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Preparation method of magnesium-carbon composite monolithic stopper rod for continuous casting

An integral stopper, magnesium carbon technology, applied in the direction of casting equipment, manufacturing tools, metal processing equipment, etc., can solve the problems of thermal shock resistance not mentioned, poor thermal shock resistance, etc., to prevent broken ends, reduce Generation of thermal stress, effect of improving thermal shock resistance

Inactive Publication Date: 2010-06-09
SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] CN200610030706.8 discloses a method for preparing a low-carbon magnesia composite integral stopper. Although the material has high erosion resistance, it is well known that low-carbon magnesia-carbon materials have poor thermal shock resistance. How to improve the material Thermal Shock Resistance The patent does not mention

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Example 1: Corundum accounts for 68% of the aluminum carbon material on the rod body, 26% of graphite, 2% of SiC, and 3% of Si; 87% of magnesia, 8% of graphite, and 3% of aluminum-silicon alloy powder in the magnesium carbon material of the rod head %, BN2%. Wherein graphite particle size composition is > 0.5mm accounts for 25%, 0.5~0.01mm accounts for 40%, <0.01mm accounts for 35%; Silicon content is 50% in the aluminum-silicon alloy powder, and the adding height of mixture is 5mm in this embodiment, The added rod head material is uniformly mixed according to the ratio of raw materials and granulated; the pressure of isostatic pressing is 110Mpa, and the whole stopper rod is heat-treated in a nitrogen atmosphere, and the heat-treatment temperature is 950°C.

Embodiment 2

[0012] Example 2: Corundum accounts for 74%, graphite accounts for 20%, SiC adds 5%, and Si adds 1% in the aluminum carbon material of the rod body; magnesia in the rod head magnesium carbon material is 86%, graphite 10%, and aluminum-silicon alloy powder 3 %, BN1%. Wherein graphite particle size composition is > 0.5mm accounts for 45%, 0.5~0.01mm accounts for 30%, <0.01mm accounts for 25%; Silicon content is 50% in the aluminum-silicon alloy powder, and the addition height of the mixture is 8mm in this embodiment, The added rod head material is uniformly mixed according to the ratio of raw materials and granulated; the pressure of isostatic pressing is 112Mpa, and the whole stopper rod is heat-treated in a nitrogen atmosphere at a temperature of 1000°C.

Embodiment 3

[0013] Example 3: Corundum accounts for 75%, graphite accounts for 22%, SiC adds 2%, Si adds 1% in the aluminum carbon material of the rod body; magnesia 84%, graphite 12% in the rod head magnesium carbon material, aluminum-silicon alloy powder 5% %, BN1%. Wherein graphite particle size composition is > 0.5mm accounts for 35%, 0.5~0.01mm accounts for 50%, <0.01mm accounts for 15%; Silicon content is 70% in the aluminum-silicon alloy powder, and the adding height of mixture is 10mm in this embodiment, The added rod head material is uniformly mixed according to the ratio of raw materials and granulated; the pressure of isostatic pressing is 112Mpa, and the whole stopper rod is heat-treated in a nitrogen atmosphere, and the heat-treatment temperature is 1100°C.

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Abstract

The invention belongs to the technical field of novel fire resistant material preparation and provides a preparation method of a magnesium-carbon composite monolithic stopper rod for continuous casting. The rod body of the monolithic stopper rod is made of an aluminum-carbon material, the rod head is made of a low carbon magnesium-carbon material, and the mixing transition of the aluminum-carbon material and the low-carbon magnesium-carbon material is adopted between the rod head and the rod body. A main raw material of the material of the rod head is fused magnesia, and 3-8 percent by weight of aluminum-silicon alloy power, 0.5-2 percent by weight of BN and 8-12 percent by weight of graphite are also added. The safety when in use is guaranteed through optimizing the grain composition of the graphite used by the magnesium-carbon material and adding the aluminum-silicon alloy capable of forming a ceramic binding phase in a heat treatment process and the BN capable of reducing the thermal expansion coefficient to improve the thermal shock resistance of the magnesium-carbon material. In addition, the uniform mixing transition between the rod head material and the rod body material is formed, and the generation of thermal stress is reduced as much as possible during thermal shocks so as to prevent end break phenomena when in use.

Description

technical field [0001] The invention belongs to the technical field of preparation of new refractory materials, and mainly relates to a preparation method of a magnesium-carbon composite integral stopper for continuous casting. Background technique [0002] The integral stopper rod is used in the continuous casting tundish, and the flow of molten steel flowing into the crystallizer is controlled through the cooperation of the stopper rod head and the submerged nozzle bowl. The use of stopper rods can reduce the accident rate and improve the quality of steel billets. Argon blowing holes can also be designed in the integral stopper rod to blow argon to the submerged nozzle to prevent the nozzle from being blocked. At present, the material of the overall stopper body is mainly aluminum carbon, and contains a certain amount of fused silica. When in use, the overall stopper rod has to withstand the thermal shock of about 1560 ° C to 1100 ° C. The overall stopper rod must have a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D41/18C04B35/66
Inventor 李红霞刘国齐于建宾闫广周杨文刚马天飞黄辉
Owner SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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