CN110144431A - A kind of calcium treating method for the refining of LF furnace - Google Patents
A kind of calcium treating method for the refining of LF furnace Download PDFInfo
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- CN110144431A CN110144431A CN201910272127.1A CN201910272127A CN110144431A CN 110144431 A CN110144431 A CN 110144431A CN 201910272127 A CN201910272127 A CN 201910272127A CN 110144431 A CN110144431 A CN 110144431A
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- slag
- steel
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- molten steel
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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
- C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
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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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses a kind of calcium treating methods for the refining of LF furnace, including following processing step: 1. molten steel enters the station；2. LF furnace seat Bao Dingwei；3. feeding the pure calcium line of 50m；4. thermometric samples；5. power transmission；6. being stained with slag；7. plus 70%-80% slag material；8. plus remaining slag material；9. plus aluminum shot residue adjustment is to yellowish-white slag；10. adjusting molten steel composition；Contents temperature is qualified；Feed remaining calcium line processing；Argon；Add heat preserving agent；Bull ladle；
Description
Technical field
The present invention relates to refining Calcium treatment technical field, in particular to a kind of calcium treating methods for the refining of LF furnace.
Background technique
The external refining of molten steel is also known as the second metallurgy of steel, refers to " whole until molten steel solidification after converter tapping
A process carries out all kinds of techniques of Metallurgical processing to molten steel ".It is intended to: on the basis of converter, further improving the object of molten steel
Reason, chemical property, optimization procedure connection matching, from after implementing external refining, Calcium treatment technology meets the tendency of generation: residual when liquid steel refining
Oxide and deoxidation products in molten steel is stayed to be suspended in molten steel, part of high (AL2O3 fusing point 2050 of inclusion melting point
DEG C), there are in molten steel, be easy to cause in the aggregation of tundish lower nozzle bowl portion during continuous casting in solid-state for characteristic
Nozzle blocking is dealt with improperly and easily causes interruption production accident；Field trash in steel can be broken during the rolling process, along rolling
Direction is continuously distributed, causes the major defects such as crackle, the final promotion for influencing product quality.Molten Steel Cleanliness is improved, steel is reduced
Middle oxygen content and oxide are mingled with, and are always a big difficulty in Ferrous Metallurgy, and Calcium treatment is to grow up the 1970s
A kind of liquid steel refining means, main purpose includes: that depth reduces the harmful elements content such as O, S in steel；Change field trash group
At form, avoids casting aluminum killed steel that nozzle blocking occurs and improve steel mechanics performance.
Traditional steel making working procedure LF ladle refining process flow is as follows: 1. molten steel enters the station；2. LF furnace seat Bao Dingwei；3. thermometric
Sampling；4. power transmission plus slag charge make reducing slag；5. adjusting molten steel composition；6. contents temperature is qualified；7. feeding calcium line processing；8. blowing
Argon；9. plus heat preserving agent；10. bull ladle；Continuous casting.Currently, feeding calcium line processing is after slag making, residue adjustment, contents temperature is qualified
After handled, this processing mode shows certain deficiency in present concise operation, and inclusion behavior control is undesirable,
B, for C type impurity compliance rate less than 85%, residue adjustment increases 1-2 member/t steel with aluminum shot ton steel, carries out for this to existing refinery practice
Optimization.
Summary of the invention
The technical problem to be solved by the present invention is to overcome the above technological deficiencies, provide a kind of Calcium treatment for the refining of LF furnace
Method.
In order to achieve the above object of the invention, a kind of the technical solution adopted by the present invention are as follows: Calcium treatment for the refining of LF furnace
Method, including following processing step: 1. molten steel enters the station；2. LF furnace seat Bao Dingwei；3. feeding the pure calcium line of 50m；4. thermometric samples；⑤
Power transmission；6. being stained with slag；7. plus 70%-80% slag material；8. plus remaining slag material；9. plus aluminum shot residue adjustment is to yellowish-white slag；10. adjusting steel
Water constituent；Contents temperature is qualified；Feed remaining calcium line processing；Argon；Add heat preserving agent；Bull ladle；Continuous casting.
