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Crystallizer protecting cinder for continuous casting of crack sensitive steel and its prepn process

A technology of mold powder and crack sensitivity, which is applied in the fields of mold powder for continuous casting of molten steel, mold powder for continuous casting of crack-sensitive steel and its preparation, and can solve the problem of continuous casting machine productivity and capacity reduction , leakage, deterioration and other problems, to achieve the effect of reducing the occurrence probability of longitudinal cracks, reducing the heat transfer of infrared radiation, increasing the crystallization rate and crystallization temperature

Inactive Publication Date: 2007-06-06
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the alkalinity of the mold slag is too high and the crystallization temperature is too high, it is easy to seriously deteriorate the lubrication condition of the slab, resulting in slab sticking and breakout. The continuous casting production is forced to adopt the technical route of reducing the casting speed, which makes the continuous casting Casting machine productivity and production capacity are reduced by 20% to 30%. Therefore, research on the heat transfer characteristics of mold slag, especially how to coordinate the mold slag film to lubricate the billet and control heat transfer, is related to improving the quality of the billet and improving the production efficiency of continuous casting. The key has become a hot issue in the research of continuous casting workers in the world today

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033]First, check whether the composition of raw materials meets the following conditions, and measure the chemical composition of raw materials such as wollastonite, limestone, fluorite, quartz sand, manganese carbonate, soda and carbonaceous materials. Select the raw material that meets the following conditions, namely wollastonite: SiO 2 43-53%, CaO40-49%, 02 2 >95%; fluorite: CaF 2 85-90%, 02 3 >96%; Soda: Na 2 CO 3 >95%; carbonaceous material: C>95%; otherwise, it should not be used.

[0034] Then, it is not difficult to calculate the weight of the required raw materials according to the chemical composition of mold flux as shown in Table 1, see Table 2;

[0035] The mold slag of the present invention is refined by the following process: Melt the wollastonite, limestone, fluorite, quartz sand, manganese carbonate and soda weighed in proportion in a submerged arc furnace, and cool naturally after being released from the furnace; crushing To 200 orders; After adding th...

Embodiment 2

[0042] The method is the same as in Example 1. The raw materials of mold flux are also wollastonite, limestone, fluorite, quartz sand, manganese carbonate, soda and carbonaceous materials. The chemical composition and physical properties of mold flux are shown in Table 4. The premelted raw materials The weight ratio is shown in Table 5, and the added carbonaceous materials are: 2% carbon black, 6.4% high-carbon graphite, and the corresponding steel composition is shown in Table 6.

[0043]

[0044] Ingredients

[0045] steel type

[0046] The experimental conditions are: slab continuous casting, slab section: 200×1250mm, 240×1400mm, casting speed: 0.7-1.30m / min, pouring temperature: 1525-1545°C. The crystallization rate of the mold slag is about 50%. Compared with the original mold slag, the longitudinal cracks of the billet are significantly reduced, and the surface cleaning rate caused by the longitudinal cracks is reduced by 50%. The slag can be...

Embodiment 3

[0048] The method is the same as in Example 1, and the raw materials of the mold flux are also wollastonite, limestone, fluorite, quartz sand, manganese carbonate, soda and carbonaceous materials. The chemical composition and physical properties of the mold flux are shown in Table 7, and the weight ratio of raw materials is See Table 8, the added carbonaceous materials are: 2% carbon black, 5.3% high-carbon graphite, and the composition of the corresponding steel is shown in Table 9.

[0049]

CaO

SiO 2

CaO / SiO 2

Al 2 o 3

F -

Fe 2 o 3

MnO

Na 2 o

C

Viscosity, Pa.S

melting temperature

degree, ℃

38.5

38.3

1.00

2.3

3.45

1.0

4.35

4.40

7.3

0.304

1164

[0050] Ingredients

wollastonite

limestone

Yingshi

Quartz sand

manganese carbonate ...

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Abstract

The present invention provides one kind of crystallizer protecting cinder for continuous casting of crack sensitive steel and its preparation process. The protecting cinder is compounded with wollastonite, limestone, quartz sand, fluorite, industrial soda, manganese carbonate and carbon material. Chemically, it consists of CaO 28-42 wt%, SiO2 26-40 wt%, CaF2 10-20 wt%, Na2O 4-10 wt%, MnO2 2-8 wt%, Al2O3 0-6 wt%, and C 2-10 wt%, and has the weight ratio between CaO and SiO 2in 1.0-1.2. The crystallizer protecting cinder can reduce the heat transfer, maintain the crystallization rate and the crystallization temperature of protecting cinder, reduce longitudinal cracks in the surface of cast billet, and raise continuous casting efficiency and quality.

Description

technical field [0001] The invention relates to mold mold powder for continuous casting of molten steel, in particular to mold mold powder for continuous casting of crack-sensitive steel and a preparation method thereof, belonging to the technical field of steelmaking and continuous casting. technical background [0002] Continuous steel casting is the main method and way of solidification and forming of molten steel. In the continuous casting process, it is the basic requirement of the continuous casting process to ensure the surface and internal quality of the continuous casting slab, maintain the production rhythm, and ensure the smooth flow of the process. The use of mold powder in the mold during continuous casting is an essential means to control the surface quality of the slab and ensure the smooth running of continuous casting. [0003] Among the functions of mold slag in continuous casting molds, such as thermal insulation, prevention of secondary oxidation of molt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/111C21C7/076
CPCY02P10/20
Inventor 谢兵王雨王谦何生平李刚李玉刚王水波刁江王南辉
Owner CHONGQING UNIV
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