Continuous casting mould fluxes and preparation method thereof

A continuous casting mold flux and mold flux technology, applied in the field of continuous casting mold flux and its preparation, can solve the problems of low layer defect rate, poor effect, inability to reduce the layer defect rate, etc., and achieve a low layer defect rate. Effect

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 steel product after the slab is rolled. It provides a continuous casting protection that can effectively reduce the longitudinal cracks, transverse cracks and subcutaneous network cracks on the surface of the slab, so that the finished steel product after the slab is rolled has a low rate of delamination defects. slag

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0018] The preparation method of the continuous casting mold flux provided by the present invention includes uniformly mixing calcium-containing compounds, silicon-containing compounds and aluminum-containing compounds, wherein the method also includes adding additives, and the additives are selected from making the melting point and melting point of the mold flux One or more of the compounds with reduced viscosity in the state, the amount of the additives reduces the melting point of the mold flux to 1160-1260°C, and the viscosity at 1300°C is reduced to greater than 0.4Pa·S to 0.8Pa· S; and in terms of oxides, the weight ratio of the calcium-containing compound to the silicon-containing compound in the mold flux is 0.7-1, 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 various components forming the co...

Embodiment 1

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

[0024] 10 kg of wollastonite, 26 kg of quartz sand, 20 kg of limestone, 4 kg of bauxite, 10 kg of Na 2 CO 3 , 5 kg of magnesia, 8 kg of fluorite (these raw materials are equivalent to 26.5 kg of CaO, 37.5 kg of SiO 2 , 4 kg of Al 2 o 3 , 6.3 kg of Na 2 O, 4.7 kg of MgO, 4 kg of F - ), 2 kg Fe 2 o 3 After mixing with 2 kg of MnO, it is melted in an electric furnace to prepare a premelt with a particle diameter of 5-60 microns. Then this premelt is mixed with 3 kilograms of semi-reinforcing carbon black, 3.5 kilograms of super carbon black and 6.5 kilograms of graphite, then mix evenly with a stirrer, and then mix 400 kilograms of water and make the mixture into a concentration of 20% by weight through a ball mill % of the slurry, and finally, under the conditions of a pressure of 2 MPa, an air inlet temperature of 800°C, an exhaust g...

Embodiment 2

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

[0032] 33 kg of lime, 35 kg of quartz sand, 8 kg of bauxite, 8 kg of Na 2 CO 3 , 3 kg of magnesia, 4 kg of fluorite (these raw materials are equivalent to 37 kg of CaO, 39 kg of SiO 2 , 8 kg of Al 2 o 3 , 5 kg of Na 2 O, 3 kg of MgO, 2 kg of F - ) and 1 kg of Fe 2 o 3 After mixing, it is melted with an electric furnace to form a premelt with a particle diameter of 5-60 microns, and then the premelt is mixed with 1 kg of semi-reinforcing carbon black, 1 kg of super carbon black and 3 kg of graphite , then mix evenly with a mixer, and then mix 25 kg of water through a ball mill to make the mixture into a slurry with a concentration of 80% by weight. Under the condition that the diameter is 2 mm, the slurry is sent to the spray granulation drying tower by a pressure pump for granulation and drying, and then the particle size range of 0...

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PUM

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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 1,160 and 1,260 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 0.7 and 1, 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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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/111
Inventor 曾建华吴国荣陈永杨素波张均祥李茂林杨秀亮陈靓
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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