CN104946844B - The method of refining of rail steel - Google Patents
The method of refining of rail steel Download PDFInfo
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- CN104946844B CN104946844B CN201510427243.8A CN201510427243A CN104946844B CN 104946844 B CN104946844 B CN 104946844B CN 201510427243 A CN201510427243 A CN 201510427243A CN 104946844 B CN104946844 B CN 104946844B
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- argon
- acetylenogen
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Abstract
The invention discloses a kind of method of refining of rail steel, the method includes converter tapping process and carries out wash heat using active lime, then carries out the modification of ladle top slag using Acetylenogen.；Modified ladle is delivered to LF and is carried out residue adjustment process, refine is carried out using active lime and Acetylenogen., adition process at least secondary addition in two batches, and argon flow amount meets early stage argon flow amount for 100～200Nl/min, mid-term adopts 100～200Nl/min, and the later stage adopts 100～150Nl/min argon flow amount.Sulfur content≤0.006% in molten steel after LF is processed, processes the later stage in LF and adds quartz sand to reduce ladle basicity of slag, and after being further continued for refine appropriate time, then send RH application of vacuum.The method is applied to production high-quality rail steel, and in steel, sulfur content meets≤0.006%.
Description
Technical field
The present invention relates to the technical field of smelting of rail steel is and in particular to a kind of method of refining of rail steel.
Background technology
In the prior art, the method for refining of the rail steel being produced using converter LF RH continuous casting process flow process is existing
Report, and adopt active lime, refining process to adopt the refine of active lime and quartz sand slag making for a kind of employing converter
Method has no report.
If number of patent application is 201210243888.2, that application discloses a kind of side of heavy rail steel refining desulfurization rapidly
Method, the method is in converter tapping process, and Calx is added in ladle, and in molten steel per ton, the addition of Calx is 3～4kg；
And when tapping process forms " wash heat ", sulfur≤0.020% in LF stove steel；Changed under the conditions of temperature is 1510～1530 DEG C
Slag, and add deoxidizer to carry out slag making and top of the slag deoxidation in temperature-rise period；Until MnO+FeO≤0.5% in slag；Insulation is straight
To turn in-furnace slag basicity be 2.0～3.0 when, to the slag top of the slag add by molten steel per ton add 0.5～1kg carbide and
The fluorite of 0.5～1kg, and continue to be heated to 1620 DEG C；After intensification terminates, adjustment argon flow amount is to 400L/min, Argon
Time 15～30min, that is, realize molten steel desulfurization rapidly.But it is 2-3 that this application requires basicity, meanwhile, this application reduces MnS and is mingled with
When thing, do not account for other field trashes.
If patent publication No. is CN104313245, patent name is the patent Shen of the method for Properties of Heavy Rail Steel refine desulfurization rapidly
Please, disclose a kind of method of heavy rail steel refining desulfurization rapidly, the method is in converter tapping process, and Calx is added ladle
Interior, in molten steel per ton, the addition of Calx is 3～4kg；And when tapping process forms " wash heat ", sulfur in LF stove steel≤
0.020%；Temperature be 1510～1530 DEG C under the conditions of carry out slugging, and in temperature-rise period add deoxidizer carry out slag making and
Top of the slag deoxidation；Until MnO+FeO≤0.5% in slag；It is incubated up to when turning the basicity of in-furnace slag for 2.0～3.0, to slag
The top of the slag is added and is added the carbide of 0.5～1kg and the fluorite of 0.5～1kg by molten steel per ton, and continues to be heated to 1620 DEG C；
After intensification terminates, adjustment argon flow amount to 400L/min, argon blowing time 15～30min, that is, realizes molten steel desulfurization rapidly.But this Shen
Please desulfuration efficiency relatively low.
Content of the invention
Instant invention overcomes the deficiencies in the prior art, provide a kind of method of refining of rail steel.
