is [C]: 0.05%-0.20%, [Si]: 0.10%-0.50%, [Mn ] 0.10%-0.65%. The production volume of this type of steel is large, but the problem is also more prominent. This is that the pourability of molten steel during continuous casting is difficult to accurately control, the problem of nozzle clogging is easy to occur in the continuous casting process, the Al content in steel is difficult to accurately control, and molten steel is easy to control. Secondary oxidation...

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Problems solved by technology

[0004] For the process flow of the steel plant: desulfurization - converter - LF - slab continuous casting, the desulfurization process of the steel plant cannot achieve the removal of sulfur from all molten iron to meet the S component requirements of continuous casting, and some heats enter the post process - mainly slab refining LF Remedial desulfurization is carried out in the process. About 15% of the heats of slab ordinary carbon steel need to be desulfurized. For slab ordinary carbon steel, due to the quality of continuous casting slabs, it is generally required to control the molten steel [S] below 0.020%, and this Some slabs of ordinary carbon steel need to be desulfurized. The S of the LF entering the station fluctuates between 0.021% and 0.080%, and the sulfur after desulfurization fluctuates between 0.005% and 0.028%. Large fluctuations in casting production and high consumption of desulfurization slag make LF cost uncontrollable. Therefore, it is necessary to explore the desulfurization process of slab ordinary carbon steel, provide a set of on-site desulfurization strategies, and find a solution The method of the thorny problem of desulfurization of ordinary carbon steel is of great significance to the stable and smooth production of slab ordinary carbon steel continuous casting

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