CN103938069A - LF refining dephosphorization production process for low-phosphorus low-carbon steel - Google Patents
LF refining dephosphorization production process for low-phosphorus low-carbon steel Download PDFInfo
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Abstract
Belonging to the technical field of smelting processes in the metallurgical industry, the invention relates to an LF refining dephosphorization production process for low-phosphorus low-carbon steel. According to a technical scheme adopted by the invention, the product comprises the following chemical components by mass: 0.01-0.03% of C, 0.15-0.25% of Mn, less than or equal to 0.015% of S, less than or equal to 0.015% of P, less than or equal to 0.03% of Si, 0.02-0.04% of AlS, and the balance Fe and inevitable impurities. The smelting process control is as the following that: during LF refining, lime is added in two batches in terms of 400-600kg/furnace, the argon flow rate is 200-300NL/min; the LF output molten steel temperature is 1610-1630DEG C; the RH vacuum treatment cycle is 17-22min; the output molten steel temperature is 1585-1600DEG C; and the tundish molten steel temperature is 1550-1570DEG C. The production process provided by the invention effectively reduces the steelmaking cost, and improves the subsequent stamping and other deep processing performance of the product.
Description
Technical field
The present invention relates to a kind of low phosphorus and low carbon steel LF refining dephosphorization production technique, belong to metallurgy industry smelting technology technical field.
Background technology
In recent years, whole nation steel industry big area loss, a lot of local private steel look forward to strengthening on the one hand new product development dynamics, strengthen on the other hand before cost tackling key problem, particularly iron system and be effectively reduction molten iron cost, all use low grade ore in various degree, or recycling converter slag makes phosphoric circulation enrichment, causing phosphorus content in molten iron is 0.13-0.15%, high, makes to smelt low phosphorus and low carbon steel difficulty.
Central enterprise compares with the large-scale iron and steel such as Baosteel, Wuhan Iron and Steel Plant, and a lot of local private steel are looked forward to general output of steel large percentage, for high and stable yields are had relatively high expectations to life of converter; But be subject to relative converter nominal tonnage less than normal, if produce low phosphorus and low carbon steel by RH direct-furnish continuous casting, production process temperature drop is too large, converter terminal temperature is high, lining erosion is serious, affect whole STEELMAKING PRODUCTION plan, therefore need to adopt LF+RH duplex operational path to produce, but how under existing low cost, high phosphorus hot metal condition, stable exploitation low phosphorus and low carbon steel is the technique difficult problem that steel-making needs emphasis to solve.
LF refining major function is molten steel heating, desulfurization, trimming and raising Cleanliness of Molten Steel, if by system optimization production technique, exploitation LF refining dephosphorization metallurgical function, is under high phosphorus hot metal condition, the stable low phosphorus and low carbon steel of smelting provides strong technology ensuring, and strong technical support is provided.
Summary of the invention
The object of the invention is to provide a kind of low phosphorus and low carbon steel LF refining dephosphorization production technique, with LF+RH duplex operational path, produces, and by Optimization Technology, solves the problem existing in background technology.
Technical scheme of the present invention is:
A low phosphorus and low carbon steel LF refining dephosphorization production technique, commercialization composition quality per-cent: C:0.01-0.03%, Mn:0.15-0.25%, S :≤0.015%, P :≤0.015%, Si :≤0.03%, AlS:0.02-0.04%, all the other are Fe and inevitable impurity; Comprise following processing step:
(1) converter smelting
Terminal is controlled: mass percent C:0.04%～0.07%, molten steel [O] 400-700ppm, finishing slag basicity: R3.0-3.5, tapping temperature: 1645-1665 ℃;
Converter tapping does not add deoxygenated alloy material, after tapping 1/4, adds refining slag: 2-4kg/t, lime in batches: 2-4 kg/t, and the omnidistance argon bottom-blowing of tapping process stirs;
(2) LF refining
Add lime 400-600kg/ stove, add in two batches, do not add deoxygenated alloy material;
Argon flow amount: 200-300NL/min;
LF liquid steel temperature: the 1610-1630 ℃ that sets off;
Departures molten steel composition mass percent: C :≤0.06%, Mn :≤0.10%, S :≤0.012%, P :≤0.012%, Si :≤0.01%, [O] 300-500ppm, all the other are Fe and inevitable impurity;
(3) RH vacuum-treat
The vacuum-treat cycle: 17-22min;
Aluminium add-on: Al=(1.125 * [O] remnants)/η 1+[AlS] * t/ η 2.L, wherein η 1: aluminium specific absorption is 65-75%, L: the purity of aluminium, η 2:90-95%, t: molten steel amount;
Alloying: use mid-carbon fe-mn to adjust manganese content, mass percent manganese raises 0.01%, adds mid-carbon fe-mn 0.14Kg/t;
Departures liquid steel temperature: 1585-1600 ℃;
Departures molten steel chemical composition mass percent: C:0.01-0.03%, Mn:0.15-0.25%, S :≤0.015%, P :≤0.015%, Si:< 0.0.02%, AlS:0.025-0.045%, all the other are Fe and inevitable impurity;
(4) continuous casting working procedure
Middle bag temperature 1550-1570 ℃, pulling rate is 1-1.4m/min.
