CN107475485B - The control method of the narrow ingredient of LF refining automobile steel alloy - Google Patents
The control method of the narrow ingredient of LF refining automobile steel alloy Download PDFInfo
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- CN107475485B CN107475485B CN201710666752.5A CN201710666752A CN107475485B CN 107475485 B CN107475485 B CN 107475485B CN 201710666752 A CN201710666752 A CN 201710666752A CN 107475485 B CN107475485 B CN 107475485B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/076—Use of slags or fluxes as treating agents
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/072—Treatment with gases
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses a kind of control method of narrow ingredient of LF refining automobile steel alloy, this method techniques are as follows: big packet Composition Control after Converter: C is controlled according between (ingredient lower limit -0.02%)~(ingredient lower limit)；Mn is controlled according between (ingredient lower limit -0.10%)~(ingredient lower limit)；Als is controlled according between (ingredient lower limit)~(ingredient lower limit+200ppm)；The control of P requires the quantity of slag under converter strict control, prevents to refine outbound-refining and enters the station the heat of rephosphorization >=0.002%；Nb is controlled according between (ingredient lower limit)~(ingredient lower limit+0.002%).This method effectively improves the qualification rate of Narrow Composition Control, improves the control of automobile steel production process, reduces influence of the technological fluctuation to product quality；The narrow ingredient hit rate control 100% of alloy, reduces cost of making steel alloy；The present invention has prevented the fluctuation of end properties, ensure that the stabilization of plate property, improves stable product quality, improves the quality in kind of product.
Description
Technical field
The present invention relates to a kind of smelting process, especially a kind of control method of the narrow ingredient of LF refining automobile steel alloy.
Background technique
The important function of LF refining is that it can carry out the adjustment of alloying ingredient in other words to molten steel, it is ensured that ladle reaches
With qualified molten steel component when continuous-casting steel pouring.The alloying of molten steel is a more complicated process, it is not only related to steel
Quality, alloy material consumption, and be related to heating molten steel temperature schedule.Preferably it is accurately determined the addition type of alloy
And additional amount, it is the important measures for obtaining high-quality steel, reaching energy-saving purpose.
Automobile steel, user are very high to plate shape and surface quality requirements, and main body production unit generally presses " zero " defect control
System.Automobile steel carbon, manganese and the other trace alloying element content close limit control abilities produced at present is lower, and alloying component contains
Amount fluctuation is relatively large, and automobile steel is the problem of occasionally there are stamping crackings for user's use process.Therefore, to respond actively sternness
Market Situation, steel mill needs to reduce cost of alloy, and stability contorting end properties are made steel execute-in-place technique by innovation, changed
It is into a series of effective live smelting operation methods of LF refining, ingredient carbon, manganese, silicon and other trace alloying elements is stringent
Control is in the range of comparing " narrow ", in the hope of achieving the purpose that Improving The Quality of Products.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of controls of the good narrow ingredient of LF refining automobile steel alloy of effect
Method.
In order to solve the above technical problems, method and process adopted by the present invention are as follows: (1) big packet Composition Control after Converter: C
It is controlled according between (ingredient lower limit -0.02%)~(ingredient lower limit)；Mn is according to (ingredient lower limit -0.10%)~(ingredient lower limit)
Between control；Als is controlled according between (ingredient lower limit)~(ingredient lower limit+200ppm)；The lower quantity of slag is controlled, so as to refine out
Stand-refining enters the station rephosphorization < 0.002%；Nb is controlled according between (ingredient lower limit)~(ingredient lower limit+0.002%)；
(2) LF enter the station molten steel carry out survey slag thickness operation, by the Hui Meng of following pairs of liquid steel refining processes, return silicon amount survey
Calculate: when 20mm≤slag thickness < 40mm, LF refining process returns Mn 0.01~0.02%, returns Si 0.005~0.01%；40mm≤slag is thick
When < 90mm, LF refining process returns Mn 0.022~0.042%, returns Si 0.011~0.018%；When 90mm≤slag thickness < 100mm,
