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Electric furnace smelting method for low-carbon low-silicon steel

An electric furnace smelting, low-carbon and low-silicon technology, applied in the direction of electric furnaces, furnaces, furnace types, etc., can solve the problems that cannot be used to produce low-carbon and low-silicon steel, and achieve the goal of expanding smelting and processing capacity, highlighting economic benefits, and reducing production costs Effect

Inactive Publication Date: 2008-07-23
XINJIANG BAYI IRON & STEEL
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Problems solved by technology

However, the inventive process can only be used to smelt low-carbon steel, but not to produce low-carbon and low-silicon steel, so there are still great limitations in production

Method used

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  • Electric furnace smelting method for low-carbon low-silicon steel
  • Electric furnace smelting method for low-carbon low-silicon steel
  • Electric furnace smelting method for low-carbon low-silicon steel

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Embodiment Construction

[0032] An electric furnace smelting method for low-carbon and low-silicon steel comprises the following smelting processes in sequence: an electric furnace smelting process, an LF ladle furnace refining process and a continuous casting process.

[0033] Electric furnace process: take a 110-ton AC electric arc furnace as an example to illustrate. In the electric furnace smelting process, molten iron or iron nuggets should be added to the electric furnace ingredients added. The amount of molten iron or iron nuggets accounted for 35% of the total amount of ingredients loaded. If conditions permit, add 15% of direct reduced iron. The total load is controlled at around 115 tons. The amount of lime to be added is 6500kg per furnace, and dolomite is added to 1800kg per furnace, which is added to the first blue material.

[0034] In the early stage of smelting, high-grade power transmission is adopted, and the current intensity is kept at 70-90kA, so as to shorten the melting time of...

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Abstract

The invention relates to an electric furnace smelting process for low carbon and low silicon steel, which comprises in series a electric furnace smelting process, a LF ladle furnace refining working procedure and a continuous casting working procedure; wherein, the refining slag adopted in the refining working procedure is CaO-Al2O3-CaF2 in which the content of CaO is 55 percent to 60 percent, the content of Al2O3 is 15 percent to 20 percent and the content of CaF2 is 1 percent to 5 percent, the content ratio of CaO and SiO2 is larger than 100; 50 percent to 60 percent Al2O3 complex slagging medium is added into the ladle at the prophase the refining, the addition of the slagging medium is 3 to 4 kg per ton steel, and the alkalinity of the slag in the ladle is adjusted; before the refining working procedure is over, the feed quantity of the wire feeding is less than 3m pre ton steel, and then the soft blowing procedure lasts 10 minutes after the wire feeding and the sedation lasts 5 to 10 minutes, the white slat in the furnace is kept for 10 minutes before tapping; in the continuous casting working procedure, the long nozzle of the ladle utilizes shielding argon gas and is sealed by aluminum silicate fiber felt sealing gasket, the overheat of the furnace shift and the first furnace in continuous casting is less than 50 degrees C and the overheat of the other continuous casting furnace is less that 30 degrees C. The electric furnace smelting process for low carbon and low silicon steel has the advantages of concise craft and low cost and can be used to produce low carbon low silicon steel.

Description

technical field [0001] The invention relates to an electric furnace steelmaking method, in particular to an electric furnace smelting method for low-carbon and low-silicon steel. Background technique [0002] At present, electric furnaces used in domestic iron and steel enterprises are mainly used to produce medium-high carbon steel, while low-carbon low-silicon steel (SPHC) is mainly produced by converter, and its process is: converter-continuous casting-steel rolling. Converter production uses molten iron as the main raw material, and the steel billets it produces contain less trace elements and harmful elements, and the inner quality of the billets produced is better than that of electric arc furnaces that use scrap steel as the main raw material. In terms of smelting control, due to the different processes, the end point control of low carbon and low silicon steel produced by converter is also easier than that of electric furnace end point control. Since the production ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/52C21C7/00B22D11/16
CPCY02P10/20
Inventor 宋维兆雷洪张建新陈跃军穆保安
Owner XINJIANG BAYI IRON & STEEL
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