CN105985122A - Refractory material for submersed nozzle inner hole body - Google Patents
Refractory material for submersed nozzle inner hole body Download PDFInfo
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- CN105985122A CN105985122A CN201510090840.6A CN201510090840A CN105985122A CN 105985122 A CN105985122 A CN 105985122A CN 201510090840 A CN201510090840 A CN 201510090840A CN 105985122 A CN105985122 A CN 105985122A
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Abstract
The invention relates to a refractory material for a submersed nozzle inner hole body. The refractory material is used for an aluminum-killed steel continuous casting nozzle and particularly for casting of ultra-low-carbon automotive steel with high aluminum content. The refractory material for the submersed nozzle inner hole body is prepared from, by weight, 28%-58% of calcium hexaluminate, 20%-40% of calcium dialuminate, 20%-30% of alumina-magnesia spinel, 4%-6% of additionally added binding agent, namely, phenolic resin and the balance metallic silicon and boron carbide. The refractory material for the inner hole body has excellent alumina clogging resistance, molten steel erosion resistance and thermal shock resistance, can be used for aluminum-killed steel continuous casting and is relatively long in service life, and particularly, when the refractory material is used for casting of the ultra-low-carbon automotive steel with high aluminum content, secondary oxidation caused by the refractory material at the nozzle can be effectively reduced, and nozzle clogging caused by adhesion of alumina in molten steel can be effectively prevented.
Description
Technical field
The present invention relates to hole body refractory material in a kind of submersed nozzle, for aluminum killed steel continuous casting sprue, the automobile steel that particularly Ultra-low carbon aluminum content is high.
Background technology
Aluminum carbonaceous submersed nozzle, except Focal drug-block with in addition to deteriorating, also can produce aluminium oxide clogging in casting process.Particularly when casting aluminum killed steel, often because of Al in molten steel2O3It is deposited on mouth of a river inwall Deng field trash and blocks, and have influence on working continuously of continuous casting.Stick to the field trash of mouth of a river inner surface simultaneously, may come off in casting cycle and fall in molten steel, cause the nonmetal inclusion in continuous casting billet, thus affect the quality of continuous casting steel billet.The position easily producing deposition attachment in the mouth of a river mainly includes the position around the following inwall of submersed nozzle slag line and discharge opening.
For prevention of immersed nozzle clogging, primarily now use following several ways:
1, the Puffer type mouth of a river, argon is that the ventilative lining by the mouth of a river is forced to be blown into, and forms a layer of inert, prevent Alumina build-up on the inner hole wall of the mouth of a river., though nozzle blocking can be alleviated to a certain extent, but there is the problem (in Solidification Process in Continuous Slab Casting, make steel form the defect of pinprick due to the decomposition of argon) making billet quality deteriorate in blowing argon gas in the mouth of a river.
2, notch cuttype submersed nozzle and the sub-submersed nozzle of eddy flow, the inwall at the notch cuttype mouth of a river can change the flow regime of molten steel in the mouth of a river, thus improve aluminium oxide clogging after using notch cuttype；The sub-mouth of a river of eddy flow is also to reduce aluminium oxide blocking by the flow regime of molten steel in the change mouth of a river.In the case of even watering number of times height, both mouths of a river blocking-proof result is not met by requirement.
3, containing the submersed nozzle of interior hole body, Japanese Patent Laid-Open 4-224061 proposes CaO-ZrO2-C inner lining material.Chinese patent CN 1062248C discloses the material of a kind of anti-oxidation aluminum blocking, i.e. adds calcium fluoride in zirconium material with carbon element or zirconium mullite material with carbon element.Both patented technologies are all to utilize aluminium oxide easily to react formation eutectic with the CaO in inner lining material or calcium fluoride, reach to prevent the purpose of alumina deposit.Along with the prolongation of casting time, blockage resisting poor effect, secondly CaO-ZrO2The problem that-C inner lining material exists easy aquation.Japanese Patent Laid-Open 2003-145265 proposes a kind of carbon-free Al2O3-MgO matter blockage resisting inner lining material, this patent uses the inner lining material of low heat conduction, it is possible to decrease the precipitation of steel grade aluminium oxide and the roughening of inner lining surface, thus reduces aluminium oxide blocking.But the problem that this kind of material still suffers from anti-thermal shock difference, it is impossible to fully meet use requirement.
