CN105983684A - Low-carbon inner hole body-contained submersed nozzle - Google Patents
Low-carbon inner hole body-contained submersed nozzle Download PDFInfo
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Abstract
The invention relates to a low-carbon inner hole body-contained submersed nozzle for calcium treatment steel continuous casting. The low-carbon inner hole body-contained submersed nozzle comprises an inner hole body, a main body and a slag line section; the inner hole body adopts a material of Al2O3-C, or Al2O3-spinel-C, or Spinel-C, or MgO-C; C is 6-12%; and SiO2 is less than 5%. The main body adopts a material of Al2O3-C; C is not less than 20%; the slag line section adopts a material of ZrO2-C; and ZrO2 is not less than 73%. The submersed nozzle is excellent in erosion resistance and thermal shock resistance, and can satisfy the requirements of calcium treatment steel continuous casting.
Description
Technical field
The present invention relates to submersed nozzle, a kind of containing the submersed nozzle of hole body in low-carbon (LC) particularly for calcium treated steel continuous casting.
Background technology
Submersed nozzle is continuous casting key function refractory material, and is last functional refractory passed through before liquid molten steel solidification, and therefore the quality of submersed nozzle directly influences the quality of molten steel and strand.For a long time, scientific and technical personnel have carried out numerous studies to material, performance and the structure of submersed nozzle, and performance and the structure of submersed nozzle have obtained significant improvement, can preferably meet the needs of steel-making continuous casting.
Existing submersed nozzle, commonly used Al2O3-C material, carbon content about more than 20%, slag line uses ZrO2-C material, ZrO2 About more than 72%.Owing to nozzle clogging situation is more, for preventing nozzle clogging and blocking, material and the structure at the mouth of a river are developed.Japanology shows, uses interior hole body material carbon-free, without silicon can alleviate nozzle clogging, so using in a large number containing the interior hole body mouth of a river later.But interior hole body material is difficult between corrosion resistance and thermal shock resistance obtain balance, though carbon-free, pretty good without the interior anti-dross of hole body material of silicon, thermal shock resistance is not enough；In order to improve the thermal shock resistance of interior hole body material, in some, hole body adds zirconium mullite, although thermal shock resistance is improved, but anti-dross, corrosion resistance are bad；In some, hole body adds spinelle, but thermal shock resistance is inadequate.
The development need cast along with continuous casting process and various variety steel, quality and adaptability to submersed nozzle propose the highest requirement.Such as, different steel grades are different, for aluminum killed steel, it is desirable to submersed nozzle has good blockage resisting ability to the requirement of submersed nozzle；For high-oxygen steel, it is desirable to the three-major-items such as submersed nozzle have good corrosion resistance；For slab calcium treated steel, do not require nothing more than submersed nozzle and there is good erosion resisting, and reduce the mouth of a river impact on strand inclusion defect as far as possible.
The mouth of a river without endoporus, its material is the Al of carbon content about 25%2O3-C-material, heat conductivity is high, bigger than the mouth of a river containing endoporus to opening the cooling watering the front mouth of a river after baking, so, opens and waters rear thermal stress the most greatly, and the probability of mouth of a river fracture is higher.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 less, and thermal shock resistance is better than without the interior hole body mouth of a river.Currently also there is employing without interior hole body submersed nozzle (original submersed nozzle does not all have interior hole body).In order to ensure the thermal shock resistance without the interior hole body mouth of a river, often add some materials improving thermal shock resistance, such as vitreous silica, zirconium mullite and boron glass etc..These materials contain higher SiO2, reduce the corrosion resistance at the mouth of a river.Therefore, there is presently no and can meet the submersed nozzle of calcium treated steel continuous casting requirement very well.
Existing document and patent analysis.China's " refractory material " 2012, No.5 reports, for preventing alumina clogging and improving resistance to flaking, Japanology develops the carbon-free liner of long nozzle and submersed nozzle.To spinelle (MgO27%) and SiO2Different Al2O3-SiO2Material is studied.By SiO2The Al of content 33%2O3-SiO2Carbon-free material is applied as the liner of long nozzle and submersed nozzle, and using effect is good.Japan's " refractory body " 2002, No.3 reports, Ceramic Corporation of Toshiba of Japan develops Al2O3-MgO(Al2O3: 82%；MgO:6%) submersed nozzle inner lining material.Generating secondary spinel when this material is heated and make material fine and close, erosion resisting is Al2O31.38 times of-C-material.Japan's " refractory body " 1996, No.7 reports, it is contemplated that when the Ca-Si that casts processes steel, because of the Al in refractory material2O3Reacting generation eutectic with the CaO in molten steel and corrode increase, developmental research Ca-Si processes steel MgO-C submersed nozzle.The MgO 68% of development, C 25%, with original Al2O3-C-material is compared and is improved erosion resisting.
