CN101347823A - Method for using double-layer continuous casting pouring box covering agent - Google Patents
Method for using double-layer continuous casting pouring box covering agent Download PDFInfo
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- CN101347823A CN101347823A CNA2008101198137A CN200810119813A CN101347823A CN 101347823 A CN101347823 A CN 101347823A CN A2008101198137 A CNA2008101198137 A CN A2008101198137A CN 200810119813 A CN200810119813 A CN 200810119813A CN 101347823 A CN101347823 A CN 101347823A
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Abstract
The invention relates to an application method of a double-layer continuous casting tundish covering agent, which belongs to the technical field of the continuous casting. The invention relates to a comprehensive using method of two covering agents when the low carbon and ultra-low carbon steel grades which have high requirements on the steel cleanliness are casted, bottom slag begins to be added after a large ladle is casted and is sufficiently added after the liquid lever of molten steel is positioned, and five minutes later, top slag is added at the temperature measuring and sampling location according to proportions; the percentages by weight between the bottom slag and the top slag are that: the top slag is 75-85 percent and the bottom slag is 15-25 percent. The invention has the advantages that the bottom slag keeps the characteristic that the high-basicity covering agent has strong absorbing and intermingling capability, at the same time, the second oxidation of the molten steel can be prevented and the carbolic content in the molten steel can be reduced; the top slag can cover the molten steel by taking a loose and porous shape, the incrusting phenomenon of the covering agent at the temperature measuring and sampling location can be improved obviously, the normal temperature measuring and sampling can be carried out and the invalidation loss caused by the incrusting of a temperature measuring head and a sampler can be reduced; the operation is simple, the covering agent of the common steel grades can be used as the bottom slag and the shell-broken operation is not carried out any more; the operational condition pollution caused by carbonizing rice huskes can be avoided.
Description
Technical field
The present invention relates to the continuous casting technology field, a kind of application process of double-layer continuous casting tundish covering flux particularly is provided, be one and optimize the performance new technology that Tundish Covering Flux for Continuous Casting is used.
Background technology
Tundish covering flux has insulation, prevents secondary oxidation of steel, absorbs the come-up field trash, stablize metallurgical function such as liquid steel level.Require the higher steel grade of molten steel cleanliness factor for mild steel, ultra-low-carbon steel etc.,, also require to prevent molten steel recarburization except emphasizing to absorb the function of field trash.
At present, a lot of steel mills adopt high basicity carbon-free covering agent to improve the ability of coverture absorption field trash and prevent molten steel recarburization [1,2].But high basicity carbon-free covering agent crusts easily, causes thermometric, sampling difficulty.For this reason, adopt the method that adds charring rice husk on high basicity carbon-free covering agent upper strata to avoid top of the slag crust problem.Though charring rice husk has heat-insulating property preferably, exist stop watering that back tundish residue is difficult for that the broken difficulty of removing, disintegrate, cylinder-packing reduce service life, slag absorbs distinct disadvantage such as the field trash ability is relatively poor in the bag.In addition, charring rice husk from not opening, flying upward easily in Argon and thermometric, the sampling process, causes the deterioration of operating environment at ladle.
Summary of the invention
The object of the present invention is to provide a kind of double-layer continuous casting tundish covering flux application process, solved that residue is difficult for that the broken difficulty of removing, disintegrate, cylinder-packing reduce service life, slag absorbs problems such as the field trash ability is relatively poor in the bag, and, optimized operating environment.
The present invention relates to the comprehensive using method of two kinds of covertures.
When the demanding steel grades of cleanliness factor such as casting low-carbon (LC), ultra-low-carbon steel, high basicity carbon-free covering agent is formed end slag, and adds the top slag at the thermometric sampling point, and other position does not add the top slag.
The concrete steps that add coverture are: begin to add end slag after watering unwrapping greatly, fill up after liquid steel level puts in place, add the top slag at the thermometric sampling point in proportion after about 5 minutes.The percentage by weight of end slag and top slag is: top slag 75-85%, end slag 15-25%.
The composition of end slag is: C:＜1.0%, CaO:35-45%, Al
2O
3: 35-40%, SiO
2: 4-7%, MgO:5-10%, R
2O:2-10%, other impurity:＜10%.The composition of top slag is: C:1-5%, CaO:30-40%, Al
2O
3: 15-25%, SiO
2: 15-25%, MgO:5-10%, R
2O:3-10%, other impurity:＜10%.Above composition all is weight percentage.
On probation showing, adopt after the above-mentioned double-deck coverture, reached following effect:
1) end slag has kept high basicity coverture to absorb and has been mingled with the strong characteristics of ability, prevents the secondary oxidation of molten steel simultaneously, prevents that the continuous casting of molten steel carbon increasing amount is excessive.
2) the top basicity of slag is lower, can be loose porous shape and cover molten steel, and thermometric sampling point coverture crust phenomenon is obviously improved, and can carry out normal thermometric sampling, has reduced the loss that temperature measuring head and sampler lost efficacy because of crust.According to statistics, the crust phenomenon causes average every stove molten steel to increase and uses 3 of temperature measuring heads, 1 of sampler.