Further, the pure calcium line of 50m is fed in advance: the affinity of calcium and oxygen being made full use of to be greater than the parent of aluminium, manganese, iron and oxygen
And power, CaO is most stable of in the oxide that they are formed, and feeding calcium line in advance into ladle can be such that oxygen activity in molten steel drops
As low as in stable narrow range, shift to an earlier date deoxidation so as to effectively control oxygen content in steel, Ca will preferentially be sent out with [O] in steel
Raw reaction；If encountering AL2O3 field trash, make its reduction, change the property and form of AL2O3 field trash, is mingled with part
Object deforms in advance, creates conditions in advance for part inclusion floating, using the strong feature of calcium deoxidizing capacity, reduces molten steel oxidation
To reduce aluminum shot usage amount, cost is reduced.[%O]≤80ppm is controlled before line feeding, after feeding metal calcium line, average DNA vaccine
It is 31.1%, highest DNA vaccine is up to 60%.It is reacted calcium when deoxidation in molten steel are as follows: Ca+O=CaO.In steel after deoxidation
The solubility of [Ca] and [O] is not high, and the activity of [O] need to be reached by increase [Ca] or reduction CaO in molten steel to be reduced.To
Calcium line is fed in ladle, the undissolved calcium in part, which becomes calcium steam, can also occur deoxygenation: Ca (g)+O=CaO (s).It does not feed
Slag color is shown in Fig. 1 before calcium line, and slag specimen and slag color are shown in Fig. 2 after feeding calcium line in advance, and pass through comparison: after feeding part calcium line, clinker has
Black hair dirt becomes glass dregs light tone, and slag beneficiation is substantially reduced.
Further, it then follows be stained with slag method for four times, first slag making residue adjustment principle again: molten steel enters after refining position opens argon gas, feeds
Entering first to be stained with slag after calcium line and see that bits glue bar situation, determines that quantity is added in lime, the 70-80% of total amount is added in principle last consignment of material,
One batch of material forbids lower electrode before being added, and preventing electrode from blocking lime causes lime knot to stick together, and refining agent 10-30 ㎏, lower electrode carries out
Slugging, slag making are stained with slag for 3 minutes or so and see that bits glue bar situation, it is determined whether add lime, two batch of material residue lime are complete in principle
Portion adds, and forbids before plus aluminum shot, bits glue bar rear progress residue adjustment operation up to standard substantially.If (early period, temperature was relatively low, first descended electrode
Aforesaid operations are carried out after temperature raising again), it must determine before residue adjustment and be stained with slag actual conditions, glue bar situation according to bits and determine that aluminum shot is added
Amount is added 70% or so of aluminum shot for the first time in principle, is stained with slag in time after aluminum shotization is good and is confirmed whether to add aluminum shot and number is added
Amount, one heat steel are at least stained with slag four times, and residue adjustment tune mistake is forbidden, and low-alloy steel avoids white slag tapping (special based on speiss in principle
Except it is required that), refining argon blowing time must be no less than 10 minutes.Slag color change comparison chart is shown in Fig. 3 after slagging.
Further, feed remaining calcium line: (1) main function is to be denaturalized behavior to sulphide inculsion, using Calcium treatment side
Method to the principle of MnS inclusion modification in steel is formed in advance during molten steel solidification by increasing the active calcium ion content in steel
High-melting-point CaS particle, molten steel can be inhibited to generate the total amount and aggregation extent of MnS in the process, and the part MnS or complete
Portion is modified to CaS, that is, forms the compound phase of tiny, single CaS phase or CaS and Mns.
