Slab continuous casting plain carbon steel LF desulphurization method

A technology of slab continuous casting and ordinary carbon steel, applied in the field of iron and steel metallurgy, can solve the problems of high consumption of slag for desulfurization, fluctuation of slab continuous casting production, uncontrolled LF cost, etc. The effect of improving pourability and stably controlling the state of inclusions in molten steel

Active Publication Date: 2020-07-31
PANGANG GRP PANZHIHUA STEEL & VANADIUM
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

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

Method used

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  • Slab continuous casting plain carbon steel LF desulphurization method

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Experimental program
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Effect test

Embodiment 1

[0024] Processing steel grade Q235-DG.

[0025] For the treatment of steel grade Q235-DG, the basic requirements for steel grade composition: 0.13%-0.20%C, 0.10%-0.20%Mn, 0.10%-0.20%Si. The implementation of the slab continuous casting common carbon steel molten steel treatment method is as follows:

[0026] The amount of molten steel is 132.1 tons, the LF enters the station to determine the oxygen 46ppm, and the temperature is measured at 1569℃. The aluminum wire is fed 80g / t steel, measuring 96 meters (aluminum wire unit weight 0.2Kg / m), and the incoming sampling test composition is 0.14%C, 0.15 %Mn, 0.12%Si, 0.003%Al, S0.037%, add refining slag (CaO content> 65%, CaF 2 > 10%, other components are SiO 2 , Al 2 O 3 Etc.) 840Kg, aluminum particles 50Kg, fluorite 160Kg, heating time 19 minutes, fixed oxygen 6ppm, temperature measurement is 1587℃, outbound sampling test composition 0.15%C, 0.15%Mn, 0.13%Si, 0.008%Al, S0. 016%, good pourability during continuous casting.

Embodiment 2

[0028] Processing steel grade Q235 (G).

[0029] For the treatment of steel grade Q235 (G), the steel grade composition level requirements are: 0.13%-0.18% C, 0.15%-0.35% Mn, 0.10%-0.25% Si.

[0030] The implementation of the slab continuous casting common carbon steel molten steel treatment method is as follows:

[0031] The amount of molten steel is 130.9 tons, the LF enters the station to determine the oxygen concentration of 34ppm, and the temperature is measured at 1572℃. The incoming samples are tested for components of 0.15% C, 0.21% Mn, 0.12% Si, 0.003% Al, and S 0.051%. 65%, CaF 2 > 10%, other components are SiO 2 , Al 2 O 3 Etc.) 1280Kg, aluminum particles 70Kg, fluorite 250Kg, heating time 26 minutes, constant oxygen 5ppm, temperature measurement is 1585℃, outbound sampling test composition 0.16% C, 0.22% Mn, 0.13% Si, 0.009% Al, S0. 018%, good pourability during continuous casting.

[0032] The invention can ensure that under the premise of effectively improving the castab...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/064C21C7/06C21C7/00C21C7/072
CPCC21C7/064C21C7/06C21C7/0006C21C7/072C21C7/0056
Inventor 赵启成
Owner PANGANG GRP PANZHIHUA STEEL & VANADIUM
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