A reusable preheating-free shroud and its manufacturing method

A long shroud, no preheating technology, used in manufacturing tools, casting equipment, casting melt containers, etc., can solve problems such as thermal shock cracking, and achieve the effects of alleviating thermal stress, low thermal conductivity, and low thermal expansion

Active Publication Date: 2017-05-10
UNIV OF SCI & TECH LIAONING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the pouring time is over and the long nozzle is completely cooled down, when it is poured again from the cold state and reused, the problem of thermal shock cracking will easily occur

Method used

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  • A reusable preheating-free shroud and its manufacturing method
  • A reusable preheating-free shroud and its manufacturing method
  • A reusable preheating-free shroud and its manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The prepared reusable outer layer body 1 of the preheating-free shroud is composed of ingredients according to mass percentage:

[0045]

[0046] The prepared reusable lining 2 of the preheating-free shroud is composed of ingredients according to mass percentage:

[0047]

[0048] The manufacturing process of the above-mentioned reusable no-preheat shroud is as follows:

[0049] 1) Put the bulk raw materials weighed according to the proportion and the added powdered phenolic resin into the mixer for pre-mixing for 3 minutes, then add furfural solvent, after all the above components are mixed evenly, dry at 90°C for 1 Hours to a volatile content suitable for molding, as a body blank for use;

[0050] 2) Put the lining raw materials weighed according to the ratio and the added powdered phenolic resin into the mixer for pre-mixing for 3 minutes, then add furfural solvent, mix all the above components evenly, and dry at 90°C 1 hour to the volatile content suitable f...

Embodiment 2

[0057] The prepared reusable outer layer body of the preheating-free shroud is composed of ingredients according to mass percentage:

[0058]

[0059] The prepared reusable lining material of the no-preheating shroud is composed of ingredients according to mass percentage:

[0060]

[0061] In this embodiment, the manufacturing process of the reusable preheating-free shroud is the same as that in Embodiment 1.

Embodiment 3

[0063] The prepared reusable outer layer body of the preheating-free shroud is composed of ingredients according to mass percentage:

[0064]

[0065]

[0066] The prepared reusable lining of the preheating-free shroud is composed of ingredients according to mass percentage:

[0067]

[0068] In this embodiment, the manufacturing process of the reusable preheating-free shroud is the same as that in Embodiment 1.

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Abstract

The invention relates to a reusable preheating-free shroud and a manufacturing method thereof. The reusable preheating-free shroud body is composed of the following components in mass percentage: flake graphite 22-30%, plate-shaped corundum 45-55% %, 5-20% fused zirconia mullite, 3-8% α-light-burned alumina, 3-8% other additives, plus 8-12% powdered phenolic resin and 5-8% furfural ;The lining is composed of the following components by mass percentage: 70-85% of alumina hollow balls, 5-20% of tabular corundum, 3-10% of α-light-burned alumina, 1-3% of titanium oxide, and other additives 1-3%, plus 2-5% powdered phenolic resin and 3-5% furfural of the total mass of the lining; other additives are one or more of borax, boron carbide, and metal silicon powder. The invention not only retains the characteristics of low heat conduction and low thermal expansion of the inner lining material, which can relieve the thermal impact of high-temperature molten steel on the outer body of the outer layer during pouring, but also has strong anti-scouring ability of molten steel and can be reused.

Description

technical field [0001] The invention relates to a functional refractory material for continuous casting of iron and steel, in particular to a reusable long nozzle without preheating for continuous casting and a manufacturing method thereof. Background technique [0002] The shroud is an important functional refractory product in the continuous casting process of iron and steel. When in use, it is connected with the ladle nozzle through a slide mechanism to transport molten steel from the ladle to the tundish to protect pouring and prevent secondary oxidation of molten steel. At present, almost all long nozzles are non-preheating type, that is, they are used directly from the cold state and do not need to be preheated before pouring. When in use, the shroud has to withstand the huge thermal impact of the high-temperature molten steel on the material of the shroud at the initial pouring stage, the erosion and corrosion of the inner wall by the molten steel during the entire po...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D41/54
Inventor 李波李轼保刘绍杰高玉明胡晓光徐占魁王仁贵李涛
Owner UNIV OF SCI & TECH LIAONING
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