CN109115353B - Method for manufacturing continuous temperature measuring tube of tundish molten steel - Google Patents

Method for manufacturing continuous temperature measuring tube of tundish molten steel Download PDF

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CN109115353B
CN109115353B CN201811200388.4A CN201811200388A CN109115353B CN 109115353 B CN109115353 B CN 109115353B CN 201811200388 A CN201811200388 A CN 201811200388A CN 109115353 B CN109115353 B CN 109115353B
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silicon carbide
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CN109115353A (en
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宋振亚
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Abstract

A manufacturing method of a tundish molten steel continuous temperature measuring tube comprises an inner layer and an outer layer, wherein the inner layer and the outer layer are both 7-9 mm thick, and the outer layer is composed of 20-30% of silicon carbide particles, 15-25% of magnesium oxide stabilized capacitance zirconia, 25-30% of silicon carbide powder, 5-7% of aluminum nitride, 10-15% of hexagonal boron nitride and 8-12% of a silicon resin adhesive; the inner layer consists of 15-25% of silicon carbide particles, 20-30% of silicon carbide powder, 15-25% of crystalline flake graphite, 15-35% of alumina micropowder and 8-12% of silicone resin adhesive; and brushing a protective layer consisting of boric acid and silicon carbide micro powder on the surface. The continuous temperature measuring tube for the tundish molten steel has the advantages of molten steel corrosion resistance, long service life, high thermal conductivity and short reaction time to temperature change.

