CN110918913A - Covering slag for continuous casting high-carbon steel small square billet crystallizer - Google Patents
Covering slag for continuous casting high-carbon steel small square billet crystallizer Download PDFInfo
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- CN110918913A CN110918913A CN201911104703.8A CN201911104703A CN110918913A CN 110918913 A CN110918913 A CN 110918913A CN 201911104703 A CN201911104703 A CN 201911104703A CN 110918913 A CN110918913 A CN 110918913A
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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
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/111—Treating the molten metal by using protecting powders
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Abstract
The invention provides a covering slag for a continuous casting high-carbon steel billet crystallizer, which comprises the following main components in percentage by mass: SiO 2233‑34%、CaO 24‑25%、Al2O39‑11%、MgO 4‑5%、Na210-11% of O, 9-10% of F and 6-7% of C; the alkalinity of the covering slag is 0.70-0.76, the melting point is 1020 +/-10 ℃, the melting speed is 20 +/-5 seconds, and the viscosity is 0.180-0.250 Pa.S. The casting powder for the continuous casting high-carbon steel small square billet crystallizer improves the lubricating speed of the casting powder by adjusting the carbon black amount in the casting powder. And the alkalinity of the casting powder is improved, so that the fluidity of the casting powder slag is enhanced, and the content of MgO is increased, so that the fluidity of the casting powder slag is increased. In addition, the content of F is increased to increase CaF2Content, the viscosity of the casting powder is obviously reduced. In the case of producing steel grades using the same continuous casting machine, the thickness of the liquid slag layer was increased from 5-6mm to 9-11mm by trial use of the adjusted mold flux. The carbon-rich amount of the continuous casting billet is obviously reduced, and the carbon-rich rate of the same steel grade is gradually reduced from the original more than 10 percentLess than 0.1 percent of the new casting powder used.
Description
Technical Field
The invention relates to the field of metallurgical continuous casting, in particular to covering slag for a continuous casting high-carbon steel small square billet crystallizer.
Background
The protective slag of continuous casting crystallizer is the main consumption raw material which has direct influence on the stability of continuous casting process and the quality of casting blank, and is added into the crystallizer during continuous casting production and mainly consists of SiO2、CaO、CaF2、Al2O3、Na2O, C and the like. The casting powder added into the crystallizer is influenced by the heat of molten steel and is divided into a liquid slag layer, a sintering layer and a powder slag layer, and the following functions are realized through the three-layer structure and chemical reaction: the method has the advantages of keeping the temperature of the surface of the molten steel, preventing secondary oxidation of air to the molten steel, absorbing floating impurities on the surface of the molten steel, lubricating a solidified blank shell and a crystallizer and controlling the heat transfer speed and uniformity in the casting blank cooling process.
In the use process of the protective slag used for continuously casting high-carbon steel small square billets (140 mm multiplied by 140 mm), the thickness of a slag layer of the protective slag liquid is only 5-6mm, if the liquid level of a crystallizer is poorly controlled, the liquid level of the crystallizer fluctuates, so that the molten steel in the crystallizer is easy to curl slag, or the molten steel is easy to contact with a slag layer of the protective slag powder, and the molten steel absorbs carbon from the protective slag, so that the local carbon enrichment of the billets is caused.
Disclosure of Invention
In order to increase the thickness of a liquid slag layer of the casting powder, reduce carbon absorption of molten steel from the casting powder and reduce local carbon enrichment of a steel billet, the invention provides the casting powder for a continuous casting high-carbon steel billet crystallizer, which comprises the following main components in percentage by mass:
SiO233-34%、CaO 24-25%、Al2O39-11%、MgO 4-5%、Na210-11% of O, 9-10% of F and 6-7% of C; the alkalinity of the covering slag is 0.70-0.76, the melting point is 1020 +/-10 ℃, the melting speed is 20 +/-5 seconds, and the viscosity is 0.180-0.250 Pa.S.
Further, the mold flux comprises the following components in percentage by mass: SiO 2233.46%、CaO24.68%、Al2O39.98%、MgO 4.32%、Na210.44% of O, 9.28% of F and 6.69% of C; the alkalinity of the covering slag is 0.72, the melting point is 1030 ℃, the melting speed is 25 seconds, and the viscosity is 0.198 Pa.S.
Furthermore, the covering slag comprises the following components in percentage by mass: SiO 2233.67%、CaO24.69%、Al2O39.53%、MgO 4.49%、Na2O10.50%, F9.23%, C6.79%; the alkalinity of the covering slag is 0.72, the melting point is 1020 ℃, and the melting speed is 21 secondsViscosity 0.200 Pa.S.
