CN100560741C - A kind of refined-smelting ladle furnace calcium carbide deoxidation method - Google Patents
A kind of refined-smelting ladle furnace calcium carbide deoxidation method Download PDFInfo
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- CN100560741C CN100560741C CNB2007101580856A CN200710158085A CN100560741C CN 100560741 C CN100560741 C CN 100560741C CN B2007101580856 A CNB2007101580856 A CN B2007101580856A CN 200710158085 A CN200710158085 A CN 200710158085A CN 100560741 C CN100560741 C CN 100560741C
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- calcium carbide
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- deoxidation
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Abstract
The present invention relates to a kind of refined-smelting ladle furnace calcium carbide deoxidation method, straight carbon steel is replaced aluminium fully with calcium carbide forge.For low silicon aluminium killed steel and pipe line steel, add 0.4～0.8kg aluminium according to the slag system situation by steel per ton and forge, be to stir under the 500L/min at argon flow amount, the add-on by ton steel 0.6～1.2kg adds calcium carbide again, carries out the slag making of calcium carbide deoxidation submerged arc.Adopt the present invention, straight carbon steel ton steel can reduce about 3300 yuan of deoxidation cost; It is 5500 yuan that low silicon aluminium killed steel ton steel reduces cost.Not only reduce Al
2O
3Be mingled with pollution, form foamy slag, help the slag making of LF stove submerged arc molten steel; And can reduce noise and the thermal radiation of shielding molten steel, saves energy reduces consumption of electrode.Simultaneously, can reduce the molten aluminium of acid in the steel, reduce calcium line consumption; Reduce and to be mingled with enrichment, the generation of the flow phenomenon that effectively prevents to wad a quilt with cotton improves the inner quality of steel billet.
Description
Technical field
The invention belongs to technical field of ferrous metallurgy, is the method that a kind of ladle refining furnace (hereinafter to be referred as the LF stove) adopts calcium carbide to carry out deoxidation specifically.
Background technology
As everyone knows, aluminium is the very strong metal of a kind of reductibility, and therefore in smelting iron and steel technology, aluminium is used as a kind of strong reductor mostly and uses, and adds fine aluminium piece, aluminium forging etc. and carry out deoxidation in smelting.At present, what the production of LF stove steel was generally adopted is full aluminium deoxidation, because the price of aluminium is more expensive relatively, not only cause smelting cost to improve, and effective recovery rate of aluminium is lower.Product that the more important thing is full aluminium deoxidation is Al
2O
3, a large amount of oxide compounds enter molten steel, cause occurring in the molten steel a large amount of Al
2O
3Be mingled with, pollute molten steel, have a strong impact on the inner quality of strand.
In addition, for low silicon aluminium killed steel slag system, ideal Al
2O
3Content is 15-25%, and CaO content is 50-65%.Al in slag
2O
3After amount reached capacity, the ability that the absorption of whole slag system is mingled with just certainly will weaken, and caused to be mingled with enrichment, thereby was cast as adverse influence to watering smoothly before the machine, often formed wadding stream easily, and is serious even cause breaking and water, and causes industrial accident.
For addressing the above problem, general measure is to adopt composite deoxidant.Provide a kind of " pure aluminium iron compound deoxidant piece " as Chinese patent ZL02229604.2, adopted fine aluminium (Al＞97%) and iron compound, aluminium is reductor, and iron is as the material that increases proportion.Though the recovery rate of aluminium has improved, increased P, S to molten steel and polluted, make the impaired and reduction of steel.Number of patent application be 200310110111.X's " steel core aluminium is composite deoxidant and production technique thereof " a kind of employing electrolysis fine aluminium (Al＞99.5%) then be provided and be the composite deoxidant of base with soft steel.Although do not increase the pollution of P, S, the recovery rate of aluminium is improved.But but significantly increased production cost, and Al
2O
3Rubbish pollution molten steel and the root problem that influences the casting condition are not resolved.
Summary of the invention
Purpose of the present invention is exactly at the problems referred to above, aims to provide a kind of with low costly, simple to operate, and favourable slag making increases the ability that refining slag absorption is mingled with, and reduces Al in the steel
2O
3Be mingled with, improve the method for the LF stove calcium carbide deoxidation of the especially low silicon aluminium killed steel internal soundness of strand.
