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A technology of mold flux and silica glass, which is applied in the field of slab continuous casting mold flux for high-alumina steel (Al>2% steel), which can solve the problems of not being able to achieve the effect of melting slag and unable to carry out applications, etc.
Inactive Publication Date: 2012-04-11
BAOSHAN IRON & STEEL CO LTD
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But SiO 2 It is the most basic composition of mold slag and an important component of slag vitrification, so the above-mentioned silicon-free mold slag cannot achieve the effect of vitrified slag, so it cannot be applied to most steel types
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Embodiment 1
[0036] A kind of silicon-free glass mold powder, its chemical composition mass percentage is: CaO: 32%, Al 2 O 3 :29.5%, Na 2 O: 8%, Li 2 O: 4%, F: 5%, MgO: 2%, BaO: 6%, SrO: 6%, C: 4.5%, the rest are trace impurities brought by raw materials, CaO / Al 2 O 3 =1.08, the melting point of the mold powder is 1085°C, the viscosity at 1300°C is 0.30 Pa.s, and the glass transition rate is 95%.
Embodiment 2
[0038] A kind of silicon-free glass mold powder, its chemical composition mass percentage is: CaO: 33%, Al 2 O 3 : 25%, Na 2 O: 10%, Li 2 O: 2%, F: 8%, MgO: 1.5%, BaO: 8%, SrO: 5%, C: 3%, the rest are trace impurities brought in by raw materials, CaO / Al 2 O 3 =1.32, the melting point of the mold powder is 1130°C, the viscosity at 1300°C is 0.33 Pa.s, and the glass transition rate is 85%.
Embodiment 3
[0040] A kind of silicon-free glass mold powder, its chemical composition mass percentage is: CaO: 34%, Al 2 O 3 : 36%, Na 2 O: 4%, Li 2 O: 3.5%, F: 3%, MgO: 4%, BaO: 5%, SrO: 7%, C: 1.2%, the rest are trace impurities brought in by raw materials, CaO / Al 2 O 3 =0.94, the melting point of the mold powder is 1140℃, the viscosity at 1300℃ is 0.40Pa.s, and the glass transition rate is 90%.
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Abstract
The invention relates to an auxiliary material for continuous casting during steelmaking, in particular to plate blank continuous casting covering slag for high aluminum steel (steel containing 2% of Al, i.e., silica-free glassy state covering slag which comprises the components in percentage by mass: 4-10% of Na2O, 3-8% of F, 2-5% of Li2O, 1-4% of MgO, 5-8% of SrO, 5-8% of BaO, 1-5% of C, impurities with the total mass not being more than 5% and the balance CaO and Al2O3, wherein CaO / Al2O3=0.82-1.33, and the sum of all the components is 100%. The melting point of the covering slag is 1000-1200 DEG C, the viscosity of the covering slag at the temperature of 1300 DEG C is 0.1-0.5Pa.s and the vitrification rate of the covering slag is not lower than 70%. By using the covering slag provided by the invention, the extent of reaction of slag steel can be greatly reduced, and the glassy state covering slag ensures the lubricating effect of a casting blank.
Description
Technical field [0001] The invention relates to an auxiliary material for steelmaking and continuous casting, in particular to high-aluminum steel (Al> 2% of steel grades) use slab continuous casting mold powder. Background technique [0002] Continuous casting mold powder is a kind of steelmaking auxiliary functional material covering the surface of molten steel in the mold of continuous casting machine. Its shape is black powder or small particles. It has a variety of functions such as heat insulation, prevention of molten steel oxidation, absorption of inclusions, lubrication and heat transfer control. It is the last process element for controlling the surface quality of cast slabs in the steelmaking process. In order to ensure these five functions of the mold powder, when the mold powder covers the surface of molten steel, a certain thickness of liquid slag layer must be formed between the molten steel and the solid mold powder to effectively prevent the entry of air a...
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