Described processing step (1) converter smelting, goes out Argon station molten steel composition mass percent: C:< 0.06%, Mn :≤0.10%, S :≤0.012%, P :≤0.015%, Si :≤0.01%, [O] 350-600ppm, all the other are Fe and inevitable impurity.
The invention has the beneficial effects as follows: (1) is changed the original sentence to ratio and is reduced to zero by 7.14% because phosphorus is high, effectively reduce steel-making cost; (2) improve the quality of products, estimate normal heat LF P removal rate approximately 25%, by enter the station phosphorus mass percent 0.015% of LF, calculate, on average can dephosphorization 0.004%, can effectively improve the deep processing performances such as punching press of this series products postorder.
Embodiment
Below in conjunction with accompanying drawing, by example, the invention will be further described.
embodiment 1:
A low phosphorus and low carbon steel LF refining dephosphorization production technique, 130 tons of converter tapping quantities, commercialization composition quality per-cent is: C:0.017%, Si:0.006%, Mn:0.19%, P:0.008%, S:0.01%, AL:0.03%, all the other are Fe and inevitable impurity.Comprise following processing step:
(1) converter smelting: smelting endpoint mass percent C:0.07%, molten steel [O] 468ppm;
Finishing slag basicity: R3.0-3.5, smelts the saturating slag of full range, 1661 ℃ of tapping temperatures;
Converter tapping requires " naked steel " tapping, does not add any deoxygenated alloy material; After tapping 1/4, add refining slag 300kg/ stove in batches, lime 200kg/ stove, tapping process argon bottom-blowing stirs;
Converter goes out Argon station molten steel composition mass percent: C:0.058, and Si:0.005%, Mn:0.06%, P:0.014%, S:0.011%, all the other are Fe and inevitable impurity;
(2) LF refining: LF refining adds lime 600kg/ stove, fluorite 100 kg/ stoves in two batches, does not add any deoxidation material, and argon flow amount is controlled at 200NL/min, improves de-P effect;
1621 ℃ of LF departures liquid steel temperatures, departures molten steel composition mass percent is: C:0.058%, Si:0.0049%, Mn:0.06%, P:0.009%, S:0.011%, all the other are Fe and inevitable impurity;
(3) RH vacuum-treat:
This tupe is carried out in vacuum-treat, vacuum-treat cycle 18min, circulation clean cycling time of 8min;
Alloying: adjust manganese content and use mid-carbon fe-mn, raise 0.01%Mn, add mid-carbon fe-mn 0.14Kg/t;
1595 ℃ of RH departures liquid steel temperatures, departures molten steel composition mass percent is: C:0.017%, Si:0.006%, Mn:0.19%, P:0.008%, S:0.01%, AL:0.03%, all the other are Fe and inevitable impurity;
As calculated: LF refining dephosphorization rate 32.86%.