LF refining process returns Mn 0.044~0.048%, returns Si 0.019~0.022%；When slag thickness >=100mm, LF refining process returns Mn
0.05~0.07%, Si 0.023~0.03% is returned；
(3) molten steel charge weight: ladle packet age≤10 furnaces, charge weight 158+2t is adjusted according to ladle packet age；Ladle packet age 11
~20 furnaces, charge weight 160+2t；21~30 furnace of ladle packet age, charge weight 162+2t；31~60 furnace of ladle packet age, charge weight 166+
2t；Ladle packet age >=61 furnaces, charge weight 170+2t；After tapping steel slag liquid level to the Steel ladle clearance stability contorting on packet edge 300~
500mm:
(4) after the molten steel enters the station, refining process once to electricity heat up deoxidation operation after and every time be added alloy after,
It is stirred using argon gas；
(5) white slag refines during smelting molten steel, then adds alloying element；
(6) if any alloying component lower than target lower limit 0.10% or more and meanwhile enter the station slag thickness≤20mm when, LF enters the station steel
Water first mends alloying component to target lower limit, is finely adjusted ingredient again after steel sample analysis result comes out；If any alloying component is low
In target lower limit and when 0.10%, slag thickness > 20mm simultaneously is not achieved with the gap of lower limit, alloying component is first mended to target lower limit-
0.03%；In other situations, at LF refining station, the first steel sample analysis result mends alloying component to target lower limit before coming out；
(7) when liquid steel temperature reaches target value, S content reaches ingredient and wants in the good white slag formation of steel slag deoxidation and steel
It asks, the microalloy ingredient of 1~2 minute fine tuning titanium, boron and antimony before hello calcium line progress Calcium treatment, argon gas is weak to blow flow control 150
~300NL/min.
In step (4) of the present invention, molten steel enter the station after with 2~3min of flow 600~800NL/min argon gas strong mixing after
Take steel sample；Refining process once give electricity heating deoxidation operation after with 4~5min of flow 600~1000NL/min argon gas strong mixing after
Take steel sample；It is added after alloy to take steel sample after 1.5~3min of flow 800~1000NL/min argon gas strong mixing every time.
In step (6) of the present invention, the refined molten steel argon gas that enters the station stirs and takes steel sample in 2~3 minutes.
The beneficial effects of adopting the technical scheme are that the present invention effectively improve automobile steel alloy it is narrow at
The qualification rate of sub-control runs business into strong one for steel-making upgrading and lays a solid foundation；The control of automobile steel production process is improved, is reduced
Influence of the technological fluctuation to product quality；The narrow ingredient hit rate control 100% of alloy, reduces cost of making steel alloy；Present invention Du
The fluctuation of end properties absolutely, ensure that the stabilization of plate property, improves stable product quality, improve product
Quality in kind improves product wound efficiency power.
Specific embodiment
The present invention will be further described in detail with reference to the specific embodiments.
The control method of the narrow ingredient of this LF refining automobile steel alloy is suitable for the beam steel of vehicle beam and stringer
The steel series such as 420L, 510L and for base plate reinforcing rods, the fixed structural member in chassis, automobile interiors part low-alloy
High-strength automobile steel；Using following methods technique: (1) improve big packet Composition Control after Converter: automobile steel C is according to (ingredient lower limit-
0.02%) it is controlled between~(ingredient lower limit)；Mn is controlled according between (ingredient lower limit -0.10%)~(ingredient lower limit)；In steel
Als is controlled according between (ingredient lower limit)~(ingredient lower limit+200ppm)；The control of P requires the quantity of slag under converter strict control, Du
Outbound-refining is refined absolutely to enter the station the heat of rephosphorization >=0.002%；Nb is according between (ingredient lower limit)~(ingredient lower limit+0.002%)
Control.
To control the lower quantity of slag, prevents to refine outbound-refining and enter the station the heat of rephosphorization >=0.002%, converter is using slide plate method gear
Slag tapping technique.When converter smelting terminates tapping, gate valve is opened, and when converter inclining is to 90~110 °, tapping terminates, under infrared
Closing gate valve instruction is issued to gate valve mechanism after slag detector test to steel slag, gate valve is closed, and ladle roughing slag amount can under Converter
Control is in≤3.5kg/t steel.