For solving above-mentioned technical problem, the present invention employs the following technical solutions：
A kind of method of refining of rail steel, described method of refining comprises the following steps：
A, converter smelting
Converter smelting is carried out using the molten iron that S mass percentage content is less than 0.020%；
In converter tapping process, deoxidation of molten steel is carried out using Si-Ca-Ba, add active lime simultaneously in tapping process；
After converter tapping terminates, first add Acetylenogen. to the ladle top of the slag, described Acetylenogen. uniform fold on the ladle top of the slag,
Described Acetylenogen. addition is 0.2～0.4kg/t steel；Then carry out argon bottom-blowing, Argon throughput is 50～80Nl/min, blows
The argon time >=5min；
B, LF refining
Carry out steel ladle bottom argon blowing when ladle enters LF refining station, Argon throughput is 150～200Nl/min, Argon 2～
After 3min, add active lime into ladle, described active lime addition is 2～3kg/t steel；
After the completion of active lime adds, add Acetylenogen. 0.2～0.4kg/t steel into ladle and carry out refine；
After refine 10min, ladle bottom blowing argon flow amount is adjusted to 100～200Nl/min,
Acetylenogen. 0.2～0.4kg/t steel is added to carry out refine again into ladle；
After refine 10min, ladle bottom blowing argon flow amount is adjusted to 100～150Nl/min；
Add quartz sand again into ladle, described quartz sand addition is 1.5～2.5kg/t steel, proceed to heat, when
After liquid steel temperature reaches 1570 DEG C to 1585 DEG C, adjustment ladle bottom blowing argon flow amount is 50～80Nl/min, blows under this flow
After argon 6～10min, molten steel outbound；
C, RH application of vacuum
During RH application of vacuum, insertion tube lift gas flow is 1200～1500NL/min, and vacuum is less than
More than process time 20min of 300pa；
After RH application of vacuum 15～18min, keep vacuum, add alloy, carry out alloying；
After alloying, more than circular treatment 5min, make composition uniformly, vacuum breaker；
It is more than 50～80Nl/min blowing argon gas 5min using ladle bottom blowing argon flow amount；Then ladle is carried out continuous casting billet
Produce.
Further technical scheme is that in step A, active lime addition is 3～5kg/t steel.
Further technical scheme is that in step A, Acetylenogen. includes Ca2C, described Ca2C accounts for described Acetylenogen. gross mass and divides
Number percentage ratio more than 98%.
The principle of the technology contents of the present invention is described below：
The method includes converter tapping process and carries out wash heat using active lime, then carries out ladle top slag using Acetylenogen.
Modification；Modified ladle is delivered to LF and is carried out residue adjustment process, carries out refine using active lime and Acetylenogen., adition process is extremely
Few secondary in two batches addition, and argon flow amount meets early stage argon flow amount for 100～200Nl/min, mid-term adopts 100～200Nl/
Min, the later stage adopts 100～150Nl/min argon flow amount.Sulfur content≤0.006% in molten steel after LF is processed, at LF
The reason later stage adds quartz sand to reduce ladle basicity of slag, and after being further continued for refine appropriate time, then send RH application of vacuum.The method is fitted
For producing high-quality rail steel, and in steel, sulfur content meets≤0.006%.
Compared with prior art, the invention has the beneficial effects as follows：The present invention makes Properties of Heavy Rail Steel realize desulfurization rapidly in LF stove,
Make Properties of Heavy Rail Steel LF stove sulfur≤0.006% leaving from station, ratio reaches more than 90%, reduces the rank of Properties of Heavy Rail Steel A type impurity, purifies
Molten steel, improves the cleanliness factor of Properties of Heavy Rail Steel.While controlling MnS, control other kind of type impurity.Using higher basicity,
Desulfuration efficiency is high and stable, and for molten steel, each type impurity can act as obvious improvement result, is not limited only to A class
Field trash.
Specific embodiment
All features disclosed in this specification, or disclosed all methods or during step, except mutually exclusive
Feature and/or step beyond, all can combine by any way.
Any feature disclosed in this specification (including any accessory claim, summary), unless specifically stated otherwise,
Replaced by other alternative features equivalent or that there is similar purpose.I.e., unless specifically stated otherwise, each feature is a series of
One of equivalent or similar characteristics example.
With reference to embodiment, the specific embodiment of the present invention is described in detail.