Each element activity (alloying element 1%, sulphur 2%) in molten steel is considered, by each element sulfide free energy of formation by negative
Value arrangement:
When 1873K: CeS > CaS > Zr3S4 > TiS > MgS > MnS > FeS
When 1273K: CaS > CeS > MgS > MnS > FeS > MoS2 > Ni3S2 > Cu2S
If Ca and Mn simultaneously with reaction of Salmon-Saxl in steel and reach balance:
The calcium being added encounters MnS and is mingled with, then them will be made to restore, change its property and form.Pass through Calcium treatment
Method makes the MnS of strip in steel be mingled with nodularization, and it is hard and crisp to obtain matter, and the higher spherical sulfide of fusing point；
(2) being mingled with denaturation behavior-A12O3 field trash to AL2O3 is endogenous inclusion in steel.In killed steel, using Al
When deoxidization technique uses Fe-Al-Si or Al deoxidation, AL2O3 is to influence maximum one kind to steel during Common oxides are mingled with, it
Belong to the indeformable field trash of brittleness, differ greatly with the heat deformability of matrix, be easy to be broken during the rolling process and
It is continuously distributed to prolong rolling direction.The A12O3 brittle inclusion of bulk is broken into being mingled with sharp water chestnut, and chaining through deformation
Shape is distributed in the base, these hard A12O3 in irregular shape are mixed in deformation and can scratch matrix, and in field trash week
It encloses and generates stress collection midfield until forming gap or crackle at interface.The density ratio molten steel density of A12O3 system field trash is small,
If the form that can control aluminium deoxidation product makes it be in a liquid state at a temperature of steel-making continuous casting, so that it may so that a large amount of this kind of deoxidation
Product floats from molten steel before entering tundish to be removed, and can not only be mitigated clogging of tundish nozzle problem and be guaranteed that continuous casting is suitable
Benefit carries out, and can increase the cleannes of steel, improve the quality of steel.Field trash comparison chart is shown in figure before and after removal aluminium deoxidation product
4。
The invention has the benefit that can effectively control oxygen content in steel shifts to an earlier date deoxidation, shift to an earlier date part field trash
Deformation, creates conditions in advance for part inclusion floating, using the strong feature of calcium deoxidizing capacity, reduces molten steel oxidation to drop
Low aluminum shot usage amount, reduces cost；The MnS of strip in steel is set to be mingled with nodularization by the method for Calcium treatment, it is hard and crisp to obtain matter,
And the higher spherical sulfide of fusing point；A large amount of aluminium deoxidation product can be made to float from molten steel before entering tundish to go
It removes, can not only mitigate clogging of tundish nozzle problem and guarantee that continuous casting is gone on smoothly, but also the cleannes of steel can be increased, improved
The quality of steel.
Detailed description of the invention
Fig. 1 is the slag specimen slag chromatic graph before not feeding calcium line in ladle.
Fig. 2 is the slag specimen slag chromatic graph after feeding calcium line in advance in ladle.
Fig. 3 is slag color change comparison chart after slagging.
Fig. 4 is field trash comparison chart before and after removal aluminium deoxidation product.
Fig. 5 is that embodiment one feeds the slag specimen slag chromatic graph before calcium line.
Fig. 6 is that embodiment one feeds the slag specimen slag chromatic graph after calcium line.
Fig. 7 is the slag specimen figure of embodiment one.
Fig. 8 is the slag specimen figure of embodiment one.
Fig. 9 is the slag specimen figure of embodiment one.
Figure 10 is the slag specimen figure of embodiment one.
Figure 11 is that embodiment two feeds the slag specimen slag chromatic graph before calcium line.
Figure 12 is that embodiment two feeds the slag specimen slag chromatic graph after calcium line.
Figure 13 is the slag specimen figure of embodiment two.
Figure 14 is the slag specimen figure of embodiment two.
Figure 15 is the slag specimen figure of embodiment two.
Specific embodiment
In order that the present invention can be more clearly and readily understood, below technical solution in the embodiment of the present invention into
Row clearly and completely describes.
Embodiment one
A kind of calcium treating method for the refining of LF furnace, including following processing step: 1. molten steel enters the station；2. LF furnace seat Bao Ding
Position；3. feeding the pure calcium line of 50m；4. thermometric samples；5. power transmission；6. being stained with slag；7. plus 70%-80% slag material；8. plus remaining slag making
Material；9. plus aluminum shot residue adjustment is to yellowish-white slag；10. adjusting molten steel composition；Contents temperature is qualified；Feed remaining calcium line processing；It blows
Argon；Add heat preserving agent；Bull ladle；Continuous casting.