Description

Method for manufacturing continuous temperature measuring tube of tundish molten steel
Technical Field
The invention relates to a manufacturing method of a continuous temperature measuring tube of tundish molten steel, which is used for continuously monitoring the temperature of the tundish molten steel.
Background
In the continuous casting production process of billets (referred to as continuous casting), the temperature of tundish molten steel is one of the most important parameters for guiding continuous casting operation, controlling the quality of casting blanks and reducing the leakage accidents. The disposable rapid thermocouples developed at the end of the 50 s and early 60 s of the twentieth century became the standard, and almost the only, technology for measuring tundish molten steel temperature over the past half century. The disposable rapid thermocouple generally needs to be manually inserted into a tundish every 5-10 minutes for intermittent temperature measurement, and the following defects exist in measurement: (1) the labor intensity of point measurement workers is high, the working environment is severe, and molten steel splashing can be caused to cause the risk of personnel injury; (2) the quality, the insertion position and the insertion depth of the rapid thermocouple affect the accuracy and the stability of temperature measurement; (3) the process temperature of continuous change of the molten steel in the tundish cannot be obtained by intermittent measurement, and the development trend of automation is not met. With the development of the continuous casting technology of the billet and the development of the variety, the control of the continuous change process of the temperature of the molten steel of the continuous casting tundish is very important. The temperature measurement by using the disposable rapid thermocouple needs frequent repeated measurement, so that the temperature measurement cost is high, the labor intensity is high, the continuous change process of the temperature of molten steel in a tundish cannot be really reflected from the quality control, quality accidents are often caused due to improper temperature control, and the influence on steel types with strict quality requirements is larger. Therefore, the continuous temperature measurement technology of the continuous casting tundish molten steel becomes a technical problem to be solved urgently.
At present, various large steel mills continuously start to use the technology of continuously measuring the temperature of the molten steel in the tundish, a continuous temperature measuring tube is inserted below the liquid level of the molten steel in the tundish and is fixed in position, and a temperature measuring thermocouple is arranged in a sleeve body of the tube, so that the continuous monitoring of the temperature of the molten steel in the tundish is realized. However, with the progress of cost reduction and efficiency improvement of each large steel enterprise, the operation time of the tundish needs to be prolonged urgently, the production operation efficiency is improved, and higher requirements are put forward on the service life of the continuous temperature measuring pipe of the tundish.
On the other hand, most of the conventional tundish molten steel continuous temperature measuring pipes are made of aluminum carbon, the thickness of the pipe is more than 30mm due to the fact that the pipe cannot resist molten steel erosion, and the pipe is low in heat conductivity, so that the response time to the temperature change of tundish molten steel is long, and a certain temperature runaway risk exists.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a manufacturing method of a continuous temperature measuring tube of tundish molten steel.
The scheme for solving the technical problems is as follows:
a manufacturing method of a tundish molten steel continuous temperature measuring pipe comprises the steps that the tundish molten steel continuous temperature measuring pipe is composed of an inner layer and an outer layer, and the thicknesses of the inner layer and the outer layer are 7-9 mm respectively; the manufacturing process comprises the following steps: the method comprises the following steps of (1) putting an outer layer material and an inner layer material into a rubber mold by using a special tool, sealing, placing the rubber mold under the pressure of 150-200 MPa for cold isostatic pressing for molding, painting a protective layer on the outer surface of a tube blank after demolding, drying the tube blank in the air, and finally placing the tube blank in a reducing atmosphere at 1050-1150 ℃ for roasting for 2.5-3 hours;
the weight ratio of the outer layer material is as follows: 20-30% of silicon carbide particles with the particle size of 600-830 microns, 15-25% of magnesia stabilized capacitive zirconia with the particle size of 150-230 microns, 25-30% of silicon carbide powder with the particle size of 25-45 microns, 5-7% of aluminum nitride with the particle size of 0.5-2 microns, 10-15% of hexagonal boron nitride with the particle size of 2-5 microns and 8-12% of liquid silicone resin;
the weight ratio of the inner layer material is as follows: 15-25% of silicon carbide particles with the particle size of 600-830 microns, 20-30% of silicon carbide powder with the particle size of 45-75 microns, 15-25% of crystalline flake graphite, 15-35% of aluminum oxide micro powder with the particle size of 1.5-3 microns and 8-12% of silicone resin;
the coating protective layer comprises the following components in parts by weight: 60-70% of water, 4.5-5% of boric acid and 25-35% of silicon carbide micro powder with the particle size of 2-5 microns.
