CN103128240A - Low carbon steel continuous casting crystallizer casting powder - Google Patents
Low carbon steel continuous casting crystallizer casting powder Download PDFInfo
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- CN103128240A CN103128240A CN2011103837283A CN201110383728A CN103128240A CN 103128240 A CN103128240 A CN 103128240A CN 2011103837283 A CN2011103837283 A CN 2011103837283A CN 201110383728 A CN201110383728 A CN 201110383728A CN 103128240 A CN103128240 A CN 103128240A
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- carbon steel
- low carbon
- continuous casting
- slag
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Abstract
The invention relates to a fusing agent for steel-making, in particular to low carbon steel continuous casting crystallizer casting powder. The low carbon steel continuous casting crystallizer casting powder mainly solves the technical problem that surface defects of a tin plate and a scouring plate cause slag entrapment during the continuous casting process. According to the technical scheme, the low carbon steel continuous casting crystallizer casting powder comprises 40-44 percents silicon dioxide, 28.5-36.5 percents calcium, 7.0-11.0 percents cerium trioxide, 3.6-8.2 percents lithium peroxide, <=2.4 percents sodium oxide and 4.0-8.0 percents fluorine. The low carbon steel continuous casting crystallizer casting powder is low in binary basicity and melting point, and high in viscosity. Meanwhile, lubricating of the casting powder is improved and surface tension of the casting powder is improved.
Description
Technical field
The present invention relates to make steel flux used, particularly mild steel continuous crystallizer protecting slag.
Background technology
Steel-making continuous casting covering slag used is as the medium of crystallizer and the interphase interaction of base shell; its effect is to form stable between crystallizer and base shell and uniform melt cinder film, and the improvement of its physical and chemical performance is a key technology that realizes high efficiency continuous casting and improving product surface quality.In the mild steel cold-rolled products, hole defect often appears at present; its main reason is because the defectives such as the subsurface inclusion in strand, slag, face crack cause substrate regional area weakening strength; the hole that forms in the operation of rolling, and the improvement of steel-making continuous casting mold flux property used is conducive to overcome this defective.
Find by retrieval Patents document, name be called protective cinder for special-shaped blank continuous casting (application number: CN200610039539.3), Al in this covering slag
2O
3Content is higher, but this covering slag practical function is to reduce the shaped blank surface longitudinal crack, and this just requires covering slag to have lubricity and filling capacity preferably preferably, in order to realize this function, has added a certain amount of Na in covering slag
2O reduces the interfacial tension of covering slag, reaches low melting point and the low viscous physical property of covering slag.
Summary of the invention
Purpose of the present invention proposes a kind of low carbon steel crystallizer protective slag, mainly solves the technical problem that tin plate, acid-cleaning plate blemish cause the casting process slag, and this just requires the covering slag melt cinder to have higher surface tension, therefore will control the Na in covering slag
2O content is a lower scope, after deliberation by adding a certain amount of Li
2O realizes the function that covering slag is lubricated, thereby obtains the low melting point covering slag; And overcoming the method that tradition adds alundum (Al2O3) aspect raising viscosity, and easily cause steel inclusion to increase because add alundum (Al2O3), affect the quality of steel, the present invention adopts rare earth oxide cerium sesquioxide (Ce after deliberation
2O
3) not only solved the raising viscosity problem but also do not increased field trash in steel.
Technical scheme of the present invention: a kind of mild steel continuous crystallizer protecting slag, the percentage by weight of its constituent is: SiO
240 ~ 44%, CaO 28.5～36.5%, Ce
2O
37.0～11.0%, Li
2O 3.6 ~ 8.2%, Na
2O≤2.4%, F 4.0～8.0%.
The viscosity (miscella with different viscosities is simulated) of finding covering slag by the experiment of water mould increases, and the slag number of times reduces, and production practices also prove selects full-bodied covering slag also can greatly reduce the blemish of cold-rolled steel sheet.Yet when covering slag viscosity increased, the covering slag consumption can reduce, and will make the lubricant effect wretched insufficiency, other problem can occur, as disconnected in continuous casting watering.In order to solve simultaneously the problem of this two aspect, need to be from improving the work that conducts a research of covering slag greasy property aspect, the present invention has attracted Li
2O。Add a certain amount of Li in slag
2O can reduce the fusion temperature of covering slag, improves the greasy property of covering slag.Li
2O is a kind of strong flux, and fusion temperature is had larger impact, and its ability that reduces fusion temperature is better than Na
2O, B
2O
3, CaF
2Deng.
Control a certain amount of CaO, SiO
2, the crystallization ratio of the setting temperature of favourable reduction covering slag and slag film, the lubricating function of enhancing liquid slag film improves meniscus and conducts heat, and also keeps simultaneously lower dual alkalinity (R=CaO/SiO
2), improve melt cinder and flow into condition, increase the covering slag consumption.
Add higher Ce in slag system
2O
3Content is conducive to improve covering slag viscosity.Viscosity coefficient of dross is with Ce
2O
3Content increases and raises, and higher viscosity can reduce the generation of slag circle, reduces the probability of casting process crystallizer slag, thereby improves the coiled sheet surface quality.
In covering slag, C content is controlled at suitable scope.Carbonaceous material in covering slag has a great impact its molten speed.Add the carbon content in slag more, the fusing amount of covering slag is less, and burn-off rate is slower.And molten speed is to estimate the important parameter that covering slag is supplied with the melt cinder ability; Consumption is for the lubricated very valuable parameter that provides is provided.
Effect of the present invention is: the covering slag that the present invention obtains has lower dual alkalinity, fusing point and higher viscosity can improve the lubricated of covering slag simultaneously; improve the surface tension of covering slag; reduced the occurrence probability of covering slag slag in crystallizer, thoroughly solved and often occur hole defect in the mild steel cold-rolled products.Covering slag physical property of the present invention is that fusing point (hemisphere point temperature) is 1010～1070 ℃; Molten speed is 19～35S; The viscosity of 1300 ℃ is 0.21～0.41 PaS.
The specific embodiment
Five embodiment see the following form:
| ? | SiO 2% | CaO% | Ce 2O 3% | Li 2O% | Na 2O% | F% |
| Composition | 40~44 | 28.5~36.5 | 7~11 | 3.6~8.2 | ≤2.4 | 4.0～8.0 |
| Example 1 | 43.86 | 33.36 | 9.2 | 3.84 | 2.34 | 7.4 |
| Example 2 | 40 | 36．5 | 10 | 7 | 1．5 | 5 |
| Example 3 | 42 | 34．5 | 7 | 8．2 | 0.3 | 8 |
| Example 4 | 44 | 28.6 | 11 | 6 | 2．4 | 8 |
| Example 5 | 44 | 36 | 11 | 3．6 | 1．4 | 4 |
Embodiment is at the zinc-plated slab of slab caster upper, and the cast section is 210mm*900～1100mm, and pulling rate is 0.9m/min～1.7m/min, average slag consumption 0.48Kg/ ton steel, liquid slag layer thickness 10 ~ 12mm.The result of the test surface, this cold-rolled low carbon steel crystallizer protecting residue spreadability is good, smog is few, adds covering slag post crystallization device top of the slag slag all right, do not bond, the balling-up of not crusting, the slag bar is little, the surperficial zero defect of the cold-rolled steel sheet of this steel grade.Covering slag physical property of the present invention is that fusing point (hemisphere point temperature) is 1010～1070 ℃; Molten speed is 19～35S; The viscosity of 1300 ℃ is 0.21～0.41 PaS.
Claims (1)
1. mild steel continuous crystallizer protecting slag, the percentage by weight of its constituent is: SiO
240 ~ 44%, CaO 28.5～36.5%, Ce
2O
37.0～11.0%, Li
2O 3.6 ~ 8.2%, Na
2O≤2.4%, F 4.0～8.0%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110383728.3A CN103128240B (en) | 2011-11-28 | 2011-11-28 | Low carbon steel continuous casting crystallizer casting powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110383728.3A CN103128240B (en) | 2011-11-28 | 2011-11-28 | Low carbon steel continuous casting crystallizer casting powder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103128240A true CN103128240A (en) | 2013-06-05 |
| CN103128240B CN103128240B (en) | 2015-06-03 |
Family
ID=48489054
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110383728.3A Active CN103128240B (en) | 2011-11-28 | 2011-11-28 | Low carbon steel continuous casting crystallizer casting powder |
Country Status (1)
