CN100395364C - Method for molten steel recarburization and vanadium alloying - Google Patents
Method for molten steel recarburization and vanadium alloying Download PDFInfo
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- CN100395364C CN100395364C CNB2006100212335A CN200610021233A CN100395364C CN 100395364 C CN100395364 C CN 100395364C CN B2006100212335 A CNB2006100212335 A CN B2006100212335A CN 200610021233 A CN200610021233 A CN 200610021233A CN 100395364 C CN100395364 C CN 100395364C
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Abstract
The present invention provides a method for carburizing molten steel and alloying vanadium, which has the advantages of low cost and environmental protection. In the method, after steel is smelted from a revolving furnace, molten iron containing vanadium is added to the revolving furnace. The present invention uses a method of using the molten iron containing vanadium to carburizing molten steel and alloying vanadium to replace the traditional method for carburizing molten steel and alloying vanadium. On one hand, the present invention eliminates defects of environmental pollution caused by using carburant to carburize the molten steel, low recovery rate of carburant and unstable molten steel components; on the other hand, the vanadium in molten iron has the function of alloying vanadium in the molten steel, which can greatly reduce or completely replace the use of ferrovanadium. The molten steel produced by using the method of the present invention has stable components and high purity, which can greatly enhances smelting rate of steel and greatly lower production cost.
Description
Technical field
The invention belongs to the steel-making metallurgical technology field, the method for particularly a kind of molten steel recarburization and vanadium alloying.
Background technology
At present molten steel recarburization is all adopted carbonaceous materials such as hard coal, pitch coke, in tapping process, add molten steel, because the composition instability of carbonaceous material, the rate of recovery instability and the rate of recovery of carbon are lower, cause the molten steel composition fluctuation bigger, wayward, influence the rate that is smelt of steel grade, and the pollution molten steel of different degree, influence the purity of molten steel; On the other hand, flue dust is big when adding carburelant, also pollutes the environment.
The vanadium alloying of molten steel all adopts the method that adds FeV80 or FeV50 alloy in the tapping process, and costing an arm and a leg of ferro-vanadium is unfavorable for reducing ton steel production cost.
Summary of the invention
Technical problem to be solved by this invention provides the method to molten steel recarburization and vanadium alloying of a kind of low cost, environmental protection.
The technical scheme that technical solution problem of the present invention is adopted is: with the method for vanadium-bearing hot metal to molten steel recarburization and vanadium alloying, after the converter smelting tapping, add vanadium-bearing hot metal.
The invention has the beneficial effects as follows: the present invention carries out carburetting and vanadium alloying with vanadium-bearing hot metal to molten steel, replace the traditional molten steel recarburization and the method for vanadium alloying, eliminate molten steel on the one hand and hang down and the unsettled drawback of molten steel composition with the environmental pollution and the carburelant rate of recovery that carburelant carburetting causes; On the other hand, the vanadium in the molten iron plays the effect of vanadium alloying in molten steel, can reduce or replace fully the use of ferro-vanadium significantly.The molten steel composition that adopts the inventive method to produce is stable, and the molten steel high purity can significantly improve the rate that is smelt of steel, and reduce production costs greatly.
Embodiment
Adopt the step of the inventive method in concrete production process to be: molten iron (half steel) is earlier through converter smelting, in tapping process, add deoxygenated alloys such as Si, Mn, after treating that converter has gone out molten steel, according to tap, go out composition of steel and calculate the vanadium-bearing hot metal amount that needs add, vanadium-bearing hot metal is blended into ladle, Argon is 4～8 minutes then, carries out continuous pouring after LF temperature adjustment and RH vacuum outgas processing.
The weight percent content of endpoint molten steel preferably includes behind the above-mentioned converter smelting: C:0.05～0.20%, P≤0.015%, and terminal temperature is preferably: 1680 ℃～1700 ℃; Above-mentioned vanadium-bearing hot metal is the vanadium-bearing hot metal of desulfurization preferably; The temperature of the vanadium-bearing hot metal that the present invention adopts is best 〉=and 1280 ℃, weight percent content preferably includes: C:4.00～4.60%, V:0.28～0.35%, S≤0.010%, P≤0.080%.
Be the embodiment that adopts method production Properties of Heavy Rail Steel By of the present invention below.
Embodiment 1: production Properties of Heavy Rail Steel By U75V (weight percent content comprises: C:0.70%, V:0.06%, P≤0.025%, Si:0.60%, Mn:0.80%)
110 tons of converter tappings, weight percent content comprises: C:0.10%, V are 0, P≤0.015%, Mn:0.05%, smelting endpoint temperature: 1690 ℃.
