CN113102743A - High-reliability preheating-free long nozzle for continuous casting and manufacturing method thereof - Google Patents
High-reliability preheating-free long nozzle for continuous casting and manufacturing method thereof Download PDFInfo
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- CN113102743A CN113102743A CN202110406861.XA CN202110406861A CN113102743A CN 113102743 A CN113102743 A CN 113102743A CN 202110406861 A CN202110406861 A CN 202110406861A CN 113102743 A CN113102743 A CN 113102743A
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- long nozzle
- preheating
- continuous casting
- parts
- nozzle
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- 238000009749 continuous casting Methods 0.000 title claims abstract description 29
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 11
- 239000000463 material Substances 0.000 claims abstract description 24
- 238000000034 method Methods 0.000 claims abstract description 15
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 12
- 238000010304 firing Methods 0.000 claims abstract description 12
- 238000003825 pressing Methods 0.000 claims abstract description 12
- 239000010959 steel Substances 0.000 claims abstract description 12
- 229920001971 elastomer Polymers 0.000 claims abstract description 10
- 239000000843 powder Substances 0.000 claims abstract description 10
- 239000002994 raw material Substances 0.000 claims abstract description 6
- 238000007789 sealing Methods 0.000 claims abstract description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 239000007767 bonding agent Substances 0.000 claims description 4
- 239000010431 corundum Substances 0.000 claims description 4
- 229910052593 corundum Inorganic materials 0.000 claims description 4
- 229910002804 graphite Inorganic materials 0.000 claims description 4
- 239000010439 graphite Substances 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 229920001568 phenolic resin Polymers 0.000 claims description 4
- 239000005011 phenolic resin Substances 0.000 claims description 4
- 229910052710 silicon Inorganic materials 0.000 claims description 4
- 239000010703 silicon Substances 0.000 claims description 4
- 230000035939 shock Effects 0.000 abstract description 10
- 238000002360 preparation method Methods 0.000 abstract description 3
- 230000004888 barrier function Effects 0.000 abstract description 2
- 238000009991 scouring Methods 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 11
- 239000010453 quartz Substances 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 230000003628 erosive effect Effects 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 230000008646 thermal stress Effects 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- CSJDCSCTVDEHRN-UHFFFAOYSA-N methane;molecular oxygen Chemical compound C.O=O CSJDCSCTVDEHRN-UHFFFAOYSA-N 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
Images
Classifications
-
- 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
- B22D41/54—Manufacturing or repairing thereof characterised by the materials used therefor
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
Abstract
The invention provides a preheating-free long nozzle for continuous casting and a manufacturing method thereof, and the method specifically comprises the following steps: the method comprises the steps of wrapping an annular three-dimensional silk screen structure erodible material net sleeve on a long nozzle steel mould core, combining an outer rubber sleeve mould with the mould core, adding long nozzle powder into the rubber sleeve mould for filling, sealing the mould, pressing by a press, and finally carrying out subsequent high-temperature firing process treatment to obtain the preheating-free long nozzle for continuous casting of finished products. The invention combines the special raw materials and the preparation process, so that the inner cavity wall of the long nozzle forms a porous structure layer with an annular three-dimensional silk screen. The structure can provide a good heat transfer barrier for the long nozzle, so that the long nozzle has excellent thermal shock resistance, and meanwhile, the material is consistent with the body material and has good anti-scouring performance, thereby improving the application reliability of the long nozzle and providing guarantee for multi-furnace continuous casting.
Description
Technical Field
The invention relates to the technical field of refractory materials, in particular to a high-reliability preheating-free long nozzle for continuous casting and a manufacturing method thereof.
