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Casting powder for continuous casting crystallizer and preparation method of casting powder

A technology for continuous casting mold and mold slag, which is applied in the field of continuous casting mold mold slag and its preparation, which can solve the problems of difficult control of heat transfer process, influence on billet quality, low carbon black ratio, etc., and reduce excessive cooling speed , reduce heat transfer efficiency, and stabilize chemical properties

Active Publication Date: 2022-01-21
TIANJIN RONGCHENG UNITED IRON & STEEL GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, because the heat insulation effect of mold slag is not good enough, the cooling from the outer wall of the mold to the slab is too fast, resulting in longitudinal cracks in the slab, which affects the quality of the slab. It is very common that the mold slag can be effectively controlled by adding carbon black. However, due to the changeable composition of molten steel, it is not easy to calculate the proportion of carbon black added. If the proportion of carbon black is too high, carbon black will easily enter the slab, which will increase the carbon content on the surface of the slab and affect the quality of the slab. The proportion of carbon black Too low, the heat transfer process is difficult to control

Method used

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  • Casting powder for continuous casting crystallizer and preparation method of casting powder
  • Casting powder for continuous casting crystallizer and preparation method of casting powder
  • Casting powder for continuous casting crystallizer and preparation method of casting powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A continuous casting mold powder, including the following components SiO 2 24.00kg, CaO26.00kg, Al 2 o 3 5.40kg, Fe 2 o 3 3.00kg, MgO3.00kg, Na 2 O and Li 2 06.5kg, CaF 2 3.50-7.50 parts, ZrO 2 4.5-5.5 parts, Y 2 o 3 3.5-4.5 parts, of which Na 2 O and Li 2 0 has a weight ratio of 1:1.

[0029] A preparation method of continuous casting mold powder: 24.00kgSiO 2 , 26.00kgCaO, 5.40kgAl 2 o 3 、3.00kgFe 2 o 3 , 3.00kgMgO, 3.50kgCaF 2 , 4.5kgZrO 2 、3.5kgY 2 o 3 , 6.50kgNa 2 O and Li 2 0, mix evenly, use a ball mill to grind, and dry to obtain the finished mold slag powder slag, the particle size of the finished mold slag powder slag corresponds to the mesh number of 100 mesh, wherein Na 2 O and Li 2 The weight ratio of 0 is 1:1, CaO and SiO 2 The weight ratio is 1.08:1.

Embodiment 2-9 and comparative example 1-2

[0031] The difference between Examples 2-9 and Comparative Examples 1-2 and Example 1 is that the ratio of raw materials is different, and the specific ratio of raw materials is shown in Table 1-1 and Table 1-2.

[0032] Table 1-1 embodiment 2-9 and the raw material proportioning of comparative example 1-2

[0033]

[0034]

[0035] Set the mass of each example in Table 1-1 as 1kg, and the rest of the data will be changed accordingly as shown in the following table:

[0036] Table 1-2 embodiment 2-9 and the raw material ratio of comparative example 1-2

[0037]

[0038] performance test

[0039] Viscosity test: According to the standard YB / T185-2017 continuous casting mold flux viscosity test method, the mold flux viscosity test is tested.

[0040]Heat transfer efficiency test method: use HF-200 crystallizer slag film heat flow simulator to test the heat flux density of mold flux.

[0041] Preparation steps of heat flow tester slag film: at 1300°C, mix 350g of the ...

Embodiment 10-14 and comparative example 3-4

[0056] The difference between Examples 10-14 and Comparative Examples 3-4 and Example 1 is that the raw material ratio is different, and the specific raw material ratio is shown in Table 3-1 and Table 3-2.

[0057] Table 3-1 embodiment 10-14 and the raw material proportioning of comparative example 3-4

[0058]

[0059]

[0060] Set the mass of each example in Table 3-1 as 1kg, and the rest of the data changes accordingly as shown in the following table:

[0061] Table 3-2 embodiment 10-14 and the raw material proportioning of comparative example 3-4

[0062] Example 10 Example 11 Example 12 Example 13 Example 14 Comparative example 3 Comparative example 4 SiO 2 / kg

0.30 0.29 0.30 0.33 0.29 0.32 0.29 CaO / kg 0.32 0.31 0.33 0.31 0.33 0.34 0.32 Al 2 o 3 / kg

0.07 0.06 0.07 0.07 0.07 0.07 0.07 Fe 2 o 3 / kg

0.04 0.04 0.04 0.04 0.04 0.04 0.04 MgO / kg 0.04 0.04 0.04 0.04 0.04 0.04 0...

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Abstract

The invention relates to the field of cast steel, and particularly discloses casting powder for a continuous casting crystallizer and a preparation method of the casting powder. The casting powder of the continuous casting crystallizer comprises the following components of, in parts by weight, 24.00-31.00 parts of SiO2, 26.00-33.00 parts of CaO, 5.40-5.70 parts of Al2O3, less than or equal to 3.00 parts of Fe2O3, less than or equal to 3.00 parts of MgO, 6.50-10.50 parts of Na2O and Li2O, 3.50-7.50 parts of CaF2, 4.5-5.5 parts of ZrO2 and 3.5-4.5 parts of Y2O3. The preparation method comprises the following steps of uniformly mixing the components, and grinding to obtain the finished product casting powder slag which has the advantage of good heat insulation effect.

Description

technical field [0001] The application relates to the field of steel casting, and more specifically, it relates to a mold flux for continuous casting molds and a preparation method thereof. Background technique [0002] Mold slag is a functional material that affects the quality of the billet and the stability of the continuous casting process. During the molten steel casting process, granular or powdery slag is continuously added to the molten steel surface of the mold. Due to the high temperature of the molten steel, The mold powder forms a three-layer structure, namely liquid slag layer, sintered layer and powder slag layer. The basic functions of mold powder are: (1) to insulate the exposed molten steel; (2) to prevent secondary oxidation of molten steel; (3) to absorb inclusions floating to the surface of molten steel; The gap is filled with liquid liquid film to play the role of lubrication (5) Control the heat transfer from the slab to the mold. Mold slag can effect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/111
CPCB22D11/111Y02P10/20
Inventor 李俊峰刘和家范洪涛牟贝成利强金鑫薛伟温国栋赵长春韩斐
Owner TIANJIN RONGCHENG UNITED IRON & STEEL GRP CO LTD
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