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Monolithic stopper used for continuous casting, and preparation method thereof

An integral stopper and continuous casting technology, which is applied in the field of refractory materials for steelmaking, can solve the problems of long-term continuous casting, high raw material cost, and high price, and meet the performance requirements and product quality requirements of multi-furnace continuous casting. Strong resistance to slag erosion and good thermal shock stability

Active Publication Date: 2013-01-30
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to improve the service life of the overall stopper rod, according to the different types of cast steel, the rod head can be made of Al 2 o 3 -C quality, MgO-C quality or ZrO 2 - C material, when the vacuum degree is high, MgO will react with C, resulting in accelerated rod head erosion; when the Ca content in molten steel is high, it will react with Al 2 o 3 Reaction, speed up rod head erosion, can not be cast for a long time; ZrO 2 -C-quality stopper rods are generally suitable for casting various steels, but the cost of raw materials is high, the price is expensive, and the use is limited

Method used

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  • Monolithic stopper used for continuous casting, and preparation method thereof

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Effect test

Embodiment 1

[0030] The raw materials and mass percentages used in the rod head in this embodiment are not more than 55% of 1mm SiC particles, not more than 15% of 325 mesh SiC powder, not more than 25% of 325 mesh graphite powder, not more than 325 mesh AlN powder 4%, not more than 325 mesh of AlN powder. 1% of Si powder larger than 325 mesh, plus 4% of phenolic resin; the raw materials and mass percentages used for the rod body are 55% of white corundum particles not larger than 1mm, 20% of white corundum powder not larger than 325 mesh, and graphite not larger than 325 mesh Powder 25%, plus 4% phenolic resin.

[0031] The preparation process of the integral stopper rod for continuous casting is as follows: after the raw materials of the rod head and the rod body are matched in proportion, they are mixed and granulated by a granulator, and the raw materials are dried and formed by an isostatic press. The raw material of the rod body is added to the mold twice, and the green body obtained...

Embodiment 2

[0033] The raw materials and mass percentages used in the rod head in this embodiment are not more than 64% of 1mm SiC particles, not more than 12% of 325 mesh SiC powder, not more than 20% of 325 mesh graphite powder, not more than 325 mesh AlN powder 3%, not more than 325 mesh of AlN powder. 1% of Si powder larger than 325 mesh, plus 7% of phenolic resin; the raw materials and mass percentages used for the rod body are 65% of brown corundum particles not larger than 1mm, 15% of brown corundum powder not larger than 325 mesh, and not larger than 325 mesh 20% graphite powder, plus 7% phenolic resin.

[0034] The preparation process is as follows: after mixing the raw materials of the rod head and the rod body in proportion, use a granulator to carry out mixing and granulation respectively, and after the raw materials are dried, use an isostatic press to form them, and the rod head and rod body raw materials are added in two times Mold, the compacted green body is baked in a re...

Embodiment 3

[0036] The raw materials and mass percentages used in the rod head in this embodiment are not more than 60% of 1mm SiC particles, not more than 12.5% ​​of 325 mesh SiC powder, not more than 22.5% of 325 mesh graphite powder, not more than 325 mesh AlN powder 3%, not more than 325 mesh of SiC powder. 2% Si powder larger than 325 mesh, plus 5% phenolic resin; the raw materials and mass percentages used for the rod body are 60% of sub-white corundum particles not larger than 1mm, 17.5% of sub-white corundum powder not larger than 325 mesh, no More than 325 mesh graphite powder 22.5%, plus 5% phenolic resin.

[0037] The preparation process is as follows: after mixing the raw materials of the rod head and the rod body in proportion, use a granulator to carry out mixing and granulation respectively, and after the raw materials are dried, use an isostatic press to form them, and the rod head and rod body raw materials are added in two times Mold, the compacted green body is baked in...

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Abstract

The invention relates to a monolithic stopper used for continuous casting, and a preparation method of the monolithic stopper; the monolithic stopper comprises a stopper head and a stopper body, wherein the stopper head comprises the following components by mass percent: 55-65% of SiC particles with the particle size less than or equal to 1mm, 12-15% of SiC powder with the particle size less than or equal to 325 meshes, 20-25% of graphite powder with the particle size less than or equal to 325 meshes, 2-4% of AlN powder with the particle size less than or equal to 325 meshes, 1-3% of Si powder with the particle size less than or equal to 325 meshes and 4-7% of phenolic resin; and the stopper body comprises the following components by mass percent: 55-65% of aluminum-containing raw material particles with the particle size less than or equal to 1mm, 15-20% of aluminum-containing raw material powder with the particle size less than or equal to 325 meshes, 20-25% of graphite powder with the particle size less than or equal to 325 meshes and 4-7% of phenolic resin. The monolithic stopper used for continuous casting has the characteristics of being high in slag erosion resistance, good in thermal shock stability, and high in strength, having anti-scouring performance and high temperature resistance, and the like, and has the service life more than 12h, thus meeting the multi-furnace continuous casting performance requirement and the product quality requirement.

Description

technical field [0001] The invention relates to the technical field of refractory materials for steelmaking, in particular to an integral stopper for continuous casting and a preparation method thereof. Background technique [0002] As one of the three major components of continuous casting (stopper, long nozzle, submerged nozzle), the stopper rod is installed in the tundish, cooperates with the built-in submerged nozzle or the upper nozzle of the tundish, and controls the flow of molten steel from the tundish during the continuous casting process. Flow rate to the mold to ensure the stability of the molten steel level in the mold and the stability of the continuous casting process and quality. [0003] The stopper rod is subjected to the thermal shock of high-temperature molten steel and the wear of the sliding surface during flow control. It needs to have good thermal shock resistance, peeling resistance and corrosion resistance to ensure safety and reliability under harsh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D41/18C04B35/66
Inventor 杨建华
Owner BAOSHAN IRON & STEEL CO LTD
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