Background
The long nozzle is one of important functional components which play roles in guiding flow and preventing secondary oxidation and splashing of molten steel in the continuous casting process, is responsible for protecting and conveying the molten steel from a ladle to a tundish, avoids secondary oxidation of the molten steel, and can stably convey the molten steel to the tundish. The inner lining body adopted by the prior preheating-free long nozzle is quartz or alumina. The quartz lining body in the preheating-free long nozzle can relieve the action of thermal stress, and the preheating-free high thermal shock resistance is realized. The preheating-free long nozzle is prepared by a two-step method in actual production, firstly, an inner lining body is preformed, then, the inner lining body is sleeved into a steel die, and main powder is filled into the steel die for secondary pressing, so that two pressing steps are realized. In practical use, because the quartz lining body has weak scouring resistance and poor corrosion resistance, the quartz lining body is almost quickly scoured and eroded in about 1 furnace, and the problem of diameter expansion of the inner cavity of the long nozzle or the problem of partial diameter expansion is easily caused, so that the service life of a product is shortened or the faults such as abnormal erosion, damage, perforation and the like occur.
The preheating-free long nozzle prepared by adopting the alumina hollow ball as the inner lining body can utilize hollow heat insulation, attenuate heat transfer, relieve thermal stress and realize preheating-free high thermal shock resistance. The preheating-free long nozzle is processed by a two-step method, the inner cavity of the preheating-free long nozzle has good erosion resistance, but the thermal shock resistance is slightly poorer than that of the preheating-free long nozzle of the quartz lining body, and the preheating-free long nozzle has insufficient adaptability to part of steel types or smelting processes.
The preheating-free long nozzle pressed by the one-step method is characterized in that air is introduced into an inner cavity of the long nozzle through a carbon-oxygen reaction mechanism in a firing process to form an oxidation decarburized layer which has a loose porous structure and is 3-5mm thick, so that heat transfer is attenuated in gaps, and the thermal shock resistance is provided. When the product of the scheme is actually produced, the product needs to be fired in an oxidizing atmosphere, the outer layer of the blank needs to be glazed before firing, and a uniform porous loose layer can be formed by strict requirements on the oxidizing atmosphere and the time and the quantity of air introduced. The preheating-free long nozzle has high requirements on the implementation process, and the problems of batch scrapping or uneven decarburized loose layer are very easy to occur, so that the thermal shock resistance of the product is ineffective.
Disclosure of Invention
The invention provides a preheating-free long nozzle for continuous casting and a manufacturing method thereof, and mainly aims to ensure the controllability of a process technology on the basis of improving the production efficiency of a product by one-step forming, so that an obtained finished preheating-free long nozzle has high thermal shock resistance. The preheating-free long nozzle for continuous casting comprises a nozzle body, wherein a wire mesh of a three-dimensional porous layer is arranged on the inner wall of the nozzle body.
Further, the thickness of the three-dimensional porous layer of the silk screen is 5-10 mm.
Further, the wire mesh is of an annular wire mesh woven structure.
Further, the water gap body comprises the following raw materials in parts by weight: 20-25 parts of graphite, 50-55 parts of tabular corundum, 2-3 parts of metal silicon, 10-20 parts of alumina hollow spheres and 7-8 parts of phenolic resin bonding agent.
Further, the material composition of the three-dimensional porous layer is consistent with that of the water gap body material.
Further, the material composition of the wire mesh is consistent with the material of the nozzle body.
The invention also provides a manufacturing method of the preheating-free long nozzle for continuous casting, which comprises the following steps:
(1) wrapping the three-dimensional porous layer wire mesh on a long nozzle steel mould core;
(2) combining an outer rubber sleeve mold with a mold core, and then adding the long nozzle powder into the rubber sleeve mold for filling;
(3) after the powder is filled, sealing the mold and then pressing the mold in a press;
(4) and taking out the pressed material and firing at high temperature to obtain the finished product, namely the preheating-free long nozzle for continuous casting.
Further, the pressing pressure in the step (3) is 30-40MPa, and the dwell time is 10-30 s.
Further, the firing temperature in the step (4) is 900-.
