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, which can solve the problems of poor effect, inability to reduce the rate of delamination defects, and low rate of delamination defects, and achieve the reduction of longitudinal cracks and subcutaneous cracks , Improve the operation safety, and reduce the effect of layer defect rate

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

[0005] The purpose of the present invention is to overcome the poor effect of the existing continuous casting mold powder on reducing the longitudinal cracks on the surface of the slab, and it cannot reduce the transverse cracks and subcutaneous network cracks on the surface of the slab, resulting in a finished stee

Method used

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Examples

Experimental program
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Example Embodiment

[0018] The preparation method of continuous casting mold flux provided by the present invention includes uniformly mixing calcium-containing compound, silicon-containing compound and aluminum-containing compound, wherein, the method further includes adding an additive selected from the group consisting of melting point and melting point of the mold flux. One or more of the compounds for reducing the viscosity in the state, the amount of the additive reduces the melting point of the mold flux to 1070-1170°C, and the viscosity at 1300°C to 0.2-0.4 Pa·S; and In terms of weight, the weight ratio of the calcium-containing compound to the silicon-containing compound in the mold flux is 0.95-1.15, and the weight ratio of the aluminum-containing compound to the calcium-containing compound is 0.15-0.5.

[0019] According to the preparation method of the continuous casting mold flux provided by the present invention, the continuous casting mold flux can be obtained by directly mixing var...

Example Embodiment

[0022] Example 1

[0023] This embodiment is used to illustrate the continuous casting mold flux and its preparation method provided by the present invention.

[0024] 30 kg of wollastonite, 6 kg of quartz sand, 15 kg of bauxite, 22 kg of Na 2 CO 3 , 14 kg of magnesia, 12 kg of fluorite (these raw materials are equivalent to 25 kg of CaO, 25 kg of SiO 2 , 12.5 kg of Al 2 O 3 , 12.5 kg of Na 2 O, 14 kg of MgO, 6 kg of F - ), 1 kg Fe 2 O 3 After mixing with 2 kg of MnO, it was melted in an electric furnace to prepare a pre-melt with a particle diameter of 5-60 microns. Then the pre-melted material is mixed with 1 kg of semi-reinforced carbon black and 1 kg of medium super carbon black, then mixed with a mixer, and then mixed with 400 kg of water, and the mixture is made into a slurry with a concentration of 20% by weight through a ball mill. Finally, under the conditions of a pressure of 2 MPa, an inlet air temperature of 800 °C, an exhaust gas temperature of 200 °C, an...

Example Embodiment

[0030] Example 2

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

[0032] 22 kg of wollastonite, 15 kg of limestone, 18 kg of cement clinker, 14 kg of quartz sand, 10 kg of bauxite, 9 kg of Na 2 CO 3 , 5 kg of magnesia, 6 kg of fluorite (these raw materials are equivalent to 39 kg of CaO, 34 kg of SiO 2 , 10 kg of Al 2 O 3 , 5 kg of Na 2 O, 5 kg of MgO, 3 kg of F - ) and 1 kg of Fe 2 O 3 After mixing, melt it with an electric furnace to make a pre-melt with a particle diameter of 5-60 microns, then mix the pre-melt with 1.25 kg of semi-reinforced carbon black and 1.75 kg of medium and super carbon black, and then mix with a mixer Evenly, mix 25 kg of water with a ball mill to make the mixture into a slurry with a concentration of 80% by weight. Finally, the pressure is 2 MPa, the air inlet temperature is 800 °C, the smoke exhaust temperature is 200 °C, and the diameter of the ...

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Abstract

The invention provides continuous casting protection slag, which contains a calcium-contained compound, a silicon-contained compound and an aluminum-contained compound, wherein the protection slag also contains an addictive; the addictive selects from one or more of compounds which make the melting point and the viscocity in the melting state of the protection slag reduced; the dosage of the addictive makes the melting point of the protection slag reduced to be between 1,070 and 1,170 DEG C, and the viscocity of the protection slag at the temperature of 1,300 DEG C reduced to be between 0.2 and 0.4 Pa.S; and based on oxide, the weight ratio of the calcium-contained compound to the silicon-contained compound of the protection slag is between 0.95 and 1.15, and the weight ratio of the aluminum-contained compound to the silicon-contained compound is between 0.15 and 0.5. Compared with the prior continuous casting protection slag, the continuous casting protection slag provided by the invention can effectively reduce longitudinal cracks, transverse cracks and subsurface meshy cracks on the surface of casting banks, and the splitting defect rate of steel finished products subjected to casting blank rolling is lower.

Description

technical field [0001] The invention relates to a continuous casting mold flux and a preparation method thereof. Background technique [0002] The content of Cu, Cr, Ni, Al, V, N elements in the composition of vanadium-containing high-nitrogen steel is relatively high, and the carbon content is also just in the peritectic reaction zone. The unique composition determines the casting difficulty of this steel type , such as [C], [Cu], [Cr], [Ni], [Al], [V] and [N] in the steel have a great influence on the surface quality and subcutaneous quality of the slab, especially those containing vanadium, aluminum and high nitrogen Steel, [Al], [V] in solid solution at high temperature will be dynamically precipitated or statically precipitated in the form of AlN, V(CN) at the austenite grain boundary when the temperature decreases, increasing the source of stress concentration and crack sensitivity, arc When the caster slab is straightened, the inner arc is subjected to tensile stress...

Claims

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Application Information

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IPC IPC(8): B22D11/111
Inventor 曾建华吴国荣陈永周伟杨素波张均祥李茂林杨秀亮唐生斌
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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