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Diffusing argon blowing stopper rod for continuous casting and manufacturing method for stopper rod

A dispersive and stopper technology, which is applied to casting equipment, manufacturing tools, casting molten material containers, etc., can solve problems such as uneven distribution of argon gas, fluctuation of crystallizer liquid level, and inability to clean flocs, etc. Argon effect, improved flow control accuracy, and low cost

Inactive Publication Date: 2015-09-09
UNIV OF SCI & TECH LIAONING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During use, the argon gas blown through the air guide hole is relatively concentrated, and large bubbles are easily formed in the molten steel, resulting in fluctuations in the liquid level of the crystallizer; in addition, impurities in the molten steel are easily deposited on the surface of the stopper tip to affect the flow control of the stopper tip Accuracy, while the current single-hole or multi-hole stopper blows the argon gas distribution through the air guide hole unevenly and in a dot-like distribution, which cannot effectively remove the floc deposited on the surface of the stopper head

Method used

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  • Diffusing argon blowing stopper rod for continuous casting and manufacturing method for stopper rod
  • Diffusing argon blowing stopper rod for continuous casting and manufacturing method for stopper rod
  • Diffusing argon blowing stopper rod for continuous casting and manufacturing method for stopper rod

Examples

Experimental program
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Effect test

Embodiment 1

[0042] In this embodiment, the stopper head 1 is composed of the following components in proportion by weight: 15 parts of flake graphite; 80 parts of corundum; 3 parts of metal silicon powder; 2 parts of starch as a burn-off agent; resin. The stopper rod body 2 is made of conventional materials, and will not be described in detail here.

[0043] The manufacturing process of the diffuse argon-blowing stopper rod for continuous casting in this embodiment is as follows:

[0044] 1) Ingredients: Weigh the raw materials of stopper head 1 according to the weight ratio;

[0045] 2) Mixing: add the raw material of stopper head 1 into the high-speed mixer in turn, and mix evenly to form the stopper head material, dry it for later use; and mix the stopper bar body material according to the conventional process for later use;

[0046] 3) Molding: Add the mixed stopper rod head material and stopper rod body material into the mold respectively, and form it in an isostatic pressing devic...

Embodiment 2

[0053] In this embodiment, the stopper tip 1 is composed of the following components in proportion by weight: 10 parts of flake graphite, 82 parts of corundum, 2 parts of boron carbide, 3 parts of aluminum-magnesium alloy powder, 4 parts of dextrin as a loss-of-burn agent, plus the above-mentioned 9% phenolic resin by total weight of ingredients. The stopper rod body 2 is made of conventional materials, which will not be described in detail here.

[0054] The manufacturing process of the diffused argon-blowing stopper for continuous casting in this example is the same as in Example 1, wherein the molding pressure during the molding process is 140 MPa; during the firing process, the temperature is kept at 1100° C. for 6.5 hours in a carbon-reducing atmosphere.

[0055] After testing, the physical performance indicators of the stopper head 1 manufactured in this embodiment are: apparent porosity 24.3%, bulk density 2.40g / cm3, room temperature flexural strength 8.4Mpa.

Embodiment 3

[0057]In the present embodiment, the plug head 1 is composed of the following components by weight: 5 parts of flake graphite, 81 parts of corundum, 2 parts of boron carbide, 3 parts of metal silicon powder, 2 parts of aluminum-magnesium alloy powder, and the loss-on-ignition agent is polyethylene 7 parts, plus 7% of the phenolic resin by the total weight of the above components. The stopper rod body 2 is made of conventional materials, which will not be described in detail here.

[0058] The manufacturing process of the dispersive argon blowing plug for continuous casting in this example is the same as that of Example 1, wherein the molding pressure during the molding process is 150 MPa; during the firing process, under a carbon reducing atmosphere, the temperature is kept at 1200 ° C for 7 hours and fired.

[0059] After testing, the physical performance indicators of the stopper head 1 made in this embodiment are: apparent porosity of 25.5%, bulk density of 2.32g / cm3, and f...

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Abstract

The invention relates to a diffusing argon blowing stopper rod for continuous casting and a manufacturing method for the stopper rod. The stopper rod is formed by a stopper rod body and a stopper rod head fixed on the front end of the stopper rod body, wherein an argon channel to the stopper rod head is formed in the stopper rod body; the stopper rod head is made from porous material; and argon is diffusedly blown into molten steel via porous material. The manufacturing method comprises material preparation, mixture, formation, sintering, machinery processing, coating and packing. Compared with the prior art, the beneficial effects of the diffusing argon blowing stopper rod for continuous casting and the manufacturing method for the stopper rod are that air guide holes are unnecessary for the stopper rod head; argon is blown via the porous material having great apparent porosity, so argon can be evenly blown and impurities accumulated on the stopper rod head can be removed; control current precision can be improved; compared with a common stopper rod, effects on liquid level fluctuation of a crystallizer by large bubbles due to concentrated argon blowing can be avoided, so argon blowing effect can be enhanced; the stopper rod head having apparent porosity greater than 20%is made from with addition of ignition lost agent to raw material; and simple manufacturing method is provided and low cost is achieved.

Description

technical field [0001] The invention relates to a stopper rod for continuous casting, in particular to a diffuse argon blowing stopper rod for continuous casting and a manufacturing method thereof. Background technique [0002] The stopper rod is a refractory material rod installed in the tundish to control the opening and closing of the nozzle and the flow of molten steel by lifting displacement. It is composed of a stopper rod body and a stopper rod head. The plug bricks are connected, and the middle sleeve bricks. The stopper rod is a key functional refractory material in the production of continuous steel casting. It cooperates with the upper nozzle of the tundish to control the steel flow from the tundish to the crystallizer, and blows argon gas into the flow steel channel through the stopper rod to prevent the flow of steel in the channel. Due to the clogging of inclusion deposits, the quality of molten steel can be improved and the continuous casting production can b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D41/18
Inventor 李轼保李波王仁贵李涛胡晓光官阳亮高玉明
Owner UNIV OF SCI & TECH LIAONING
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