Embodiment 1
The S mass percentage content entering Converter molten iron is 0.016%, after converter smelting terminates, starts to tap, tapped
Journey adds calsibar alloy to carry out deoxidation into ladle, and addition is 2.5kg/t steel, and Si-Ca-Ba adds steel after the completion of adding immediately
Other alloys needed for kind.When tapping is 90 ton hours, add active lime 5kg/t steel into ladle.After tapping terminates, to ladle slag
Face is uniformly added into Acetylenogen. 0.2kg/t steel.In above-mentioned tapping process, ladle bottom blowing argon flow amount adopts 60Nl/min.Tapping terminates
Afterwards, using BOTTOM ARGON BLOWING flow Argon 6min of 50Nl/min, then molten steel is sent to LF refining.
Molten steel is connected BOTTOM ARGON BLOWING to after LF station and is carried out steel ladle bottom argon blowing, and argon blowing rate adopts 150Nl/min, Argon 2min
Afterwards, active lime 2.0kgt/ steel, Acetylenogen. 0.2kg/t steel are added successively into ladle, slag charge continues heating refine after adding；
After refine 10min, ladle bottom blowing argon flow amount is adjusted to 150Nl/min, into ladle, then adds Acetylenogen. 0.4kg/t
Steel, slag charge proceeds refine after adding；Again after refine 10min, ladle bottom blowing argon flow amount is adjusted to 100Nl/min, to
Add quartz sand 1.5kg/t in ladle, then proceed to heat refine, after refine 8min, liquid steel temperature reaches 1575 DEG C.Now,
Ladle bottom blowing argon flow amount is adjusted to 80Nl/min, now molten steel S content is 0.006% to sample analysis, and molten steel LF outbound is simultaneously
It is sent to RH and carry out application of vacuum.
Molten steel, to after RH vacuum station, sets RH insertion tube lift gas flow as 1500NL/min, starts evacuation, 3min
Vacuum reaches 100pa and stablizes and carry out application of vacuum in here value afterwards, when treated between for 18min when, keep vacuum, plus
Enter carburant 50kg, ferromanganese 100kg, after alloy adds, circular treatment 7min, make composition uniformly, vacuum breaker.Then blowing argon gas
6min, molten steel is sent to continuous casting working procedure, produces into 280 × 380mm bloom continuous casting base product, and continuous casting billet product passes through to roll work
Skill, produces into the rail steel of 60kg/m.Detected by this rail that the method being provided using the present invention is obtained, using this
In the rail of technique productions, sulfur content is 0.006%, and field trash items are rated 1.5 grades of A class, and B class, C class, D class are 0.5 grade, T
[O] average out to 13.4 × 10-6.
Embodiment 2
The S mass percentage content entering Converter molten iron is 0.020%, after converter smelting terminates, starts to tap, tapped
Journey adds calsibar alloy to carry out deoxidation into ladle, and addition is 3.5kg/t steel, and Si-Ca-Ba adds steel after the completion of adding immediately
Other alloys needed for kind.When tapping is 90 ton hours, add active lime 5kg/t steel into ladle.After tapping terminates, to ladle slag
Face is uniformly added into Acetylenogen. 0.4kg/t steel.In above-mentioned tapping process, ladle bottom blowing argon flow amount adopts 60Nl/min.Tapping terminates
Afterwards, using BOTTOM ARGON BLOWING flow Argon 6min of 50Nl/min, then molten steel is sent to LF refining.
Molten steel is connected BOTTOM ARGON BLOWING to after LF station and is carried out steel ladle bottom argon blowing, and argon blowing rate adopts 150Nl/min, Argon 2min
Afterwards, active lime 3.0kgt/ steel, Acetylenogen. 0.4kg/t steel are added successively into ladle, slag charge continues heating refine after adding；
After refine 10min, ladle bottom blowing argon flow amount is adjusted to 150Nl/min, into ladle, then adds Acetylenogen. 0.2kg/t
Steel, slag charge proceeds refine after adding；Again after refine 10min, ladle bottom blowing argon flow amount is adjusted to 100Nl/min, to
Add quartz sand 2.5kg/t in ladle, then proceed to heat refine, after refine 8min, liquid steel temperature reaches 1580 DEG C.Now,
Ladle bottom blowing argon flow amount is adjusted to 80Nl/min, now molten steel S content is 0.005% to sample analysis, and molten steel LF outbound is simultaneously
It is sent to RH and carry out application of vacuum.