3) easy and simple to handle, the coverture that can utilize common steel grade no longer carries out the broken shell operation as end slag.
4) shortcoming of having avoided charring rice husk to cause operating environment to worsen.
The specific embodiment
During certain casting ultra-low-carbon steel, the end slag of employing and top slag main component are respectively:
| Coverture | C | CaO | SiO 2 | MgO | TFe | Al 2O 3 | MnO | R |
| End slag | 0.74 | 37.9 | 5.2 | 6.7 | 6.1 | 36.3 | 2.8 | 7.2 |
| The top slag | 1.30 | 35.6 | 17.2 | 9.9 | 1.6 | 20.8 | 1.0 | 2.1 |
During another time casting low-carbon alloy steel, the end slag of employing and top slag main component are respectively:
| Coverture | C | CaO | SiO 2 | MgO | TFe | Al 2O 3 | MnO | R |
| End slag | 0.67 | 44.6 | 6.1 | 9.8 | 1.2 | 31.8 | 0.8 | 7.3 |
| The top slag | 1.59 | 37.7 | 21.1 | 10.6 | 2.8 | 15.4 | 1.3 | 1.8 |
The sampling of twice casting cycle thermometric is all very smooth, wherein wholely during the ultra-low-carbon steel casting waters time continuous casting link to increase the C average out to be 5ppm, has reached to prevent to increase the excessive effect of C.Simultaneously, in these two steel that water time total oxygen content all below 30ppm, coverture has effectively absorbed field trash.
The present invention has important directive significance and applied value for the enterprise of any production sheet material.Concrete using method is: begin to add end slag after watering unwrapping greatly, fill up after liquid steel level puts in place, add the top slag at the thermometric sampling point in proportion after about 5 minutes.
Claims (3)
1, a kind of application process of double-layer continuous casting tundish covering flux, the comprehensive using method that relates to two kinds of covertures, it is characterized in that, when casting low-carbon (LC), the demanding steel grade of ultra-low-carbon steel cleanliness factor, begin to add end slag after watering unwrapping greatly, liquid steel level fills up after putting in place, adds the top slag at the thermometric sampling point in proportion after 5 minutes; The percentage by weight of end slag and top slag is: top slag 75-85%, end slag 15-25%.
2, in accordance with the method for claim 1, it is characterized in that the composition of slag of the described end is C:＜1.0%, CaO:35-45%, Al
2O
3: 35-40%, SiO
2: 4-7%, MgO:5-10%, R
2O:2-10%, other impurity:＜10%, all be weight percentage.
3, in accordance with the method for claim 1, it is characterized in that the composition of described top slag is: C:1-5%, CaO:30-40%, Al
2O
3: 15-25%, SiO
2: 15-25%, MgO:5-10%, R
2O:3-10%, other impurity:＜10%, all be weight percentage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101198137A CN101347823B (en) | 2008-09-11 | 2008-09-11 | Method for using double-layer continuous casting pouring box covering agent |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101198137A CN101347823B (en) | 2008-09-11 | 2008-09-11 | Method for using double-layer continuous casting pouring box covering agent |
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| Publication Number | Publication Date |
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| CN101347823A true CN101347823A (en) | 2009-01-21 |
| CN101347823B CN101347823B (en) | 2011-01-26 |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102453784A (en) * | 2010-10-22 | 2012-05-16 | 宝山钢铁股份有限公司 | Slag capable of raising heat transfer efficiency used for melting reduction process |
| CN101844211B (en) * | 2009-03-23 | 2012-06-13 | 鞍钢股份有限公司 | Method for accurately controlling residue alkalinity of tundish in continuous-casting steel pouring process |
| CN103111592A (en) * | 2013-02-26 | 2013-05-22 | 莱芜钢铁集团有限公司 | Tundish covering agent |
| CN103372636A (en) * | 2012-04-24 | 2013-10-30 | 上海梅山钢铁股份有限公司 | Double-layer tundish covering agent for ultra-low carbon steel |
| CN104785737A (en) * | 2015-04-09 | 2015-07-22 | 山西太钢不锈钢股份有限公司 | Method for eliminating defect of metal particles on surface of continuous casting |
| CN104874755A (en) * | 2015-05-25 | 2015-09-02 | 中南大学 | Tundish covering agent used for chrome-bearing steel and application thereof |
| CN107052289A (en) * | 2017-05-09 | 2017-08-18 | 唐山不锈钢有限责任公司 | The Adding Way of the tundish covering flux poured is opened for continuous casting |