(2) the LF molten steel that enters the station carries out surveying the operation of slag thickness, to the Hui Meng of liquid steel refining process, returns silicon amount and carries out measuring and calculating: converter
Bad slag is controlled in tapping process alloy range is crossed to LF add especially manganese element with addition of causing difficulty.To LF enter the station molten steel carry out
The operation of slag thickness is surveyed, measuring and calculating is carried out to the Hui Meng of liquid steel refining process, time silicon amount.When 20mm≤slag thickness < 40mm, LF refining process
It returns Mn 0.01~0.02%, return Si 0.005~0.01%；When 40mm≤slag thickness < 90mm, LF refining process time Mn 0.022~
0.042%, Si 0.011~0.018% is returned；When 90mm≤slag thickness < 100mm, LF refining process is returned Mn 0.044~0.048%, is returned
Si 0.019~0.022%；When slag thickness >=100mm, LF refining process returns Mn 0.05~0.07%, returns Si 0.023~0.03%；
It according to the Hui Meng of slag thickness measuring and calculating, returns silicon amount and LF and enters the station steel sample ingredient, refining work according to target adjusts Si, Mn alloy
When ingredient, accurate dosing is calculated automatically with alloy computational chart, it is ensured that narrow composition range hit rate in view of Hui Meng, time silicon amount.
(3) it improves converter and is packed into system, charge weight is adjusted according to ladle packet age, ladle of the steel slag liquid level to packet edge after tapping
Headroom stability contorting is in 300~500mm: molten steel amount is affected for the stability contorting of alloying component, improves converter and is packed into system
Degree adjusts charge weight according to ladle packet age, as shown in table 1；The Steel ladle clearance stability contorting on steel slag liquid level to packet edge exists after tapping
300~500mm；Ingredient work controls alloying component according to corresponding charge weight of different packet ages.The domestic refining for smelting automobile steel at present
Steel mill's BOF nominal capacity is mainly 120t, 150t, 180t, 200t, 300t；Table 1 is different BOF nominal capacities according to ladle
Wrap age corresponding charge weight.
Table 1: ladle packet age corresponding charge weight
(4) molten steel will stir evenly, it is ensured that the stability of molten steel component: 600~800NL/ of flow control after molten steel enters the station
Steel sample is taken after 2~3min of min argon gas strong mixing；Refining process once give electricity heating deoxidation operation after flow control 600~
Steel sample is taken after 4~5min of 1000NL/min argon gas strong mixing；Argon flow controls 800~1000NL/min after alloy is added every time
Steel sample is taken after 1.5~3min of argon gas strong mixing, guarantee takes steel sample ingredient uniform every time, and it is micro- to carry out alloy according to steel sample result of laboratory test
It adjusts.
(5) add alloying element under the premise of steel slag deoxidation is good: white slag refines during smelting molten steel, i.e., in slag not
Steady oxide content is minimum, and final deoxidizing is complete, and FeO+MnO≤1.0% in slag, refining slag is white, before deoxygenation of liquid steel is good
It puts and adds alloying element, it is ensured that alloy stability contorting.
(6) refining process adjustment alloying component referring to be bundled into point greatly, enter the station slag thickness situation, it is ensured that alloy composition is according to target controlled
System: refined molten steel enters the station argon gas strong mixing 2~3 minutes and takes steel sample, after heating up for the first time to electricity, chemically examines ingredient according to the first steel sample
To molten steel alloying component according to the control of steel grades lower limit is smelted, steel sample is taken, alloying component is carried out based on the analysis results and is fine-tuning to
Target.After the big ladle analysis result of molten steel converter is supplied to LF refining, if silicon, manganese and any one ingredient of other alloying components are tight
Enter the station simultaneously lower than (be lower than 0.10% or more target lower limit) of target lower limit again slag thickness≤20mm when, LF enters the station molten steel can be first
Alloying component is mended to target lower limit, is finely adjusted ingredient again after steel sample analysis result comes out；If silicon, manganese and other alloying components
Any one ingredient can first mend alloy lower than target lower limit and when 0.10%, simultaneously slag thickness > 20mm is not achieved with the gap of lower limit
For ingredient to target lower limit -0.03%, anti-non-return Si, Mn amount exceeds estimated range, causes fine tuning beyond narrow component target range；Its
Its heat mends alloying component to target lower limit before LF refining station the first steel sample analysis result comes out.Finely tune Si, Mn and its
When its alloying component, work is refined according to steel sample result of laboratory test and calculates accurate dosing automatically with alloy computational chart, guarantees narrow ingredient model
Enclose hit rate.
(7) opportunity is added in control microalloy ingredient, it is ensured that absorptivity: titanium, boron, antimony belong to oxidizable element, ferrotianium, boron
Iron, metallic antimony are added in LF refining process, and when liquid steel temperature reaches target value, the good white slag of steel slag deoxidation is formed and S in steel
Content reaches component requirements, and microalloys ingredient, the argon gas such as 1~2 minute fine tuning titanium, boron, antimony are weak before hello calcium line progress Calcium treatment
Blow 150~300 NL/min of flow control.Improve micro precious alloy recovery rate and hit rate, guarantee trace alloying element at
Divide stability contorting.
