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Ultrahigh casting speed thin slab continuous casting powder for medium carbon low alloy steel

A thin slab continuous casting, low alloy steel technology, applied in the field of iron and steel metallurgy, can solve the problems of longitudinal cracks on the surface of the billet shell, weak temperature control ability, etc.

Pending Publication Date: 2020-09-01
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At this time, if the mold slag does not flow in evenly and the temperature control ability is weak, the shell will easily cause surface longitudinal cracks

Method used

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  • Ultrahigh casting speed thin slab continuous casting powder for medium carbon low alloy steel
  • Ultrahigh casting speed thin slab continuous casting powder for medium carbon low alloy steel
  • Ultrahigh casting speed thin slab continuous casting powder for medium carbon low alloy steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The preparation method of the mold powder according to the embodiment of the present invention is as follows: the raw materials containing the above-mentioned components are mixed in proportion and then ground into a powder with a mesh size of less than 200 meshes and mixed into the carbonaceous material with the designed content so that the performance and composition meet the design requirements. After being melted at high temperature, pulverized and slagging, the ultra-high-speed thin slab continuous casting mold powder for medium-carbon low-alloy steel in the first row of Table 1 can be obtained.

[0040] Specifically, the ultra-high drawing speed thin slab continuous casting mold powder for medium carbon low alloy steel includes the following components: CaO: 31.0%, SiO 2 : 19.0%, Al 2 O 3 : 5.0%, MgO: 4.0%, Na 2 O: 5.0%, K 2 O: 0.3%, CaF 2 : 8.0%, Fe 2 O 3 : 0.5%, Li 2 O: 1.0%, C: 8.0%, the balance is unavoidable impurities.

[0041] The dual basicity (CaO / SiO2 mass per...

Embodiment 2

[0052] The preparation method of the mold powder according to Example 2 of the present invention is the same as that of Example 1, so the detailed description thereof is omitted.

[0053] Specifically, the ultra-high drawing speed thin slab continuous casting mold powder for medium carbon low alloy steel includes the following components: CaO: 33.0%, SiO 2 : 22.0%, Al 2 O 3 : 7.0%, MgO: 7.0%, Na 2 O: 8.0%, K 2 O: 1.0%, CaF 2 : 10.0%, Fe 2 O 3 :1.0%, Li 2 O: 2.0%, C: 10.0%, the balance is unavoidable impurities.

[0054] The dual basicity (CaO / SiO2 mass percentage) of this medium-carbon low-alloy steel ultra-high-speed thin slab continuous casting mold flux is 1.50, and the physical indicators are as follows: melting point 1110°C, viscosity (1300°C): 0.030Pa·s .

[0055] The mold slag prepared by using the above-mentioned ingredients and indicators uses 6 furnaces of steel on the S320X steel grade, with a cross-section of 1548×72mm, and a drawing speed of about 5.0m / min. The use of th...

Embodiment 3

[0058] The preparation method of the mold powder according to Example 3 of the present invention is the same as that of Example 1, so the detailed description is omitted.

[0059] Specifically, the ultra-high drawing speed thin slab continuous casting mold powder for medium carbon low alloy steel includes the following components: CaO: 31.8%, SiO 2 : 20.1%, Al 2 O 3 : 5.8%, MgO: 5.3%, Na 2 O: 6.1%, K 2 O: 0.1%, CaF 2 : 9.4%, Fe 2 O 3 : 0.4%, Li 2 O: 1.1%, C: 9.1%, the balance is unavoidable impurities.

[0060] The dual basicity (CaO / SiO2 mass percentage) of this medium-carbon low-alloy steel ultra-high-speed thin slab continuous casting mold flux is 1.58, and the physical indicators are as follows: melting point 1100°C, viscosity (1300°C): 0.020Pa·s .

[0061] The mold flux prepared by using the above-mentioned ingredients and indicators uses 8 furnaces of steel on the S350X steel grade, with a cross-section of 1547×72mm, and a drawing speed of about 5.0m / min. The use of the mold on...

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Abstract

The invention discloses ultrahigh casting speed thin slab continuous casting powder suitable for casting medium carbon low alloy steel. The casting powder is prepared from the following chemical components in percentage by weight: 31 to 33 percent of CaO, 19 to 22 percent of SiO2, 5 to 7 percent of Al2O3, 4 to 7 percent of MgO, 5 to 8 percent of Na2O, 0 to 1 percent of K2O, 8 to 10 percent of CaF2, 0 to 1 percent of Fe2O3, 1 to 2 percent of LiO2, 8 to 10 percent of C, and the balance of inevitable impurities. The ultrahigh casting speed thin slab continuous casting powder has the alkalinity (the ratio of CaO to SiO2) of 1.5 to 1.7, melting point of 1090 to 1110 DEG C and the viscosity at 1300 DEG C of 0.01 to 0.03 Pa.s. According to the ultrahigh casting speed thin slab continuous castingpowder disclosed by the invention, by adjusting the components of the ultrahigh casting speed thin slab continuous casting powder for the casting medium carbon low alloy steel, in particular to the contents of CaO, SiO2, LiO2 and elemental carbon, appropriately improving the alkalinity, reducing the viscosity, the melting point and the transition temperature of the casting powder, and improving the melting rate, the occurrence rates of cracks and included slag in the casting process are reduced, and stable and smooth production of medium carbon low alloy steel thin slabs at high casting speedand the improvement to the quality of casting blanks are ensured.

Description

Technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to metallurgical auxiliary materials for continuous casting, and more specifically to a continuous casting mold flux suitable for ultra-high drawing speed thin slabs used in a medium-carbon low-alloy steel continuous casting process. Background technique [0002] Continuous casting mold flux is a kind of silicate-based functional material containing multiple fluxes and framework materials. With the continuous improvement of the continuous casting speed and the use of electromagnetic braking equipment, the environment and the metallurgical behavior of the mold powder in the mold have changed greatly, especially the melting uniformity and lubrication performance are difficult to guarantee. In addition, due to the complex structure of the funnel-shaped mold, the crack sensitivity of the continuous casting billet has become more prominent. This requires optimization of the ...

Claims

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Application Information

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IPC IPC(8): B22D11/111
CPCB22D11/111
Inventor 朱立光肖鹏程王杏娟刘增勋袁志鹏王硕明高永春张洪波单庆林赵建平郑英辉张杰李可斌
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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