Researches show that the affinity of the outer layer material of the molten steel continuous temperature measurement protective sleeve mainly based on non-oxides with oxides and steel slag in the molten steel is low, and particularly due to the addition of the hexagonal boron nitride serving as an inert material, the molten steel and the steel slag cannot wet the outer surface of the protective sleeve, so that the molten steel corrosion resistance is excellent, the service life of the protective sleeve is greatly prolonged, and the wall thickness can be reduced on the premise of designing the same service time. As for the inner layer material of the protective sleeve, the inner space of the protective sleeve is isolated from oxygen, so that graphite is difficult to be oxidized and burnt, and the cost is saved by replacing hexagonal boron nitride with a large amount of graphite. In addition, research experiments show that the thickness of the protective sleeve is reduced while a large amount of high-temperature-resistant materials such as silicon carbide, hexagonal boron nitride, aluminum nitride, graphite and the like are used, the response time of the temperature change inside and outside the protective sleeve is greatly reduced, and the real-time monitoring on the temperature of the tundish is remarkably effective.
Drawings
FIG. 1 is a schematic view of a continuous temperature measuring tube structure for tundish molten steel.
Detailed Description
The present invention is further illustrated by the following specific examples.
The tundish molten steel continuous temperature measuring tube comprises an outer layer 1 and an inner layer 2, wherein the outer layer and the inner layer are both sleeves with one closed ends, and the thickness of each inner layer and the thickness of each outer layer are 7-9 mm; the manufacturing method comprises the following steps:
example 1: the method comprises the following steps:
(1) preparing an outer layer material: the weight ratio of the outer layer material is as follows: 20% of silicon carbide particles with the particle size of 600-830 micrometers, 25% of magnesia stabilized capacitance zirconia with the particle size of 150-230 micrometers, 30% of silicon carbide powder with the particle size of 25-45 micrometers, 5% of aluminum nitride with the particle size of 0.5-2 micrometers, 10% of hexagonal boron nitride with the particle size of 2-5 micrometers and 10% of liquid silicone resin;
(2) preparing an inner layer material: the weight ratio of the inner layer material is as follows: 15% of silicon carbide particles with the particle size of 600-830 microns, 29% of silicon carbide powder with the particle size of 45-75 microns, 15% of crystalline flake graphite, 21% of aluminum oxide micro powder with the particle size of 1.5-3 microns and 10% of silicone resin;
(3) preparing a protective layer coating: the coating protective layer comprises the following components in parts by weight: 65% of water, 5% of boric acid and 30% of silicon carbide micro powder with the particle size of 2-5 microns.
(4) And (3) loading the outer layer material obtained in the step (1) and the inner layer material obtained in the step (2) into a rubber mold by using a special tool, wherein the loading amount ensures that the final thicknesses of the inner layer and the outer layer are respectively 8 mm, sealing, placing under the pressure of 180MPa for cold isostatic pressing for molding, painting the protective layer coating obtained in the step (3) on the outer surface of the tube blank after demolding, airing, and finally placing in a reducing atmosphere for roasting at 1100 ℃ for 3 hours.
Example 2: the method comprises the following steps:
(1) preparing an outer layer material: the composite material is characterized in that the outer layer material comprises the following components in parts by weight: 23% of silicon carbide particles with the particle size of 600-830 micrometers, 20% of magnesia stabilized capacitance zirconia with the particle size of 150-230 micrometers, 30% of silicon carbide powder with the particle size of 25-45 micrometers, 6% of aluminum nitride with the particle size of 0.5-2 micrometers, 11% of hexagonal boron nitride with the particle size of 2-5 micrometers and 10% of liquid silicone resin;
(2) preparing an inner layer material: the material is characterized in that the weight ratio of the inner layer material is as follows: 18% of silicon carbide particles with the particle size of 600-830 microns, 28% of silicon carbide powder with the particle size of 45-75 microns, 19% of crystalline flake graphite, 25% of aluminum oxide micro powder with the particle size of 1.5-3 microns and 10% of silicone resin;
(3) preparing a protective layer coating: the paint is characterized in that the paint protective layer comprises the following components in parts by weight: 65% of water, 5% of boric acid and 30% of silicon carbide micro powder with the particle size of 2-5 microns.
(4) And (3) loading the outer layer material obtained in the step (1) and the inner layer material obtained in the step (2) into a rubber mold by using a special tool, wherein the loading amount ensures that the final thicknesses of the inner layer and the outer layer are respectively 8 mm, sealing, placing under the pressure of 180MPa for cold isostatic pressing for molding, painting the protective layer coating obtained in the step (3) on the outer surface of the tube blank after demolding, airing, and finally placing in a reducing atmosphere for roasting at 1100 ℃ for 3 hours.
Example 3: the method comprises the following steps:
(1) preparing an outer layer material: the composite material is characterized in that the outer layer material comprises the following components in parts by weight: 25% of silicon carbide particles with the particle size of 600-830 micrometers, 16% of magnesia stabilized capacitance zirconia with the particle size of 150-230 micrometers, 30% of silicon carbide powder with the particle size of 25-45 micrometers, 6% of aluminum nitride with the particle size of 0.5-2 micrometers, 12% of hexagonal boron nitride with the particle size of 2-5 micrometers and 11% of liquid silicone resin;