The present invention has taked following technical scheme for this reason:
Refined-smelting ladle furnace calcium carbide deoxidation method of the present invention comprises the aluminium forging, according to the steel grade difference, partly or entirely forges with the calcium carbide substitution of Al, adopts the calcium carbide deoxidation, and steel calcium carbide add-on per ton is 0.2～1.2kg.
For low silicon aluminium killed steel and pipe line steel: steel per ton adds 0.4～0.8kg aluminium to be forged, and adds 0.6～1.2kg calcium carbide again.It adds processing step:
After molten steel arrived at a station, Argon thermometric sampling in 3 minutes added 0.4～0.8kg aluminium according to the slag system situation by steel per ton and forges, and stirred under the big argon flow amount of 500L/min, and then added calcium carbide by the add-on of ton steel 0.6～1.2kg, carried out the slag making of calcium carbide deoxidation submerged arc.
For straight carbon steel: do not add aluminium and forge, replace aluminium fully with calcium carbide and forge, steel per ton adds the deoxidation of 0.2～0.6kg calcium carbide. and processing step is: after molten steel arrives at a station, Argon thermometric sampling in 3 minutes, under the big argon flow amount of 500L/min, stir, add calcium carbide by ton add-on of steel 0.2～0.6kg and get final product.
Adopt the present invention to have a series of beneficial effects:
The one, economic benefit.Calculate by market value, the price that aluminum current is forged is 15420 yuan/ton, and the unit price of calcium carbide is 4700 yuan/ton.Generally adding aluminium forging amount for straight carbon steel is 0.4kg/ ton steel, and after replacing with calcium carbide, it is about more than 3300 yuan that its ton steel can reduce the deoxidation cost.For low silicon aluminium killed steel, steel per ton can substitute 0.6kg aluminium with the 0.8kg calcium carbide and forge, and then a ton steel can reduce the deoxidation cost and is about 5500 yuan.This holds nearly hundred tons large-scale steelworks for jar, reduces cost in only this item year just will reach up to ten million units.
The 2nd, quality and benifit.The present invention adopts the calcium carbide deoxidation, and its product is CaO and CO, has not only reduced Al
2O
3Be mingled with pollution, can form foamy slag again simultaneously, help the slag making of LF stove submerged arc molten steel.So not only can reduce noise but also the thermal radiation of maskable molten steel, reduce the heated by electrodes time, saves energy, and reduce consumption of electrode simultaneously.The calcium carbide deoxidation can also reduce the molten aluminium of acid in the steel, under the condition of certain calcium aluminum ratio, is beneficial to the reduction that calcium line consumes; Especially for the steel grade that the molten aluminium requirement of acid is arranged, its composition is more easy to control, can avoid content overproof.
And, adopt the present invention not need increase equipment and investment, must more change conventional production process, simple and safe operation reduces and is mingled with enrichment, improves the casting condition, effectively prevents the generation of flow phenomenon of wadding a quilt with cotton, and has improved the inner quality of steel greatly.
Embodiment
Holding below in conjunction with jar is the specific embodiment of 100 tons of molten steel jars, and the present invention is further described.
For carbon structural steel, replace aluminium fully with calcium carbide and forge, by ton steel add-on 0.6kg, it is 60kg that 100 tons of jars add calcium carbide.After molten steel arrived at a station, Argon thermometric sampling in 3 minutes was stirred under the big argon flow amount of 500L/min, adds the calcium carbide of 60kg then, and surplus is common process.
Concerning the molten aluminium of acid has the steel grade of requirement, is that per ton steel add 0.4～0.8kg aluminium forge by standard for low silicon aluminium killed steel and pipe line steel etc., adds 0.6～1.2kg calcium carbide again.Forging because both added a part of aluminium, and added a part of calcium carbide again, generally is to take under the prerequisite that satisfies the deoxidation requirement therefore, and the aluminium of adding is forged to be increased, and then the add-on of calcium carbide is with regard to corresponding minimizing; Otherwise the aluminium that adds is forged few, and calcium carbide then increases in proportion.100 tons of its adding examples of jar: 1, aluminium is forged 40kg, calcium carbide 120kg; 2, aluminium is forged 60kg, calcium carbide 80kg; 3, aluminium is forged 80kg, calcium carbide 60kg.It adds technology:
After molten steel arrives at a station, Argon thermometric sampling in 3 minutes, the aluminium that adds embodiment 1 or 2 or 3 according to the slag system situation is forged, and is to stir under the 500L/min at argon flow amount, and then the corresponding calcium carbide that adds embodiment 1 or 2 or 3, carries out the slag making of calcium carbide deoxidation submerged arc.The surplus common process of all taking.The situation of slag system mainly is to consider the viscosity etc. of flowability, oxidisability and the slag of slag, and viscosity should not be too big, keeps more weak oxidisability; When the oxidisability of slag was more weak, its add-on also can correspondingly reduce.