(8) after using above-mentioned technique, the alloy Narrow Composition Control result of this method are as follows: the requirement of Mn Narrow Composition Control, at
Partial objectives for ± 0.02%；The requirement of Si Narrow Composition Control, component target ± 0.01%；The requirement of Als Narrow Composition Control, component target ±
25ppm；The control of the micro constitutents such as Nb, Ti requires, component target ± 0.001%.
Embodiment 1-8: the control method of the narrow ingredient of this LF refining automobile steel alloy uses following concrete technologies.
(1) steel grade of embodiment 1,2 is 420L steel, and main chemical compositions require and target component is shown in Table 2；Embodiment
3,4 steel grade is 510L steel, and main chemical compositions require and target component is shown in Table 3；The steel grade of embodiment 5,6 is
SAPH440 steel, main chemical compositions require and target component is shown in Table 4；The steel grade of embodiment 7,8 is QStE420-1 steel,
Main chemical compositions require and target component is shown in Table 5.
Table 2: the main chemical compositions % of the 420L
Table 3: the main chemical compositions % of the 510L
Table 4: the main chemical compositions % of the SAPH440
Table 5: the main chemical compositions % of the QStE420-1
(2) technical process:
A, big packet Composition Control after Converter: big packet Composition Control the results are shown in Table 6 after each embodiment Converter.
Table 6: point (wt) is bundled into after each embodiment Converter greatly
B, survey the operation of slag thickness: each embodiment LF molten steel that enters the station survey the operation of slag thickness, surveyed slag thickness and Hui Meng, time silicon amount
Measuring and calculating value is shown in Table 7.
Table 7: slag thickness and Hui Meng, the measuring and calculating value for returning silicon amount
C, 150t converter, the charge weight and steel for wrapping age, molten steel of each used ladle of embodiment molten steel charge weight: are used
The Steel ladle clearance on slag liquid face to packet edge is shown in Table 8.
Table 8: the packet age of each embodiment and charge weight
D, argon gas stirring strategy: refining process is once given after electricity heating deoxidation operation and after alloy is added every time, adopts
It is stirred with argon gas, specific process parameter is shown in Table 9.
Table 9: argon gas mixing parametric
E, ingredient is finely adjusted by above-mentioned steps (6), the refined molten steel argon gas that enters the station stirs 2~3 minutes and takes steel sample；Work as molten steel
Temperature reaches target value, and the good white slag of steel slag deoxidation is formed and S content reaches component requirements in steel, feeds calcium line and carries out Calcium treatment
The microalloy ingredient of first 1~2 minute fine tuning titanium, boron and antimony, argon gas is weak to blow 150~300NL/min of flow control；Design parameter
It is shown in Table 10.
Table 10: fine tuning composition parameter
(3) concrete content of main component is as shown in table 11 in refined alloy obtained by each embodiment.
Table 11: each embodiment product Contents of Main Components (wt%)
Actual production statistics: certain steel mill use the narrow ingredient of this LF refining automobile steel alloy control method, from 2016 with
To refine 2680 furnace of automobile steel, alloy " narrow " ingredient hit rate control 100%, manganese, silicon and other alloying component process control energy
Power Cpk reaches 1.30, ensure that the stabilization of plate property, improves stable product quality, improves the quality in kind of product,
Improve product wound efficiency power.
