CN108856665A - A kind of Si killed steel smelting process that sizing formula casting Aluminum steel packet uses - Google Patents
A kind of Si killed steel smelting process that sizing formula casting Aluminum steel packet uses Download PDFInfo
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- CN108856665A CN108856665A CN201810607559.9A CN201810607559A CN108856665A CN 108856665 A CN108856665 A CN 108856665A CN 201810607559 A CN201810607559 A CN 201810607559A CN 108856665 A CN108856665 A CN 108856665A
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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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/111—Treating the molten metal by using protecting powders
-
- 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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/36—Processes yielding slags of special composition
-
- 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
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
Abstract
The invention discloses the Si killed steel smelting process that a kind of sizing formula casting Aluminum steel packet uses, this method preferentially aoxidizes the aluminium fused into molten steel first is that according to Aluminum steel band aluminum steel, aluminium slag feature, reduces molten steel aluminium content；Second is that being promoted to the ability of clinker dross inclusion adsorption；Third is that carrying out denaturation treatment to field trash, extending the removal of inclusions time；Fourth is that carrying out stablizing casting using full guard mode, relatively large sliding block mode.The present invention passes through Optimal improvements steelmaking converter, refining, continuous casting critical process, it ensures when sizing formula casting Aluminum steel packet uses, the molten steel composition of Si killed steel casting, steel quality, casting are normal, while ensure that production stabilization, the efficient operation of a plurality of production line, different steel grade techniques.
Description
Technical field
The invention belongs to Ferrous Metallurgy continuous-casting arts, and in particular to a kind of silicon that sizing formula casting Aluminum steel packet uses is calm
Steel smelting operating method.
Background technique
As to the continuous expansion of steel products demand, steel product presentation purposes is wider, order more refines, smelting both at home and abroad
The developing direction that sweetening process is more complicated, performance indicator is tended towards superiority, iron company is designed by Multiple components, New Techniques optimize etc.
Means realize the diversity of product, are able to satisfy multiple market urgent need substantially.But in steel industry industrial production, by
Miscellaneous, process variations of production planning and sequencing steel grade etc. influence, and need molten steel Sheng device ladle special line dedicated, are bound to cause smelting process investment
More ladle meets production requirement, forms biggish waste.
For example, the Si killed steel in the case where smelting sizing nozzle casting mode, uses other steel grade (aluminum killed steels/town Lv Gui
Quiet steel) when containing with device, molten steel alchlor is mingled with the problems such as on the high side, molten steel is higher containing aluminium and is difficult to be fully solved for the molten steel smelted.
Occurring set eye or drop in the casting of conticaster sizing nozzle, pulling rate is notably unplanned stops pouring accident.Pulling rate unusual fluctuations are to slab
There are the increased risk of crackle, mill bar quality is easily cracked, performance is unstable etc. product defects, under the production model of high yield
It is difficult to adapt to technique requirement.
Therefore, a kind of smelting, casting method that can overcome drawbacks described above is needed.
Summary of the invention
The object of the present invention is to provide the Si killed steel smelting operation sides that a kind of sizing formula casting Aluminum steel packet uses
Method.Present invention ensures that smelting Si killed steel molten steel composition, steel quality, continuous casting in the case where Aluminum steel packet uses, sizing formula is cast
Machine casting is normal, while ensure that production stabilization, the efficient operation of a plurality of production line, various steels technique.
To achieve the goals above, the invention adopts the following technical scheme：
One, according to Aluminum steel band aluminum steel, aluminium slag feature, preferentially aoxidizes the aluminium fused into molten steel, reduces molten steel aluminium
Content；Second is that being promoted to the ability of clinker dross inclusion adsorption；Third is that carrying out denaturation treatment to field trash, extension removal is mingled with
The object time；Fourth is that carrying out stablizing casting using full guard mode, relatively large sliding block mode.