embodiment 2
A low phosphorus and low carbon steel LF refining dephosphorization production technique, 130 tons of converter tapping quantities, commercialization composition quality per-cent is: C:0.016%, Si:0.006%, Mn:0.19%, P:0.006%, S:0.009%, AL:0.04%, all the other are Fe and inevitable impurity.Comprise following processing step:
(1) converter smelting: smelt emphasis mass percent: C0.069%, molten steel [O] 592ppm;
Finishing slag basicity: R3.0-3.5, smelts the saturating slag of full range, 1652 ℃ of tapping temperatures;
Converter tapping requires " naked steel " tapping, does not add any deoxygenated alloy material; After tapping 1/4, add refining slag 500kg/ stove in batches,, lime 300kg/ stove, tapping process argon bottom-blowing stirs;
Converter goes out Argon station molten steel composition mass percent: C:0.055%, and Si:0.008%, Mn:0.063%, P:0.012%, S:0.010%, all the other are Fe and inevitable impurity;
(2) LF refining: LF refining adds lime 550kg/ stove, fluorite 150 kg/ stoves in two batches, does not add any deoxidation material, and argon flow amount is controlled at 300NL/min, improves de-P effect;
1589 ℃ of LF departures liquid steel temperatures, departures molten steel composition mass percent is: C:0.05%, Si:0.003%, Mn:0.09%, P:0.005%, S:0.010%, all the other are Fe and inevitable impurity;
(3) RH vacuum-treat:
This tupe is carried out in vacuum-treat, vacuum-treat cycle 20min, circulation clean cycling time of 8min;
Alloying: adjust manganese content and use mid-carbon fe-mn, raise 0.01%Mn, add mid-carbon fe-mn 0.14Kg/t;
1590 ℃ of RH departures liquid steel temperatures, departures molten steel composition mass percent is: C:0.016%, Si:0.006%, Mn:0.19%, P:0.006%, S:0.009%, AL:0.04%, all the other are Fe and inevitable impurity;
As calculated: LF refining dephosphorization rate 44.44%.
embodiment 3
A low phosphorus and low carbon steel LF refining dephosphorization production technique, 130 tons of converter tapping quantities, commercialization composition quality per-cent is: C:0.017%, Si:0.005%, Mn:0.18%, P:0.008%, S:0.009%, AL:0.02%, all the other are Fe and inevitable impurity.Comprise following processing step:
(1) converter smelting: smelting endpoint mass percent C:0.055%, molten steel [O] 604ppm;
Finishing slag basicity: R3.0-3.5, smelts the saturating slag of full range, 1664 ℃ of tapping temperatures;
Converter tapping requires " naked steel " tapping, does not add any deoxygenated alloy material; After tapping 1/4, add refining slag 300kg/ stove in batches, lime 200kg/ stove, tapping process argon bottom-blowing stirs;
Converter departures molten steel composition mass percent is: C:0.049%, and Si:0.005%, Mn:0.06%, P:0.010%, S:0.011%, all the other are Fe and inevitable impurity;
(2) LF refining: LF refining adds lime 400kg/ stove, fluorite 50 kg/ stoves in two batches, does not add any deoxidation material, and argon flow amount is controlled at 250NL/min, improves de-P effect;
1628 ℃ of LF departures liquid steel temperatures, departures molten steel composition mass percent is: C:0.049%, Si:0.004%, Mn:0.05%, P:0.008%, S:0.011%, all the other are Fe and inevitable impurity;
(3) RH vacuum-treat:
This tupe is carried out in vacuum-treat, vacuum-treat cycle 18min, circulation clean cycling time of 8min;
Alloying: adjust manganese content and use mid-carbon fe-mn, raise 0.01%Mn, add mid-carbon fe-mn 0.14Kg/t;
1596 ℃ of RH departures liquid steel temperatures, departures molten steel composition mass percent is: C:0.017%, Si:0.005%, Mn:0.18%, P:0.008%, S:0.009%, AL:0.02%, all the other are Fe and inevitable impurity;
As calculated: LF refining dephosphorization rate 20%.