The invention has the following technical effects:
1. according to the invention, the carbon content and other components of the casting powder are adjusted to improve the melting speed of the casting powder, and the viscosity and the melting point of the casting powder are reduced, so that the thickness of a liquid slag layer is increased from 5-6mm to 9-11 mm.
2. The carbon-rich amount of the continuous casting billet in the production process is obviously reduced, and the carbon-rich rate of the same steel grade is reduced from the original more than 10 percent to less than 0.1 percent of the carbon-rich rate of the same steel grade after the casting powder is used.
3. The invention enables the covering slag to meet the field requirement by reasonably adjusting the components without increasing the cost.
Detailed Description
The following examples are included to further illustrate the invention:
example 1:
the medium-high carbon spring steel 65 steel is cast by using unmodified casting powder and mainly comprises the components of SiO2：34.46%，CaO：21.99%，Al2O3：12.10%，MgO：1.45%，Na2O: 10.14%, F: 4.74%, C: 14.85%, basicity: 0.64, melting point: 1052 ℃, melting rate: 42 seconds, viscosity: 0.352 Pa.S.
The cast medium-high carbon spring steel 65 uses the unmodified casting powder for one month, the co-production is 4878.278 tons, the carbon-rich judgment rate is 544.964 tons, and the carbon-rich judgment rate of the steel is 11.17 percent.
Example 2:
the medium-high carbon spring steel 65 steel is cast by using the improved casting powder, and the main component of the medium-high carbon spring steel is SiO233.46%、CaO 24.68%、Al2O39.98%、MgO 4.32%、Na210.44% of O, 9.28% of F and 6.69% of C; the alkalinity of the covering slag is 0.72, the melting point is 1030 ℃, the melting speed is 25 seconds, and the viscosity is 0.198 Pa.S.
The cast medium-high carbon spring steel 65 uses the improved mold flux for one month, the co-production is 8355.775 tons, the carbon-rich judgment rate is 106.384 tons, and the carbon-rich judgment rate of the steel is 1.27%.
Example 3:
with improved protectionThe medium-high carbon spring steel 65 steel cast by slag mainly comprises the components of SiO233.67%、CaO 24.69%、Al2O39.53%、MgO 4.49%、Na2O10.50%, F9.23%, C6.79%; the alkalinity of the covering slag is 0.72, the melting point is 1020 ℃, the melting speed is 21 seconds, and the viscosity is 0.200 Pa.S.
The cast medium-high carbon spring steel 65 uses the improved covering slag for one month, the co-production is 12726.98 tons, the carbon-rich judgment is 4.703 tons, and the carbon-rich judgment rate of the steel is 0.037 percent.
The casting powder for the continuous casting high-carbon steel small square billet crystallizer improves the lubricating speed of the casting powder by adjusting the carbon black amount in the casting powder. And the alkalinity of the casting powder is improved, so that the fluidity of the casting powder slag is enhanced, and the content of MgO is increased, so that the fluidity of the casting powder slag is increased. In addition, the content of F is increased to increase CaF2Content, the viscosity of the casting powder is obviously reduced.
In the case of producing steel grades using the same continuous casting machine, the thickness of the liquid slag layer was increased from 5-6mm to 9-11mm by trial use of the adjusted mold flux. The carbon-rich amount of the continuous casting billet is obviously reduced, and the carbon-rich rate of the same steel grade is gradually reduced from the original more than 10% to less than 0.1% of that of the new covering slag.
Claims (3)
1. The covering slag for the continuous casting high-carbon steel billet crystallizer is characterized by comprising the following components in percentage by mass: SiO 2233-34%、CaO 24-25%、Al2O39-11%、MgO 4-5%、Na210-11% of O, 9-10% of F and 6-7% of C; the alkalinity of the covering slag is 0.70-0.76, the melting point is 1020 +/-10 ℃, the melting speed is 20 +/-5 seconds, and the viscosity is 0.180-0.250 Pa.S.
2. The mold flux for the continuous casting high-carbon steel billet crystallizer as claimed in claim 1, wherein the composition of the mold flux comprises the following components by mass percent: SiO 2233.46%、CaO 24.68%、Al2O39.98%、MgO 4.32%、Na210.44% of O, 9.28% of F and 6.69% of C; the alkalinity of the covering slag is 0.72, the melting point is 1030 ℃, and the melting is carried outSpeed 25 seconds, viscosity 0.198 Pa.S.