Molten steel, to after RH vacuum station, sets RH insertion tube lift gas flow as 1500NL/min, starts evacuation, 3min
Vacuum reaches 100pa and stablizes and carry out application of vacuum in here value afterwards, when treated between for 17min when, keep vacuum, plus
Enter carburant 70kg, ferromanganese 120kg, after alloy adds, circular treatment 7min, make composition uniformly, vacuum breaker.Then blowing argon gas
6min, molten steel is sent to continuous casting working procedure, produces into 280 × 380mm bloom continuous casting base product, and continuous casting billet product passes through to roll work
Skill, produces into the rail steel of 60kg/m.Detected by this rail that the method being provided using the present invention is obtained, using this
In the rail of technique productions, sulfur content is 0.005%, and field trash items are rated 1.0 grades of A class, and B class, C class, D class are 0.5 grade, T
[O] average out to 11.6 × 10-6.
Embodiment 3
The S mass percentage content entering Converter molten iron is 0.010%, after converter smelting terminates, starts to tap, tapped
Journey adds calsibar alloy to carry out deoxidation into ladle, and addition is 3.0kg/t steel, and Si-Ca-Ba adds steel after the completion of adding immediately
Other alloys needed for kind.When tapping is 90 ton hours, add active lime 3kg/t steel into ladle.After tapping terminates, to ladle slag
Face is uniformly added into Acetylenogen. 0.3kg/t steel.In above-mentioned tapping process, ladle bottom blowing argon flow amount adopts 60Nl/min.Tapping terminates
Afterwards, using BOTTOM ARGON BLOWING flow Argon 6min of 50Nl/min, then molten steel is sent to LF refining.
Molten steel is connected BOTTOM ARGON BLOWING to after LF station and is carried out steel ladle bottom argon blowing, and argon blowing rate adopts 150Nl/min, Argon 2min
Afterwards, active lime 3.0kgt/ steel, Acetylenogen. 0.3kg/t steel are added successively into ladle, slag charge continues heating refine after adding；
After refine 10min, ladle bottom blowing argon flow amount is adjusted to 150Nl/min, into ladle, then adds Acetylenogen. 0.3kg/t
Steel, slag charge proceeds refine after adding；Again after refine 10min, ladle bottom blowing argon flow amount is adjusted to 100Nl/min, to
Add quartz sand 2.0kg/t in ladle, then proceed to heat refine, after refine 8min, liquid steel temperature reaches 1577 DEG C.Now,
Ladle bottom blowing argon flow amount is adjusted to 80Nl/min, now molten steel S content is 0.005% to sample analysis, and molten steel LF outbound is simultaneously
It is sent to RH and carry out application of vacuum.
Molten steel, to after RH vacuum station, sets RH insertion tube lift gas flow as 1500NL/min, starts evacuation, 3min
Vacuum reaches 100pa and stablizes and carry out application of vacuum in here value afterwards, when treated between for 18min when, keep vacuum, plus
Enter carburant 30kg, ferromanganese 80kg, after alloy adds, circular treatment 8min, make composition uniformly, vacuum breaker.Then blowing argon gas
6min, molten steel is sent to continuous casting working procedure, produces into 280 × 380mm bloom continuous casting base product, and continuous casting billet product passes through to roll work
Skill, produces into the rail steel of 60kg/m.Detected by this rail that the method being provided using the present invention is obtained, using this
In the rail of technique productions, sulfur content is 0.005%, and field trash items are rated 2.0 grades of A class, and B class, C class, D class are 0.5 grade, T
[O] average out to 12.7 × 10-6.
" embodiment ", " another embodiment ", " embodiment " spoken of in this manual, etc., refer to tie
Specific features, structure or the feature of closing the description of this embodiment include at least one embodiment in the description of the application generality
In.Multiple local appearance statement of the same race in the description is not necessarily to refer to same embodiment.Furthermore, it is understood that combine appointing
When one embodiment describes specific features, structure or feature, to be advocated is to realize this with reference to other embodiment
Plant feature, structure or feature also to fall within the scope of the present invention.
