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Novel casting powder and application thereof

A technology for mold slag and continuous casting mold slag, which is applied in the field of new mold slag, can solve the problems of deterioration of mold slag performance and lack of consideration, and achieve the effects of reducing defects such as longitudinal cracks and inclusions, increasing consumption, and reducing melting point and viscosity.

Inactive Publication Date: 2015-01-28
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these mold fluxes do not take into account the high melting point Cr formed by the oxidation of Cr in high-carbon chromium-containing steel. 2 o 3 , the impact on the deterioration of the mold flux performance, and the resulting problems such as a large number of longitudinal cracks and inclusions in the cast slab, so these mold fluxes are not suitable for the production of high-carbon chromium-containing steel by slab continuous casting machines, especially not suitable for use Produce high-carbon chromium-containing steel slab products with a mass percentage of C of 1.3-1.8% and a mass percentage of Cr of 10-15% in the slab continuous casting machine

Method used

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  • Novel casting powder and application thereof
  • Novel casting powder and application thereof
  • Novel casting powder and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035] A kind of mold flux, its composition mass percentage is: CaO: 30.2%, SiO 2 : 31.7%, Al 2 o3 : 3.6%, MgO: 2.0%, (Na 2 O+Li 2 O): 15.9% (Na 2 O / Li 2 O=4.3:1 mass ratio), B 2 o 3 : 3.1%, F - : 13.5%. The basicity of the mold flux CaO / SiO 2 is 0.95. The main physical properties of the mold flux measured by the above method are shown in Table 1. According to the design of this embodiment, the chromium-containing steel with mold flux Cr content of 10% and C content of 1.3% is continuously cast; the probability of longitudinal cracks and inclusions in the obtained slab is lower than 0.25%.

Embodiment 2

[0037] A high-carbon chromium-containing steel continuous casting mold powder, its composition mass percentage is: CaO: 31.7%, SiO 2 : 30.2%, Al 2 o 3 : 3.6%, MgO: 2.0%, (Na 2 O+Li 2 O): 15.9% (Na 2 O / Li 2 O=6.9:1 mass ratio), B 2 o 3 : 3.1%, F - : 13.5%. The basicity of the mold flux CaO / SiO 2 is 1.05. The main physical properties of the mold flux measured by the above method are shown in Table 1. According to the design of this embodiment, the chromium-containing steel with mold flux Cr content of 11% and C mass percentage content of 1.4% is continuously cast; the probability of longitudinal cracks and inclusions in the obtained slab is lower than 0.23%.

Embodiment 3

[0039] A high-carbon chromium-containing steel continuous casting mold powder, its composition mass percentage is: CaO: 33.0%, SiO 2 : 28.7%, Al 2 o 3 : 3.6%, MgO: 2.0%, (Na 2 O+Li 2 O): 15.9% (Na 2 O / Li 2 O=6.9:1 mass ratio), B 2 o 3 : 3.2%, F - : 13.6%. The basicity of the mold flux CaO / SiO 2 is 1.15. The main physical properties of the mold flux measured by the above method are shown in Table 1. According to the design of this embodiment, the chromium-containing steel with mold flux Cr content of 12% and C mass percentage content of 1.5% is continuously cast; the probability of longitudinal cracks and inclusions in the cast slab obtained is lower than 0.12%.

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Abstract

The invention relates to novel casting powder and application thereof, and belongs to the technical field of steel continuous casting powder. The casting powder comprises the following components according to mass percentage, 30-33% of CaO, 28-34% of SiO2, 2-5% of Al2O3, 1-3% of MgO, 12-16% of (Na2O+Li2O), 1-6% of B2O3, and 11-14% of F-. The casting powder has the characteristics of low melting point (950 to 1,050 DEG C), low viscosity (the viscosity is 0.06 to 0.10Pa.s at the temperature of 1,300 DEG C), high crystallization temperature (1,215 to 1,302 DEG C) and the like. The casting power designed by the invention is suitable for the continuous casting of high-carbon chromium-containing steel of which the mass percentage of C is 1.3-1.8% and the mass percentage of Cr is 10-15%. When the casting powder is applied to the continuous casting production of a high-carbon chromium-containing steel slab, Cr2O3 and other impurities with a high melting point in a crystallizer can be effectively absorbed, the infiltration capability of the casting powder is improved, and the slow cooling of a meniscus is implemented, so that the objectives of increasing the lubricating of a casting blank, controlling the heat transferring at the meniscus, reducing the cracking and inclusion of the casting blank and improving the quality of the casting blank are achieved.

Description

technical field [0001] The invention relates to a novel mold flux and its application, and belongs to the technical field of iron and steel continuous casting mold flux. Background technique [0002] As an important functional material in the continuous casting process, mold slag plays an important role in thermal insulation, preventing secondary oxidation of molten steel, absorbing non-metallic inclusions, lubricating the billet shell and controlling heat transfer in the continuous casting mold. The performance of the mold flux directly determines the quality of the slab, thereby affecting the production efficiency. [0003] High-carbon chromium-containing steel is firstly used as high-carbon steel. From the Fe-C binary phase diagram, it can be seen that with the increase of carbon content in steel, the temperature difference between liquidus and solidus line of steel becomes larger. Therefore, high-carbon steel has a wider In the pasty temperature range, it is easier to c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/111
CPCB22D11/111
Inventor 王万林周乐君徐超
Owner CENT SOUTH UNIV
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