Summary of the invention
It is an object of the invention to provide hole body refractory material in a kind of submersed nozzle, this interior hole body refractory material is Ultra-low carbon and not silicon oxide-containing, has splendid antioxidation aluminium blocking, the erosion of anti-molten steel and thermal shock resistance.It, for aluminum killed steel continuous casting, during the automobile steel that particularly Ultra-low carbon aluminum content is high, can be effectively reduced the secondary oxidation that mouth of a river refractory material causes and the nozzle blocking preventing Alumina build-up in molten steel from causing, and the life-span is relatively long.
In order to realize above-mentioned technical purpose, the present invention adopts the following technical scheme that
Hole body refractory material in a kind of submersed nozzle, the percetage by weight of its chemical constituent is: calcium hexaluminate: 28～58%, Calcium dialuminate: 20～40%, aluminum-spinel: 20～30%, remaining is metallic silicon and boron carbide, additional bonding agent: phenolic resin 4～6%.
In the submersed nozzle of the present invention, hole body refractory material is the interior hole body material of a kind of Ultra-low carbon and not silicon oxide-containing, and it is mainly characterized by using calcium hexaluminate, Calcium dialuminate and aluminum-spinel is primary raw material, and remaining can add metallic silicon and boron carbide.The refractory material of the present invention has splendid antioxidation aluminium blocking, anti-molten steel corrodes and thermal shock resistance, for aluminum killed steel continuous casting, during the automobile steel that particularly Ultra-low carbon aluminum content is high, the secondary oxidation that mouth of a river refractory material causes and the nozzle blocking preventing Alumina build-up in molten steel from causing can be effectively reduced, and the life-span is relatively long.
In the submersed nozzle of the present invention, the manufacture method of hole body is: using calcium hexaluminate, Calcium dialuminate and aluminum-spinel is primary raw material, and employing phenolic resin is bonding agent.Through pelletize, being combined with aluminum carbon body, zirconium carbon slag line after drying, after isostatic pressing, burn till under nonoxidizing atmosphere, firing temperature, between 900 DEG C～1200 DEG C, i.e. can be made into required submersed nozzle.Endoporus body thickness is 5～10mm.
In the present invention, using calcium hexaluminate, Calcium dialuminate, aluminum-spinel is primary raw material, and phenolic resin is the interior hole body prepared by bonding agent, has higher antioxidation aluminium deposition properties, thermal shock resistance and to performances such as molten steel not oxygen supplement.Wherein Calcium dialuminate (CA2) it is that one has higher melt ((1765 ± 25) DEG C), (200 DEG C are 1.4 × 10-6/ DEG C to low-down thermal coefficient of expansion;1400 DEG C, 4. 4 × 10-6/DEG C) compound；Calcium hexaluminate is also to have higher melt (1875 DEG C), has low thermal conductivity (when 650 DEG C 0.32～0.34w/m.k), and thermal coefficient of expansion and corundum are close, is 8 × 10-6/DEG C (20～1000 DEG C)；The fusing point of spinelle is 2135 DEG C, and thermal coefficient of expansion is 8.2 × 10-6/DEG C (20～1000 DEG C), and when 800 DEG C, thermal conductivity is 6.63w/m.k, and spinel has splendid anti-molten steel erosion performance and antioxidation aluminium adhesion property.Interior hole body material with calcium hexaluminate, Calcium dialuminate, spinelle as primary raw material has low thermal conductivity, high thermal shock resistance and not to molten steel oxygen supplement performance, it can be effectively prevented, when casting aluminum killed steel, the nozzle blocking that in molten steel, Alumina build-up causes, and the life-span is considerably long, can be found in embodiment.
Compared with the air blowing mouth of a river, the submersed nozzle of the present invention will not produce and there is the problem (in Solidification Process in Continuous Slab Casting, make due to the decomposition of argon steel form the defect of pinprick) making billet quality deteriorate.Comparing with the sub-mouth of a river of staged and eddy flow, blockage resisting is better, and manufacture difficulty is little.Same CaO-ZrO2The zirconium mullite carbon inner lining material of-C inner lining material or interpolation calcium fluoride is compared, and blockage resisting is better, and the life-span is longer.With carbon-free Al2O3-MgO matter blockage resisting inner lining material is compared, and more preferably, mouth of a river accident rate is low for thermal shock resistance.
Detailed description of the invention
Below in conjunction with specific embodiment, the invention will be further described.
In the submersed nozzle of the present invention, the manufacture method of hole body is: using calcium hexaluminate, Calcium dialuminate and aluminum-spinel is primary raw material, and employing phenolic resin is bonding agent.Through pelletize, being combined with aluminum carbon body, zirconium carbon slag line after drying, after isostatic pressing, burn till under nonoxidizing atmosphere, firing temperature, between 900 DEG C～1200 DEG C, i.e. can be made into required submersed nozzle.
