Deoxygenating method for molten steel smelting

A technology of molten steel smelting and deoxidizer, which is applied to the improvement of process efficiency, electric furnace, furnace, etc., can solve the problems of increasing the tendency of hot tearing of castings, the impact of casting performance, and failure to overcome, so as to achieve the improvement of mechanical properties and plasticity indicators, and improve mechanical properties. Performance, effect of improving purity

Inactive Publication Date: 2015-10-07
KOCEL STEEL
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AI Technical Summary

Problems solved by technology

[0003] Deoxidation with silicon and manganese alloy deoxidizers will cause a sharp increase in silicate inclusions, which will gather around the grain boundaries in the later stage of molten steel solidification, increasing the tendency of hot tearing of castings
The deoxidation product of the aluminum-based deoxidizer is a chain Al with a melting point as high as 2030°C 2 o 3 , not easy to be discharged from the molten steel, and the inclusions formed by deep deoxidation of the molten steel are not conducive to floating, and finally form a chain distribution at the grain boundary, which not only has a great impact on the performance of the casting, but also greatly reduces the purity of the molten steel
[0004] There is currently no method to overcome the above drawbacks

Method used

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Embodiment Construction

[0016] A deoxidation method for molten steel smelting comprises a deoxidation process for molten steel in an electric arc furnace and a deoxidation process for molten steel in a refining furnace.

[0017] The deoxidation process of molten steel in the described electric arc furnace comprises:

[0018] 1) Selection of deoxidizer type

[0019] Use silicon-aluminum-calcium-barium deoxidizer. During electric arc furnace smelting, the molten steel does not need to be stirred, and block deoxidizer is used.

[0020] 2) How to join

[0021] During the rough smelting of the electric arc furnace, after the molten steel is decarburized, it is boiled quietly for 5-10 minutes, and the aluminum block is directly inserted for deoxidation. The speed is fast out of steel. Add silicon-aluminum-calcium-barium into the ladle before tapping, and use the stirring of molten steel to promote the deoxidation reaction during the tapping process.

[0022] 3) Amount added

[0023] The amount of sili...

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Abstract

The invention relates to a deoxygenating method during smelting, in particular to a deoxygenating method for molten steel smelting. The deoxygenating method for molten steel smelting comprises a deoxygenating method of molten steel in an arc furnace and a deoxygenating method of molten steel in a refining furnace. The deoxygenating method for molten steel smelting is unique, molten steel is deoxygenated by using composite deoxygenating agent, the mass fraction of the main residual elements in the deoxygenating agent is controlled, the purposes of reducing the size of inclusions in molten steel and improving the shape of the inclusions are realized, the number of the inclusions is reduced, the purity of molten steel is improved and the mechanical property of castings is improved at the same time.

Description

technical field [0001] The invention relates to a deoxidation method during smelting, in particular to a deoxidation method for molten steel smelting. Background technique [0002] The cast steel smelting process usually uses the smelting method of electric arc furnace plus ladle refining furnace. At present, more than 80% of electric arc furnace smelting adopts oxidation process, which mainly removes inclusions and gases in molten steel through oxygen blowing decarburization process, and molten steel also accumulates a large amount of free oxygen. In actual production, silicon and manganese alloys are mainly used for pre-deoxidation of molten steel in electric arc furnaces, and aluminum-based deoxidizers are used for final deoxidation, while silicon-based and aluminum-based deoxidizers are mainly used for process oxygen content control in refining furnaces. [0003] The use of silicon and manganese alloy deoxidizers for deoxidation will cause a sharp increase in silicate i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/52C21C7/06
CPCY02P10/20
Inventor 胡进林唐钟雪张生存王平赵国伟龚明健
Owner KOCEL STEEL
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