Converter tapping, molten steel are hoisted to LF refining, connect argon-blowing device, and adjustment Argon intensity to the exposed diameter of molten steel≤
300mm, by this Baogang, water is opened to refining furnace crown, is fed calcium line 50m in advance after being stained with slag confirmation clinker slag color (such as Fig. 5), is taken slag
Sample (such as Fig. 6) 1550 DEG C of thermometric, determines according to slag color change situation and 300 ㎏ of lime is added, and electrode carries out the under power 100kwh
Slag making operation, refining 3 minutes it is secondary be stained with slag (slag specimen such as Fig. 7), glue bar situation according to bits, again be added 100 ㎏ of lime,
Electrode carries out second of slag making operation under power 100kwh, and refining is stained with slag (slag specimen such as Fig. 8), slag making addition up to standard in 2 minutes three times
20 ㎏ of aluminum shot, lower electrode 3 minutes are stained with slag (slag specimen such as Fig. 9) three times, according to slag color be added 10 ㎏ aluminum shots, lower electrode 2 minutes, four
Secondary to be stained with slag (slag specimen such as Figure 10), residue adjustment to yellowish-white slag, residue adjustment finishes, electrode, and 1572 DEG C of thermometric, according to sample before finished product
Electrode 5 minutes under C0.09% addition 60 ㎏ of carburant, power 50kwh, slag slag, which confirms, plays electrode, thermometric after carburantization is complete
1583 DEG C, reach and put steel bar part, feeds the pure calcium line of residue 70m, Argon 10 minutes, continuous casting was poured on molten steel.
Oxygen activity in molten steel can be made to be reduced in stable narrow range by feeding calcium line in advance into ladle, so as to
Enough effective control oxygen content in steel shift to an earlier date deoxidation, and Ca will preferentially react with [O] in steel；If encountering AL2O3 field trash,
Then make its reduction, changes the property and form of AL2O3 field trash, deform part field trash in advance, be in advance part field trash
Floating creates conditions, and using the strong feature of calcium deoxidizing capacity, reduces molten steel oxidation to reduce by 10 ㎏ of this furnace aluminum shot usage amount,
Reduce cost 2.5 yuan/T steel.
Embodiment two
A kind of calcium treating method for the refining of LF furnace, including following processing step: 1. molten steel enters the station；2. LF furnace seat Bao Ding
Position；3. feeding the pure calcium line of 50m；4. thermometric samples；5. power transmission；6. being stained with slag；7. plus 70%-80% slag material；8. plus remaining slag making
Material；9. plus aluminum shot residue adjustment is to yellowish-white slag；10. adjusting molten steel composition；Contents temperature is qualified；Feed remaining calcium line processing；It blows
Argon；Add heat preserving agent；Bull ladle；Continuous casting.
Converter tapping, molten steel are hoisted to LF refining, connect argon-blowing device, and adjustment Argon intensity to the exposed diameter of molten steel≤
300mm, by this Baogang, water is opened to refining furnace crown, is fed calcium line 50m in advance after being stained with slag confirmation clinker slag color (such as Figure 11), is taken slag
Sample (such as Figure 12), determines according to slag color change situation and 250 ㎏ of lime is added, electrode carries out under power 120kwh by 1540 DEG C of thermometric
First time slag making operation, refining 3 minutes it is secondary be stained with slag (slag specimen such as Figure 13), glue bar situation according to bits, again be added lime 50
Electrode carries out second of slag making operation under ㎏, power 120kwh, and refining is stained with slag (slag specimen such as Figure 14) in 3 minutes three times, and slag making is up to standard
30 ㎏ of aluminum shot is added, lower electrode 5 minutes is stained with slag (slag specimen such as Figure 15) three times, and residue adjustment to yellowish-white slag, residue adjustment finishes, and plays electrode, surveys
1580 DEG C of temperature, according to electrode 4 minutes under sample C0.11% addition 50 ㎏ of carburant, power 50kwh before finished product, slag slag confirms carburetting
Agentization it is complete after rise electrode, 1585 DEG C of thermometric, reach and put steel bar part, feed the pure calcium line of 80m, Argon 12 minutes, on molten steel continuous casting into
Row casting.
