CN107790666A - Large section Properties of Heavy Rail Steel continuous casting control method - Google Patents
Large section Properties of Heavy Rail Steel continuous casting control method Download PDFInfo
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- CN107790666A CN107790666A CN201711056856.0A CN201711056856A CN107790666A CN 107790666 A CN107790666 A CN 107790666A CN 201711056856 A CN201711056856 A CN 201711056856A CN 107790666 A CN107790666 A CN 107790666A
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- 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
- B22D11/16—Controlling or regulating processes or operations
- B22D11/18—Controlling or regulating processes or operations for pouring
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- 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
- B22D11/114—Treating the molten metal by using agitating or vibrating means
- B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields
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- 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
- B22D11/16—Controlling or regulating processes or operations
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/50—Pouring-nozzles
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Abstract
The invention discloses a kind of large section Properties of Heavy Rail Steel continuous casting control method, particularly a kind of large section Properties of Heavy Rail Steel continuous casting control method for being related to field of steel metallurgy.The large section Properties of Heavy Rail Steel continuous casting of the present invention, crystallizer uses the tube type mold of parabolic type taper curve, cooling water pipeline is provided with two cooling water inlets and two coolant outlets, large section Properties of Heavy Rail Steel crystallizer uses submersed nozzle, submersed nozzle uses double-side-hole, and stir current intensity is 300A to 400A, power frequency 2.4Hz, secondary cooling water specific water is carried out in the follow-up freezing range of crystallizer to match with pulling rate, solidification end pressure.Using the application by effectively controlling crystallizer molten steel flow field and solidification to cool down, secondary cooling system is rationally controlled on this basis, to the field that exerted a force outside strand, optimization casting blank solidification tissue, improves solute element segregation, raising strand central dense.
Description
Technical field
The present invention relates to a kind of large section Properties of Heavy Rail Steel continuous casting control method, particularly one kind to be related to Ferrous Metallurgy neck
The large section Properties of Heavy Rail Steel continuous casting control method in domain.
Background technology
Rail is the main building block of railroad track, in railway transport course, locomotive is provided and effectively supports and draws
Lead, be subjected to the huge lateral pressure from wheel.Based on China's infrastructure growth requirement, railway transportation is just with swift and violent speed
Degree development, and constantly tend to high speed, heavy loading.Rail specification size also gradually increases, and to reduce welding point, ensures railway
The higher globality of rail, the scale of big specification rail are also increasing.By fixed compared with light section strand rolling large-size length in the past
The rail of chi undoubtedly requires that strand length scaling is longer, and this causes subsequent heat treatment equipment to need to carry out larger transformation；In addition, such as
If casting blank cross-section size is constant, and rail specification becomes large-sized, and this compression ratio to the operation of rolling undoubtedly impacts, final shadow
Ring the physical indexs such as rail consistency.In continuous casting production process, strand goes out after crystallizer, all heats of molten steel essentially by
Green shell discharges, and the solidification that the quality of green shell dramatically influences molten steel inside strand develops, including solidified structure is integrally uniform
Property and circumferential uniformity etc., and for large section Properties of Heavy Rail Steel continuous casting, due to its steel grades and molten steel
The influence of solidification and heat transfer principle, casting blank solidification process cross-section temperature gradient is larger, and wick-containing is longer, and solidification of molten steel is held inside strand
The continuous time is longer, and the homoepitaxial for strand solidified inside tissue is established important foundation by effective control of green shell quality.
Crystallizer is the part of most critical in continuous casting, and it is referred to as " heart " of conticaster by industry, and it is to green shell
The important function of quality control is embodied in：Casting blank shape is qualified when ensureing crystallizer, and has enough thickness resistance molten steel quiet
Press and avoid bleedout；Ensure green shell along crystallizer circumference homoepitaxial, above-mentioned effect determines continuous casting rate and strand matter
Amount control.There are many scholars to carry out numerous studies to solidification shell quality control, research direction is concentrated mainly on solidification base
The prediction of thickness of the shell, the mechanism of the acquisition of green shell safe thickness and casting process bleedout and detection control research, for specific
Continuous casting billet shell quality control research it is relatively fewer, particularly with large section (320mm*410mm) continuous casting Properties of Heavy Rail Steel
During green shell solidification control research have no substantially.
Such as：
CN104384469A discloses the forecasting system and method for pre-hardening shell thickness in a kind of steel continuous casting crystallizer.This hair
It is bright including：Information acquisition module：For gathering casting steel grades, crystallizer physical dimension, submersed nozzle physical dimension, company
Casting process condition and along the pre-hardening shell thickness measured value at crystallizer diverse location and interdendritic away from measured value；The crystallization
Device physical dimension, including width of plate slab, slab thickness, crystallizer height, copper plate thickness, tank depth, sink thicknesses and nickel dam
Thickness；The continuous casting process condition, including the outlet of meniscus position, casting speed, inlet water temperature, wide face exit water temperature, leptoprosopy
Water temperature, wide face cooling water flow and leptoprosopy cooling water flow；The submersed nozzle physical dimension, including submersed nozzle immerse
Depth and submersed nozzle side opening inclination angle；Steel grade thermal physical property parameter computing module：The casting collected according to information acquisition module
Steel grades and interdendritic calculate interdendritic solute segregation and solidification path during solidification of molten steel, and then obtain away from measured value
Steel grade thermal physical property parameter simultaneously sends it to crystallizer initial set shell growth prediction module；The steel grade thermal physical property parameter, including it is solid
Liquidus temperature, thermal conductivity factor, density, specific heat and latent heat of solidification；Crystallizer initial set shell growth prediction module：By in crystallizer
Shape inside macroscopic transport process and crystallizer copper plate surface forming core, molten steel including heat transmission, MOMENTUM TRANSMISSION and mass transport
Microcosmic solidified structure including core and grain growth develops behavior and coupled, and the crystallization collected according to information acquisition module
Device physical dimension, submersed nozzle physical dimension and continuous casting process condition and from steel grade thermal physical property parameter computing module receive
Steel grade thermal physical property parameter, predict the internal high temperature solidification of molten steel process shell growth behavior of casting process crystallizer and send it to knot
Fruit output module；As a result output module：Show the crystallizer solidified inside tissue topography of prediction, i.e., pre-hardening green shell life image conversion
Growth process, and quantification show crystallizer initial set shell thickness predicted value, by pre-hardening the shell thickness predicted value and information
The pre-hardening green shell measured value of crystallizer of acquisition module collection is compared, and the output display comparative result.But for super
Some crucial particular contents of big cross section (320mm*410mm) Properties of Heavy Rail Steel green shell quality control equipment technique are not directed to.
CN103386472A discloses a kind of acquisition methods of continuous cast mold outlet green shell safe thickness.The present invention includes
Following steps：Measure steel green shell surface temperature Tf, the width B of strand, roller spacing L, ferrostatic pressure P；Calculated by formula
The elastic modulus E of flat board；Pass through the bending stiffness D of formula calculate flat board；Calculated by formula between crystallizer outlet and sufficient roller
Maximum bulge deformation wmax；Maximum bulge deformation wmax between crystallizer outlet and sufficient roller is less than or equal to the critical bulge of green shell
Deformation quantity wc is criterion, determines continuous cast mold outlet green shell safe thickness S scope；Wherein, α is numerical factor, and v is Poisson
Than Ts is the solidus temperature of steel.And for large section (320mm*410mm) Properties of Heavy Rail Steel green shell quality control equipment technique
Some crucial particular contents be not directed to.
CN101138785 discloses a kind of continuous cast method of bloom, and the technical scheme of the invention is：The continuous casting of bloom
Method, including the secondary cooling to green shell, wherein green shell pass sequentially through five spraying and cooling areas and carry out secondary cooling, five sprays
It is respectively 151~194l/ (min × m that cooling zone cools down direction intensity of cooling along green shell2), 34~50l/ (min × m2), 23~
35l/(min×m2), 12~19l/ (min × m2), 8~11l/ (min × m2).The present invention is by during green shell is thickening
The intensity of cooling to green shell is gradually reduced, so as to effectively reduce the internal-external temperature difference of green shell, the thermal stress of square billet is reduced, reduces generous
Base continuous casting defect.It is the Medium Carbon Steel Containing Manganese such as 450mm × 360mm, material 35Mn2,37Mn2 disclosure is particularly well suited to cross dimension
The continuous casting of bloom.But equip the one of technique for the quality control of large section (320mm*410mm) Properties of Heavy Rail Steel green shell
A little crucial particular contents are not directed to.
The content of the invention
The invention provides a kind of large section Properties of Heavy Rail Steel Inner Quality of Billet of production is preferable, strand center can be dredged
The slab quality such as pine, center segregation, central pipe powder injection molding is in the other large section Properties of Heavy Rail Steel continuous casting control of lower level
Method.
The present invention is large section Properties of Heavy Rail Steel continuous casting control method, large section weight used by solving the above problems
The solidification of rail steel green shell controls the crystallizer of equipment to use tube type mold of the inner wall shape for parabolic type taper curve, and tubular type
Crystallizer cooling water pipeline is provided with two cooling water inlets and two coolant outlets, and large section Properties of Heavy Rail Steel crystallizer uses
Submersed nozzle, the submersed nozzle uses double-side-hole, and side opening dips down and thanks 15 °, and the submersed nozzle external diameter is φ
95mm, internal diameter are φ 45mm, deep-controlled in 100mm to 120mm, large section heavy rail in the submersed nozzle insertion water
The electromagnetic mixing apparatus of steel crystallizer is installed on its height medium line apart from crystallizer 620mm opening positions in lower section suitable for reading, crystallizer
Electromagnetic agitation current strength control range is 300A to 400A, and stir current frequency is 2.4Hz, in the follow-up freezing range of crystallizer
Carry out secondary cooling water specific water to match with pulling rate, 0.22~0.30l/kg of Water Rate for Secondary Cooling Water, 0.65~0.75m/ of matching pulling rate
min；Solidification end is depressed, 16~20mm of overall reduction；End electromagnetic agitation is installed on 13.5m positions under crystallizer molten steel surface
Place, solidification end electromagnetic agitation stir current 200~350A of intensity, stir current frequency 7.0Hz.
It is further that the flow of valve regulation crystallizer cooling water is adjusted using DN250.
It is further that cooling water inflow control is in the range of 3550L/min~3700L/min in crystallization process, hydraulic pressure
Control is in the range of 0.80MP~0.90MP.
It is further that cast superheat of liquid steel control is in the range of 15 DEG C~30 DEG C, for the first heat of middle bag, overheat
Degree control is at 25 DEG C~40 DEG C.
The beneficial effects of the invention are as follows：Using the large section Properties of Heavy Rail Steel continuous casting control method of the application, by having
Effect control crystallizer molten steel flow field and solidification cooling, ensure that strand obtains high quality green shell in crystallizer section, close on this basis
Reason control secondary cooling system, to the field that exerted a force outside strand, optimization casting blank solidification tissue, improve solute element segregation, improve strand center
Compactness, finally realize the high level control of large section Properties of Heavy Rail Steel Inner Quality of Billet.
Embodiment
The crystallizer of large section Properties of Heavy Rail Steel continuous casting control method uses inner wall shape to throw used by the application
The tube type mold of thing line style taper curve, and tube type mold cooling water pipeline is provided with two cooling water inlets and two are cold
But water out, large section Properties of Heavy Rail Steel crystallizer use submersed nozzle, and the submersed nozzle uses double-side-hole, and side opening to
Have a down dip and thank 15 °, the submersed nozzle external diameter is φ 95mm, and internal diameter is φ 45mm, the depth in the submersed nozzle insertion water
Degree control is installed on its height medium line distance in 100mm to 120mm, the electromagnetic mixing apparatus of large section Properties of Heavy Rail Steel crystallizer
Crystallizer 620mm opening positions in lower section suitable for reading, M-EMS Current strength control scope are 300A to 400A, stir current
Frequency is 2.4Hz, and carry out secondary cooling water specific water in the follow-up freezing range of crystallizer matches with pulling rate, Water Rate for Secondary Cooling Water 0.22
~0.30l/kg, 0.65~0.75m/min of matching pulling rate；Solidification end is depressed, 16~20mm of overall reduction.Wherein electromagnetic agitation
Device height medium line refers to a virtual elevation line positioned at the half position of electromagnetic mixing apparatus height.Crystallizer uses
Inner wall shape is the shrinkage factor that parabolic type taper curve can preferably adapt to the change of box hat different parts, can optimize strand
Corner cools down, and improves the control of strand corner defect, the process of setting of box hat can be made more uniform, make the consistency of thickness of box hat
It is higher.Simultaneously the application tube type mold cooling water pipeline is provided with two cooling water inlets and two coolant outlets can be with
Heat transfer uniformity is improved, so as to improve quality during box hat cooling.The application also designs suitable crystallizer submersed nozzle, water
Mouth uses double-side-hole, and side opening has a down dip 15 °, mouth of a river external diameter φ 95mm, internal diameter φ 45mm, and formulates matching insertion depth,
Insertion depth is controlled in 100mm~120mm, stable so that Mold flow field is effectively ensured, and is that solidified shell is uniform and stable
Growth provides essential condition, while ensures that mold liquid level steadily prevents slag, promotes covering slag slag thickness to be uniformly distributed；Matching is closed
Suitable intensity of cooling with crystallizer exit position provide adequate thickness green shell with supporting steel hydrostatic pressure simultaneous transmission molten steel
To the heat of external diffusion.The application is by design construction M-EMS reasonable installing position, and comprehensive stirring intensity is to knot
Brilliant device level stability, the optimization of crystallizer flow field, strand segregation and the influence of equiaxial crystal ratio control determine reasonable crystallizer
Electricity stirs current strength, realizes shell thickness in crystallizer, the equal control of chemical composition.
In addition, the application is also using the flow of DN250 regulation valve regulation crystallizer cooling waters.Crystallizer is equipped with appropriate cold
But intensity, crystallizer cooling water is fine-tuned using DN250 regulating valves, ensures shell thickness.
Cooling water inflow control is in the range of 3550L/min~3700L/min in crystallization process, and hydraulic pressure control is in 0.80MP
In the range of~0.90MP.Quality is cooled down to improve, accurately controls cooling effect, the application carries out strict to cooling water inflow and hydraulic pressure
Control, to obtain the product of high quality.
To improve box hat product quality, the application is to pouring into a mould superheat of liquid steel, the especially middle degree of superheat for wrapping the first heat
Accurately controlled.Superheat of liquid steel control is wherein poured into a mould in the range of 15 DEG C~30 DEG C, for the first heat of middle bag, the degree of superheat
Control is at 25 DEG C~40 DEG C
The embodiment of the present invention is further described with reference to embodiment.
Embodiment 1
The embodiment is method production large section (320mm*410) of certain steel mill using the invention of this equipment technology
U71Mn heavy rail steel continuous casting billets.The specific execution of the technology of the present invention is：Filled using the tube type mold of parabolic type taper curve
It is standby；Tube type mold water route is entered two times for two；Crystallizer cooling water inflow 3625L/min, hydraulic pressure 0.85MPa；Crystallizer immersion
The mouth of a river uses double-side-hole, and side opening has a down dip 15 °, mouth of a river external diameter φ 95mm, internal diameter φ 45mm, and matching insertion depth control is in 108mm；
Crystallizer electricity is stirred to be installed on and (stirred apart from crystallizer 620mm opening positions suitable for reading with crystallizer electricity in the middle part of height as foundation)；Crystallizer
Electromagnetic agitation current strength 350A, stir current frequency 2.4Hz.Crystallizer subsequent segment, preceding progress is solidified completely in strand：Two is cold
0.22~0.28l/kg of specific water, 0.65~0.70m/min of pulling rate is matched, 0.68m/min (constant speed cast) ratio of holding reaches
91%；Solidification end is depressed, and pressure range is that 2#~5# depresses roller, 16~18mm of overall reduction.Except using the above-mentioned of the present invention
Outside critical equipment technology.Other technological parameters：Actual degree of superheat control range is wrapped in cast as 17 DEG C~27 DEG C, it is average 24 DEG C.
Casting process Mold liquid level stabilizing, covering slag thickness distribution are uniform.It is right after continuous casting terminates
U71Mn heavy rails steel continuous casting billet carries out low power detection；Corroded using cold sour dendrite, detection strand cross section shell thickness distribution feelings
Condition, as a result show, the Properties of Heavy Rail Steel U71Mn solidification shells thickness that the technological invention is produced is circumferentially distributed uniformly along section, whole
Body is controlled in 15~18mm；Strand corner quality is good, and columnar zone develops uniform, isometric crystalline region along width and thickness direction
Symmetry is preferable, remaining low multiple quality index：0.5 grade of center porosity, 0.5 grade of shrinkage cavity, 0.5 grade of center segregation, no other defect.
Segregation detection is carried out to strand, green shell and its neighbouring carbon degree of segregation replace without obvious negative and positive, and composition is uniform.
Embodiment 2
The embodiment is method production large section (320mm*410) U75V of certain steel mill using the invention of this equipment technology
Heavy rail steel continuous casting billet.The specific execution of the technology of the present invention is：Equipped using the tube type mold of parabolic type taper curve；Tubular type
Crystallizer water route is entered two times for two；Crystallizer cooling water inflow 3550L/min, hydraulic pressure 0.80MPa；Crystallizer submersed nozzle uses
Double-side-hole, side opening have a down dip 15 °, mouth of a river external diameter φ 95mm, internal diameter φ 45mm, and matching insertion depth control is in 100mm；Crystallizer electricity
Stir to be installed on and (stirred apart from crystallizer 620mm opening positions suitable for reading with crystallizer electricity in the middle part of height as foundation)；M-EMS
Current strength 300A, stir current frequency 2.4Hz.Crystallizer subsequent segment, preceding progress is solidified completely in strand：Water Rate for Secondary Cooling Water
0.26~0.28l/kg, 0.67~0.72m/min of pulling rate is matched, keep 0.68m/min (constant speed cast) ratios up to 88%；Solidification
End is depressed, and pressure range is that 2#~6# depresses roller, 16~17mm of overall reduction.Except the above-mentioned critical equipment skill using the present invention
Outside art.Other technological parameters：Actual degree of superheat control range is wrapped in cast as 15 DEG C~26 DEG C, it is average 22 DEG C.
Casting process Mold liquid level stabilizing, covering slag thickness distribution are uniform.After continuous casting terminates, to U75V
Heavy rail steel continuous casting billet carries out low power detection；Corroded using cold sour dendrite, detection strand cross section shell thickness distribution situation, as a result
It has been shown that, the Properties of Heavy Rail Steel U75V solidification shells thickness that the technological invention is produced is circumferentially distributed uniformly along section, and overall control exists
17~18mm；Strand corner quality is good, columnar zone develop along width and thickness direction it is uniform, isometric crystalline region symmetry compared with
It is good, remaining low multiple quality index：0.5 grade of center porosity, 0.5 grade of shrinkage cavity, 0.5~1.0 grade of center segregation, no other defect.It is right
Strand carries out segregation detection, and green shell and its neighbouring carbon degree of segregation replace without obvious negative and positive, and composition is uniform.
Embodiment 3
The embodiment is method production large section (320mm*410) of certain steel mill using the invention of this equipment technology
U78CrV heavy rail steel continuous casting billets.The specific execution of the technology of the present invention is：Filled using the tube type mold of parabolic type taper curve
It is standby；Tube type mold water route is entered two times for two；Crystallizer cooling water inflow 3700L/min, hydraulic pressure 0.90MPa；Crystallizer immersion
The mouth of a river uses double-side-hole, and side opening has a down dip 15 °, mouth of a river external diameter φ 95mm, internal diameter φ 45mm, and matching insertion depth control is in 120mm；
Crystallizer electricity is stirred to be installed on and (stirred apart from crystallizer 620mm opening positions suitable for reading with crystallizer electricity in the middle part of height as foundation)；Crystallizer
Electromagnetic agitation current strength 400A, stir current frequency 2.4Hz.Crystallizer subsequent segment, preceding progress is solidified completely in strand：Two is cold
0.24~0.30l/kg of specific water, 0.66~0.75m/min of pulling rate is matched, 0.68m/min (constant speed cast) ratio of holding reaches
90%；Solidification end is depressed, and pressure range is that 2#~6# depresses roller, 15~18mm of overall reduction.Except using the above-mentioned of the present invention
Outside critical equipment technology.Other technological parameters：Actual degree of superheat control range is wrapped in cast as 17 DEG C~30 DEG C, it is average 25 DEG C.
Casting process Mold liquid level stabilizing, covering slag thickness distribution are uniform.It is right after continuous casting terminates
U78CrV heavy rails steel continuous casting billet carries out low power detection；Corroded using cold sour dendrite, detection strand cross section shell thickness distribution feelings
Condition, as a result show, the Properties of Heavy Rail Steel U78CrV solidification shells thickness that the technological invention is produced is circumferentially distributed uniformly along section, whole
Body is controlled in 15~18mm；Strand corner quality is good, and columnar zone develops uniform, isometric crystalline region along width and thickness direction
Symmetry is preferable, remaining low multiple quality index：0.5~1.0 grade of center porosity, 0 grade of shrinkage cavity, 0.5 grade of center segregation, lacked without other
Fall into.Segregation detection is carried out to strand, green shell and its neighbouring carbon degree of segregation replace without obvious negative and positive, and composition is uniform.
Above-mentioned embodiment explanation, after the invention of this equipment technology, large section (320mm*410mm) Properties of Heavy Rail Steel
Casting blank shell quality is good, and shell thickness is uniformly distributed vertically, and other quality of strand are effectively controlled, especially strand post
Shape crystalline region develops uniformly along width and thickness direction, and symmetry is good, and the isometric crystalline region symmetry in strand central area is preferable, low power
Quality index control is more excellent, and corresponding rail superficial dense layer thickness is uniform, and other capability and performances are all qualified.
Claims (4)
1. large section Properties of Heavy Rail Steel continuous casting control method, it is characterised in that：Large section Properties of Heavy Rail Steel green shell solidification control dress
Standby crystallizer uses tube type mold of the inner wall shape for parabolic type taper curve, and tube type mold cooling water pipeline is set
Two cooling water inlets and two coolant outlets are equipped with, large section Properties of Heavy Rail Steel crystallizer uses submersed nozzle, the leaching
Enter the formula mouth of a river and use double-side-hole, and side opening dips down and thanks 15 °, the submersed nozzle external diameter is φ 95mm, and internal diameter is φ 45mm,
It is deep-controlled in 100mm to 120mm, the electromagnetic agitation of large section Properties of Heavy Rail Steel crystallizer in the submersed nozzle insertion water
Device is installed on its height medium line apart from crystallizer 620mm opening positions in lower section suitable for reading, M-EMS Current intensity control
Scope processed is 300A to 400A, and stir current frequency is 2.4Hz, and carrying out secondary cooling water in the follow-up freezing range of crystallizer compares water
Amount matches with pulling rate, 0.22~0.30l/kg of Water Rate for Secondary Cooling Water, 0.65~0.75m/min of matching pulling rate；Solidification end is depressed, always
16~20mm of drafts.