The weight percent content of the vanadium-bearing hot metal after the desulfurization comprises: C:4.30%, V:0.30%, Si:0.20%, Mn:0.20%, P:0.080%, S＜0.010%, temperature are 1280 ℃.
Calculation of correlation is as follows:
According to the C balance: make C content reach 0.70%, the required vanadium-bearing hot metal weight of carburetting is 18.3 tons.
According to the V balance: after 18.3 tons of vanadium-bearing hot metals are blended into 110 tons of molten steel, V content reaches 0.046% in the molten steel, make V content reach 0.06%, only need add the 17.96kg vanadium, promptly only need add ferro-vanadium (FeV80) 22.45kg, save 76.61% than the 96kg of existing level.
According to the P balance: after being blended into vanadium-bearing hot metal, phosphorus raises to some extent in the molten steel, P content≤0.023% in the steel, but satisfy the requirement of P≤0.025%.
According to Si, Mn balance: can add Si36kg less during alloying, add Mn27.45kg less.
Specific implementation method is: add SiMn alloy 300kg deoxidation in tapping process, after treating that converter has gone out molten steel, after 18.3 tons of molten iron are blended into 110 tons of molten steel, the molten steel gross weight is 128.3 tons, add ferro-vanadium (FeV80) 22.45kg again, Argon is 4 minutes then, carries out continuous pouring after LF temperature adjustment and RH vacuum outgas processing.
Embodiment 2: production Properties of Heavy Rail Steel By PD3 (S) (weight percent content comprises C:0.75%, V:0.04%～0.08%, P≤0.025%, Si:0.60%, Mn:0.80%)
110 tons of converter tappings, weight percent content comprises: C:0.15%, V are 0, P≤0.015%, Mn:0.05%, smelting endpoint temperature: 1690 ℃.
The weight percent content of the vanadium-bearing hot metal after the desulfurization comprises: C:4.20%, V:0.33%, Si:0.20%, Mn:0.20%, P:0.070%, S＜0.010%, temperature are 1290 ℃.
Calculation of correlation is as follows:
According to the C balance: make C content reach 0.75%, the required vanadium-bearing hot metal weight of carburetting is 19.13 tons.
According to the V balance: after 19.13 tons of vanadium-bearing hot metals were blended into 110 tons of molten steel, V content reached 0.049% in the molten steel, satisfied V content and be 0.04～0.08% requirement, therefore can add ferro-vanadium more fully.
According to the P balance: after being blended into vanadium-bearing hot metal, phosphorus raises to some extent in the molten steel, P content≤0.023% in the steel, but satisfy the requirement of P≤0.025%.
According to Si, Mn balance: can add Si38.3kg and Mn38.3kg less during alloying.
Specific implementation method is: add BaCaSi alloy 250kg deoxidation in tapping process, after treating that converter has gone out molten steel, 19.13 tons of molten iron are blended into 110 tons of molten steel after, the molten steel gross weight is 129.13 tons, Argon is 6 minutes then, carries out continuous pouring after LF temperature adjustment and RH vacuum outgas processing.
Embodiment 3: production Properties of Heavy Rail Steel By U75V (R) (weight percent content comprises C:0.75%, V:0.04%～0.012%, P≤0.025%, Si:0.60%, Mn:0.80%)
110 tons of converter tappings, weight percent content comprises: C:0.08%, V are 0, P≤0.010%, Mn:0.05%, smelting endpoint temperature: 1690 ℃.
The weight percent content of the vanadium-bearing hot metal after the desulfurization comprises: C:4.30%, V:0.34%, Si:0.20%, Mn:0.20%, P:0.070%, S＜0.010%, temperature are 1290 ℃.
Calculation of correlation is as follows:
According to the C balance: make C content reach 0.75%, the required vanadium-bearing hot metal weight of carburetting is 20.76 tons.
According to the V balance: after 20.76 tons of vanadium-bearing hot metals were blended into 110 tons of molten steel, V content reached 0.054% in the molten steel, satisfied V content and be 0.04～0.12% requirement, need not add ferro-vanadium again.
According to the P balance: after being blended into vanadium-bearing hot metal, phosphorus raises to some extent in the molten steel, P content≤0.0195% in the steel, but satisfy the requirement of P≤0.025%.