Claims (2)
1. a low phosphorus and low carbon steel LF refining dephosphorization production technique, is characterized in that: commercialization composition quality per-cent: C:0.01-0.03%, Mn:0.15-0.25%, S :≤0.015%, P :≤0.015%, Si :≤0.03%, AlS:0.02-0.04%, all the other are Fe and inevitable impurity; Comprise following processing step:
(1) converter smelting
Terminal is controlled: mass percent C:0.04%～0.07%, molten steel [O] 400-700ppm, finishing slag basicity: R3.0-3.5, tapping temperature: 1645-1665 ℃;
Converter tapping does not add deoxygenated alloy material, after tapping 1/4, adds refining slag: 2-4kg/t, lime in batches: 2-4 kg/t, and the omnidistance argon bottom-blowing of tapping process stirs;
(2) LF refining
Add lime 400-600kg/ stove, add in two batches, do not add deoxygenated alloy material;
Argon flow amount: 200-300NL/min;
LF liquid steel temperature: the 1610-1630 ℃ that sets off;
Departures molten steel composition mass percent: C :≤0.06%, Mn :≤0.10%, S :≤0.012%, P :≤0.012%, Si :≤0.01%, [O] 300-500ppm, all the other are Fe and inevitable impurity;
(3) RH vacuum-treat
The vacuum-treat cycle: 17-22min;
Aluminium add-on: Al=(1.125 * [O] remnants)/η 1+[AlS] * t/ η 2.L, wherein η 1: aluminium specific absorption is 65-75%, L: the purity of aluminium, η 2:90-95%, t: molten steel amount;
Alloying: use mid-carbon fe-mn to adjust manganese content, mass percent manganese raises 0.01%, adds mid-carbon fe-mn 0.14Kg/t;
Departures liquid steel temperature: 1585-1600 ℃;
Departures molten steel chemical composition mass percent: C:0.01-0.03%, Mn:0.15-0.25%, S :≤0.015%, P :≤0.015%, Si:< 0.0.02%, AlS:0.025-0.045%, all the other are Fe and inevitable impurity;
(4) continuous casting working procedure
Middle bag temperature 1550-1570 ℃, pulling rate is 1-1.4m/min.
2. low phosphorus and low carbon steel LF refining dephosphorization production technique according to claim 1, it is characterized in that: described processing step (1) converter smelting, go out Argon station molten steel composition mass percent: C:< 0.06%, Mn :≤0.10%, S :≤0.012%, P :≤0.015%, Si :≤0.01%, [O] 350-600ppm, all the other are Fe and inevitable impurity.
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| CN201410100974.7A CN103938069A (en) | 2014-03-19 | 2014-03-19 | LF refining dephosphorization production process for low-phosphorus low-carbon steel |
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| CN201410100974.7A CN103938069A (en) | 2014-03-19 | 2014-03-19 | LF refining dephosphorization production process for low-phosphorus low-carbon steel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104294147A (en) * | 2014-10-30 | 2015-01-21 | 武汉钢铁(集团)公司 | Super high strength cable steel and production method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011520040A (en) * | 2008-05-06 | 2011-07-14 | ドンブ メタル カンパニー リミテッド | Production method of extremely low carbon and extremely low phosphorus ferromanganese using ferromanganese slag |
| CN102399942A (en) * | 2010-09-16 | 2012-04-04 | 鞍钢股份有限公司 | Method of ultra-low-carbon steel dephosphorization outside furnace |
| CN102876845A (en) * | 2012-06-28 | 2013-01-16 | 辽宁天和科技股份有限公司 | Method for producing ultra-low phosphorus steel through applying pre-melting calcium ferrite to refine outside LF (Ladle Furnace) molten steel furnace |
| CN102965471A (en) * | 2011-09-02 | 2013-03-13 | 鞍钢股份有限公司 | Method of molten steel deep dephosphorization in secondary refining process |
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- 2014-03-19 CN CN201410100974.7A patent/CN103938069A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011520040A (en) * | 2008-05-06 | 2011-07-14 | ドンブ メタル カンパニー リミテッド | Production method of extremely low carbon and extremely low phosphorus ferromanganese using ferromanganese slag |
| CN102399942A (en) * | 2010-09-16 | 2012-04-04 | 鞍钢股份有限公司 | Method of ultra-low-carbon steel dephosphorization outside furnace |
| CN102965471A (en) * | 2011-09-02 | 2013-03-13 | 鞍钢股份有限公司 | Method of molten steel deep dephosphorization in secondary refining process |
| CN102876845A (en) * | 2012-06-28 | 2013-01-16 | 辽宁天和科技股份有限公司 | Method for producing ultra-low phosphorus steel through applying pre-melting calcium ferrite to refine outside LF (Ladle Furnace) molten steel furnace |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104294147A (en) * | 2014-10-30 | 2015-01-21 | 武汉钢铁(集团)公司 | Super high strength cable steel and production method thereof |
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Application publication date: 20140723 |