3. The mold flux for the continuous casting high-carbon steel billet crystallizer as claimed in claim 1, wherein the composition of the mold flux comprises the following components by mass percent: SiO 2233.67%、CaO 24.69%、Al2O39.53%、MgO 4.49%、Na2O10.50%, F9.23%, C6.79%; the alkalinity of the covering slag is 0.72, the melting point is 1020 ℃, the melting speed is 21 seconds, and the viscosity is 0.200 Pa.S.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911104703.8A CN110918913A (en) | 2019-11-13 | 2019-11-13 | Covering slag for continuous casting high-carbon steel small square billet crystallizer |
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| CN201911104703.8A CN110918913A (en) | 2019-11-13 | 2019-11-13 | Covering slag for continuous casting high-carbon steel small square billet crystallizer |
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| CN110918913A true CN110918913A (en) | 2020-03-27 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111590043A (en) * | 2020-06-30 | 2020-08-28 | 广东韶钢松山股份有限公司 | Design method of secondary cooling water in high-carbon steel continuous casting process and continuous casting billet preparation method |
| CN113333702A (en) * | 2021-06-29 | 2021-09-03 | 广东韶钢松山股份有限公司 | High-carbon chromium bearing steel continuous casting crystallizer casting powder and application thereof |
| CN114472823A (en) * | 2021-12-29 | 2022-05-13 | 武钢中冶工业技术服务有限公司 | Crystallizer casting powder |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03193248A (en) * | 1989-12-25 | 1991-08-23 | Sumitomo Metal Ind Ltd | Mold powder for continuously casting steel |
| JPH04138857A (en) * | 1990-09-29 | 1992-05-13 | Kobe Steel Ltd | Flux for continuous casting |
| JPH04224063A (en) * | 1990-12-21 | 1992-08-13 | Sumitomo Metal Ind Ltd | Mold powder for continuous casting |
| US5366535A (en) * | 1992-12-07 | 1994-11-22 | Premier Services Corporation | Basic tundish covering compound |
| JPH0985404A (en) * | 1995-09-19 | 1997-03-31 | Nippon Yakin Kogyo Co Ltd | Flux for continuously casting a1-containing molten steel and continuous casting method |
| CN103223477A (en) * | 2013-05-14 | 2013-07-31 | 内蒙古包钢钢联股份有限公司 | Continuous casting crystallizer covering slag for high-carbon steel |
| CN104043797A (en) * | 2014-02-13 | 2014-09-17 | 攀钢集团攀枝花钢铁研究院有限公司 | Ultra-low-sulfur high-chromium steel continuous casting method and bloom prepared by same |
| CN105642848A (en) * | 2016-02-23 | 2016-06-08 | 宝钢特钢有限公司 | Continuous casting mould fluxes for high-carbon steel |
-
2019
- 2019-11-13 CN CN201911104703.8A patent/CN110918913A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03193248A (en) * | 1989-12-25 | 1991-08-23 | Sumitomo Metal Ind Ltd | Mold powder for continuously casting steel |
| JPH04138857A (en) * | 1990-09-29 | 1992-05-13 | Kobe Steel Ltd | Flux for continuous casting |
| JPH04224063A (en) * | 1990-12-21 | 1992-08-13 | Sumitomo Metal Ind Ltd | Mold powder for continuous casting |
| US5366535A (en) * | 1992-12-07 | 1994-11-22 | Premier Services Corporation | Basic tundish covering compound |
| JPH0985404A (en) * | 1995-09-19 | 1997-03-31 | Nippon Yakin Kogyo Co Ltd | Flux for continuously casting a1-containing molten steel and continuous casting method |
| CN103223477A (en) * | 2013-05-14 | 2013-07-31 | 内蒙古包钢钢联股份有限公司 | Continuous casting crystallizer covering slag for high-carbon steel |
| CN104043797A (en) * | 2014-02-13 | 2014-09-17 | 攀钢集团攀枝花钢铁研究院有限公司 | Ultra-low-sulfur high-chromium steel continuous casting method and bloom prepared by same |
| CN105642848A (en) * | 2016-02-23 | 2016-06-08 | 宝钢特钢有限公司 | Continuous casting mould fluxes for high-carbon steel |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111590043A (en) * | 2020-06-30 | 2020-08-28 | 广东韶钢松山股份有限公司 | Design method of secondary cooling water in high-carbon steel continuous casting process and continuous casting billet preparation method |
| CN113333702A (en) * | 2021-06-29 | 2021-09-03 | 广东韶钢松山股份有限公司 | High-carbon chromium bearing steel continuous casting crystallizer casting powder and application thereof |
| CN114472823A (en) * | 2021-12-29 | 2022-05-13 | 武钢中冶工业技术服务有限公司 | Crystallizer casting powder |
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