According to Si, Mn balance: can add Si41.52kg and Mn41.52kg less during alloying.
Specific implementation method is: add BaCaSi alloy 250kg deoxidation in tapping process, after treating that converter has gone out molten steel, 20.76 tons of molten iron are blended into 110 tons of molten steel after, the molten steel gross weight is 130.76 tons, Argon is 8 minutes then, carries out continuous pouring after LF temperature adjustment and RH vacuum outgas processing.
Claims (6)
1. the method for molten steel recarburization and vanadium alloying is characterized in that: after the converter smelting tapping, add vanadium-bearing hot metal.
2. the method for molten steel recarburization as claimed in claim 1 and vanadium alloying is characterized in that: after adding vanadium-bearing hot metal, when the weight percent content of the V in the molten steel can not reach requirement, add ferro-vanadium.
3. the method for molten steel recarburization as claimed in claim 1 and vanadium alloying is characterized in that: described vanadium-bearing hot metal is the vanadium-bearing hot metal of desulfurization.
4. the method for molten steel recarburization as claimed in claim 1 and vanadium alloying is characterized in that: the weight percent content of described vanadium-bearing hot metal comprises: C:4.00～4.60%, V:0.28～0.35%, S≤0.010%, P≤0.080%.
5. the method for molten steel recarburization as claimed in claim 1 and vanadium alloying is characterized in that: the temperature of described vanadium-bearing hot metal 〉=1280 ℃.
6. the method for molten steel recarburization as claimed in claim 1 and vanadium alloying is characterized in that: the terminal temperature of described converter smelting is 1680～1700 ℃.
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| CNB2006100212335A CN100395364C (en) | 2006-06-23 | 2006-06-23 | Method for molten steel recarburization and vanadium alloying |
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| CNB2006100212335A CN100395364C (en) | 2006-06-23 | 2006-06-23 | Method for molten steel recarburization and vanadium alloying |
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| CN1884600A CN1884600A (en) | 2006-12-27 |
| CN100395364C true CN100395364C (en) | 2008-06-18 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102925616B (en) * | 2011-08-08 | 2014-10-01 | 攀钢集团有限公司 | Smelting method of vanadium-containing molten iron |
| CN102994871B (en) * | 2012-11-22 | 2014-07-02 | 河北钢铁股份有限公司承德分公司 | Method for smelting medium/high-carbon hard-wired steel by vanadium-titanium containing molten iron |
| CN105018670B (en) * | 2015-07-15 | 2017-06-16 | 攀钢集团攀枝花钢铁研究院有限公司 | The method for smelting rail steel as raw material with vanadium-bearing hot metal |
| CN108060287A (en) * | 2017-12-20 | 2018-05-22 | 新疆昆玉钢铁有限公司 | Element recoverying and utilizing method is improved in the outer mix and convert technique of molten iron line |
| CN111378807A (en) * | 2018-12-31 | 2020-07-07 | 新疆八一钢铁股份有限公司 | Method for applying molten iron as alloy material to converter steelmaking |
| CN115404311A (en) * | 2022-09-23 | 2022-11-29 | 鞍钢股份有限公司 | Control method for producing high-carbon steel with low nitrogen content |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1044127A (en) * | 1989-01-14 | 1990-07-25 | 抚顺钢厂 | The dephosphorization vanadium-main taining process of pig iron containing vanadium in electric arc furnace |
| CN1461813A (en) * | 2002-06-02 | 2003-12-17 | 承德新新钒钛股份有限公司 | Steelmaking method using molten iron as carburant |
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2006
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1044127A (en) * | 1989-01-14 | 1990-07-25 | 抚顺钢厂 | The dephosphorization vanadium-main taining process of pig iron containing vanadium in electric arc furnace |
| CN1461813A (en) * | 2002-06-02 | 2003-12-17 | 承德新新钒钛股份有限公司 | Steelmaking method using molten iron as carburant |
Non-Patent Citations (4)
| Title |
|---|
| 含钒铁水直接炼钢工艺与微钒钛钢筋. 魏明义.钢铁钒钛，第15卷第2期. 1994 |
| 含钒铁水直接炼钢工艺与微钒钛钢筋. 魏明义.钢铁钒钛，第15卷第2期. 1994 * |
| 用钒渣直接合金化在转炉冶炼06VTi钢的试验. 诸国雄等.炼钢，第2期. 1988 |
| 用钒渣直接合金化在转炉冶炼06VTi钢的试验. 诸国雄等.炼钢，第2期. 1988 * |
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