(2) preparing an inner layer material: the material is characterized in that the weight ratio of the inner layer material is as follows: 20% of silicon carbide particles with the particle size of 600-830 microns, 25% of silicon carbide powder with the particle size of 45-75 microns, 20% of crystalline flake graphite, 25% of aluminum oxide micro powder with the particle size of 1.5-3 microns and 10% of silicone resin;
(3) preparing a protective layer coating: the paint is characterized in that the paint protective layer comprises the following components in parts by weight: 65% of water, 5% of boric acid and 30% of silicon carbide micro powder with the particle size of 2-5 microns.
(4) And (3) loading the outer layer material obtained in the step (1) and the inner layer material obtained in the step (2) into a rubber mold by using a special tool, wherein the loading amount ensures that the final thicknesses of the inner layer and the outer layer are respectively 8 mm, sealing, placing under the pressure of 180MPa for cold isostatic pressing for molding, painting the protective layer coating obtained in the step (3) on the outer surface of the tube blank after demolding, airing, and finally placing in a reducing atmosphere for roasting at 1100 ℃ for 3 hours.
Example 4: the method comprises the following steps:
(1) preparing an outer layer material: the composite material is characterized in that the outer layer material comprises the following components in parts by weight: 27% of silicon carbide particles with the particle size of 600-830 micrometers, 20% of magnesia stabilized capacitance zirconia with the particle size of 150-230 micrometers, 25% of silicon carbide powder with the particle size of 25-45 micrometers, 6% of aluminum nitride with the particle size of 0.5-2 micrometers, 14% of hexagonal boron nitride with the particle size of 2-5 micrometers and 8% of liquid silicone resin;
(2) preparing an inner layer material: the material is characterized in that the weight ratio of the inner layer material is as follows: 24% of silicon carbide particles with the particle size of 600-830 microns, 23% of silicon carbide powder with the particle size of 45-75 microns, 25% of crystalline flake graphite, 20% of aluminum oxide micro powder with the particle size of 1.5-3 microns and 8% of silicone resin;
(3) preparing a protective layer coating: the paint is characterized in that the paint protective layer comprises the following components in parts by weight: 65% of water, 5% of boric acid and 30% of silicon carbide micro powder with the particle size of 2-5 microns.
(4) And (3) loading the outer layer material obtained in the step (1) and the inner layer material obtained in the step (2) into a rubber mold by using a special tool, wherein the loading amount ensures that the final thicknesses of the inner layer and the outer layer are respectively 8 mm, sealing, placing under the pressure of 180MPa for cold isostatic pressing for molding, painting the protective layer coating obtained in the step (3) on the outer surface of the tube blank after demolding, airing, and finally placing in a reducing atmosphere for roasting at 1100 ℃ for 3 hours.
Example 5: the method comprises the following steps:
(1) preparing an outer layer material: the composite material is characterized in that the outer layer material comprises the following components in parts by weight: 30% of silicon carbide particles with the particle size of 600-830 micrometers, 15% of magnesia stabilized capacitance zirconia with the particle size of 150-230 micrometers, 25% of silicon carbide powder with the particle size of 25-45 micrometers, 7% of aluminum nitride with the particle size of 0.5-2 micrometers, 15% of hexagonal boron nitride with the particle size of 2-5 micrometers and 8% of liquid silicone resin;
(2) preparing an inner layer material: the material is characterized in that the weight ratio of the inner layer material is as follows: 25% of silicon carbide particles with the particle size of 600-830 microns, 22% of silicon carbide powder with the particle size of 45-75 microns, 25% of crystalline flake graphite, 20% of aluminum oxide micro powder with the particle size of 1.5-3 microns and 8% of silicone resin;
(3) preparing a protective layer coating: the paint is characterized in that the paint protective layer comprises the following components in parts by weight: 65% of water, 5% of boric acid and 30% of silicon carbide micro powder with the particle size of 2-5 microns.
(4) And (3) loading the outer layer material obtained in the step (1) and the inner layer material obtained in the step (2) into a rubber mold by using a special tool, wherein the loading amount ensures that the final thicknesses of the inner layer and the outer layer are respectively 8 mm, sealing, placing under the pressure of 180MPa for cold isostatic pressing for molding, painting the protective layer coating obtained in the step (3) on the outer surface of the tube blank after demolding, airing, and finally placing in a reducing atmosphere for roasting at 1100 ℃ for 3 hours.
The results of the above 5 examples and comparative examples for the production of molten steel for continuous casting in a tundish are summarized in the following table:
Figure 389797DEST_PATH_IMAGE002
in the table, comparative example 1 is a conventional tundish molten steel continuous temperature measuring tube made of alumina and graphite.
As shown in the table above, the molten steel corrosion resistance and the service life of the continuous temperature measurement protection tube for the molten steel tundish provided by the invention are obviously improved compared with those of conventional products, and meanwhile, the response time to the temperature is obviously shortened due to the fact that the wall thickness is thin and a high-temperature material with excellent heat conductivity is used.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, so that the equivalent changes or modifications of the structure, features and principles of the present invention by those skilled in the art should fall within the protection scope of the present invention.