Production practice show, adopt refined-smelting ladle furnace calcium carbide deoxidation method of the present invention, the up to ten million units that not only can reduce production costs every year, and technological operation tends towards stability, and the wadding flow rate obviously descends; And the sulfur print test result shows that the strand internal soundness also increases.
Claims (1)
1, a kind of refined-smelting ladle furnace calcium carbide deoxidation method is characterized in that, according to the steel grade difference, partly or entirely adopts the calcium carbide deoxidation, and its concrete grammar is:
For low silicon aluminium killed steel and pipe line steel: with aluminium forge and calcium carbide as reductor; After molten steel arrives at a station, Argon thermometric sampling in 3 minutes adds 0.4～0.8kg aluminium according to the slag system situation by steel per ton and forges, and stirs under the big argon flow amount of 500L/min, and then add calcium carbide by the add-on of steel 0.6～1.2kg per ton, carry out the slag making of calcium carbide deoxidation submerged arc;
For straight carbon steel: all adopt the calcium carbide deoxidation; After molten steel arrived at a station, Argon thermometric sampling in 3 minutes was stirred under the big argon flow amount of 500L/min, by the add-on adding calcium carbide of steel 0.2～0.6kg per ton.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101580856A CN100560741C (en) | 2007-11-12 | 2007-11-12 | A kind of refined-smelting ladle furnace calcium carbide deoxidation method |
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|---|---|---|---|
| CNB2007101580856A CN100560741C (en) | 2007-11-12 | 2007-11-12 | A kind of refined-smelting ladle furnace calcium carbide deoxidation method |
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|---|---|
| CN101157966A CN101157966A (en) | 2008-04-09 |
| CN100560741C true CN100560741C (en) | 2009-11-18 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102952923B (en) * | 2012-11-27 | 2014-11-05 | 南京钢铁股份有限公司 | Process for smelting aluminum containing steel through calcium carbide deoxidation |
| CN104789739B (en) * | 2015-03-31 | 2016-08-31 | 青岛钢铁控股集团有限责任公司 | A kind of refining process molten steel uses the smelting process of carbide deoxidation |
| CN107012297A (en) * | 2016-01-27 | 2017-08-04 | 鞍钢股份有限公司 | A kind of method of raising LF stoves heating efficiency |
| CN107794342B (en) * | 2016-09-06 | 2019-04-26 | 鞍钢股份有限公司 | A kind of method that LF refining efficiently utilizes calcium carbide |
| CN108660294B (en) * | 2018-05-31 | 2019-12-10 | 江苏省沙钢钢铁研究院有限公司 | Silicon-manganese killed non-oriented silicon steel inclusion control method |
| CN110369545A (en) * | 2019-08-27 | 2019-10-25 | 天津钢管制造有限公司 | Prevent the control method of small-bore tube inner wall convex closure |
| CN115710613B (en) * | 2022-11-25 | 2024-03-19 | 陕钢集团汉中钢铁有限责任公司 | Control method for low inclusion of silicon killed steel |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4036635A (en) * | 1975-06-18 | 1977-07-19 | Thyssen Niederrhein Ag Hutten- Und Walzwerke | Process for making a steel melt for continuous casting |
-
2007
- 2007-11-12 CN CNB2007101580856A patent/CN100560741C/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4036635A (en) * | 1975-06-18 | 1977-07-19 | Thyssen Niederrhein Ag Hutten- Und Walzwerke | Process for making a steel melt for continuous casting |
Non-Patent Citations (2)
| Title |
|---|
| 电石在生产低碳铝镇静洁净钢的应用. 刘义军，熊涛涛.炼钢，第19卷第4期. 2003 |
| 电石在生产低碳铝镇静洁净钢的应用. 刘义军，熊涛涛.炼钢，第19卷第4期. 2003 * |
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| CN101157966A (en) | 2008-04-09 |
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