The preheating-free high-reliability long nozzle provided by the invention takes the annular three-dimensional wire mesh porous structure layer as a thermal stress buffer layer and a body material layer responsible for the service of the long nozzle. Meanwhile, the outer layer of the conventional water gap bowl part is wrapped by a steel shell, so that not only can enough structural strength be provided, but also the conventional water gap bowl part and the concave-convex structure of the cross section of the water gap bowl part can be combined to form an argon gas sealing air chamber.
Compared with the prior art, the invention has the beneficial technical effects that:
the invention provides a preheating-free long nozzle for continuous casting and a manufacturing method thereof. According to the invention, by the additive printing technology, the annular three-dimensional silk screen porous structure prepared by taking the water gap body material as the raw material has higher strength, and can provide a good heat transfer barrier for the long water gap and provide a better gap heat insulation effect. The gap structure has the characteristics of controllable quantity and scale and the like, the thermal shock performance of the material is consistent, the gap heat insulation effect is good, the reliability of the performance of the thermal shock resistance of the product is improved, the one-step pressing is realized, and the production efficiency of the product is improved. The preheating-free long nozzle for continuous casting prepared by the method has good erosion resistance on the premise of excellent thermal shock resistance, so that the application reliability of the long nozzle is improved, and the guarantee is provided for multi-furnace continuous casting.
Drawings
The invention is further described in the following description with reference to the drawings.
Fig. 1 is a schematic structural view of a high-reliability preheating-free long nozzle of the invention.
Detailed Description
Example 1
The preheating-free long nozzle for continuous casting comprises a nozzle body, wherein a silk screen of a three-dimensional porous layer is arranged on the inner wall of the nozzle body, the thickness of the three-dimensional porous layer of the silk screen is 5-10mm, and the silk screen is of an annular silk screen woven structure.
Further, the water gap body comprises the following raw materials in parts by weight: 20 parts of graphite, 50 parts of tabular corundum, 3 parts of metal silicon, 20 parts of alumina hollow spheres and 7 parts of phenolic resin bonding agent.
The material composition of the three-dimensional porous layer is consistent with that of the water gap body material.
The preparation method of the preheating-free long nozzle for continuous casting comprises the following steps:
(1) covering an annular three-dimensional silk screen structure erodible material net with a layer of 5-10mm thickness on a long nozzle steel mould core;
(2) combining an outer rubber sleeve mold with a mold core, and then adding the long nozzle powder into the rubber sleeve mold for filling;
(3) after the powder is filled, sealing the mold, and pressing by a press, wherein the pressing pressure is 30MPa, and the pressure maintaining time is 15 s;
(4) and taking out the pressed material to be fired at high temperature, wherein the firing temperature is 950 ℃, the firing time is 9 hours, and the preheating-free long nozzle for the finished product continuous casting is obtained after the firing is finished.
Test example 1
The mechanical properties of the non-preheated long nozzle for continuous casting prepared in example 1 were measured, and the results were as follows:
| item/fired Material | Apparent porosity% | Bulk density, g/cm3 | Normal temperature rupture strength/MPa |
| Inner hole body | 23.67％ | 2.56 | / |
| Body | 15.76％ | 2.64 | 25.53 |
Example 2
The preheating-free long nozzle for continuous casting comprises a nozzle body, wherein a silk screen of a three-dimensional porous layer is arranged on the inner wall of the nozzle body, the thickness of the three-dimensional porous layer of the silk screen is 5-10mm, and the silk screen is of an annular silk screen woven structure.
Further, the water gap body comprises the following raw materials in parts by weight:
25 parts of graphite, 55 parts of tabular corundum, 2 parts of metal silicon, 10 parts of alumina hollow spheres and 8 parts of phenolic resin bonding agent.
The material composition of the three-dimensional porous layer is consistent with that of the water gap body material.
The preparation method of the preheating-free long nozzle for continuous casting comprises the following steps:
(1) covering an annular three-dimensional silk screen structure erodible material net with a layer of 5-10mm thickness on a long nozzle steel mould core;
(2) combining an outer rubber sleeve mold with a mold core, and then adding the long nozzle powder into the rubber sleeve mold for filling;
(3) after the powder is filled, sealing the mold, and pressing by a press, wherein the pressing pressure is 40MPa, and the pressure maintaining time is 10 s;
(4) and taking out the pressed material to be fired at a high temperature of 980 ℃ for 6h, and obtaining the finished product continuous casting preheating-free long nozzle after firing.
Test example 2
The mechanical properties of the non-preheated long nozzle for continuous casting prepared in example 2 were measured, and the results were as follows:
| item/fired Material | Apparent porosity% | Bulk density, g/cm3 | Normal temperature rupture strength/MPa |
| Inner hole body | 22.38％ | 2.45 | / |
| Body | 14.36％ | 2.53 | 24.53 |
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (8)
1. The preheating-free long nozzle for continuous casting is characterized by comprising a nozzle body, wherein a wire mesh of a three-dimensional porous layer is arranged on the inner wall of the nozzle body.
2. The non-preheating long nozzle for continuous casting according to claim 1, wherein the thickness of the three-dimensional porous layer of the wire mesh is 5-10 mm.
3. The non-preheating long nozzle for continuous casting according to claim 1, wherein the wire mesh is an annular wire mesh woven structure.
4. The non-preheating long nozzle for continuous casting according to claim 1, wherein the nozzle body comprises the following raw materials in parts by weight: 20-25 parts of graphite, 50-55 parts of tabular corundum, 2-3 parts of metal silicon, 10-20 parts of alumina hollow spheres and 7-8 parts of phenolic resin bonding agent.
5. The non-preheating long nozzle for continuous casting according to claim 1, wherein the material composition of the three-dimensional porous layer is consistent with the material of the nozzle body.
6. The manufacturing method of the continuous casting preheating-free long nozzle according to any one of claims 1 to 5, characterized by comprising the following steps:
(1) wrapping the three-dimensional porous layer wire mesh on a long nozzle steel mould core;
(2) combining an outer rubber sleeve mold with a mold core, and then adding the long nozzle powder into the rubber sleeve mold for filling;
(3) after the powder is filled, sealing the mold and then pressing the mold in a press;
(4) and taking out the pressed material and firing at high temperature to obtain the finished product, namely the preheating-free long nozzle for continuous casting.
7. The method according to claim 6, wherein the pressing pressure in step (3) is 30 to 40MPa, and the dwell time is 10 to 30 s.
8. The method as claimed in claim 6, wherein the firing temperature in step (4) is 900-1000 ℃ and the firing time is 6-10 h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110406861.XA CN113102743B (en) | 2021-04-15 | 2021-04-15 | High-reliability preheating-free long nozzle for continuous casting and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110406861.XA CN113102743B (en) | 2021-04-15 | 2021-04-15 | High-reliability preheating-free long nozzle for continuous casting and manufacturing method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113102743A true CN113102743A (en) | 2021-07-13 |
| CN113102743B CN113102743B (en) | 2022-09-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110406861.XA Active CN113102743B (en) | 2021-04-15 | 2021-04-15 | High-reliability preheating-free long nozzle for continuous casting and manufacturing method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2740070A1 (en) * | 1976-09-10 | 1978-03-16 | Produits Refractaires | PIPE |
