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Continuous casting protection slag for high-alumina steel and manufacture method thereof

A technology for continuous casting mold flux and its manufacturing method, which is applied in the field of continuous casting mold flux for high-alumina steel and its manufacture, which can solve the problems of large amount of flux added, poor glass property, and environmental pollution, and achieve improved composition and good surface quality Effect

Inactive Publication Date: 2008-12-31
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This mold flux is due to SiO 2 Low, poor glass, high melting temperature, large amount of flux added, especially the increased amount of element F will pollute the environment and corrode equipment

Method used

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  • Continuous casting protection slag for high-alumina steel and manufacture method thereof
  • Continuous casting protection slag for high-alumina steel and manufacture method thereof
  • Continuous casting protection slag for high-alumina steel and manufacture method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A continuous casting mold flux for high-alumina steel, the percentage ratio of its chemical composition is: CaO+Al 2 o 3 %: 58% and CaO% / Al 2 o 3 %=0.93, SrO: 12%, BaO: 3%, MgO: 1%, flux: Na 2 O: 10%, Li 2 O: 3%, F: 8%, and keep SiO 2 ≤2%. In the ratio of raw materials, it is necessary to make the inevitable impurity SiO 2 The total amount is less than 2%. Reduce SiO in mold flux 2 content, can greatly reduce SiO in slag 2 The activity of the slag is greatly weakened, and the activity of silica is as image 3 shown.

[0031] The method for making the above-mentioned continuous casting mold flux for high aluminum steel comprises the following steps:

[0032] (1) Prepare raw materials according to the following chemical composition percentage ratio: CaO+Al 2 o 3 %: 58% and CaO% / Al 2 o 3 %=0.93, SrO: 12%, BaO: 3%, MgO: 1%, flux ratio: Na 2 O: 10%, Li 2 O: 3%, F: 8%, and keep SiO 2 ≤2%;

[0033] (2) Melting, melting with a water-cooled furnace wall electr...

Embodiment 2

[0039] A continuous casting mold flux for high-alumina steel, the percentage ratio of its chemical composition is: CaO+Al 2 o 3 %: 55% and CaO% / Al 2 o 3 %=0.72, SrO: 10%, BaO: 2%, MgO: 3%, flux: Na 2 O: 14%, Li 2 O: 2%, F: 7%, and keep SiO 2 ≤2%.

[0040] The method for making the above-mentioned continuous casting mold flux for high aluminum steel comprises the following steps:

[0041] (1) Prepare raw materials according to the following chemical composition percentage ratio: CaO+Al 2 o 3 %: 55% and CaO% / Al 2 o 3 %=0.72, SrO: 10%, BaO: 2%, MgO: 3%; flux ratio: Na 2 O: 14%, Li 2 O: 2%, F: 7%, and keep SiO 2 ≤2%;

[0042] (2) Melting, melting with a water-cooled furnace wall electric furnace without lining;

[0043] (3) Water quenching, the slag directly enters the pool and solidifies into a glass body;

[0044] (4) Drying, drying the moisture to prepare for pulverization;

[0045] (5) pulverizing, the powder particle size after pulverizing is that 80% of the u...

Embodiment 3

[0048] as CaO-Al 2 o 3 It is mold flux. In this example, CaO and Al in mold flux 2 o 3 Is the main component, usually (CaO+Al 2 o 3 )% greater than 50%, from the phase diagram when CaO% / Al 2 o 3 When %=0.7~1.3, it is the vitrification formation zone of calcium aluminate, which is the low melting point zone. And when CaO% / Al 2 o 3 % close to 1 is exactly CaO-Al 2 o 3 The eutectic point, where the melting point is the lowest. Therefore, CaO% / Al 2 o 3 %≈1 is ideal, as figure 1 shown. Experimental studies have confirmed that under the same conditions of external components and external flux, when CaO% / Al 2 o 3 The melting temperature of mold flux is the lowest when % is close to 1, such as figure 2 shown. Therefore, in this example, according to CaO% / Al 2 o 3 %≈1 to make mold powder Raw material: CaO+Al 2 o 3 %: 58% and CaO% / Al 2 o 3 %=1, SrO: 5%, BaO: 5%, MgO: 2%, flux: Na 2 O: 12%, Li 2 O: 3%, F: 9%, and keep SiO 2 ≤2%.

[0049] The method for making...

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Abstract

The invention relates to a steel-making auxiliary material and a production method thereof, in particular to a continuous casting powder for high-aluminum steel and a production method thereof. The invention is mainly technically characterized in that the casting powder raw material is prepared by using the following chemical components with the percentage: CaO+Al2O3 accounts for 50%-60%, and the ratio of CaO to Al2O3 is 0.7-1.3, SrO accounts for 4-10%, BaO accounts for 2-5%, MgO accounts for 1-3%, fluxing agent is composed of Na2O which accounts for 10-16%, Li2O accounting for 2-5%, F accounting for 6-12%, and SiO2 which is kept less than or equal to 2%. The casting powder is produced by the steps of melting, water quenching, drying and crushing and by adding a carbon material. The continuous casting powder can inhibit the oxidized strong reducing elements from entering the slag to cause the slag denaturation; and can ensure smooth continuous casting production of steel products containing high aluminum, Ti and rare earths, and good surface quality of casting blank.

Description

technical field [0001] The invention relates to a steelmaking auxiliary material and a manufacturing method thereof, in particular to a continuous casting mold slag for high-alumina steel and a manufacturing method thereof. Background technique [0002] During continuous casting of molten steel, mold slag is continuously added to the surface of molten steel in the continuous casting mold, and the molten mold slag flows into the gap between the billet and the mold with the vibration of the mold to lubricate and control heat transfer. Function; slag isolates air to avoid oxidation of molten steel; unmelted solid slag has heat preservation effect on molten steel; slag also absorbs inclusions such as alumina in molten steel. The main chemical components of mold flux are CaO, SiO 2 and Al 2 o 3 etc., then add basic carbonate and fluoride to adjust the melting point and viscosity, and add carbon materials to adjust the melting speed. SiO as one of the main components 2 The co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/111
Inventor 朱祖民张晨蔡得祥庄铁
Owner BAOSHAN IRON & STEEL CO LTD
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