Chinese patent CN201572914U discloses a kind of aluminum zirconium carbonaceous and exempts to toast submersed nozzle, covers one layer of carbon-free material on mouth of a river body, slag line inwall, and carbon-free material can be any one of zirconium matter, corundum, spinelle, quartziferous.Owing to the whole endoporus of submersed nozzle is all carbon-free material, the thermal conductivity of material is relatively low, extends the time of thickness of SEN direction temperature transfer, temperature in steel pouring process can be avoided drastically to change and make the mouth of a river ftracture, and this invention mouth of a river need not baking before use.Chinese patent CN102335730A discloses a kind of Silicone-free submersed nozzle, thermal shock resistance in order to ensure the mouth of a river, certain aluminium titanates is added at body and slag line, do not affecting mouth of a river thermal shock resistance and under conditions of service life, by the way of preventing SiO generation, slow down or stop the generation of dross, prevention of immersed nozzle clogging.Japan Patent WO2012/132562 discloses a kind of immersion water gap for continuously casting, and this patent is in the discharge hole of submersed nozzle, and upper and lower 2 discharge holes are designed on every limit.Such design, molten steel forms double-cyclone in the vertical direction of crystallizer, makes upper and lower steel Flow Velocity control in certain limit, thus improve slab quality.
Existing document and patent are all not involved with arranging hole body in low-carbon (LC) about submersed nozzle, taking into account the content of corrosion resistance and thermal shock resistance.
Summary of the invention
It is an object of the invention to provide a kind of containing the submersed nozzle of hole body in low-carbon (LC), this submersed nozzle 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 realize above-mentioned technical purpose, 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 composition in steel cannot change, Al2O3A part, can not change from the deoxidation products of molten steel, a part the most substantially from nozzle material, present invention employs minimizing or removes the SiO in interior hole body material2Composition, to reduce the generation of low melting point phase and to reduce erosion, basis is containing the interior hole body mouth of a river preferable feature of thermal shock resistance simultaneously, the composition of hole body material in changing so that it is take into account corrosion resistance and thermal shock resistance.So 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.
A kind of containing the submersed nozzle of hole body in low-carbon (LC), including interior hole body, body and slag line section, the material of described interior hole body is Al2O3-C, or Al2O3-spinel-C, or Spinel-C, or MgO-C, C content 6-12%, SiO2Content is less than 5%.
Described body material is Al2O3-C, C content is more than or equal to 20%；Described slag line section material is ZrO2-C, ZrO2Content is more than or equal to 73%.
Further, described Al2O3The Al of hole body in-C2O3Content is more than 75%.
Further, described Al2O3The Al of hole body in-spinel-C2O3Content is more than 45%, spinelle (spinel) content 15-30%.
Further, in described Spinel-C, the spinelle content of hole body is more than 75%.
Further, in described MgO-C, the content of MgO of hole body is more than 75%.
Further, described endoporus body thickness is 5-8mm.
The present invention proposes on the basis of the erosion condition of the mouth of a river in have studied existing calcium treated steel casting process.
Research shows, during calcium treated steel continuous casting, and the Al in hole body material in submersed nozzle2O3(include the deoxidation products Al of molten steel2O3), SiO2Forming submellite low melting point phase with the CaO effect in calcium treated steel, cause the mouth of a river to corrode, along with the erosion at the mouth of a river, interior hole body becomes loose porous, and a large amount of molten steels are penetrated into, and accelerates the mouth of a river and corrodes.Containing the mouth of a river of hole body, SiO in zirconium mullite2Content is higher, can form 2CaO Al during casting calcium treated steel2O3·SiO2(anorthite) low melting point phase (fusing point 1590 DEG C), causes interior hole body to corrode more.
According to the erosion mechanism at the calcium treated steel mouth of a river, the CaO composition in steel cannot change, Al2O3A part, can not change from the deoxidation products of molten steel, a part the most substantially from nozzle material, and only way is to reduce or remove the SiO in interior hole body material2Composition, corrodes reducing the generation of low melting point phase and reducing, simultaneously according to containing the interior hole body mouth of a river preferable feature of thermal shock resistance, propose the present invention containing the submersed nozzle of hole body in low-carbon (LC).
The present invention uses containing interior hole body submersed nozzle, utilizes the feature containing the interior hole body mouth of a river with preferable thermal shock resistance, the composition of hole body material in changing so that it is take into account corrosion resistance and thermal shock resistance.The present invention uses low carbonaceous endoporus body, carbon content 6-12%, if carbon content is less than 6%, then the thermal shock resistance of interior hole body material is inadequate, if carbon content is more than 12%, then the heat conductivity of interior hole body material increases, unfavorable to the thermal shock resistance at the mouth of a river.Do not abstain from carbon because of calcium treated steel, certain carbon content can ensure that the thermal shock resistance of interior hole body.SiO2Content controls below 5%, to reduce the erosion of interior hole body and the impact on 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 is more than 75%.Al2O3The Al of hole body in-spinel-C2O3Content is more than 45%, spinelle (spinel) content 15-30%.In Spinel-C, the spinelle content of hole body is more than 75%.In MgO-C, the content of MgO of hole body is more than 75%.Endoporus body thickness 5-8mm.Such interior hole body has the ability of good Ca treated steel resistance, meanwhile, can improve again the thermal shock resistance at the mouth of a river, reduce mouth of a river fracture accident.Because having good corrosion resistance, the flaw detection disqualification rate of plate product can control at reduced levels.
