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Continuous casting mould fluxes and preparation method thereof

A technology of continuous casting mold flux and mold flux, which is applied in the field of continuous casting mold flux and its preparation, and can solve the problems of high surface defect rate of casting slabs

Inactive Publication Date: 2009-07-01
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the defect that the existing continuous casting mold slag is used to cast high-aluminum steel, and the surface defect rate of the slab is high, and to provide a continuous casting mold flux that can effectively reduce the surface defect rate of the slab when casting high-aluminum steel. Mold flux

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0026] The invention provides a method for preparing continuous casting mold flux, which comprises uniformly mixing a calcium-containing compound and an aluminum-containing compound, wherein the method also includes adding an additive selected from the melting point and the melting point of the mold flux. One or several compounds with reduced viscosity in the molten state, the amount of the additive reduces the melting point of the mold flux to 1000-1300°C, and the viscosity at 1300°C to 0.10-1.0 Pa·S; and In terms of oxides, in the mold flux, the weight ratio of the aluminum-containing compound to the calcium-containing compound is 0.3-1.5; based on the total amount of the mold flux, in terms of oxides, the content of the aluminum-containing compound is greater than Equal to 5% by weight.

[0027] According to the preparation method of the continuous casting mold flux provided by the present invention, the various components forming the continuous casting mold flux can be dir...

Embodiment 1

[0031] This example is used to illustrate the continuous casting mold flux provided by the present invention and its preparation method.

[0032] 43 kg of lime, 45.5 kg of bauxite, 3.5 kg of Na 2 CO 3 , 2 kg of magnesia and 7 kg of BaCO 3 (These raw materials are equivalent to 43 kg of CaO, 43 kg of Al 2 o 3 , 2 kg of Na 2 O, the MgO of 2 kilograms, the BaO of 6 kilograms) after mixing, with electric furnace it is melted and is prepared into the premelt material that particle diameter is 5-60 micron. Then this premelt is mixed with 1 kilogram of semi-reinforcing carbon black, 1 kilogram of super carbon black and 2 kilograms of graphite, then mix evenly with a mixer, and then mix 400 kilograms of water through a ball mill to make the mixture into a concentration of 20 wt. % of the slurry, and finally, under the conditions of a pressure of 2 MPa, an air inlet temperature of 800°C, an exhaust gas temperature of 200°C, and a nozzle diameter of 2 mm, the slurry is sent to the ...

Embodiment 2

[0039] This example is used to illustrate the continuous casting mold flux provided by the present invention and its preparation method.

[0040] 19 kg of lime, 11 kg of bauxite, 17 kg of Na 2 CO 3 , 10 kg of magnesia, 19 kg of BaCO 3 and 18.5 kg of quartz sand (these raw materials are equivalent to 20 kg of CaO, 10 kg of Al 2 o 3 , 10 kg of Na 2 O, 10 kg of MgO, 16 kg of BaO, 20 kg of SiO 2 ) are mixed and melted in an electric furnace to prepare a premelt with a particle diameter of 5-60 microns. Then this premelt is mixed with 1.4 kilograms of semi-reinforcing carbon black, 1.4 kilograms of super carbon black and 11.2 kilograms of graphite, then mix evenly with a mixer, and then mix 400 kilograms of water through a ball mill to make the mixture into a concentration of 20 wt. % of the slurry, and finally, under the conditions of a pressure of 2 MPa, an air inlet temperature of 800°C, an exhaust gas temperature of 200°C, and a nozzle diameter of 2 mm, the slurry is sent...

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PUM

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Abstract

The invention provides continuous casting protective slag, which contains a compound containing calcium and a compound containing aluminum, and an additive; the additive is selected from one or more compounds for reducing the melting point and viscosity of the protective slag in the melting state, and the dosage of the additive ensures that the melting point of the protective slag is reduced to between 1,000 and 1,300 DEG C and viscosity below 1,300 DEG C is reduced to between 0.1 and 1Pa.S; the weight ratio of the compound containing aluminum to the compound containing calcium in the protective slag by oxides is 0.3-1.5; and by taking total weight of the protective slag as a standard based on the oxides, the content of the compound containing aluminum is more than or equal to 5 percent of the total weight. Compared with the prior continuous casting protective slag, the continuous casting protective slag can effectively reduce the surface defect rate of casting blanks.

Description

technical field [0001] The invention relates to a continuous casting mold flux and a preparation method thereof. Background technique [0002] At present, there are many studies on continuous casting mold flux for casting high-strength low-alloy steel, austenitic stainless steel, peritectic steel and high-carbon steel, such as: [0003] Wang Qian reported in Iron and Steel Magazine, Vol. 38, No. 4, Pages 23-26, that by controlling the crystallization properties of mold slag, Chongqing Steel reduced the microcracks on the surface of 16Mn series high-strength low-alloy steel slabs from 22% to 1.0%. the following. The continuous casting mold flux is composed of: CaO is 41.18% by weight, SiO 2 36.48 wt%, Al 2 o 3 1.50 wt%, Fe 2 o 3 is 0.54% by weight, MgO is 5.62% by weight, F - 4.50% by weight, Na 2 O+K 2 O is 8.80 wt%, Al 2 o 3 / CaO is 0.04; or CaO is 42.47% by weight, SiO 2 38.24 wt%, Al 2 o 3 1.50 wt%, Fe 2 o 3 is 0.54% by weight, MgO is 5.62% by weight, F -...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/111
Inventor 曾建华张敏吴国荣陈永陈天明程兴德杨素波江南红陈靓段大富李茂林唐历
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP