CN111168050A - High-corrosion-resistance core nozzle for strip continuous casting and manufacturing method thereof - Google Patents
High-corrosion-resistance core nozzle for strip continuous casting and manufacturing method thereof Download PDFInfo
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- CN111168050A CN111168050A CN202010025451.6A CN202010025451A CN111168050A CN 111168050 A CN111168050 A CN 111168050A CN 202010025451 A CN202010025451 A CN 202010025451A CN 111168050 A CN111168050 A CN 111168050A
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- core nozzle
- continuous casting
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- strip continuous
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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
- B22D41/50—Pouring-nozzles
- B22D41/52—Manufacturing or repairing thereof
- B22D41/54—Manufacturing or repairing thereof characterised by the materials used therefor
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Compositions Of Oxide Ceramics (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
Abstract
本发明涉及一种薄带连铸用高耐蚀核心水口及制造方法。该核心水口的成分由ZrO2、Al2O3和C组成。该核心水口的制造方法为：各种成分按一定配比混合均匀，接着混合料装入模具，然后在常温下静置一段时间，接着经过等静压工艺压制成型，在一定温度下烧结一定时间，即得成品。所制得的核心水口用于双辊薄带连铸，其耐钢水侵蚀性好，可在1600℃钢水中连续浸泡10小时以上不与钢水剧烈反应大量成渣，从而提高薄带连铸连浇炉数至8炉以上，降低了生产成本。The invention relates to a high corrosion-resistant core nozzle for thin strip continuous casting and a manufacturing method. The composition of the core nozzle consists of ZrO 2 , Al 2 O 3 and C. The manufacturing method of the core nozzle is as follows: various components are mixed uniformly according to a certain ratio, then the mixture is loaded into a mold, and then allowed to stand for a period of time at room temperature, then pressed and formed by an isostatic pressing process, and sintered at a certain temperature for a certain period of time , the finished product is obtained. The obtained core nozzle is used for twin-roll thin strip continuous casting, and has good corrosion resistance of molten steel. The number of furnaces is more than 8, which reduces the production cost.
Description
Technical Field
The invention belongs to the field of strip continuous casting, and particularly relates to a high-corrosion-resistant core nozzle for strip continuous casting and a manufacturing method thereof.
Background
The thin strip continuous casting technology is a novel thin strip steel production process and has the advantages of low equipment investment, simple production process, low energy consumption, low product cost and the like. The core nozzle is an important component for thin-strip continuous casting, three important use requirements must be met, and firstly, the core nozzle has good thermal shock resistance and can withstand the instant impact of molten steel at 1600 ℃ without cracking; secondly, the fracture strength is high, and the fracture does not occur under the condition that molten steel at 1600 ℃ is flushed and soaked for a long time; thirdly, the corrosion resistance of the molten steel is good, the steel can be soaked in the molten steel at 1600 ℃ for a long time, and the severe reaction with the molten steel is avoided, so that a large amount of slag is formed. At present, most of core water gaps are magnesium aluminate spinel (MgAl)2O4) Graphite material, although meeting the requirements of thermal shock resistance and breaking strength, has poor molten steel erosion resistance. The main reasons include: first, MgAl2O4The molten steel erosion resistance is poor; secondly, the content of graphite C is higher and is 20-25%, and after the graphite C reacts with the residual oxygen of steel in a molten pool, more loose holes are left on a core nozzle, so that more spaces are left for the molten steel to permeate into the core nozzle for erosion. At present, a core nozzle used for continuously casting the thin strip is soaked in molten steel for about 2 hours and reacts with the molten steel to form a large amount of slag, so that the number of continuous casting furnaces and the production continuity of the continuously casting thin strip are limited to a great extent, and the production cost is increased.
The invention designs a new chemical composition and uses a new erosion-resistant component ZrO2And Al2O3Completely replace the original MgAl2O4And simultaneously, a corresponding nozzle manufacturing process is developed, so that the molten steel erosion resistance of the core nozzle is greatly improved. In the invention, the core nozzle can be continuously soaked in molten steel at 1600 ℃ for more than 10 hours, the surface of the core nozzle does not react with the molten steel obviously to form large oxide slag, the number of continuous casting furnaces is maintained to be more than 8, and the product quality is good, so that the continuity of the continuous casting production of the thin strip is improved, the production cost is reduced, and the strip steel product for the continuous casting of the thin strip has more cost advantages.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide a high-corrosion-resistance core nozzle for strip continuous casting and a manufacturing method thereof, so as to improve the molten steel corrosion resistance of the core nozzle.
The technical scheme for realizing the purpose of the invention is as follows:
the embodiment of the invention discloses a high-corrosion-resistance core nozzle for strip casting and a manufacturing method thereof, wherein the core nozzle comprises ZrO2，Al2O3And C. The manufacturing method comprises the steps of mixing raw materials, filling a mold, standing, pressing by isostatic pressing, sintering and forming, and processing to obtain a finished product.
The core nozzle comprises 35-85% ZrO in percentage by mass2，0％～55％Al2O3And 10% -15% of C.
