CN114653933B - Production method for prolonging service life of billet continuous casting tundish - Google Patents
Production method for prolonging service life of billet continuous casting tundish Download PDFInfo
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- CN114653933B CN114653933B CN202210269640.7A CN202210269640A CN114653933B CN 114653933 B CN114653933 B CN 114653933B CN 202210269640 A CN202210269640 A CN 202210269640A CN 114653933 B CN114653933 B CN 114653933B
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- 238000009749 continuous casting Methods 0.000 title claims abstract description 25
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 20
- 239000000463 material Substances 0.000 claims abstract description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 12
- 230000008569 process Effects 0.000 claims abstract description 12
- 239000002893 slag Substances 0.000 claims abstract description 12
- 239000003381 stabilizer Substances 0.000 claims abstract description 8
- 239000012528 membrane Substances 0.000 claims abstract description 6
- 239000002737 fuel gas Substances 0.000 claims abstract description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 20
- 239000007789 gas Substances 0.000 claims description 18
- 239000003345 natural gas Substances 0.000 claims description 10
- 239000011819 refractory material Substances 0.000 claims description 8
- 239000000126 substance Substances 0.000 claims description 5
- 230000000704 physical effect Effects 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 238000009472 formulation Methods 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 claims 1
- 238000005266 casting Methods 0.000 abstract description 5
- 229910000831 Steel Inorganic materials 0.000 description 11
- 239000010959 steel Substances 0.000 description 11
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical group [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 238000005245 sintering Methods 0.000 description 4
- 230000003628 erosive effect Effects 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/005—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like with heating or cooling means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/02—Linings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/50—Pouring-nozzles
- B22D41/52—Manufacturing or repairing thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/50—Pouring-nozzles
- B22D41/60—Pouring-nozzles with heating or cooling means
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/03—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite
- C04B35/04—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite based on magnesium oxide
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
- C04B2235/3208—Calcium oxide or oxide-forming salts thereof, e.g. lime
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3418—Silicon oxide, silicic acids, or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/74—Physical characteristics
- C04B2235/77—Density
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/10—Reduction of greenhouse gas [GHG] emissions
- Y02P10/143—Reduction of greenhouse gas [GHG] emissions of methane [CH4]
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Ceramic Products (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
Abstract
The invention discloses a production method for prolonging the service life of a billet continuous casting tundish, which comprises the following steps: optimizing a tundish refractory baking curve; in the process of baking the tundish, a lower air suction device is added; the heat value of knotted baked fuel gas of the tundish working layer is improved; changing the middle split type current stabilizer into an integral type; changing the small tire membrane at the upper water gap of the tundish working layer into a cone shape with thick upper part and thin lower part; the tundish dry material is changed into slag line material. According to the invention, the tundish interception problem caused by the tundish material resistance problem is reduced by optimizing the tundish material resistance baking curve, so that the production efficiency and the casting blank quality of the continuous casting machine can be effectively improved, and the production running cost and consumption are reduced.
Description
Technical Field
The invention relates to the technical field of smelting, in particular to a production method for prolonging the service life of a billet continuous casting tundish.
Background
For continuous casting production, the improvement of the operation rate of a continuous casting machine means the improvement of yield increase benefit, and the high-efficiency continuous casting technology is based on high-drawing speed and high-quality defect-free casting blank production, so that the development of the high-efficiency continuous casting technology becomes the main direction for exerting the potential of the continuous casting technology, is highly valued by major iron and steel enterprises, engineering companies and equipment manufacturers in the world, and has very wide development prospect.
The continuous casting time of the tundish is prolonged, so that the number of continuous casting furnaces of the tundish can be increased, the downtime of a continuous casting machine is further reduced, the yield is increased, the consumption of steel materials, the consumption of energy media and the cost of ton steel refractory materials can be reduced, and the use benefit of the tundish is maximized. However, in the actual production process, the factors limiting the high-efficiency production of continuous casting are many, wherein the quality and the service life of a tundish of a continuous casting machine are one of the factors, the quality of the existing tundish is poor, the quality of molten steel is seriously polluted, the quality of a steel billet is also reduced, the service life of the tundish also severely limits the number of continuous casting furnaces, the yield of molten steel is reduced, and the number of continuous casting furnaces of the continuous casting machine is also reduced.