Claims (3)
1. a kind of control method of the narrow ingredient of LF refining automobile steel alloy, which is characterized in that this method technique are as follows: (1) Converter
Big packet Composition Control afterwards: C is controlled according between (ingredient lower limit -0.02%)~(ingredient lower limit)；Mn is according to (ingredient lower limit-
0.10%) it is controlled between~(ingredient lower limit)；Als is controlled according between (ingredient lower limit)~(ingredient lower limit+200ppm)；Control
Make the lower quantity of slag so that refining it is outbound-refining enters the station rephosphorization < 0.002%；Nb according to (ingredient lower limit)~(ingredient lower limit+
0.002%) it is controlled between；
(2) LF enter the station molten steel carry out survey slag thickness operation, by the Hui Meng of following pairs of liquid steel refining processes, return silicon amount calculate:
When 20mm≤slag thickness < 40mm, LF refining process returns Mn 0.01~0.02%, returns Si 0.005~0.01%；40mm≤slag thickness <
When 90mm, LF refining process returns Mn 0.022~0.042%, returns Si 0.011~0.018%；When 90mm≤slag thickness < 100mm, LF
Refining process returns Mn 0.044~0.048%, returns Si 0.019~0.022%；When slag thickness >=100mm, LF refining process returns Mn
0.05~0.07%, Si 0.023~0.03% is returned；
(3) molten steel charge weight: ladle packet age≤10 furnaces, charge weight 158+2t is adjusted according to ladle packet age；Ladle packet age 11~20
Furnace, charge weight 160+2t；21~30 furnace of ladle packet age, charge weight 162+2t；31~60 furnace of ladle packet age, charge weight 166+2t；
Ladle packet age >=61 furnaces, charge weight 170+2t；After tapping steel slag liquid level to the Steel ladle clearance stability contorting on packet edge 300~
500mm:
(4) after the molten steel enters the station, refining process once to electricity heat up deoxidation operation after and every time be added alloy after, be all made of
Argon gas is stirred；
(5) white slag refines during smelting molten steel, then adds alloying element；
(6) if any alloying component enters the station simultaneously lower than target lower limit 0.10% or more when slag thickness≤20mm, the LF molten steel that enters the station is first
Alloying component is mended to target lower limit, is finely adjusted ingredient again after steel sample analysis result comes out；If any alloying component is lower than mesh
When marking lower limit and 0.10%, simultaneously slag thickness > 20mm is not achieved with the gap of lower limit, alloying component is first mended to target lower limit-
0.03%；In other situations, at LF refining station, the first steel sample analysis result mends alloying component to target lower limit before coming out；
(7) when liquid steel temperature reaches target value, the good white slag of steel slag deoxidation is formed and S content reaches component requirements in steel, feeds
Calcium line carries out the microalloy ingredient of 1~2 minute fine tuning titanium before Calcium treatment, boron and antimony, argon gas is weak blow flow control 150~
300NL/min。
2. the control method of the narrow ingredient of LF refining automobile steel alloy according to claim 1, it is characterised in that: the step
(4) in, molten steel enter the station after to take steel sample after 2~3min of flow 600~800NL/min argon gas strong mixing；Refining process is once given
To take steel sample after 4~5min of flow 600~1000NL/min argon gas strong mixing after electricity heating deoxidation operation；After alloy is added every time
To take steel sample after 1.5~3min of flow 800~1000NL/min argon gas strong mixing.
3. the control method of the narrow ingredient of LF refining automobile steel alloy according to claim 1 or 2, it is characterised in that: described
In step (6), the refined molten steel argon gas that enters the station stirs and takes steel sample in 2~3 minutes.
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| CN114875296A (en) * | 2022-04-27 | 2022-08-09 | 青海西钢特殊钢科技开发有限公司 | Method for narrow control of chemical components in smelting process |
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| CN102071359A (en) * | 2011-01-27 | 2011-05-25 | 河北钢铁股份有限公司唐山分公司 | Ultra-high-intensity automobile structural steel and production method thereof |
| KR20110059441A (en) * | 2009-11-27 | 2011-06-02 | 현대제철 주식회사 | Vaccum refining method of ultra low carbon steel |
| CN102936636A (en) * | 2012-11-16 | 2013-02-20 | 内蒙古包钢钢联股份有限公司 | Method for manufacturing medium-carbon low-alloy steel TDC66T-1 containing boron |
| CN106978571A (en) * | 2017-04-01 | 2017-07-25 | 东风汽车悬架弹簧有限公司 | The third generation spring for automobile band steel and preparation method of a kind of microalloying |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20110059441A (en) * | 2009-11-27 | 2011-06-02 | 현대제철 주식회사 | Vaccum refining method of ultra low carbon steel |
| CN102071359A (en) * | 2011-01-27 | 2011-05-25 | 河北钢铁股份有限公司唐山分公司 | Ultra-high-intensity automobile structural steel and production method thereof |
| CN102936636A (en) * | 2012-11-16 | 2013-02-20 | 内蒙古包钢钢联股份有限公司 | Method for manufacturing medium-carbon low-alloy steel TDC66T-1 containing boron |
| CN106978571A (en) * | 2017-04-01 | 2017-07-25 | 东风汽车悬架弹簧有限公司 | The third generation spring for automobile band steel and preparation method of a kind of microalloying |
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