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Continuous-casting crystallizer casting powder for high-aluminum steel

A continuous casting crystallizer and high-aluminum steel technology, which is applied in the field of steelmaking, can solve the problems of easy deterioration of the quality of ordinary mold powder, easy cracks on the surface of the slab, and unsmooth process, so as to reduce corrosion and air pollution, Improve the effect of absorbing inclusions and the effect of uniform and stable slag

Inactive Publication Date: 2018-06-19
XIXIA LONGCHENG METALLURGICAL MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The high-alumina continuous casting mold flux disclosed in this patent can effectively solve the problem that the high-alumina steel continuous casting process has many inclusions and has a high melting point, so that the quality of ordinary mold flux is easily deteriorated during use, resulting in unsmooth process and Quality defects such as cracks and pits are prone to appear on the surface of the slab
However, the patent CaO+Al 2 o 3 %: 40~50%, and CaO% / Al 2 o 3 %=0.6~1.0, the amount of CaO is relatively low, Al 2 o 3 The content is relatively high, which increases the melting point and viscosity of mold slag, and is prone to steel breakout accidents

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A continuous casting mold powder for high-aluminum steel, its chemical composition and mass percentage are: CaO: 31%, SiO 2 : 20%, MgO: 7%, Li 2 O: 3.6%, Al 2 O 3 : 8.2%, Na 2 O: 10%, F: 3.3%, MnO: 8.8%, C: 8%, and the rest are impurities.

[0023] The basicity of the mold flux is CaO / SiO 2 It is 1.55, melting point is 1140℃, viscosity is 0.7Pa·s at 1300℃.

[0024] When the pouring starts, the adjusted mold powder is pushed into the mold. After observation, the steel liquid level fluctuates within 3mm, and the pulling speed stabilizes at 0.5 m / min. At this time, the thickness of the liquid slag layer is measured at about 9.5mm. Thereafter, the liquid slag layer was measured every 20 minutes, and its thickness was 9-10 mm, which reached the ideal design standard. It has been observed that the mold powder has good spreadability during the casting process and can spread evenly on the surface of molten steel. The mold powder has good air permeability, small flames and uniform f...

Embodiment 2

[0026] A continuous casting mold powder for high-aluminum steel. Its chemical composition and mass percentage are: CaO: 32%, SiO 2 : 26%, MgO: 4.1%, Li 2 O: 4.2%, Al 2 O 3 : 7.5%, Na 2 O: 8.3%, F: 4%, MnO: 7.6%, C: 6%, and the rest are impurities.

[0027] The basicity of the mold flux is CaO / SiO 2 It is 1.23, melting point is 1120°C, viscosity is 0.6 Pa.s at 1300°C.

[0028] When the pouring starts, the adjusted mold powder is pushed into the mold. After observation, the steel liquid level fluctuates within 3mm, and the pulling speed stabilizes at 0.35 m / min. At this time, the thickness of the liquid slag layer is about 10 mm. After that, the liquid slag layer was measured every 20 minutes, and its thickness was 9.5 to 10.5 mm, which reached the ideal design standard. It has been observed that the mold powder has good spreadability during the casting process and can spread evenly on the surface of molten steel. The mold powder has good air permeability, small flames and uniform f...

Embodiment 3

[0030] A continuous casting mold powder for high-aluminum steel, its chemical composition and mass percentage are: CaO: 33%, SiO 2 : 25%, MgO: 6%, Li 2 O: 4.5%, Al 2 O 3 : 7%, Na 2 O: 5%, F: 4.5%, MnO: 8%, C: 6.8%, and the rest are impurities.

[0031] The basicity of the mold flux is CaO / SiO 2 It is 1.32, the melting point is 1130°C, and the viscosity is 0.62 Pa·s at 1300°C.

[0032] When the pouring starts, the adjusted mold powder is pushed into the mold. After observation, the steel liquid level fluctuates within 3.5mm, and the pulling speed stabilizes at 0.5 m / min. At this time, the thickness of the liquid slag layer is measured at about 8.5mm. After that, the liquid slag layer was measured every 20 minutes, and its thickness was 8-9mm, which reached the ideal design standard. It has been observed that during the casting process, the mold powder has good spreadability and can spread evenly on the surface of molten steel. The mold powder has good air permeability, small flames...

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Abstract

The invention belongs to the technical field of steelmaking and particularly relates to continuous-casting crystallizer casting powder for high-aluminum steel. The continuous-casting crystallizer casting powder for the high-aluminum steel comprises the chemical ingredients of, in percentage by mass, 31-39% of CaO, 20-28% of SiO2, 3-7% of MgO, 2-4.5% of Li2O, 5-10% of Al2O3, 5-10% of Na2O, 2-5% ofF, 3-10% of MnO, 4-8% of C and the balance impurities. By means of the casting powder, the defect that aluminum oxide in high-aluminum molten steel enters and deteriorates slag is overcome, and the qualified rate of an obtained casting blank is high.

Description

Technical field [0001] The invention belongs to the technical field of steelmaking, and specifically relates to a mold powder for continuous casting of high-aluminum steel. technical background [0002] In the continuous casting of molten steel, mold flux needs to be continuously added to the surface of the molten steel in the continuous casting mold. The molten mold flux flows continuously between the billet and the mold along with the vibration of the mold to provide lubrication and control heat transfer. The slag insulates the air and prevents the molten steel from oxidizing. The unmelted solid slag has a thermal insulation effect on the molten steel, and the molten slag also absorbs inclusions such as alumina in the molten steel. The main chemical components of traditional mold flux are CaO, SiO 2 , A1 2 O 3 Then, alkali carbonate and fluoride are added to adjust the melting point and viscosity, and carbonaceous materials are added to adjust the melting speed. SiO in traditi...

Claims

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Application Information

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IPC IPC(8): B22D11/111
CPCB22D11/111
Inventor 李晓阳徐金岩屈党军马帅彭会志梁冠东袁忠辉
Owner XIXIA LONGCHENG METALLURGICAL MATERIALS CO LTD
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