The present invention uses Al containing the bulk material of the submersed nozzle of hole body in low-carbon (LC)2O3-C matter, C content more than 20%, in order to improve the thermal shock resistance of body, add certain zirconium mullite.Slag line section uses conventional ZrO2-C matter, ZrO2Content more than 73%.
The technique effect of the present invention:
The present invention containing low-carbon (LC) Al2O3-C, Al2O3The submersed nozzle of hole body in-spinel-C, Spinel-C or MgO-C, has the ability of good Ca treated steel resistance, meanwhile, can ensure that again the thermal shock resistance at the mouth of a river, can reduce mouth of a river fracture accident.Because the flaw detection disqualification rate with good corrosion resistance, beneficially plate product controls at reduced levels.
Accompanying drawing explanation
Fig. 1 is the immersion type water nozzle structure schematic diagram containing interior hole body；
In figure: hole body in 1,2 bodies, 3 slag lines.
Detailed description of the invention
The invention will be further described with specific embodiment below in conjunction with the accompanying drawings.
Seeing Fig. 1, the present invention's is identical with the existing technique containing interior hole body submersed nozzle containing the submersed nozzle manufacturing process of hole body in low-carbon (LC).A kind of containing the submersed nozzle of hole body in low-carbon (LC), including interior hole body 1, body 2 and slag line section 3.
In the mouth of a river of the present invention hole body material Composition Control and with current material be relatively shown in Table 2, table 3.
Body material of the present invention is Al2O3-C, C content is more than or equal to 20%；Slag line section material is ZrO2-C, ZrO2Content is more than or equal to 73%.The concrete proportioning of mouth of a river body and slag line is as shown in table 1.
The proportioning (wt%) of table 1 mouth of a river body and slag line
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 low carbon content and the SiO of less than 5% of more than 6%2Content, so that it may take into account corrosion resistance and thermal shock resistance.Although and comparative example B1 is containing ZrO2, due to SiO2Content is more, and corrosion resistance is bad.Comparative example B2 is because carbon content is less, and thermal shock resistance is not enough, and interior hole body is susceptible to ftracture and even peels off.
Table 2
Table 3
In above-mentioned table 3, example A5-A8, Main change SiO2With the content of C, control SiO2Below 5%, C content is between 6-12%, can take into account corrosion resistance and thermal shock resistance.The SiO of comparative example B32Content is more, causes corrosion resistance to decline.The C content of B4 is higher, and the heat conductivity of interior hole body is high, particularly winter, and the heat spreader at the mouth of a river is very fast, and the thermal shock resistance at the mouth of a river reduces.
Claims (7)
1., containing a submersed nozzle for hole body in low-carbon (LC), including interior hole body, body and slag line section, it is characterized in that: the material of described interior hole body is Al2O3-C, or Al2O3-spinel-C, or Spinel-C, or MgO-C, C content 6-12%, SiO2Content is less than 5%.
The most according to claim 1 containing the submersed nozzle of hole body in low-carbon (LC), it is characterized in that: described body material is Al2O3-C, C content is more than or equal to 20%；Described slag line section material is ZrO2-C, ZrO2Content is more than or equal to 73%.
The most according to claim 1 and 2 containing the submersed nozzle of hole body in low-carbon (LC), it is characterized in that: described Al2O3The Al of hole body in-C2O3Content is more than 75%.
The most according to claim 1 and 2 containing the submersed nozzle of hole body in low-carbon (LC), it is characterized in that: described Al2O3The Al of hole body in-spinel-C2O3Content is more than 45%, spinelle (spinel) content 15-30%.
The most according to claim 1 and 2 containing the submersed nozzle of hole body in low-carbon (LC), it is characterized in that: in described Spinel-C, the spinelle content of hole body is more than 75%.
The most according to claim 1 and 2 containing the submersed nozzle of hole body in low-carbon (LC), it is characterized in that: in described MgO-C, the content of MgO of hole body is more than 75%.
The most according to claim 1 and 2 containing the submersed nozzle of hole body in low-carbon (LC), it is characterized in that: described endoporus body thickness is 5-8mm.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2021197002A1 (en) * | 2020-03-30 | 2021-10-07 | 宝山钢铁股份有限公司 | Anti-nodulation tundish gas-permeable upper nozzle |
| CN113523262A (en) * | 2020-04-17 | 2021-10-22 | 宝山钢铁股份有限公司 | Anti-blocking submerged nozzle |
| 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 |
| CN115246742A (en) * | 2021-04-28 | 2022-10-28 | 宝山钢铁股份有限公司 | Long nozzle for high-oxygen steel continuous casting |
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| CN113523262A (en) * | 2020-04-17 | 2021-10-22 | 宝山钢铁股份有限公司 | Anti-blocking submerged nozzle |
| CN115246742A (en) * | 2021-04-28 | 2022-10-28 | 宝山钢铁股份有限公司 | Long nozzle for high-oxygen steel continuous casting |
| 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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