Specifically, a kind of Si killed steel smelting operation method used based on above-mentioned sizing formula casting Aluminum steel packet, it is described
Method includes the following steps：
1) in the case of smelting Si killed steel, before Aluminum steel packet investment, ladle pouring residue molten steel, steel slag evacuation；
2) converter terminal deoxidization technique optimizes, and when smelting Q235B steel series, deoxidier is reduced to by 2.5kg/ tons
2.0kg/ tons, when smelting Q345B steel series, deoxidier is reduced to 0.6kg/ tons by 1.0kg/ tons, and deoxidier is Si-Ca-Ba, puts steel
600~800kg synthetic slag (20%CaF+80%CaO) is added on the ladle top of the slag afterwards；
3) refining procedure, the mixing time that 1. enters the station control between 3-5min；2. the whipping process that enters the station addition 200~
400kg lime, 100~150kg fluorite；3. the energization slugging time controls in 8~10min；4. according to terminal aluminium component situation into
Row calcification, when Alt≤0.005%, high calcium line feeds 40~60 meters/furnace, as Alt >=0.005%, high calcium line feeding 60~80
Rice/furnace；5. the soft blow time controls in 12min or more；6. refining end-point alkalinity control 2.3 or more；7. refining the yellowish-white slag time
Control is in 15min or more；
4) continuous casting working procedure, 1. the big water-coating port argon envelope flow control of ladle is in 100~120L/min；2. tundish gliding block uses
Diameter 17.5mm+18mm size；3. pouring basket liquid level controls 900mm or more when casting, rice husk covering in molten steel face is uniform, tight,
Reduce secondary oxidation of steel and smooth disorder and slag.
Smelting process according to the present invention, it includes Al deoxidization steel but without aluminium requirement steel grade that Aluminum steel packet, which smelts steel grade,
(such as：Broadband Q235B1/Q345B1), Al deoxidization steel have aluminium requirement steel (such as：Broadband SPHC-1/SAE1006-B).
Smelting process according to the present invention, naked-eye observation bottom of steel ladle, containment wall, packet are along without obvious steel slag, that is, Aluminum steel
Packet evacuation.
The present invention is related quasi- using preceding progress to Aluminum steel packet in advance when different production lines, different steel grade start-stop pour production
Standby work.Conticaster replaces sliding block use according to the casting of packet containing aluminium prediction scheme；It builds process and Aluminum steel packet is put into and advance
Row scarfing cinder is provided special care to, and the clean purity of ladle is improved, while ensuring that bottom blowing air permeability effect is stablized.
The present invention is suitable for production smelting of all Si killed steels under the mixed state, sizing casting mode of Aluminum steel packet
Refining.
The present invention solves under existing sizing casting mode, and Aluminum steel packet is split in the castability and slab stocking of Si killed steel
Line and other issues.
Converter of the present invention uses high alkalinity, strong mixing, coarse whiting, extends the removal of inclusions time using deoxidation, refining is fallen,
Continuous casting using full guard, exaggerate sizing nozzle using means.It solves under sizing nozzle casting mode, Aluminum steel packet is in silicon calmness
The castability of steel and slab stocking crackle and other issues, the waste for improving production efficiency, reducing cost.
It is smelted using the present invention, casting method, ladle is when different production lines, the production of different steel grade are mixed, conticaster casting
Normally, situations such as no set eye, drop pulling rate, occurs, and conticaster average pull rate is 0.98m/min, and casting blank of continuous casting machine quality is normal, rolls
Steel mill's mill bar quality, performance are stablized, and steel making working procedure ladle utilization rate significantly improves, and ladle temperature drop, molten steel temperature drop significantly reduce.It is comprehensive
It is upper described, Aluminum steel packet can satisfy using the present invention and come into operation what the smelting of Si killed steel, sizing formula were cast, meet low
Carbon, green smelting technique developing direction requirement, have biggish use, can operate, generalization.
In a plurality of production line cross-mixing smelting process, steel grade type, process variations are larger, mainly include al-killed
Steel, aluminium-silicon killed steel, Si killed steel three categories.Sheng with ladle cross-reference is imitated most beneficial for the shortening of production time, ladle
The promotion of rate and making full use of for thermal energy.But more actual process problem is brought after ladle is mixed, such as：Molten steel composition, steel
Water quality, continuous irrigatation castability etc..The present invention passes through Optimal improvements steelmaking converter, refining, continuous casting critical process, it is ensured that in sizing
Formula casts Aluminum steel packet in use, the molten steel composition of Si killed steel casting, steel quality, casting are normal, while ensure that a plurality of
Production stabilization, the efficient operation of production line, different steel grade techniques.
Specific embodiment
Any feature is disclosed to obtain in this specification, it unless specifically stated, can be equivalent or with similar purpose by other
Alternative features are replaced.Unless specifically stated, each feature is an example in a series of equivalent or similar characteristics
?.It is described to understand the present invention just for the sake of help, it should not be considered as to concrete restriction of the invention.
