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Non-Newtonian fluid continuous casting covering slag for low-carbon steel and preparation method thereof

A technology of non-Newtonian fluid and continuous casting mold slag, which is applied in the field of iron and steel metallurgy to achieve the effects of reducing bonded breakouts, improving the qualified rate of steel rolling, and increasing the casting speed of continuous casting

Pending Publication Date: 2022-07-29
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, there is a lack of research on non-Newtonian fluid mold flux for low-carbon steel, in order to reduce the harm of slag entrainment and sticky slag to the quality of casting slabs and the occurrence of bonded breakouts

Method used

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  • Non-Newtonian fluid continuous casting covering slag for low-carbon steel and preparation method thereof
  • Non-Newtonian fluid continuous casting covering slag for low-carbon steel and preparation method thereof
  • Non-Newtonian fluid continuous casting covering slag for low-carbon steel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A non-Newtonian fluid continuous casting mold flux for low carbon steel, in terms of mass percentage, comprising the following components: CaO: 33.12%, SiO 2 : 33.07%, Al 2 O 3 : 3.62%, MgO: 3.07%, Na 2 O: 10.06%, CaF 2 : 7.92%, B 2 O 3 : 5.86%.

[0038] The binary basicity (CaO / SiO 2 mass percent) was 1.00, and the physical indicators were as follows: melting point 1112°C, viscosity (1300°C): 0.181 Pa·s.

[0039] The mold slag prepared with the above-mentioned components and indicators is used on SPHC steel grades with 4 heats of steel, with a cross-section of 1200×170 mm and a pulling speed of about 1.6 m / min. The quality is observed, and the rolling conditions are tracked. The results are as follows:

[0040] The situation in the mold: The mold slag melts evenly in the mold, and the reaction is relatively active. There is no large slag bar in use. The thickness of the liquid slag layer is 6-9mm, and the slag consumption is 0.36kg / t, and it has been relatively...

Embodiment 2

[0042] A non-Newtonian fluid continuous casting mold flux for low carbon steel, in terms of mass percentage, comprising the following components: CaO: 29.24%, SiO 2 : 32.49%, Al 2 O 3 : 3.55%, MgO: 3.01%, Na 2 O: 9.90%, CaF 2 : 7.78%, B 2 O 3 : 7.52%.

[0043] The binary basicity (CaO / SiO 2 mass percent) was 0.90, and the physical indexes were as follows: melting point 1096°C, viscosity (1300°C): 0.191 Pa·s.

[0044] The mold slag prepared with the above components and indicators is used on SPHC steel grades with 5 heats of steel, the cross section is 1200×170mm, and the pulling speed is about 1.6m / min. The quality is observed, and the rolling conditions are tracked. The results are as follows:

[0045] The situation in the mold: the mold slag melts evenly in the mold, the reaction is relatively active, no large slag bars appear during use, the thickness of the liquid slag layer is 6-9mm, the slag consumption is 0.35kg / t, and it has been relatively stable. The heat fl...

Embodiment 3

[0047] A non-Newtonian fluid continuous casting mold flux for low carbon steel, in terms of mass percentage, comprising the following components: CaO: 34.91%, SiO 2 : 31.72%, Al 2 O 3 : 3.47%, MgO: 2.94%, Na 2 O: 9.66%, CaF 2 : 7.59%, B 2 O 3 : 9.71%.

[0048] The binary basicity (CaO / SiO 2 mass percent) was 1.10, and the physical indexes were as follows: melting point 1081°C, viscosity (1300°C): 0.200 Pa·s.

[0049] The mold slag prepared with the above components and indicators is used on SPHC steel grades with 6 heats of steel, with a section of 1200 × 170 mm and a pulling speed of about 1.6 m / min. The quality is observed, and the rolling conditions are tracked. The results are as follows:

[0050] The situation in the mold: The mold slag melts evenly in the mold, and the reaction is relatively active. There is no large slag bar in use. The thickness of the liquid slag layer is 8-12mm, and the slag consumption is 0.37kg / t, and it has been relatively stable. The hea...

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Abstract

The invention discloses non-Newtonian fluid continuous casting covering slag for low-carbon steel and a preparation method of the non-Newtonian fluid continuous casting covering slag, and the non-Newtonian fluid continuous casting covering slag for the low-carbon steel comprises the following chemical components in percentage by mass: 28-36% of CaO, 27-34% of SiO2, 3-6% of Al2O3, 2-4% of MgO, 8-11% of Na2O, 6-9% of CaF2, 5-14% of B2O3 and the balance of carbon and inevitable impurities. According to the non-Newtonian fluid casting powder, different contents of B2O3 are added into other raw materials of the casting powder, so that the casting powder has the non-Newtonian fluid characteristics, the viscosity of the non-Newtonian fluid casting powder can be reduced along with the increase of the shearing rate, namely, the viscosity in a retention area (the surface of a molten steel surface) of a crystallizer is relatively high, the fluctuation of the molten steel surface is reduced, and the slag entrapment phenomenon is prevented; and the viscosity in a lubricating area (or below a meniscus) of the crystallizer is relatively low, so that the heat transfer and lubricating capacities of the casting powder are improved, and the frequency of bonding breakout caused by poor lubrication is reduced.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a non-Newtonian fluid continuous casting mold flux for low carbon steel and a preparation method thereof. Background technique [0002] Continuous casting mold flux is a functional material with silicate as the matrix containing various fluxes and framework materials. With the continuous improvement of the continuous casting speed, the continuous expansion of the cast billet varieties, and the continuous increase in the quality requirements of the cast billet, the various physical and chemical properties of the mold flux, especially some new characteristics, have an impact on the continuous casting process and the quality of the cast billet. The influence of continuous casting technology is becoming increasingly important, and it has become one of the limiting factors for the development of continuous casting technology in the future, and it is also one of the i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/111
CPCB22D11/111
Inventor 张凯璇袁志鹏
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY