Novel corrosion-resistant alloy steel continuous casting powder and application thereof

A technology for mold slag and alloy steel, which is applied in the field of continuous casting of iron and steel, can solve the problems of deterioration of mold slag performance, neglect of redox reaction, inclusion of cast slabs, etc. The effect of viscosity

Inactive Publication Date: 2015-03-11
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these mold fluxes have not considered the redox reaction between the active elements in the alloy and some oxides in the mold flux, such as 4[Al]+3(SiO 2 )=2(Al 2 o 3 )+3[Si], [Ti]+(SiO2)=(TiO 2 )+[Si], the effect on the performance deterioration of mold flux
And the resulting slab produces a large number of longitudinal cracks and inclusions, so these mold fluxes are not suitable for the production of alloys containing active elements in slab continuous casting machines, especially not suitable for the production of Al quality in slab continuous casting machines Corrosion-resistant alloy products with a percentage content of 0-0.3% and a mass percentage content of Ti in the range of 0.8-1.1%

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A new type of corrosion-resistant alloy steel continuous casting mold powder, its composition mass percentage is: CaO 18.2%, SiO 2 25.0%, Al 2 o 3 13.5%, MgO 2.6%, (Na 2 O+Li 2 O) 13.2% (Na 2 O / Li 2 O=11.2:1 mass ratio), B 2 o 3 6.2%, TiO 2 4.3%, BaO6.0%, F - 11.0%. The basicity of the mold flux CaO / SiO 2 is 0.73. The main physical properties of the mold flux measured by the above method are shown in Table 1. The mold slag designed in this embodiment is used in the continuous casting process of corrosion-resistant alloy steel with a mass percentage of Al of 0.2% and a mass percentage of Ti of 1.0%; the resulting slab has a low probability of longitudinal cracking and inclusion at 0.55%.

Embodiment 2

[0038] A new type of corrosion-resistant alloy steel continuous casting mold powder, its composition mass percentage is: CaO 18.2%, SiO 2 26.0%, Al 2 o 3 12.8%, MgO 2.8%, (Na 2 O+Li 2 O) 13.4% (Na 2 O / Li 2 O=11.4:1 mass ratio), B 2 o 3 5.7%, TiO 2 3.9%, BaO5.9%, F - 11.3%. The basicity of the mold flux CaO / SiO 2 is 0.70. The main physical properties of the mold flux measured by the above method are shown in Table 1. The mold slag designed in this embodiment is used in the continuous casting process of corrosion-resistant alloy steel with a mass percentage of Al of 0.3% and a mass percentage of Ti of 1.0%; at 0.09%.

Embodiment 3

[0040] A new type of corrosion-resistant alloy steel continuous casting mold powder, its composition mass percentage is: CaO 21.9%, SiO 2 24.1%, Al 2 o 3 12.8%, MgO 2.6%, (Na 2 O+Li 2 O) 13.2% (Na 2 O / Li 2 O=10.5:1 mass ratio), B 2 o 3 5.5%, TiO 2 3.4%, BaO5.5%, F - 11.0%. The basicity of the mold flux CaO / SiO 2 is 0.90. The main physical properties of the mold flux measured by the above method are shown in Table 1. The mold flux designed in this embodiment is used in the continuous casting process of corrosion-resistant alloy steel with a mass percentage of Al of 0.2% and a mass percentage of Ti of 1.1%; at 0.38%.

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Abstract

The invention relates to novel corrosion-resistant alloy steel continuous casting powder and application thereof, and belongs to the technical field of continuous casting of iron and steel. The casting powder comprises the following components in mass percentage: 17 to 25% of CaO, 23 to 31% of SiO2, 10 to 15% of Al2O3, 1 to 4% of MgO, 10 to 14% of (Na2O+Li2O), 1 to 8% of B2O3, 1 to 6% of TiO, 4 to 8% of BaO, and 10 to 13% of F<->. The casting powder has the characteristics that the melting point is small (865-988 DEG C), the viscosity is small (0.11-0.23Pa.s under 1,300 DEG C), the crystallizing rate is moderate (40-70%), etc. The casting powder can be applied well to the continuous casting of corrosion-resistant alloy steel (Fe-Cr-Ni system) containing 0 to 0.3% of Al and 0.8 to 1.1% of Ti in mass percentage.

Description

technical field [0001] The invention relates to a novel corrosion-resistant alloy steel mold slag and its application, belonging to the technical field of iron and steel continuous casting. 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] Alloying elements added to steel not only greatly improve the quality of steel, but also have adverse effects on its production process. Especially for steel types containing active metals such as Al, Ti, Mn, Cr, Mo, V, etc., these alloy elements will be partially oxidized in the slag / steel interface and the mold slag during the con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/111
CPCB22D11/111
Inventor 王万林周乐君赵欢张海辉谢森林江斌斌
Owner CENT SOUTH UNIV
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