A kind of steel making operation method that Si killed steel is smelted based on above-mentioned Aluminum steel packet, described used by embodiment 1-2
Method includes the following steps：
1) in the case of smelting Si killed steel, before Aluminum steel packet investment, ladle pouring residue molten steel, steel slag evacuation；
2) converter terminal deoxidization technique optimizes, and when smelting Q235B steel series, deoxidier is reduced to by 2.5kg/ tons
2.0kg/ tons, when smelting Q345B steel series, deoxidier is reduced to 0.6kg/ tons by 1.0kg/ tons, and deoxidier is Si-Ca-Ba, puts steel
600~800kg synthetic slag (20%CaF+80%CaO) is added on the ladle top of the slag afterwards；
3) refining procedure, the mixing time that 1. enters the station control between 3-5min, and argon pressure is 0.8~1.0Mpa；2. into
200~400kg lime, 100~150kg fluorite is added in whipping process of standing；3. the energization slugging time controls in 8~10min；4. root
Calcification is carried out according to terminal aluminium component situation, when Alt≤0.005%, high calcium line feeds 40~60 meters/furnace, when Alt >=0.005%
When, high calcium line feeds 60~80 meters/furnace；5. the soft blow time controls in 12min or more；6. refine end-point alkalinity control 2.3 with
On；7. refining the control of yellowish-white slag time in 15min or more；
4) continuous casting working procedure, 1. the big water-coating port argon envelope flow control of ladle is in 100~120L/min；2. tundish gliding block uses
Diameter 17.5mm+18mm size；3. pouring basket liquid level controls 900mm or more, rice husk covering in molten steel face uniformly, tightly, reduces steel
Water secondary oxidation and smooth disorder and slag.
The smelting process according to claim, Aluminum steel Baogang kind include Al deoxidization steel but require steel grade (example without aluminium
Such as：Broadband Q235B1/Q345B1), Al deoxidization steel have aluminium requirement steel (such as：Broadband SPHC-1/SAE1006-B)；
The smelting process according to claim, Aluminum steel packet evacuation, naked-eye observation bottom of steel ladle, containment wall, packet are along nothing
Obvious steel slag.
The present invention is related quasi- using preceding progress to Aluminum steel packet in advance when different production lines, different steel grade start-stop pour production
Standby work.Conticaster replaces sliding block use according to the casting of packet containing aluminium prediction scheme；It builds process and Aluminum steel packet is put into and advance
Row scarfing cinder is provided special care to, and the clean purity of ladle is improved, while ensuring that bottom blowing air permeability effect is stablized；
Production SPHC-1/Q345B1 Aluminum steel packet investment Si killed steel in broadband is smelted, casting situation progress tracking verification,
It is as follows：
Embodiment 1
Mixed ladle service condition, ladle number：No. 5/34 times, heat (batch) number：H172-3478, steel grade：SPHC-1, ingredient C%
0.05, Si%0.02, Mn%0.14, P%0.018, S%0.008, Alt%0.045；
Si killed steel service condition, ladle number：No. 5/35 times, heat (batch) number H171-2860, steel grade：Q235B-1, ingredient C%
0.16, Si%0.16, Mn%0.43, P%0.016, S%0.005, Alt%0.006；Synthetic slag is added in converter：800kg, deoxidation
2.0kg/ tons of agent；Refining, which is entered the station, stirs 4min, and argon pressure 0.9Mpa enters the station and lime 250kg, fluorite 120kg is added, and calcification is high
70 meters of calcium line, soft blow time 13min；The big packet argon of conticaster seals flow 120L/min, sliding block 17.5/18mm.
Using smelting process method of the present invention, the refinery cinder white slag time is 20min, and terminal basicity of slag is 2.43, even
Casting machine casts pulling rate as 0.98m/min, and slab, mill bar quality are normal；This production line ladle subtracts with 1, substantially increases steel
Packet utilization rate reduces ladle in the heat waste of circular flow.
Embodiment 2
Mixed ladle service condition, ladle number：No. 8/26 times, heat (batch) number：H172-3478, steel grade：Q345B1, ingredient C%
0.14, Si%0.20, Mn%0.65, P%0.021, S%0.009, Alt%0.018；
Si killed steel service condition, ladle number：No. 8/27 times, heat (batch) number H171-2860, steel grade：Q235B-1, ingredient C%
0.17, Si%0.18, Mn%0.45, P%0.019, S%0.004, Alt%0.005；Synthetic slag is added in converter：800kg, deoxidation
2.0kg/ tons of agent；Refining, which is entered the station, stirs 3.5min, and argon pressure 0.8Mpa enters the station and lime 200kg, fluorite 100kg, calcification is added
50 meters of high calcium line, soft blow time 12min；The big packet argon of conticaster seals flow 110L/min, sliding block 17.5/18mm.
Using smelting process method of the present invention, the refinery cinder white slag time is 23min, and terminal basicity of slag is 2.38, even
Casting machine casts pulling rate as 0.97m/min, and slab, mill bar quality are normal；This production line ladle subtracts with 1, substantially increases steel
Packet utilization rate reduces ladle in the heat waste of circular flow.