| CN107552746A (en) * | 2017-08-31 | 2018-01-09 | 赣州鼎洋贸易有限公司 | A kind of heat preserving agent for liquid steel and its insulation oxidant layer |
| CN107685140A (en) * | 2017-09-08 | 2018-02-13 | 河钢股份有限公司承德分公司 | A kind of method for reducing tundish covering flux consumption |
| CN107695311A (en) * | 2016-08-08 | 2018-02-16 | 株式会社Posco | Put into material and utilize its casting method |
| CN109454210A (en) * | 2018-12-24 | 2019-03-12 | 江苏嘉耐高温材料有限公司 | A kind of ultra-thin band double-layer tundish covering agent |
| CN111001768A (en) * | 2019-12-12 | 2020-04-14 | 首钢京唐钢铁联合有限责任公司 | Deoxidizing type covering agent and using method thereof |
| CN111001769A (en) * | 2019-12-13 | 2020-04-14 | 首钢京唐钢铁联合有限责任公司 | Tundish covering agent and using method thereof |
| CN115229139A (en) * | 2022-06-15 | 2022-10-25 | 攀钢集团攀枝花钢铁研究院有限公司 | Heavy rail steel continuous casting tundish covering agent and adding method thereof |
-
2008
- 2008-09-11 CN CN2008101198137A patent/CN101347823B/en active Active
Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101844211B (en) * | 2009-03-23 | 2012-06-13 | 鞍钢股份有限公司 | Method for accurately controlling residue alkalinity of tundish in continuous-casting steel pouring process |
| CN102453784A (en) * | 2010-10-22 | 2012-05-16 | 宝山钢铁股份有限公司 | Slag capable of raising heat transfer efficiency used for melting reduction process |
| CN102453784B (en) * | 2010-10-22 | 2013-07-17 | 宝山钢铁股份有限公司 | Slag capable of raising heat transfer efficiency used for melting reduction process |
| CN103372636A (en) * | 2012-04-24 | 2013-10-30 | 上海梅山钢铁股份有限公司 | Double-layer tundish covering agent for ultra-low carbon steel |
| CN103372636B (en) * | 2012-04-24 | 2015-06-03 | 上海梅山钢铁股份有限公司 | Double-layer tundish covering agent for ultra-low carbon steel |
| CN103111592A (en) * | 2013-02-26 | 2013-05-22 | 莱芜钢铁集团有限公司 | Tundish covering agent |
| CN104785737A (en) * | 2015-04-09 | 2015-07-22 | 山西太钢不锈钢股份有限公司 | Method for eliminating defect of metal particles on surface of continuous casting |
| CN104874755A (en) * | 2015-05-25 | 2015-09-02 | 中南大学 | Tundish covering agent used for chrome-bearing steel and application thereof |
| CN107695311A (en) * | 2016-08-08 | 2018-02-16 | 株式会社Posco | Put into material and utilize its casting method |
| CN107695311B (en) * | 2016-08-08 | 2020-05-05 | 株式会社Posco | Input material and casting method using same |
| CN107052289A (en) * | 2017-05-09 | 2017-08-18 | 唐山不锈钢有限责任公司 | The Adding Way of the tundish covering flux poured is opened for continuous casting |
| CN107052289B (en) * | 2017-05-09 | 2019-06-28 | 唐山不锈钢有限责任公司 | The Adding Way of the tundish covering flux poured is opened for continuous casting |
| CN107552746A (en) * | 2017-08-31 | 2018-01-09 | 赣州鼎洋贸易有限公司 | A kind of heat preserving agent for liquid steel and its insulation oxidant layer |
| CN107552746B (en) * | 2017-08-31 | 2020-04-07 | 赣州鼎洋贸易有限公司 | Molten steel heat-insulating agent and heat-insulating agent layer thereof |
| CN107685140A (en) * | 2017-09-08 | 2018-02-13 | 河钢股份有限公司承德分公司 | A kind of method for reducing tundish covering flux consumption |
| CN109454210A (en) * | 2018-12-24 | 2019-03-12 | 江苏嘉耐高温材料有限公司 | A kind of ultra-thin band double-layer tundish covering agent |
| CN111001768A (en) * | 2019-12-12 | 2020-04-14 | 首钢京唐钢铁联合有限责任公司 | Deoxidizing type covering agent and using method thereof |
| CN111001769A (en) * | 2019-12-13 | 2020-04-14 | 首钢京唐钢铁联合有限责任公司 | Tundish covering agent and using method thereof |
| CN111001769B (en) * | 2019-12-13 | 2022-04-26 | 首钢京唐钢铁联合有限责任公司 | Tundish covering agent and using method thereof |
| CN115229139A (en) * | 2022-06-15 | 2022-10-25 | 攀钢集团攀枝花钢铁研究院有限公司 | Heavy rail steel continuous casting tundish covering agent and adding method thereof |
| CN115229139B (en) * | 2022-06-15 | 2024-02-02 | 攀钢集团攀枝花钢铁研究院有限公司 | Heavy rail steel continuous casting tundish covering agent and adding method thereof |
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|---|---|
| CN101347823B (en) | 2011-01-26 |
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Address after: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing Patentee after: Shougang Group Co. Ltd. Address before: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing Patentee before: Capital Iron & Steel General Company |
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