Claims (1)

1. A manufacturing method of a tundish molten steel continuous temperature measuring pipe comprises the steps that the tundish molten steel continuous temperature measuring pipe is composed of an inner layer and an outer layer, and the thicknesses of the inner layer and the outer layer are 7-9 mm respectively; the manufacturing process comprises the following steps: the method comprises the following steps of (1) putting an outer layer material and an inner layer material into a rubber mold by using a special tool, sealing, placing the rubber mold under the pressure of 150-200 MPa for cold isostatic pressing for molding, painting a protective layer on the outer surface of a tube blank after demolding, drying the tube blank in the air, and finally placing the tube blank in a reducing atmosphere at 1050-1150 ℃ for roasting for 2.5-3 hours;
the composite material is characterized in that the outer layer material comprises the following components in parts by weight: 20-30% of silicon carbide particles with the particle size of 600-830 microns, 15-25% of magnesia stabilized capacitive zirconia with the particle size of 150-230 microns, 25-30% of silicon carbide powder with the particle size of 25-45 microns, 5-7% of aluminum nitride with the particle size of 0.5-2 microns, 10-15% of hexagonal boron nitride with the particle size of 2-5 microns and 8-12% of liquid silicone resin;
the weight ratio of the inner layer material is as follows: 15-25% of silicon carbide particles with the particle size of 600-830 microns, 20-30% of silicon carbide powder with the particle size of 45-75 microns, 15-25% of crystalline flake graphite, 15-35% of aluminum oxide micro powder with the particle size of 1.5-3 microns and 8-12% of silicone resin;
the coating protective layer comprises the following components in parts by weight: 60-70% of water, 4.5-5% of boric acid and 25-35% of silicon carbide micro powder with the particle size of 2-5 microns.
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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1238449A (en) * 1999-04-23 1999-12-15 清华大学 Thermocouple protection tube of boron nitride based composite ceramic material
CN1280670A (en) * 1997-11-28 2001-01-17 新特卡斯特有限公司 A Sampling device for thermal analysis
CN101118186A (en) * 2007-08-30 2008-02-06 聚光科技（杭州）有限公司 High-temperature continuously temperature measuring system and manufacturing method of temperature measurement pipe
CN101906225A (en) * 2009-06-04 2010-12-08 合肥杰事杰新材料有限公司 Thermal conductive high polymer material applied to pipes and preparation method thereof
CN101943607A (en) * 2010-08-31 2011-01-12 马鞍山钢铁股份有限公司 Inlaid type infrared temperature-measuring tube for continuous temperature measurement of liquid steel as well as components and preparation method thereof
DE102016011721A1 (en) * 2016-09-30 2018-04-05 Ralph Funck Process for producing thin-walled coatings on tubular fiber composite materials

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1280670A (en) * 1997-11-28 2001-01-17 新特卡斯特有限公司 A Sampling device for thermal analysis
CN1238449A (en) * 1999-04-23 1999-12-15 清华大学 Thermocouple protection tube of boron nitride based composite ceramic material
CN101118186A (en) * 2007-08-30 2008-02-06 聚光科技（杭州）有限公司 High-temperature continuously temperature measuring system and manufacturing method of temperature measurement pipe
CN101906225A (en) * 2009-06-04 2010-12-08 合肥杰事杰新材料有限公司 Thermal conductive high polymer material applied to pipes and preparation method thereof
CN101943607A (en) * 2010-08-31 2011-01-12 马鞍山钢铁股份有限公司 Inlaid type infrared temperature-measuring tube for continuous temperature measurement of liquid steel as well as components and preparation method thereof
DE102016011721A1 (en) * 2016-09-30 2018-04-05 Ralph Funck Process for producing thin-walled coatings on tubular fiber composite materials

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