From the above results, using this smelting, casting method, ladle when different production lines, the production of different steel grade are mixed,
Situations such as conticaster casting is normal, no set eye, drop pulling rate occurs, and conticaster average pull rate is 0.98m/min, casting blank of continuous casting machine matter
Amount is normal, and steel rolling mill's mill bar quality, performance are stablized, and steel making working procedure ladle utilization rate significantly improves, and ladle temperature drop, molten steel temperature drop are bright
It is aobvious to reduce.
In conclusion smelt using the present invention, casting method, Aluminum steel packet can satisfy in the smelting, fixed of Si killed steel
The casting of diameter formula is come into operation, and continuous casting pulling rate of casting is stablized, and slab, mill bar quality meet indices requirement, meets low-carbon, green
The requirement of color smelting technique developing direction has biggish use, can operate, generalization.
Technological parameter (such as temperature, time) section bound value of the invention and interval value can realize this law,
Embodiment numerous to list herein.
It should be noted last that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting.Although ginseng
It is described the invention in detail according to embodiment, it will be apparent to an ordinarily skilled person in the art that technical side of the invention
Case is modified or replaced equivalently, and without departure from the spirit and scope of technical solution of the present invention, should all be covered in the present invention
Scope of the claims in.
Claims (3)
1. a kind of Si killed steel smelting process that sizing formula casting Aluminum steel packet uses, the described method comprises the following steps：
1) in the case of smelting Si killed steel, cast before Aluminum steel packet investment, in ladle remaining molten steel, steel slag evacuation；
2) converter terminal deoxidization technique optimizes, and when smelting Q235B steel series, deoxidier is reduced to 2.0kg/ by 2.5kg/ tons
Ton；When smelting Q345B steel series, deoxidier is reduced to 0.6kg/ tons by 1.0kg/ tons；600 are added on the ladle top of the slag after putting steel
~800kg synthetic slag；
3) refining procedure：
The mixing time that enters the station controls between 3-5min, and argon pressure is 0.8~1.0Mpa；
200~400kg lime, 100~150kg fluorite is added in the whipping process that enters the station；
The energization slugging time controls in 8~10min；
Carry out calcification according to terminal aluminium component situation, when Alt≤0.005%, high calcium line feeds 40~60 meters/furnace, when Alt >=
When 0.005%, high calcium line feeds 60~80 meters/furnace；
The control of soft blow time refines end-point alkalinity control 2.3 or more, the control of refining yellowish-white slag time exists in 12min or more
15min or more；
4) continuous casting working procedure：
The big water-coating port argon envelope flow control of ladle is in 100~120L/min；Tundish gliding block uses diameter 17.5mm+18mm ruler
It is very little；Pouring basket liquid level controls 900mm or more.
2. the Si killed steel smelting process that a kind of sizing formula casting Aluminum steel packet according to claim 1 uses, feature
It is, the Aluminum steel packet includes Al deoxidization steel but without aluminium requirement steel grade：Broadband Q235B1/Q345B1；Al deoxidization steel has aluminium to want
Seek steel：Broadband SPHC-1/SAE1006-B.
3. the Si killed steel smelting process that a kind of sizing formula casting Aluminum steel packet according to claim 1 uses, feature
It is, in the step 2), deoxidier is Si-Ca-Ba, and synthetic slag contains 20%CaF and 80%CaO.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110144431A (en) * | 2019-04-04 | 2019-08-20 | 山东泰山钢铁集团有限公司 | A kind of calcium treating method for the refining of LF furnace |
| CN111020112A (en) * | 2019-12-25 | 2020-04-17 | 山东钢铁股份有限公司 | Method for improving castability of silicon deoxidized steel grade |
| CN112961956A (en) * | 2021-02-02 | 2021-06-15 | 武安市裕华钢铁有限公司 | Refining slag making method |
| CN114717383A (en) * | 2022-04-20 | 2022-07-08 | 山东莱钢永锋钢铁有限公司 | Smelting process control method of low-aluminum-content killed steel |
| CN115710613A (en) * | 2022-11-25 | 2023-02-24 | 陕钢集团汉中钢铁有限责任公司 | Control method for low inclusion of silicon killed steel |
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| CN114717383A (en) * | 2022-04-20 | 2022-07-08 | 山东莱钢永锋钢铁有限公司 | Smelting process control method of low-aluminum-content killed steel |
| CN115710613A (en) * | 2022-11-25 | 2023-02-24 | 陕钢集团汉中钢铁有限责任公司 | Control method for low inclusion of silicon killed steel |
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