Disclosure of Invention
The invention aims to provide a production method for effectively improving the production efficiency and the casting blank quality of a continuous casting machine, reducing the production running cost and the consumption and prolonging the service life of a billet continuous casting tundish.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: a production method for prolonging service life of a billet continuous casting tundish comprises the following steps:
optimizing a tundish refractory baking curve;
in the process of baking the tundish, a lower air suction device is added;
the heat value of knotted baked fuel gas of the tundish working layer is improved;
changing the middle split type current stabilizer into an integral type;
changing the small tire membrane at the upper water gap of the tundish working layer into a cone shape with thick upper part and thin lower part;
the tundish dry material is changed into slag line material.
Preferably, the specific steps for optimizing the bakeout resistance material baking curve are as follows: changing the baking mode of the tundish refractory material into the baking mode of small fire, medium fire and large fire, and making a baking temperature curve.
Preferably, the baking temperature curve formulation rule is as follows: the normal baking ladle is kept with small fire for 1.5 hours, the gas valve is fully opened, the opening degree of the fan valve is 1/4, and the baking temperature of the tundish reaches 600 ℃;
then adjusting the middle fire for 1 hour, fully opening a gas valve, and enabling the opening degree of a fan valve to be 1/2, wherein the baking temperature of the tundish reaches 900 ℃;
and finally, regulating the fire for 1.5 hours, fully opening a gas valve, fully opening a fan valve, baking the bag for 4 hours, and measuring the baking temperature of the middle bag by post workers if the baking temperature is less than 900 ℃, preparing natural gas, and opening the natural gas valve for 1/4 until the middle bag is poured.
Preferably, in the process of baking the tundish, the specific steps of adding the lower air suction device are as follows: in the later baking stage of the tundish, a lower air suction device is additionally used, heat in the tundish is sucked down by utilizing negative pressure generated by compressed air flow, and the lower air suction device is a negative pressure fan.
Preferably, the specific steps of increasing the calorific value of the knotted baked gas of the tundish working layer are: the gas baked by the tundish is changed into natural gas, so that the baking temperature of the knotting process of the tundish is improved.
Preferably, the slag line comprises the following chemical components: mgO:66-73%, caO:1-3%, siO2:3-6%, al2O3:6-10%, and the balance of unavoidable impurities.
Preferably, the physical properties of the slag line are: bulk density: not less than 2.1g/cm3, flexural strength: not less than 2.0MPa, compressive strength: and is more than or equal to 4.0MPa.
Preferably, the lower air suction device is arranged in a lower sliding block of the middle bag.
Compared with the prior art, the invention has the advantages that:
according to the invention, the tundish interception problem caused by the tundish material resistance problem is reduced by optimizing the tundish material resistance baking curve, so that the production efficiency and the casting blank quality of the continuous casting machine can be effectively improved, and the production running cost and consumption are reduced.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a graph showing the baking temperature in example 1 of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making clear and defining the scope of the present invention.