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| CN (1) | CN103128240B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104226947A (en) * | 2013-06-17 | 2014-12-24 | 上海梅山钢铁股份有限公司 | Tundish covering agent for ultra-low-carbon steel |
| CN104550797A (en) * | 2015-01-13 | 2015-04-29 | 东北大学 | Hyporeactive crystallizer casting powder for rear earth steel continuous casting |
| CN106041006A (en) * | 2016-08-10 | 2016-10-26 | 中南大学 | Continuous casting tundish covering agent of Mn-containing and Al-containing steel and application thereof |
| CN109382489A (en) * | 2017-08-10 | 2019-02-26 | 上海梅山钢铁股份有限公司 | A kind of carbon aluminium-killed steel crystallizer protecting residue |
| CN115026249A (en) * | 2022-05-23 | 2022-09-09 | 首钢京唐钢铁联合有限责任公司 | Covering slag for producing sheet billet high-drawing-speed low-carbon steel and preparation method thereof |
Citations (5)
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| JPH09164460A (en) * | 1995-12-15 | 1997-06-24 | Nkk Corp | Powdery pre-melt flux for continuous casting of steel |
| JP2003181607A (en) * | 2001-12-12 | 2003-07-02 | Nippon Steel Metal Prod Co Ltd | MOLD FLUX FOR CONTINUOUSLY CASTING STEEL HAVING HIGH Al CONTENT |
| CN101530896A (en) * | 2008-03-14 | 2009-09-16 | 宝山钢铁股份有限公司 | High casting speed continuous casting covering slag used for ultra-low-carbon steel |
| CN102019382A (en) * | 2009-09-23 | 2011-04-20 | 宝山钢铁股份有限公司 | Low-sodium high-viscosity tin plate mold flux |
| CN102218514A (en) * | 2011-07-26 | 2011-10-19 | 攀钢集团有限公司 | Medium and low carbon steel continuous casting mold powder as well as preparation method thereof and continuous casting method |
-
2011
- 2011-11-28 CN CN201110383728.3A patent/CN103128240B/en active Active
Patent Citations (5)
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|---|---|---|---|---|
| JPH09164460A (en) * | 1995-12-15 | 1997-06-24 | Nkk Corp | Powdery pre-melt flux for continuous casting of steel |
| JP2003181607A (en) * | 2001-12-12 | 2003-07-02 | Nippon Steel Metal Prod Co Ltd | MOLD FLUX FOR CONTINUOUSLY CASTING STEEL HAVING HIGH Al CONTENT |
| CN101530896A (en) * | 2008-03-14 | 2009-09-16 | 宝山钢铁股份有限公司 | High casting speed continuous casting covering slag used for ultra-low-carbon steel |
| CN102019382A (en) * | 2009-09-23 | 2011-04-20 | 宝山钢铁股份有限公司 | Low-sodium high-viscosity tin plate mold flux |
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Non-Patent Citations (2)
| Title |
|---|
| MATHEANIEL M.ANACLETO, ET AL.: "Sulphur Partition between CaO-SiO2-Ce2O3 slags and carbon-saturated iron", 《ISIJ INTERNATIONAL》, vol. 33, no. 5, 31 December 1993 (1993-12-31), pages 549 - 555 * |
| 王德永等: "稀土氧化物对连铸保护渣粘度的影响", 《中国稀土学报》, vol. 23, no. 1, 28 February 2005 (2005-02-28) * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104226947A (en) * | 2013-06-17 | 2014-12-24 | 上海梅山钢铁股份有限公司 | Tundish covering agent for ultra-low-carbon steel |
| CN104226947B (en) * | 2013-06-17 | 2016-08-17 | 上海梅山钢铁股份有限公司 | A kind of tundish covering flux used for ultra-low-carbon steel |
| CN104550797A (en) * | 2015-01-13 | 2015-04-29 | 东北大学 | Hyporeactive crystallizer casting powder for rear earth steel continuous casting |
| CN104550797B (en) * | 2015-01-13 | 2016-08-31 | 东北大学 | A kind of hypoergia crystallizer protecting residue of rare earth steel continuous casting |
| CN106041006A (en) * | 2016-08-10 | 2016-10-26 | 中南大学 | Continuous casting tundish covering agent of Mn-containing and Al-containing steel and application thereof |
| CN109382489A (en) * | 2017-08-10 | 2019-02-26 | 上海梅山钢铁股份有限公司 | A kind of carbon aluminium-killed steel crystallizer protecting residue |
| CN115026249A (en) * | 2022-05-23 | 2022-09-09 | 首钢京唐钢铁联合有限责任公司 | Covering slag for producing sheet billet high-drawing-speed low-carbon steel and preparation method thereof |
| CN115026249B (en) * | 2022-05-23 | 2024-02-09 | 首钢京唐钢铁联合有限责任公司 | Covering slag for producing low-carbon steel with high pulling speed of sheet billet and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103128240B (en) | 2015-06-03 |
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