And the isostatic pressing is carried out, the isostatic pressure maintaining pressure is higher than 60MPa, and the pressure maintaining time is longer than 45 minutes.
And sintering and forming, wherein the atmosphere is nitrogen, the heating rate is lower than 20 ℃ per minute, the temperature is increased to 1000-1200 ℃, then the temperature is kept for 36-45 hours, and then the temperature is cooled to room temperature along with the furnace.
Advantageous technical effects
The invention uses a novel erosion-resistant component ZrO in the core nozzle component2And Al2O3Completely replace the original MgAl2O4Thereby greatly improving the molten steel erosion resistance of the core nozzle and being capable of continuously soaking in molten steel at 1600 ℃ for 10 hoursDoes not react with molten steel violently to form a large amount of slag, thereby increasing the number of continuous casting furnaces, improving the production continuity and reducing the production cost.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs.
To illustrate the effect of chemical composition on the molten steel erosion resistance of the core nozzle, the results of the specific comparative examples and examples are shown in table 1 below:
TABLE 1 ingredients of comparative examples and effects of molten steel corrosion resistance
The above table shows that the core nozzle manufactured by the components of the invention has better molten steel erosion resistance, and the time length of the core nozzle which is soaked in the molten steel and does not have obvious reaction can be remarkably prolonged to more than 10 hours.
The core nozzle chemistry for examples 1-5 in table 1, the manufacturing process and the corresponding finished oxidation, overburning and cracking are shown in table 2 below:
TABLE 2 core nozzle manufacturing Process and finished product Oxidation and cracking
As can be seen from table 2, according to the core nozzle manufacturing method of the present invention, the finished product is not oxidized and is free from overburning and cracking.
The foregoing is directed to embodiments of the present invention and it is noted that various modifications and adaptations of the invention may occur to those skilled in the art without departing from the scope and spirit of the invention.
Claims (6)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010025451.6A CN111168050B (en) | 2020-01-10 | 2020-01-10 | High-corrosion-resistance core nozzle for strip continuous casting and manufacturing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010025451.6A CN111168050B (en) | 2020-01-10 | 2020-01-10 | High-corrosion-resistance core nozzle for strip continuous casting and manufacturing method thereof |
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| CN111168050A true CN111168050A (en) | 2020-05-19 |
| CN111168050B CN111168050B (en) | 2022-06-10 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4691844A (en) * | 1986-08-08 | 1987-09-08 | Toshiba Ceramics Co., Ltd. | Immersion nozzle for continuous casting |
| AU607359B2 (en) * | 1987-09-03 | 1991-02-28 | Sumitomo Metal Industries Ltd. | A nozzle for discharging molten metal used in a casting device |
| JPH07112251A (en) * | 1993-10-14 | 1995-05-02 | Nippon Steel Corp | Immersion nozzle for continuous casting |
| CN102584301A (en) * | 2012-03-09 | 2012-07-18 | 西安建筑科技大学 | Method for preparing zirconium oxide metering nozzle |
| JP2012187622A (en) * | 2011-03-14 | 2012-10-04 | Akechi Ceramics Co Ltd | Nozzle for continuous casting |
| CN110090946A (en) * | 2019-05-23 | 2019-08-06 | 江苏沙钢集团有限公司 | A core nozzle for thin strip continuous casting and its manufacturing method |
| CN110668801A (en) * | 2019-10-24 | 2020-01-10 | 河南工业大学 | High thermal shock sintered Al2O3-ZrO2-C sliding plate brick and preparation method thereof |
-
2020
- 2020-01-10 CN CN202010025451.6A patent/CN111168050B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4691844A (en) * | 1986-08-08 | 1987-09-08 | Toshiba Ceramics Co., Ltd. | Immersion nozzle for continuous casting |
| AU607359B2 (en) * | 1987-09-03 | 1991-02-28 | Sumitomo Metal Industries Ltd. | A nozzle for discharging molten metal used in a casting device |
| JPH07112251A (en) * | 1993-10-14 | 1995-05-02 | Nippon Steel Corp | Immersion nozzle for continuous casting |
| JP2012187622A (en) * | 2011-03-14 | 2012-10-04 | Akechi Ceramics Co Ltd | Nozzle for continuous casting |
| CN102584301A (en) * | 2012-03-09 | 2012-07-18 | 西安建筑科技大学 | Method for preparing zirconium oxide metering nozzle |
| CN110090946A (en) * | 2019-05-23 | 2019-08-06 | 江苏沙钢集团有限公司 | A core nozzle for thin strip continuous casting and its manufacturing method |
| CN110668801A (en) * | 2019-10-24 | 2020-01-10 | 河南工业大学 | High thermal shock sintered Al2O3-ZrO2-C sliding plate brick and preparation method thereof |
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| CN111168050B (en) | 2022-06-10 |
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Denomination of invention: A high corrosion-resistant core nozzle for thin strip casting and its manufacturing method Granted publication date: 20220610 Pledgee: China Construction Bank Zhangjiagang branch Pledgor: INSTITUTE OF RESEARCH OF IRON & STEEL,SHAGANG,JIANGSU PROVINCE Registration number: Y2025980042535 |
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