CN105983684B - A kind of submersed nozzle containing hole body in low-carbon - Google Patents
A kind of submersed nozzle containing hole body in low-carbon Download PDFInfo
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- CN105983684B CN105983684B CN201510097585.8A CN201510097585A CN105983684B CN 105983684 B CN105983684 B CN 105983684B CN 201510097585 A CN201510097585 A CN 201510097585A CN 105983684 B CN105983684 B CN 105983684B
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Abstract
The present invention relates to a kind of submersed nozzles containing hole body in low-carbon for calcium treated steel continuous casting.A kind of submersed nozzle containing hole body in low-carbon, including interior hole body, ontology and slag line section, the material of the interior hole body is Al2O3C or Al2O3Spinel C or Spinel C or MgO C, C content 6 12%, SiO2Content is less than 5%.The ontology material is Al2O3C, C content are more than or equal to 20%；The slag line section material is ZrO2C, ZrO2Content is more than or equal to 73%.The submersed nozzle of the present invention not only has good corrosion resistance, it may have good thermal shock resistance can meet the requirement of calcium treated steel continuous casting.
Description
Technical field
The present invention relates to submersed nozzles, more particularly, to a kind of immersion containing hole body in low-carbon of calcium treated steel continuous casting
The formula mouth of a river.
Background technology
Submersed nozzle is continuous casting key function refractory material, and be also liquid molten steel solidification before by the last one
Functional refractory, therefore the quality of submersed nozzle directly influences the quality of molten steel and strand.For a long time, scientific and technical personnel
Numerous studies are carried out to the material, performance and structure of submersed nozzle, the performance and structure of submersed nozzle have obtained very greatly
It improves, can preferably meet the needs of steel-making continuous casting.
Existing submersed nozzle generally uses Al2O3- C materials, carbon content about 20% or more, slag line use ZrO2- C materials
Matter, ZrO2 About 72% or more.Since nozzle clogging situation is more, to prevent nozzle clogging and blocking, the material and structure at the mouth of a river from obtaining
Development is arrived.Japanology shows that the carbon-free interior hole body material without silicon of use can mitigate nozzle clogging, so later containing interior
The hole body mouth of a river largely uses.But interior hole body material is difficult that balance is obtained between corrosion resistance and thermal shock resistance, carbon-free, without silicon
Although anti-dross is pretty good for interior hole body material, but thermal shock resistance is insufficient；In order to improve the thermal shock resistance of interior hole body material, some endoporus
Body adds zirconium mullite, although thermal shock resistance is improved, anti-dross, corrosion resistance are bad；Some interior hole bodies add
Spinelle, but thermal shock resistance is inadequate.
With the development need that continuous casting process and various variety steels are cast, quality and adaptability to submersed nozzle propose
Increasingly higher demands.For example, requirement of the different steel grades to submersed nozzle is different, for aluminum killed steel, it is desirable that immersion
The mouth of a river has good anti-clogging ability；For high-oxygen steel, it is desirable that the three-major-items such as submersed nozzle have good corrosion resistance；
For slab calcium treated steel, not requiring nothing more than submersed nozzle has good erosion resisting, and reduces the mouth of a river as far as possible to casting
The influence of base inclusion defect.
Without the endoporus mouth of a river, material is the Al of carbon content about 25%2O3C-material, thermal coefficient are high, after baking to before opening and pour
The cooling at the mouth of a river is big than the mouth of a river containing endoporus, in this way, open pour after the thermal stress that is subject to it is also larger, the possibility that the mouth of a river is broken compared with
It is high.Containing the interior hole body mouth of a river due to the low heat conductivity of interior hole body, the temperature drop at the mouth of a river is smaller, and thermal shock resistance is better than without the interior hole body mouth of a river.
Also have at present using without interior hole body submersed nozzle（Original submersed nozzle is all without interior hole body）.In order to ensure without interior hole body
The thermal shock resistance at the mouth of a river, often adding some improves the substance of thermal shock resistance, such as vitreous silica, zirconium mullite and boron glass
Deng.These substances contain higher SiO2, reduce the corrosion resistance at the mouth of a river.Therefore, there is presently no can meet at calcium very well
Manage the submersed nozzle that steel continuous casting requires.