Composition (percetage by weight) and the characteristic of hole body material in the present invention listed by table 1；Composition (percetage by weight) and the characteristic of comparative example listed by table 2.
The composition (percetage by weight) of table 1 the present embodiment and characteristic
The composition (percetage by weight) of other blockage resisting inner lining material of table 2 and characteristic
。
Claims (1)
1. hole body refractory material in a submersed nozzle, it is characterized in that: the percetage by weight of its chemical constituent is: calcium hexaluminate: 28～58%, Calcium dialuminate: 20～40%, aluminum-spinel: 20～30%, remaining is metallic silicon and boron carbide, additional bonding agent: phenolic resin 4～6%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510090840.6A CN105985122A (en) | 2015-02-28 | 2015-02-28 | Refractory material for submersed nozzle inner hole body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510090840.6A CN105985122A (en) | 2015-02-28 | 2015-02-28 | Refractory material for submersed nozzle inner hole body |
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| CN105985122A true CN105985122A (en) | 2016-10-05 |
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| CN201510090840.6A Pending CN105985122A (en) | 2015-02-28 | 2015-02-28 | Refractory material for submersed nozzle inner hole body |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113277861A (en) * | 2021-05-18 | 2021-08-20 | 江苏泰瑞耐火有限公司 | Refractory material for submerged nozzle and application thereof |
| CN113336560A (en) * | 2021-05-18 | 2021-09-03 | 江苏泰瑞耐火有限公司 | Refractory material for long nozzle and preparation method thereof |
| CN113523262A (en) * | 2020-04-17 | 2021-10-22 | 宝山钢铁股份有限公司 | Anti-blocking submerged nozzle |
| CN115108842A (en) * | 2021-03-18 | 2022-09-27 | 宝山钢铁股份有限公司 | Long nozzle for high-oxygen steel continuous casting |
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| CN101096311A (en) * | 2006-06-28 | 2008-01-02 | 宝山钢铁股份有限公司 | Immersion type water gap noumenon material containing calcium oxide |
| CN102351552A (en) * | 2011-07-22 | 2012-02-15 | 武汉钢铁(集团)公司 | Compact calcium hexaluminate-magnesia alumina spinel composite refractory material |
| CN102503451A (en) * | 2011-09-30 | 2012-06-20 | 武汉科技大学 | Composite material containing magnesia-alumina spinel and calcium dialuminate and preparation method thereof |
| CN103992123A (en) * | 2014-04-30 | 2014-08-20 | 江苏泰瑞耐火有限公司 | Brushing-resistant submerged-nozzle inner wall for continuously casting high-manganese high-oxygen steel |
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- 2015-02-28 CN CN201510090840.6A patent/CN105985122A/en active Pending
Patent Citations (4)
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| CN101096311A (en) * | 2006-06-28 | 2008-01-02 | 宝山钢铁股份有限公司 | Immersion type water gap noumenon material containing calcium oxide |
| CN102351552A (en) * | 2011-07-22 | 2012-02-15 | 武汉钢铁(集团)公司 | Compact calcium hexaluminate-magnesia alumina spinel composite refractory material |
| CN102503451A (en) * | 2011-09-30 | 2012-06-20 | 武汉科技大学 | Composite material containing magnesia-alumina spinel and calcium dialuminate and preparation method thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113523262A (en) * | 2020-04-17 | 2021-10-22 | 宝山钢铁股份有限公司 | Anti-blocking submerged nozzle |
| CN115108842A (en) * | 2021-03-18 | 2022-09-27 | 宝山钢铁股份有限公司 | Long nozzle for high-oxygen steel continuous casting |
| CN113277861A (en) * | 2021-05-18 | 2021-08-20 | 江苏泰瑞耐火有限公司 | Refractory material for submerged nozzle and application thereof |
| CN113336560A (en) * | 2021-05-18 | 2021-09-03 | 江苏泰瑞耐火有限公司 | Refractory material for long nozzle and preparation method thereof |
| CN113336560B (en) * | 2021-05-18 | 2022-04-15 | 江苏泰瑞耐火有限公司 | Refractory material for long nozzle and preparation method thereof |
| CN113277861B (en) * | 2021-05-18 | 2022-06-21 | 江苏泰瑞耐火有限公司 | Refractory material for submerged nozzle and application thereof |
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Application publication date: 20161005 |