The invention provides a production method for prolonging the service life of a billet continuous casting tundish, which comprises the following steps:
(1) The baking mode of the tundish refractory material is changed into a baking mode of small fire, medium fire and big fire, and a specific baking temperature curve is formulated at the same time, so that the baking quality of the tundish is improved;
(2) In the later baking stage of the tundish, a lower air suction device is additionally used, and the heat in the tundish is sucked by utilizing the negative pressure generated by compressed air flow, so that the purpose of baking the zirconium core of the upper water gap of the tundish is achieved, and the use effect of the upper water gap of the tundish is improved;
(3) Changing the gas baked by the tundish into natural gas, improving the baking temperature of the knotting process of the tundish, wherein the knotting baking time of the tundish after transformation is about 3 hours, and the sintering thickness of the working layer is 30-35 mm from 10-15 mm;
(4) Changing the small tire membrane of the upper water gap of the working layer of the tundish into a cone shape with thick upper part and thin lower part, and avoiding falling off and falling off of the working layer of the bowl part of the upper water gap;
(5) The tundish current stabilizer is changed into an integral type from a split current stabilizer, so that the erosion resistance of the refractory is improved;
(6) The tundish dry material is changed from the former ladle bottom material, ladle wall material and slag line material into the slag line material, so that the anti-erosion capability of the tundish bottom is provided, and the falling-off of the refractory material is reduced.
Example 1
Changing the baking mode of the tundish refractory material into a baking mode of small fire, medium fire and big fire, and simultaneously making a specific baking temperature curve as shown in the following figure 1;
the normal baking ladle is kept at a low fire (200-600 ℃) for 1.5 hours, a gas valve is fully opened, the opening degree of a fan valve is 1/4, and the baking temperature of a tundish reaches 600 ℃; then adjusting the middle fire (600-900 ℃) for 1 hour, fully opening a gas valve, and enabling the opening degree of a fan valve to be 1/2, wherein the baking temperature of the tundish reaches 900 ℃; and finally, regulating the fire (900-1100 ℃) for 1.5 hours, fully opening a gas valve, fully opening a fan valve, baking the bag for 4 hours, and if the baking temperature of the middle bag measured by post workers is less than 900 ℃, preparing natural gas, and opening the natural gas valve for 1/4 until the middle bag is opened for casting. The baked tundish is directly put into use, and if the baking time needs to be prolonged due to the problems of production organization and the like, the temperature should be kept from being reduced and the fire should be stopped during the baking period of big fire.
Example 2
In order to reduce the phenomenon that the zirconium core at the water inlet of the tundish is cracked due to the fact that the zirconium core at the water inlet of the tundish is not baked in place, the temperature is low, the thermal shock resistance of molten steel is poor after pouring, and the zirconium core falls off at the crack along with the flushing of molten steel in the pouring process. And in the later baking stage of the tundish, the negative pressure fan is arranged on the lower slide block of the tundish, compressed air is filled, and the heat in the tundish is sucked down by utilizing the negative pressure generated by the compressed air flow, so that the purpose of baking the zirconium core of the upper nozzle of the tundish is achieved, and the use effect of the upper nozzle of the tundish is improved.
Example 3
In the knotting and baking process of the tundish working layer, converter gas is used for baking in the early stage, the thickness of a sintering layer of the tundish working layer is 10-15 mm due to lower heat value of the gas, the baking time is 8 hours, if the heat value of the converter gas is low, the baking time is as long as 10 hours, the knotting quality of the dry material is obviously reduced due to low baking temperature, and the sintering strength is reduced. In the use process, the molten steel scouring resistance is reduced, and particularly, after the dry material at the bottom of the ladle is washed by high-temperature molten steel, the dry material enters the crystallizer through the water inlet of the tundish, so that the fluctuation and interception of the liquid level of the tundish are caused. Aiming at the situation, the gas baked by the tundish is changed into natural gas, the baking temperature of the knotting process of the tundish is improved, the knotting baking time of the tundish after transformation is about 3 hours, and the sintering thickness of the working layer is up to 30-35 mm from 10-15 mm.
Example 4
The small tire membrane of the upper water gap of the tundish working layer is improved, the angle sum height of the small tire membrane is enlarged, the strength of the bowl part of the upper water gap of the tundish after knotting is ensured, and falling of the working layer of the bowl part of the upper water gap are avoided.
Example 5
In the later stage of use, the connection weakness among all parts is easy to be eroded by molten steel and not eroded, so that the erosion of a guard plate and the current stabilizer is aggravated, the split current stabilizer is changed into an integral type, the installation gap between the guard plate and the current stabilizer is eliminated, and the erosion resistance of the integral refractory is obviously improved.