Existing literature and patent analysis.China " refractory material " 2012, No.5 is reported, to prevent alumina clogging and improvement
Resistance to flaking, Japanology develop the carbon-free liner of long nozzle and submersed nozzle.To spinelle（MgO27%）And SiO2It is different
Al2O3-SiO2Material is studied.By SiO2The Al of content 33%2O3-SiO2Carbon-free material is as long nozzle and immersion
The liner at the mouth of a river is applied, and using effect is good.Japan " refractory material " 2002, No.3 reports, Japanese Ceramic Corporation of Toshiba
Develop Al2O3-MgO（Al2O3：82%；MgO：6%）Submersed nozzle inner lining material.This material generates two hypocones crystalline substance when heated
Stone and keep material fine and close, erosion resisting is Al2O31.38 times of C-material.Japan " refractory material " 1996, No.7 is reported, it is contemplated that
When the Ca-Si that casts handles steel, because of the Al in refractory material2O3It is reacted with the CaO in molten steel and generates eutectic and corrode increase,
Developmental research Ca-Si handles steel MgO-C submersed nozzle.The MgO 68% of development, C 25%, and it is original
Al2O3C-material, which is compared, improves erosion resisting.
Chinese patent CN201572914U discloses a kind of aluminium zirconium carbonaceous and exempts to toast submersed nozzle, ontology, slag at the mouth of a river
One layer of carbon-free material is covered on line inner wall, carbon-free material can be any one of zirconium matter, corundum, spinelle, quartziferous.
Since the entire endoporus of submersed nozzle is all carbon-free material, the thermal conductivity of material is relatively low, extends thickness of SEN direction temperature
The time of transmission, can avoid temperature change dramatically in steel pouring process makes the mouth of a river crack, which is not required to before use
It toasts.Chinese patent CN102335730A discloses a kind of Silicone-free submersed nozzle, in order to ensure the mouth of a river
Thermal shock resistance, certain aluminium titanates is added in ontology and slag line, in the condition for not influencing mouth of a river thermal shock resistance and service life
Under, slowed down by way of preventing SiO from generating or prevent the generation of dross, prevents nozzle blocking.Japan Patent WO2012/
132562 disclose a kind of immersion water gap for continuously casting, and the patent is in the discharge hole of submersed nozzle, and per side, design is spat for 2 up and down
Portal.Such design, molten steel form double-cyclone in the vertical direction of crystallizer, make upper and lower steel stream speed control in certain model
It encloses, to improve slab quality.
Existing literature and patent be all not involved with about submersed nozzle setting low-carbon in hole body, take into account corrosion resistance and
The content of thermal shock resistance.
Invention content
The purpose of the present invention is to provide a kind of submersed nozzle containing hole body in low-carbon, which not only has
Good corrosion resistance, it may have good thermal shock resistance can meet the requirement of calcium treated steel continuous casting.
In order to achieve the above technical purposes, the present invention adopts the following technical scheme that：
According to the erosion mechanism at the calcium treated steel mouth of a river, the CaO ingredients in steel can not change, Al2O3A part is from molten steel
Deoxidation products, a part come from nozzle material, cannot also change substantially, present invention employs reduce or remove in interior hole body material
SiO2Ingredient is corroded with reducing the generation of low melting point phase and reducing, while preferable according to the thermal shock resistance containing the interior hole body mouth of a river
Feature changes the ingredient of interior hole body material, it is made to take into account corrosion resistance and thermal shock resistance.Submersed nozzle of the invention in this way is not
Only there is good corrosion resistance, it may have good thermal shock resistance can meet the requirement of calcium treated steel continuous casting.
A kind of submersed nozzle containing hole body in low-carbon, including interior hole body, ontology and slag line section, the material of the interior hole body
It is Al2O3- C or Al2O3- spinel-C or Spinel-C or MgO-C, C content 6-12%, SiO2Content is less than 5%.
The ontology material is Al2O3- C, C content are more than or equal to 20%；The slag line section material is ZrO2- C, ZrO2Content
More than or equal to 73%.
Further, the Al2O3The Al of hole body in-C2O3Content is more than 75%.