2. large section Properties of Heavy Rail Steel continuous casting control method as claimed in claim 1, it is characterised in that：Adjusted using DN250
Save the flow of valve regulation crystallizer cooling water.
3. large section Properties of Heavy Rail Steel continuous casting control method as claimed in claim 1, it is characterised in that：In crystallization process
Cooling water inflow is controlled in the range of 3550L/min~3700L/min, and hydraulic pressure control is in the range of 0.80MP~0.90MP.
4. large section Properties of Heavy Rail Steel continuous casting control method as claimed in claim 1, it is characterised in that：Pour into a mould molten steel overheat
Degree control is in the range of 15 DEG C~30 DEG C, and for the first heat of middle bag, the degree of superheat is controlled at 25 DEG C~40 DEG C.
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108687317A (en) * | 2018-06-29 | 2018-10-23 | 攀钢集团攀枝花钢铁研究院有限公司 | The method that bloom continuous casting produces 42CrMoH steel |
| CN108687315A (en) * | 2018-06-29 | 2018-10-23 | 攀钢集团攀枝花钢铁研究院有限公司 | The method that bloom continuous casting produces 22CrMo pinion steels |
| CN108705051A (en) * | 2018-06-29 | 2018-10-26 | 攀钢集团攀枝花钢铁研究院有限公司 | 20CrMnTiH pinion steel bloom continuous casting production methods |
| CN108705050A (en) * | 2018-06-29 | 2018-10-26 | 攀钢集团攀枝花钢铁研究院有限公司 | The method that bloom continuous casting produces 34CrMo4 oxygen cylinder steel |
| CN108705052A (en) * | 2018-06-29 | 2018-10-26 | 攀钢集团攀枝花钢铁研究院有限公司 | The continuous casting producing method of bloom pinion steel strand |
| CN108705055A (en) * | 2018-06-29 | 2018-10-26 | 攀钢集团攀枝花钢铁研究院有限公司 | M+F-EMS control method in bloom continuous casting |
| CN108746525A (en) * | 2018-06-29 | 2018-11-06 | 攀钢集团攀枝花钢铁研究院有限公司 | Bloom consistency takes into account the continuous cast method of control with homogeneity |
| CN108772542A (en) * | 2018-06-29 | 2018-11-09 | 攀钢集团攀枝花钢铁研究院有限公司 | The method that bloom continuous casting produces 20CrMo pinion steels |
| CN109536735A (en) * | 2018-12-24 | 2019-03-29 | 昆明理工大学 | A kind of method and device reducing EB furnace melting titanium or titanium alloy slab ingot coagulation defect |
| CN110216255A (en) * | 2019-07-22 | 2019-09-10 | 攀钢集团攀枝花钢铁研究院有限公司 | Bloom Properties of Heavy Rail Steel casting blank solidification tissue improves control method |
| CN110280732A (en) * | 2019-07-22 | 2019-09-27 | 攀钢集团攀枝花钢铁研究院有限公司 | Large section Properties of Heavy Rail Steel homogenieity cooperates with lifting control method with compactness |
| CN111702143A (en) * | 2020-06-03 | 2020-09-25 | 攀钢集团攀枝花钢铁研究院有限公司 | Forced cooling-based method for reducing A-type inclusion size of heavy rail steel |
| CN115026251A (en) * | 2022-06-28 | 2022-09-09 | 芜湖新兴铸管有限责任公司 | Process improvement method for improving flaw detection qualification rate of high-aluminum steel |
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| CN110280732A (en) * | 2019-07-22 | 2019-09-27 | 攀钢集团攀枝花钢铁研究院有限公司 | Large section Properties of Heavy Rail Steel homogenieity cooperates with lifting control method with compactness |
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| CN111702143B (en) * | 2020-06-03 | 2021-10-29 | 攀钢集团攀枝花钢铁研究院有限公司 | Forced cooling-based method for reducing A-type inclusion size of heavy rail steel |
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