Although reference be made herein to invention has been described for the multiple explanatory embodiments invented, however, it is to be understood that this
Skilled person can be designed that a lot of other modifications and embodiment, and these modifications and embodiment will fall in the application
Within disclosed spirit and spirit.More specifically, in the range of disclosure claim, can be to theme group
Close the building block of layout and/or layout carries out multiple modifications and improvement.Except the modification that building block and/or layout are carried out
Outer with improving, to those skilled in the art, other purposes also will be apparent from.
Claims (3)
1. a kind of method of refining of rail steel it is characterised in that：Described method of refining comprises the following steps：
A, converter smelting
Converter smelting is carried out using the molten iron that S mass percentage content is less than 0.020%；
In converter tapping process, deoxidation of molten steel is carried out using Si-Ca-Ba, add active lime simultaneously in tapping process；
After converter tapping terminates, first add Acetylenogen. to the ladle top of the slag, described Acetylenogen. uniform fold is on the ladle top of the slag, described
Acetylenogen. addition is 0.2～0.4kg/t steel；Then carry out argon bottom-blowing, Argon throughput is 50～80NL/min, during Argon
Between >=5min；
B, LF refining
Carry out steel ladle bottom argon blowing when ladle enters LF refining station, Argon throughput is 150～200NL/min, Argon 2～3min
Afterwards, add active lime into ladle, described active lime addition is 2～3kg/t steel；
After the completion of active lime adds, add Acetylenogen. 0.2～0.4kg/t steel into ladle and carry out refine；
After refine 10min, ladle bottom blowing argon flow amount is adjusted to 100～200NL/min,
Acetylenogen. 0.2～0.4kg/t steel is added to carry out refine again into ladle；
After refine 10min, ladle bottom blowing argon flow amount is adjusted to 100～150NL/min；
Add quartz sand again into ladle, described quartz sand addition is 1.5～2.5kg/t steel, proceed to heat, work as molten steel
After temperature reaches 1570 DEG C to 1585 DEG C, adjustment ladle bottom blowing argon flow amount is 50～80NL/min, blowing argon gas 6 under this flow
After～10min, molten steel outbound；
C, RH application of vacuum
During RH application of vacuum, insertion tube lift gas flow is 1200～1500NL/min, and vacuum is less than 300Pa's
More than process time 20min；
After RH application of vacuum 15～18min, keep vacuum, add alloy, carry out alloying；
After alloying, more than circular treatment 5min, make composition uniformly, vacuum breaker；
It is more than 50～80NL/min blowing argon gas 5min using ladle bottom blowing argon flow amount；Then ladle is carried out continuous casting billet life
Produce.
2. rail steel according to claim 1 method of refining it is characterised in that in described step A active lime add
Measure as 3～5kg/t steel.
3. rail steel according to claim 1 method of refining it is characterised in that in described step A Acetylenogen. include
CaC2, described CaC2Account for described Acetylenogen. total mass fraction percentage ratio more than 98%.
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| CN109022661B (en) * | 2017-06-12 | 2020-06-23 | 鞍钢股份有限公司 | Method for reducing heavy rail steel rail damage rate |
| CN109207669A (en) * | 2018-09-25 | 2019-01-15 | 武汉钢铁有限公司 | The method of refining of high speed heavy rail steel |
| CN110904303B (en) * | 2019-10-31 | 2022-01-25 | 邯郸钢铁集团有限责任公司 | Smelting method of rail steel |
| CN110819767A (en) * | 2019-11-20 | 2020-02-21 | 曲靖促创科技有限公司 | Refining agent and refining process for scrap iron steelmaking |
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| EP0593000B1 (en) * | 1992-10-15 | 1998-03-25 | NMH STAHLWERKE GmbH | Steels for rails |
| CN101948983B (en) * | 2009-07-10 | 2012-06-06 | 攀钢集团攀枝花钢铁研究院有限公司 | Preparation method of rail steel |
| CN102268512B (en) * | 2011-07-08 | 2013-06-26 | 攀钢集团有限公司 | Control method for inclusion in steel |
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