Further, the Al2O3The Al of hole body in-spinel-C2O3Content is more than 45%, spinelle（spinel）Content
15-30%。
Further, the spinelle content of hole body is more than 75% in the Spinel-C.
Further, the content of MgO of hole body is more than 75% in the MgO-C.
Further, the endoporus body thickness is 5-8mm.
The present invention proposes on the basis of mouth of a river erosion condition in having studied existing calcium treated steel casting process.
Studies have shown that when calcium treated steel continuous casting, the Al in submersed nozzle in hole body material2O3（Deoxidation production including molten steel
Object Al2O3）、SiO2It acts on forming submellite low melting point phase with the CaO in calcium treated steel, causes the mouth of a river to corrode, with the mouth of a river
It corrodes, interior hole body becomes loose porous, and a large amount of molten steels are penetrated into, and accelerates mouth of a river erosion.The mouth of a river containing hole body in zirconium mullite,
SiO2Content is higher, cast calcium treated steel when can form 2CaOAl2O3·SiO2（Gai Yellow feldspars）Low melting point phase（Fusing point 1590
℃）, cause interior hole body to corrode more.
According to the erosion mechanism at the calcium treated steel mouth of a river, the CaO ingredients in steel can not change, Al2O3A part is from molten steel
Deoxidation products, a part come from nozzle material, cannot also change substantially, and only way is to reduce or remove in interior hole body material
SiO2Ingredient is corroded with reducing the generation of low melting point phase and reducing, while preferable according to the thermal shock resistance containing the interior hole body mouth of a river
Feature proposes the submersed nozzle containing hole body in low-carbon of the present invention.
The present invention, which uses, contains interior hole body submersed nozzle, has the characteristics that preferable thermal shock resistance using containing the interior hole body mouth of a river,
The ingredient of hole body material, makes it take into account corrosion resistance and thermal shock resistance in changing.The present invention is using hole body in low-carbon matter, carbon content
6-12%, if carbon content is less than 6%, the thermal shock resistance of interior hole body material is inadequate, if carbon content is more than 12%, interior hole body
The thermal coefficient of material increases, unfavorable to the thermal shock resistance at the mouth of a river.Because calcium treated steel does not abstain from that carbon, certain carbon content can be true
The thermal shock resistance of hole body in protecting.SiO2Content control is 5% hereinafter, with the erosion of hole body in reduction and to the influence of slab quality.
The material of interior hole body uses Al2O3- C, Al2O3- spinel-C, Spinel-C or MgO-C.Al2O3The Al of hole body in-C2O3Content
More than 75%.Al2O3The Al of hole body in-spinel-C2O3Content is more than 45%, spinelle（spinel）Content 15-30%.
The spinelle content of hole body is more than 75% in Spinel-C.The content of MgO of hole body is more than 75% in MgO-C.Endoporus body thickness 5-
8mm.Such interior hole body has the ability of good Ca treated steel resistance, meanwhile, and the thermal shock resistance at the mouth of a river can be improved, subtract
Few mouth of a river fracture accident.Because having good corrosion resistance, the flaw detection disqualification rate of plate product can be controlled in reduced levels.
Bulk material of the present invention containing the submersed nozzle of hole body in low-carbon uses Al2O3- C matter, 20% or more C content are
The thermal shock resistance for improving ontology, is added certain zirconium mullite.Slag line section is using conventional ZrO2- C matter, ZrO2Content 73% with
On.
The technique effect of the present invention：
The Al containing low-carbon of the present invention2O3- C, Al2O3The immersion water of hole body in-spinel-C, Spinel-C or MgO-C
Mouthful, the ability with good Ca treated steel resistance, meanwhile, and can ensure that the thermal shock resistance at the mouth of a river, mouth of a river fracture can be reduced
Accident.Because having good corrosion resistance, the flaw detection disqualification rate for being conducive to plate product is controlled in reduced levels.
Description of the drawings
Fig. 1 is the immersion type water nozzle structure schematic diagram containing interior hole body；
In figure：Hole body in 1,2 ontologies, 3 slag lines.
Specific implementation mode
The invention will be further described in the following with reference to the drawings and specific embodiments.
