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Treating method for molten plain carbon steel used for continuous casting of slab

A technology of slab continuous casting and processing method, applied in the field of iron and steel metallurgy, can solve problems such as insufficient improvement of pourability, achieve the effect of good promotion and application prospects, ensure stable and smooth running, and easy to control operation

Active Publication Date: 2017-04-19
PANGANG GRP PANZHIHUA STEEL & VANADIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Aiming at the traditional solution to the problem of insufficient castability improvement during slab continuous casting of ordinary carbon steel, the present invention provides appropriate control of alloying, slag formation, and moderate oxygen activity in molten steel during the smelting and refining process. The process of feeding aluminum wire into molten steel can effectively control the level and state of inclusions in molten steel. It is easy to operate and control in the smelting and refining operation site, and can stably control the state of inclusions in molten steel, improving the continuous casting of this type of steel. The pourability of water ensures the quality of continuous casting products. Up to now, there is no proposal about adopting proper slag treatment, rational selection of deoxidizing materials, and accurate control of oxygen activity in the process of slab continuous casting common carbon steel molten steel. Degree (according to Al-Si-O relationship control [O]) process method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1: processing steel type Q235 (G)

[0028] 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.

[0029] The implementation of the molten steel treatment method for slab continuous casting common carbon steel is as follows:

[0030] The amount of molten steel is 133.5 tons, 345Kg of ferrosilicon and 347Kg of silicon-manganese alloy are added during tapping, and 202Kg of lime (CaO content>90%) is added during tapping. The argon station behind the furnace fixed the oxygen at 128ppm, fed the aluminum wire 303g / t steel, when the molten steel arrived at the refining furnace, the temperature was measured at 1580°C, and the composition of 0.14%C, 0.19%Mn, 0.12%Si, 0.003%Al was added to the station. Refining slag (CaO content>70%, CaF2>10%, SiO 2 2 o 3 <7%) 151Kg, aluminum pellets 15Kg, heating time 4 minutes, fixed oxygen 48ppm, fed aluminum wire 95g / t steel, outbound fixed oxygen 18pp...

Embodiment 2

[0031] Embodiment 2: processing steel type Q235-DG

[0032] 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.

[0033]The implementation of the molten steel treatment method for slab continuous casting common carbon steel is as follows:

[0034] The amount of molten steel is 129.31 tons, 283Kg of ferrosilicon and 237Kg of silicon-manganese alloy are added during tapping, and 211Kg of lime (CaO content>90%) is added during tapping. The argon station behind the furnace fixed the oxygen at 142ppm, fed the aluminum wire 339g / t steel, and when the molten steel arrived at the refining furnace, the temperature was measured at 1578°C, and the composition of 0.15%C, 0.15%Mn, 0.11%Si, 0.003%Al was added to the station for sampling and testing. Refining slag (CaO content>70%, CaF2>10%, SiO 2 2 o 3 <7%) 102Kg, aluminum grain 17Kg, ferrosilicon 71Kg, heating time 6 minutes, constant oxygen 72ppm, feed...

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PUM

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Abstract

The invention relates to a treating method for molten steel, especially to a treating method for molten plain carbon steel used for continuous casting of a slab, belonging to the field of ferrous metallurgy. To stably control the state of inclusions in the molten steel, improve castability of molten plain carbon steel for continuous casting and guaranteeing the quality of a product of continuous casting, the treating method provided by the invention employs the following concrete steps: A, tapping of molten steel: adding ferrosilicon and silicomanganese alloy during tapping of molten steel obtained through smelting of a primary smelting furnace and adding slag charge with CaO content of greater than CaO during tapping; B, argon blowing of an argon station for oxygen determination and feeding of aluminum wires; and C, LF refining: adding refining slag and aluminum particles into a finery, successively carrying out heating, oxygen determination feeding of aluminum wires and oxygen determination out of the station, and controlling the temperature of the molten steel so as to obtain the molten plain carbon steel used for continuous casting of the slab. The treating method provided by the invention improves tapping and alloying process and slagging control techniques so as to overcome the problem of poor castability of the molten plain carbon steel used for continuous casting, enhance the cleanness of the molten plain carbon steel and guarantee stable and smooth operation and economic benefits of continuous casting production.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and relates to a method for processing molten steel, in particular to a method for processing molten steel for slab continuous casting common carbon steel. Background technique [0002] Slab continuous casting ordinary carbon steel is widely used in various fields due to its economy and easy processing, so it has a large proportion of production in steel mills. The general composition design feature of this type of steel is low-carbon, low-silicon, low-manganese killed steel, and the general basic composition range is [C]: 0.05%-0.20%, [Si]: 0.10%-0.50%, [Mn] 0.10%-0.65%. [0003] At present, for slab continuous casting of ordinary carbon steel, although the production volume of this type of steel is large, due to the low content of C and Si in the steel, the molten steel is easy to be oxidized again, and there are nodules in the molten steel during continuous casting, difficul...

Claims

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Application Information

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IPC IPC(8): C21C7/00C21C7/06C21C7/072C21C7/076
CPCC21C7/0006C21C7/06C21C7/072C21C7/076Y02P10/20
Inventor 赵启成
Owner PANGANG GRP PANZHIHUA STEEL & VANADIUM