Example 6
The tundish dry material is changed from the former ladle bottom material, ladle wall material and slag line material into the slag line material, so that the anti-erosion capability of the tundish bottom is provided, and the falling-off of the refractory material is reduced.
The physical and chemical indexes of the tundish bottom material and the wall material before improvement are as follows:
the chemical components are as follows: mgO:42-47%, siO2:40-45%, al2O3:6-10%;
physical properties: bulk density: not less than 1.9g/cm3, flexural strength: not less than 0.5MPa, compressive strength: and is more than or equal to 1.0MPa.
Slag wires are used for the improved tundish dry material, and the physicochemical indexes are as follows:
the chemical components are as follows: mgO:66-73%, caO:1-3%, siO2:3-6%, al2O3:6-10%, and the balance of unavoidable impurities;
physical properties: bulk density: not less than 2.1g/cm3, flexural strength: not less than 2.0MPa, compressive strength: and is more than or equal to 4.0MPa.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, the patentees may make various modifications or alterations within the scope of the appended claims, and are intended to be within the scope of the invention as described in the claims.
Claims (2)
1. The production method for prolonging the service life of the billet continuous casting tundish is characterized by comprising the following steps of:
optimizing a tundish refractory baking curve;
in the process of baking the tundish, a lower air suction device is added;
the heat value of knotted baked fuel gas of the tundish working layer is improved;
changing the middle split type current stabilizer into an integral type;
changing the small tire membrane at the upper water gap of the tundish working layer into a cone shape with thick upper part and thin lower part;
changing the tundish dry material into slag line material;
the specific steps of optimizing the baking curve of the tundish refractory material are as follows: changing the baking mode of the tundish refractory material into a baking mode of small fire, medium fire and big fire, and making a baking temperature curve;
the baking temperature curve formulation rule is as follows: the normal baking ladle is kept with small fire for 1.5 hours, the gas valve is fully opened, the opening degree of the fan valve is 1/4, and the baking temperature of the tundish reaches 600 ℃;
then adjusting the middle fire for 1 hour, fully opening a gas valve, and enabling the opening degree of a fan valve to be 1/2, wherein the baking temperature of the tundish reaches 900 ℃;
finally, regulating the fire for 1.5 hours, fully opening a gas valve, fully opening a fan valve, baking a bag for 4 hours, measuring the baking temperature of the middle bag by post workers if the baking temperature is less than 900 ℃, preparing natural gas, and opening the natural gas valve for 1/4 until the middle bag is poured;
in the process of baking the tundish, the specific steps of adding a lower air suction device are as follows: in the later baking stage of the tundish, a lower air suction device is additionally used, and the heat in the tundish is sucked down by utilizing the negative pressure generated by compressed air flow, wherein the lower air suction device is a negative pressure fan;
the specific steps of improving the heating value of the knotted baked gas of the tundish working layer are as follows: changing the gas baked by the tundish into natural gas, and improving the baking temperature of the knotting process of the tundish;
the lower air suction device is arranged in a lower sliding block of the middle bag;
the slag line comprises the following chemical components: mgO:66-73%, caO:1-3%, siO2:3-6%, al2O3:6-10%, and the balance of unavoidable impurities.
2. The production method for prolonging the service life of the billet continuous casting tundish according to claim 1, which is characterized by comprising the following steps of: the physical properties of the slag line material are as follows: bulk density: not less than 2.1g/cm3, flexural strength: not less than 2.0MPa, compressive strength: and is more than or equal to 4.0MPa.
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102699316A (en) * | 2012-05-10 | 2012-10-03 | 莱芜钢铁集团有限公司 | Beam blank continuous casting machine tundish working lining, construction tire film of working lining and preparation method of working lining |
| CN103791721A (en) * | 2014-02-13 | 2014-05-14 | 山西太钢不锈钢股份有限公司 | Thermal test method of medium-frequency induction furnace |
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