Continuous casting crystallizer casting powder for ultra-low-carbon steel

A continuous casting crystallizer and ultra-low carbon steel technology, applied in the field of steelmaking auxiliary materials, can solve the problems of increasing the sintering tendency of mold slag, affecting the melting speed, and high price, so as to prevent the carbonization of ultra-low carbon steel and avoid excessive The effect of carbon increase and strong adsorption function of low carbon steel

Active Publication Date: 2014-05-28
XIXIA LONGCHENG METALLURGICAL MATERIALS CO LTD
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AI Technical Summary

Problems solved by technology

The article "Research on Silicon Carbide as Melting Rate Regulator of Mold Flux in Ultra-low Carbon Steel Continuous Casting Mold" published in No. 3 (p112-120) of 1998 in "Journal of Shaoguan University" introduces the use of SiC to replace mold slag. The method of carbon materials, however, because such substitutes are expensive, and increase the sintering tendency of the mold powder during use, the stability of the operation is reduced; therefore, there is no value for large-scale promotion and application
[0006]2. Use a strong reducing agent to make it preferentially react with oxygen, so as to isolate C from contact with oxygen, but due to its high activity, the transport and The cost of storage is too high
[0007] 3. Use a flame retardant to delay the combustion of C; for example, a continuous casting mold flux for ultra-low carbon steel is disclosed in CN 1485168A. Add one or more of boron-based, ATH-like, sodium aluminate and other flame retardants, the amount of which accounts for 0.5-5.0% of the total, to delay the oxidation rate of carbon in the mold flux, so that the mold flux Carbon can more effectively play its role in controlling the melting speed and acting as a skeleton material, thereby reducing the amount of carbon added in the mold flux, achieving the purpose of preventing the carbon increase of the slab, and effectively realizing the production of ultra-low carbon steel; it uses additives Flame retardant is used to slow down carbon oxidation to prevent carbon increase in this link, but the reduction of its carbon content will definitely affect the melting speed, and the consumption of flame retardant may cause carbon increase, so a more Mold flux for continuous casting molds for simple and effective mold flux to prevent carburization of ultra-low carbon steel

Method used

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  • Continuous casting crystallizer casting powder for ultra-low-carbon steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] For the ultra-low carbon steel of Plant A, the raw material formula of mold powder for continuous casting mold of the present invention is: 15.8 parts of glass powder, 48 parts of wollastonite, 11.2 parts of fluorite, 4.8 parts of cement clinker, 2 parts of activated carbon, and sodium carbonate 4.1 parts, 4.5 parts of sodium fluoride, 3 parts of spodumene, 1 part of lithium carbonate, 1.9 parts of binder, 3.7 parts of lightly burned magnesia.

[0030] The test results of its main physical and chemical indicators are as follows: CaO: 31.89%, SiO 2 : 35.24%, MgO: 4.9%, Al 2 o 3 : 3.7%, Na 2 O: 8.5%, F - : 8.6%, C: 3.2%.

[0031] The basicity of the present invention is CaO / SiO 2 It is 0.9, the melting point is 1093°C and the viscosity is 0.39Pa.s at 1300°C.

[0032] When pouring starts, the adjusted mold slag is pushed into the mold. After observation, the fluctuation of the liquid steel level is within 3mm, and the casting speed is stable at 0.6 m / min. At this tim...

Embodiment example 2

[0034] The mold powder used for the ultra-low carbon steel of Plant B has a raw material formula of: 14.8 parts of glass powder, 45.8 parts of wollastonite, 13.1 parts of fluorite, 5.5 parts of cement clinker, 2 parts of activated carbon, 5.3 parts of sodium carbonate, fluoride 4.5 parts of sodium, 3 parts of spodumene, 1 part of lithium carbonate, 1.9 parts of binder, 3.1 parts of lightly burned magnesia.

[0035] The test results of its main physical and chemical indicators are as follows: CaO: 34.9%, SiO 2 : 33.2%, MgO: 3.5%, Al 2 o 3 : 4.2%, Na 2 O: 7.2%, F - : 5.3%, C: 3.3%.

[0036] The alkalinity of the mold flux of the present invention is CaO / SiO 2 It is 1.05, the melting point is 1131°C, and the viscosity is 0.46Pa.s at 1300°C.

[0037]When pouring starts, the adjusted mold slag is pushed into the mold. After observation, the fluctuation of the liquid steel level is within 3mm, and the casting speed is stable at 0.6 m / min. At this time, the thickness of the liq...

Embodiment example 3

[0039] Our company produces mold powder for continuous casting mold for ultra-low carbon steel in plant C. The raw material formula is: 20 parts of glass powder, 52 parts of wollastonite, 12.7 parts of fluorite, 5.5 parts of cement clinker, and 2 parts of activated carbon , 4.8 parts of sodium carbonate, 4.5 parts of sodium fluoride, 3 parts of spodumene, 1 part of lithium carbonate, 1 part of binder, and 5 parts of lightly burned magnesia.

[0040] The test results of its main physical and chemical indicators are as follows: CaO: 34.13%, SiO 2 : 36.7%, MgO: 6.1%, Al 2 o 3 : 2.9%, Na 2 O: 7.8%, F - : 6.6%, C: 3.5%.

[0041] The basicity of the present invention is CaO / SiO 2 It is 0.92, the melting point is 1075°C and the viscosity is 0.33Pa.s at 1300°C.

[0042] When pouring starts, the adjusted mold slag is pushed into the mold. After observation, the fluctuation of the liquid steel level is within 3 mm, and the casting speed is stable at 0.6 m / min. At this time, the th...

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Abstract

The invention discloses a continuous casting crystallizer casting powder for ultra-low-carbon steel. Active carbon is added in the casting powder, so that air can be made to pass through a casting powder layer to enable the carbon to be oxidized rapidly to generate carbon dioxide gas to be discharged; the active carbon itself has a powerful adsorption function and a part of air is stored, so that the oxidation rate is improved, it is guaranteed that the carbon is removed rapidly after the casting powder is melted rapidly and the casting powder does not contain the carbon, and therefore the recarburization phenomenon of the ultra-low-carbon steel is prevented from occurring from the source. After the active carbon is oxidized rapidly, gaps disappear due to consumption of the active carbon, and the casting powder enables steel billet to be sealed and isolated from the air rapidly so as to prevent the steel billet from being oxidized again. The continuous casting crystallizer casting powder for the ultra-low-carbon steel is low in cost, practical, good in effect and worthy of popularization and application.

Description

technical field [0001] The invention belongs to the technical field of steelmaking auxiliary materials, and in particular relates to a mold slag for continuous casting molds for ultra-low carbon steel. technical background [0002] Ultra-low carbon steel refers to steel with a carbon content of less than 0.003% for cold rolling. One of the technical difficulties in the production of this steel is the control of carbon content; its production process is complicated and its manufacturing technology is strict. Protected in the form of patents, it is regarded as the life of an enterprise; therefore, the manufacturing technology and product quality of ultra-low carbon steel plates are one of the important symbols to measure a country's special steel production and technological development level. [0003] Carbon has a great influence on the performance of ultra-low carbon steel, so carbon is a harmful element in ultra-low carbon steel, and the carbon content of finished products ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/111
Inventor 王正英彭会志张福陈永彦王岩屈党军杜震宇
Owner XIXIA LONGCHENG METALLURGICAL MATERIALS CO LTD
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