Oxygen activity in molten steel can be made to be reduced in stable narrow range by feeding calcium line in advance into ladle, so as to
Enough effective control oxygen content in steel shift to an earlier date deoxidation, and Ca will preferentially react with [O] in steel；If encountering AL2O3 field trash,
Then make its reduction, changes the property and form of AL2O3 field trash, deform part field trash in advance, be in advance part field trash
Floating creates conditions, and using the strong feature of calcium deoxidizing capacity, reduces molten steel oxidation to reduce by 20 ㎏ of this furnace aluminum shot usage amount,
Reduce cost 5 yuan/T steel.
The present invention and its embodiments have been described above, this description is no restricted, only reality of the invention
One of mode is applied, actual embodiment is not limited thereto.All in all if those skilled in the art are opened by it
Show, without departing from the spirit of the invention, not inventively design embodiment similar with the technical solution,
It is within the scope of protection of the invention.
Claims (2)
1. a kind of calcium treating method for the refining of LF furnace, it is characterised in that: including following processing step: 1. molten steel enters the station；②
LF furnace seat Bao Dingwei；3. feeding the pure calcium line of 50m；4. thermometric samples；5. power transmission；6. being stained with slag；7. plus 70%-80% slag material；⑧
Add remaining slag material；9. plus aluminum shot residue adjustment is to yellowish-white slag；10. adjusting molten steel composition；Contents temperature is qualified；Feed remaining calcium
Line processing；Argon；Add heat preserving agent；Bull ladle；Continuous casting.
2. a kind of calcium treating method for the refining of LF furnace according to claim 1, it is characterised in that: follow four times and be stained with slag
Method, first slag making residue adjustment principle again.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113355483A (en) * | 2020-03-05 | 2021-09-07 | 马鞍山钢铁股份有限公司 | Deoxidation slagging technology for LF (ladle furnace) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102618781A (en) * | 2012-03-30 | 2012-08-01 | 莱芜钢铁集团有限公司 | Hot-rolled H-steel for low temperature-resistance structure and preparation method for hot-rolled H-steel |
| CN104451374A (en) * | 2014-11-27 | 2015-03-25 | 攀钢集团成都钢钒有限公司 | Excellent 60 or 65 carbon steel wire rod containing residual vanadium and production process of excellent 60 or 65 carbon steel wire rod |
| CN104711476A (en) * | 2015-03-12 | 2015-06-17 | 山东钢铁股份有限公司 | Channel steel for hot rolling of forklift portal and preparation method of channel steel |
| CN108856665A (en) * | 2018-06-13 | 2018-11-23 | 山东钢铁股份有限公司 | A kind of Si killed steel smelting process that sizing formula casting Aluminum steel packet uses |
| CN109055853A (en) * | 2018-07-24 | 2018-12-21 | 山东钢铁股份有限公司 | A kind of low-carbon sulphur system Cutting free ribbon steel and its production method |
-
2019
- 2019-04-04 CN CN201910272127.1A patent/CN110144431A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102618781A (en) * | 2012-03-30 | 2012-08-01 | 莱芜钢铁集团有限公司 | Hot-rolled H-steel for low temperature-resistance structure and preparation method for hot-rolled H-steel |
| CN104451374A (en) * | 2014-11-27 | 2015-03-25 | 攀钢集团成都钢钒有限公司 | Excellent 60 or 65 carbon steel wire rod containing residual vanadium and production process of excellent 60 or 65 carbon steel wire rod |
| CN104711476A (en) * | 2015-03-12 | 2015-06-17 | 山东钢铁股份有限公司 | Channel steel for hot rolling of forklift portal and preparation method of channel steel |
| CN108856665A (en) * | 2018-06-13 | 2018-11-23 | 山东钢铁股份有限公司 | A kind of Si killed steel smelting process that sizing formula casting Aluminum steel packet uses |
| CN109055853A (en) * | 2018-07-24 | 2018-12-21 | 山东钢铁股份有限公司 | A kind of low-carbon sulphur system Cutting free ribbon steel and its production method |
Non-Patent Citations (2)
| Title |
|---|
| 李正嵩等: "降低高碳钢冶炼成本的生产实践 ", 《四川冶金》 * |
| 梅雪辉等: "LF炉造白渣脱硫工艺实践 ", 《鞍钢技术》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113355483A (en) * | 2020-03-05 | 2021-09-07 | 马鞍山钢铁股份有限公司 | Deoxidation slagging technology for LF (ladle furnace) |
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