| EP0370095A1 (en) * | 1988-05-03 | 1990-05-30 | Vesuvius Crucible Co | Ladle shroud with co-pressed gas permeable ring. |
| JPH09239504A (en) * | 1996-03-04 | 1997-09-16 | Shinagawa Refract Co Ltd | Submerged nozzle for continuous casting of steel containing high oxygen |
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| CN1694774A (en) * | 2002-09-03 | 2005-11-09 | 维苏维尤斯·克鲁斯布公司 | Gas purged nozzle |
| JP2006130555A (en) * | 2004-10-04 | 2006-05-25 | Kurosaki Harima Corp | Long nozzle for continuous casting and continuous casting method |
| CN102941327A (en) * | 2012-11-30 | 2013-02-27 | 莱芜钢铁集团有限公司 | Flexible continuously cast water gap and manufacturing method thereof |
| JP2015123474A (en) * | 2013-12-26 | 2015-07-06 | 黒崎播磨株式会社 | Immersion nozzle |
| CN105108132A (en) * | 2015-08-28 | 2015-12-02 | 北京利尔高温材料股份有限公司 | Nitrogen-increase-preventing long nozzle for continuous casting ladle |
| CN105127409A (en) * | 2015-09-15 | 2015-12-09 | 辽宁科技大学 | Preheating-free long nozzle capable of being repeatedly used and preparing method thereof |
| CN106216653A (en) * | 2016-09-26 | 2016-12-14 | 北京利尔高温材料股份有限公司 | A kind of long nozzle for continuous casting and manufacture method thereof |
| CN209918880U (en) * | 2019-04-02 | 2020-01-10 | 济南宏光耐火材料有限公司 | Thermal shock resistance zirconium metering nozzle |
-
2021
- 2021-04-15 CN CN202110406861.XA patent/CN113102743B/en active Active
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2740070A1 (en) * | 1976-09-10 | 1978-03-16 | Produits Refractaires | PIPE |
| FR2364082A1 (en) * | 1976-09-10 | 1978-04-07 | Sepr | Casting pipe contg. a tube impermeable to gas - and used in the low pressure casting of metals and alloys |
| EP0370095A1 (en) * | 1988-05-03 | 1990-05-30 | Vesuvius Crucible Co | Ladle shroud with co-pressed gas permeable ring. |
| JPH09239504A (en) * | 1996-03-04 | 1997-09-16 | Shinagawa Refract Co Ltd | Submerged nozzle for continuous casting of steel containing high oxygen |
| KR20030037844A (en) * | 2001-11-06 | 2003-05-16 | 주식회사 포스코 | Nozzle of continuous casting machine |
| CN1694774A (en) * | 2002-09-03 | 2005-11-09 | 维苏维尤斯·克鲁斯布公司 | Gas purged nozzle |
| JP2006130555A (en) * | 2004-10-04 | 2006-05-25 | Kurosaki Harima Corp | Long nozzle for continuous casting and continuous casting method |
| CN102941327A (en) * | 2012-11-30 | 2013-02-27 | 莱芜钢铁集团有限公司 | Flexible continuously cast water gap and manufacturing method thereof |
| JP2015123474A (en) * | 2013-12-26 | 2015-07-06 | 黒崎播磨株式会社 | Immersion nozzle |
| CN105108132A (en) * | 2015-08-28 | 2015-12-02 | 北京利尔高温材料股份有限公司 | Nitrogen-increase-preventing long nozzle for continuous casting ladle |
| CN105127409A (en) * | 2015-09-15 | 2015-12-09 | 辽宁科技大学 | Preheating-free long nozzle capable of being repeatedly used and preparing method thereof |
| CN106216653A (en) * | 2016-09-26 | 2016-12-14 | 北京利尔高温材料股份有限公司 | A kind of long nozzle for continuous casting and manufacture method thereof |
| CN209918880U (en) * | 2019-04-02 | 2020-01-10 | 济南宏光耐火材料有限公司 | Thermal shock resistance zirconium metering nozzle |
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| CN113102743B (en) | 2022-09-13 |
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Effective date of registration: 20240423 Address after: 276806 middle section of Zhenjiang Road, Hushan Town, Lanshan, Rizhao City, Shandong Province Patentee after: Rizhao lier high temperature New Material Co.,Ltd. Country or region after: China Address before: 102211 building 4, Xiaotangshan Industrial Park, Xiaotangshan Town, Changping District, Beijing Patentee before: BEIJING LIER HIGH-TEMPERATURE MATERIALS Co.,Ltd. Country or region before: China |
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