Referring to Fig. 1, the submersed nozzle manufacturing process of the invention containing hole body in low-carbon contains interior hole body immersion with existing
The technique at the mouth of a river is identical.A kind of submersed nozzle containing hole body in low-carbon, including interior hole body 1, ontology 2 and slag line section 3.
The Composition Control of hole body material and it is shown in Table 2, table 3 with the comparison of current material in the mouth of a river of the present invention.
Ontology material of the present invention is Al2O3- C, C content are more than or equal to 20%；Slag line section material is ZrO2- C, ZrO2Content is big
In equal to 73%.The specific proportioning of mouth of a river ontology and slag line is as shown in table 1.
The proportioning of table 1 mouth of a river ontology and slag line（wt%）
From table 2 it can be seen that example A1-A4, although the bulk composition of interior hole body material is varied from, but as long as keeping
6% or more low carbon content and 5% SiO below2Content, so that it may take into account corrosion resistance and thermal shock resistance.And comparative example B1 although
Contain ZrO2, due to SiO2Content is more, and corrosion resistance is bad.For comparative example B2 because carbon content is less, thermal shock resistance is insufficient, interior
Hole body is easy to happen cracking and even peels off.
Table 2
Table 3
In above-mentioned table 3, example A5-A8, Main change SiO2With the content of C, SiO is controlled25% hereinafter, at C content
Between 6-12%, corrosion resistance and thermal shock resistance can be taken into account.The SiO of comparative example B32Content is more, and corrosion resistance is caused to decline.
The C content of B4 is higher, and the thermal coefficient of interior hole body is high, and especially winter, the heat spreader at the mouth of a river is very fast, the thermal shock resistance at the mouth of a river
It reduces.
Claims (6)
1. a kind of submersed nozzle containing hole body in low-carbon, including interior hole body, ontology and slag line section, it is characterized in that：The endoporus
The material of body is Al2O3- C or Al2O3- spinel-C or Spinel-C or MgO-C, C content 6-7%, SiO2Content be more than etc.
In 2.5%, it is less than 5%；
The ontology material is Al2O3- C, C content are more than or equal to 20%；
The slag line section material is ZrO2- C, ZrO2Content is more than or equal to 73%.
2. the submersed nozzle according to claim 1 containing hole body in low-carbon, it is characterized in that：The Al2O3Hole body in-C
Al2O3Content is more than 75%.
3. the submersed nozzle according to claim 1 containing hole body in low-carbon, it is characterized in that：The Al2O3-spinel-C
The Al of interior hole body2O3Content is more than 45%, spinelle（spinel）Content 15-30%.
4. the submersed nozzle according to claim 1 containing hole body in low-carbon, it is characterized in that：Hole body in the Spinel-C
Spinelle content be more than 75%.
5. the submersed nozzle according to claim 1 containing hole body in low-carbon, it is characterized in that：Hole body in the MgO-C
Content of MgO is more than 75%.
6. the submersed nozzle according to claim 1 containing hole body in low-carbon, it is characterized in that：The endoporus body thickness is 5-
8mm。
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| CN201510097585.8A CN105983684B (en) | 2015-03-05 | 2015-03-05 | A kind of submersed nozzle containing hole body in low-carbon |
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| CN105983684B true CN105983684B (en) | 2018-10-02 |
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| CN113458377A (en) * | 2020-03-30 | 2021-10-01 | 宝山钢铁股份有限公司 | Anti-caking tundish breathable water feeding port |
| CN113523262B (en) * | 2020-04-17 | 2022-10-21 | 宝山钢铁股份有限公司 | Anti-blocking immersion water gap |
| CN115246742B (en) * | 2021-04-28 | 2023-09-12 | 宝山钢铁股份有限公司 | Long nozzle for high oxygen steel continuous casting |
| CN113560514A (en) * | 2021-06-29 | 2021-10-29 | 江苏沙钢集团有限公司 | Method for controlling surface cracks of bridge steel slab |
| CN114292117A (en) * | 2022-01-27 | 2022-04-08 | 无锡市南方耐材有限公司 | Continuous casting three major pieces for high-performance steel of tundish and preparation method thereof |
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