Smelting method of low-carbon aluminium killed steel with low silicon content

A technology of low-carbon aluminum-killed steel and a smelting method, which is applied in the field of steelmaking in the metallurgical industry, can solve problems such as inapplicability of aluminum-killed steel, and achieve the effects of low production cost and low energy consumption

Active Publication Date: 2011-07-27

HEBEI IRON AND STEEL

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AI-Extracted Technical Summary

Problems solved by technology

However, the above-mentioned process method is not suitable for blast furnace vanadium-containing molt...

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Abstract

The invention relates to a smelting method of the low-carbon aluminium killed steel with a low silicon content, belonging to the steelmaking technical field of the metallurgy industry. The technical scheme in the invention is as follows: before blast furnace vanadium-containing molten iron enters the steelmaking process, the processes of vanadium extraction and silicon removal are performed, the steelmaking process adopts the semi-steel smelting process, low-silicon pre-melted composite refining slag is added in molten iron during the slag-stopping tapping process, the deoxidizing process andthe alloying process for pre-deoxidation; after molten iron enters the ladle furnace (LF) refining process, the conventional mode for preparing white slag through electrode heating is not adopted, white slag is rapidly prepared by covering a cover for heat preservation and using aluminum powder as a deoxidizer in the reducing atmosphere of argon stirring; then calcium treatment and argon soft blowing are performed, the thermodynamic and dynamical conditions of the silicon kickback of molten steel are inhibited under the premise of ensuring the refining quality; and after the argon soft blowing of molten steel is completed, molten steel enters the continuous casting process. By adopting the method, the Si element qualification rate of the low-silicon and low-carbon aluminium killed steel is up to more than 98%; and as the refining electrode heating process is not adopted, the method is characterized by low energy consumption, environmental protection and low production cost.

Technology Topic

AluminiumSmelting process +13

Examples

Experimental program(3)

Example Embodiment

[0024] Example 1:

[0025] Production steel grade SPHC, molten iron [C] 4.50%, [Si] 0.60%, molten iron temperature 1230°C; semi-steel [C] 4.00%, [Si] 0.003%, molten iron temperature 1330°C after vanadium extraction; semi-steel undergoes converter smelting After tapping, the molten steel [C] 0.02%, [Si] 0.008%, Als 0.02%, and the temperature is 1613℃; after the molten steel enters the aluminum feeding line of the refining station, the molten steel [C] 0.02%, [Si] 0.01%, Als 0.05% , Temperature 1606℃; after refining, molten steel [C] 0.04%, [Si] 0.02%, Als 0.045%, temperature 1576℃; finished steel billet chemical composition [C] 0.04%, [Si] 0.020%, Als 0.040%.

Example Embodiment

[0026] Example 2:

[0027] Steel production: export low-silicon SPHT1, molten iron [C] 4.41%, [Si] 0.50%, molten iron temperature 1220℃; semi-steel [C] 3.98%, [Si] 0.01% after vanadium extraction, molten iron temperature 1336℃; half After the steel is tapped by converter smelting, the molten steel [C] 0.02%, [Si] 0.005%, Als 0.02%, and the temperature is 1608℃; after the molten steel enters the refining station to feed the aluminum wire, the molten steel [C] 0.02%, [Si] 0.009% , Als 0.05%, temperature 1600℃; after refining, molten steel [C] 0.05%, [Si] 0.01%, Als 0.045%, temperature 1570℃; the chemical composition of the finished steel billet [C] 0.05%, [Si] 0.010%, Als 0.040%.

Example Embodiment

[0028] Example 3:

[0029] Steel production: export low-silicon SS400, molten iron [C] 4.96%, [Si] 0.65%, molten iron temperature 1218℃; semi-steel after vanadium extraction [C] 4.25%, [Si] 0.006%, molten iron temperature 1310℃; half After the steel is tapped by converter smelting, the molten steel [C] 0.04%, [Si] 0.008%, Als 0.03%, and the temperature is 1612℃; after the molten steel enters the aluminum feeding line of the refining station, the molten steel [C] 0.04%, [Si] 0.015% , Als 0.035%, temperature 1604℃; after refining, molten steel [C] 0.10%, [Si] 0.03%, Als 0.030%, temperature 1578℃; the chemical composition of the finished steel billet [C] 0.11%, [Si] 0.03%, Als 0.030%.

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Description & Claims & Application Information

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the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine

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