A Calcium-Free Treatment Killed Clean Steel Production Process
A production process and technology for clean steel, applied in the field of iron and steel metallurgy, can solve the problems of limiting the production efficiency of thin slab continuous casting, affecting the formability of steel plates, CaS inclusions, etc., to meet the requirements of cleanliness and pourability, and to save the cost of calcium treatment , the adsorption effect is obvious
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Embodiment 1
[0042] (1) Molten iron: reduce the sulfur content of the molten iron to less than 0.02% by means of pretreatment of the molten iron;
[0043] (2) Oxygen top-bottom combined blowing converter: adopt sub-lance technology and bottom blowing argon technology to control the molten steel [O] at the end of the converter 2 o 3 The total amount of deoxygenated inclusions.
[0044] (3) LF Refining: Adjust refining incoming molten steel [Al] 0.030-0.060%, molten steel temperature ≥ 1550°C; add lime at 8-12Kg / ton, control slag composition to be CaO 55-60%, Al 2 o 3 35-40%; SiO 2 3~4%; MgO 5~7%, alkalinity CaO / SiO 2 The value is 20-26; white slag is produced by refining; the aluminum composition of molten steel is adjusted, and the number of times of aluminum mixing is less than 3 times, specifically twice in this embodiment; 500 meters of limestone cored wire is fed; the silicon content of molten steel is 0.025-0.035%; refining out of the station The mass percentage of molten steel ...
Embodiment 2
[0061] (1) Molten iron: reduce the sulfur content of the molten iron to less than 0.02% by means of pretreatment of the molten iron;
[0062] (2) Oxygen top-bottom double-blown converter: adopt sub-lance technology and bottom-blown argon technology to control the molten steel at the end point of the converter [O] 2 o 3 The total amount of deoxygenated inclusions.
[0063] (3) LF Refining: Adjust refining incoming molten steel [Al] 0.04-0.06%, molten steel temperature ≥ 1550°C; add lime at 9Kg / ton, control slag composition to be CaO 57-60%, Al 2 o 3 35-40%; SiO 2 2~3.5%; MgO 5~7%, alkalinity CaO / SiO 2 The value is 22~25; white slag is produced by refining; the aluminum composition of molten steel is adjusted, and the number of times of aluminum blending is 2 times; the silicon content of molten steel is 0.025~0.035%; 0.025-0.035%, Mn: 0.08-0.20%, P≤0.015%, S≤0.003%, Alt: 0.015-0.040%, and the balance is iron and trace unavoidable impurities. Adjust the content of acid-so...
Embodiment 3
[0077] (1) Molten iron: reduce the sulfur content of the molten iron to less than 0.02% by means of pretreatment of the molten iron;
[0078] (2) Oxygen top-bottom double-blown converter: adopt sub-lance technology and bottom-blown argon technology to control the molten steel [O] at the end of the converter 2 o 3 The total amount of deoxygenated inclusions. The end point of the converter and the tapping operation are important links in nitrogen control in the present invention.
[0079] (3) LF refining: Refining incoming molten steel [Al] 0.020-0.030%, molten steel temperature ≥ 1550°C; adding lime at 6-7Kg / ton, controlling slag composition to be CaO 55-60%; Al 2 o 3 25-30%; SiO 2 7~8%; MgO 5~7%, alkalinity CaO / SiO 2 The value is 7-8; refining produces white slag; the aluminum composition of molten steel is adjusted, and the number of times of aluminum distribution is strictly controlled to be less than 3 times, specifically twice in this embodiment; the mass percentage ...
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