Slab continuous casting common carbon steel lf desulfurization method

A technology of slab continuous casting and ordinary carbon steel, which is applied in the field of iron and steel metallurgy, can solve the problems of high consumption of desulfurization slag, fluctuation of slab continuous casting production, uncontrolled LF cost, etc., to improve the castability of molten steel, Effects of improving castability and stabilizing the state of inclusions in molten steel

Active Publication Date: 2022-03-22
PANGANG GRP PANZHIHUA STEEL & VANADIUM
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  • Abstract
  • Description
  • Claims
  • 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 common carbon steel lf desulfurization method

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Effect test

Embodiment 1

[0024] Handle steel grade Q235-DG.

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

[0026] The amount of molten steel is 132.1 tons, the LF enters the station to fix the oxygen at 46ppm, the temperature is measured at 1569°C, the aluminum wire is fed 80g / t steel, and the total is 96 meters (the single weight of the aluminum wire is 0.2Kg / m). %Mn, 0.12% Si, 0.003% Al, S0.037%, adding 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 1587°C, outbound sampling and testing composition 0.15%C, 0.15%Mn, 0.13%Si, 0.008%Al, S0. 016%, good pourability during continuous casting.

Embodiment 2

[0028] Handle steel grade Q235(G).

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

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

[0031] The amount of molten steel is 130.9 tons, the LF enters the station to fix oxygen at 34ppm, and the temperature is measured at 1572°C. The composition of the incoming sample is 0.15%C, 0.21%Mn, 0.12%Si, 0.003%Al, S0.051%, adding refining slag (CaO content> 65%, CaF 2 >10%, other components are SiO 2 、Al 2 o 3 etc.) 1280Kg, aluminum particles 70Kg, fluorite 250Kg, heating time 26 minutes, fixed oxygen 5ppm, temperature measurement 1585°C, 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 effectively improve the pourability of molten steel, control the LF desulfurizat...

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Abstract

The present invention relates to the field of iron and steel metallurgy methods, in particular to a LF desulfurization method for slab continuous casting common carbon steel that effectively improves the pourability of continuous casting molten steel for slab continuous casting common carbon steel, comprising the following steps: a, molten steel LF Entry operation: determine the weight of molten steel, take samples to test the composition of molten steel, measure the temperature of molten steel, and measure the oxygen content of molten steel; b, LF slagging: according to the parameters measured in step a sampling, adding refining slag for desulfurization, the main component of the refining slag is CaO‑CaF 2 ; c. After step b is processed, exit the station. The invention is simple to operate and easy to control at the smelting and refining operation site, can stably control the state of molten steel inclusions, improves the castability of continuous casting molten steel of this type of steel, ensures the quality of continuous casting products, and has high economic benefits. The invention is especially suitable for the LF desulfurization process of slab continuous casting ordinary carbon steel.

Description

technical field [0001] The invention relates to the field of iron and steel metallurgy methods, in particular to a LF desulfurization method for slab continuous casting common carbon steel. Background technique [0002] Plate plain carbon steel is widely used in various fields due to its economy and ease of processing. Therefore, it accounts for a large proportion of production in steel mills. The general composition design feature of this type of steel is silicon-killed steel with low carbon, low silicon and low manganese. 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 problems are also more prominent, that is, it is difficult to accurately control the pourability of molten steel during continuous casting, and the problem of nozzle blockage is easy to occur during continuous casting, the Al content in the steel is difficult to accurately control, and the molten stee...

Claims

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Application Information

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Patent Type & Authority Patents(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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