CN107812907A - Large section Properties of Heavy Rail Steel green shell method of quality control - Google Patents
Large section Properties of Heavy Rail Steel green shell method of quality control Download PDFInfo
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- CN107812907A CN107812907A CN201711021062.0A CN201711021062A CN107812907A CN 107812907 A CN107812907 A CN 107812907A CN 201711021062 A CN201711021062 A CN 201711021062A CN 107812907 A CN107812907 A CN 107812907A
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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
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
- B22D11/0406—Moulds with special profile
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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
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/50—Pouring-nozzles
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
- Continuous Casting (AREA)
Abstract
The invention discloses a kind of large section Properties of Heavy Rail Steel green shell method of quality control, particularly a kind of large section Properties of Heavy Rail Steel green shell method of quality control for being related to field of steel metallurgy.The large section Properties of Heavy Rail Steel green shell method of quality control of the present invention, crystallizer uses tube type mold of the inner wall shape for parabolic type taper curve, tube type mold cooling water pipeline is provided with two cooling water inlets and two coolant outlets, crystallizer uses submersed nozzle, submersed nozzle uses double-side-hole, and side opening dips down and thanks 15 °, and the depth that the mouth of a river is inserted in water is in 100mm to 120mm, electromagnetic agitation current strength control range is 300A to 400A, and stir current frequency is 2.4Hz.Large section (320mm*410mm) the Properties of Heavy Rail Steel casting blank shell quality produced using the large section Properties of Heavy Rail Steel green shell method of quality control of the application is good, shell thickness is uniformly distributed vertically, other quality of strand are effectively controlled, the isometric crystalline region symmetry in strand central area is preferable, and low multiple quality norm controlling is more excellent.
Description
Technical field
The present invention relates to a kind of large section Properties of Heavy Rail Steel green shell method of quality control, particularly one kind to be related to Ferrous Metallurgy neck
The large section Properties of Heavy Rail Steel green shell method of quality control 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
It can make that large section Properties of Heavy Rail Steel casting blank shell thickness is circumferentially uniform, and appearance and size is good the invention provides one kind
It is good, the uniform large section Properties of Heavy Rail Steel green shell method of quality control of casting blank solidification Tissue distribution.
The present invention is large section Properties of Heavy Rail Steel green shell method of quality control, 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.
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；Constant speed cast is carried out with target pull rate 0.68m/min, wherein pulling rate undulated control is in 0.65m/
In the range of min~0.75m/min.
The beneficial effects of the invention are as follows：Produced using the large section Properties of Heavy Rail Steel green shell method of quality control of the application super
Big cross section (320mm*410mm) Properties of Heavy Rail Steel casting blank shell quality is good, and shell thickness is uniformly distributed vertically, other quality of strand
It is effectively controlled, especially strand columnar zone develops uniform along width and thickness direction, and symmetry is good, strand center
The isometric crystalline region symmetry in domain is preferable, and low multiple quality norm controlling is more excellent, and corresponding rail superficial dense layer thickness is uniform, other quality
Performance is all qualified.
Embodiment
The crystallizer of large section Properties of Heavy Rail Steel green shell method of quality control 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.Wherein electromagnetic mixing apparatus height medium line refers to one positioned at the half position of electromagnetic mixing apparatus height
The virtual elevation line of bar.Crystallizer uses inner wall shape preferably to adapt to box hat different parts for parabolic type taper curve
The shrinkage factor of change, the cooling of strand corner can be optimized, improve the control of strand corner defect, the process of setting of box hat can be made more
Add uniformly, make the consistency of thickness of box hat higher.The application is provided with two coolings in tube type mold cooling water pipeline simultaneously
Water inlet and two coolant outlets can improve heat transfer uniformity, so as to improve quality during box hat cooling.The application is also set
Suitable crystallizer submersed nozzle is counted, 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 formulate matching insertion depth, insertion depth control is in 100mm~120mm, so that steel in crystallizer is effectively ensured
Liquid stream field is stable, and essential condition is provided for the uniform and stable growth of solidified shell, while ensures that mold liquid level steadily prevents slag,
Covering slag slag thickness is promoted to be uniformly distributed；Suitable intensity of cooling is matched to provide the base of adequate thickness in crystallizer exit position
Heat of the shell with supporting steel hydrostatic pressure simultaneous transmission molten steel to external diffusion.The application is closed by design construction M-EMS
Installation site is managed, comprehensive stirring intensity is to mould liquid level stability, the optimization of crystallizer flow field, strand segregation and equiax crystal
The influence of rate control determines that reasonable crystallizer electricity stirs current strength, realizes the uniform control of shell thickness in crystallizer, chemical composition
System.
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；Casting speed control is in the range of 0.65m/min~0.75m/min.
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 110mm；
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.In addition to using the above-mentioned critical equipment technology of the present invention.Other
Technological parameter：Actual degree of superheat control range is wrapped in cast as 17 DEG C~27 DEG C, it is average 23 DEG C.The normal casting speed control of casting process
In 0.67m/min~0.72m/min, 0.68m/min (constant speed cast) ratios are kept up to 86%.
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.In addition to using the above-mentioned critical equipment technology of the present invention.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.The normal casting speed control of casting process is in 0.65m/
Min~0.72m/min, 0.68m/min (constant speed cast) ratios are kept up to 84%.
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.In addition to using the above-mentioned critical equipment technology of the present invention.Other
Technological parameter：Actual degree of superheat control range is wrapped in cast as 17 DEG C~30 DEG C, it is average 25 DEG C.The normal casting speed control of casting process
In 0.66m/min~0.75m/min, 0.68m/min (constant speed cast) ratios are kept up to 83%.
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 green shell method of quality control, 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.
2. large section Properties of Heavy Rail Steel green shell method of quality control 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 green shell method of quality control 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 green shell method of quality control 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；With target pull rate
0.68m/min carries out constant speed cast, and wherein pulling rate undulated control is in the range of 0.65m/min~0.75m/min.
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| CN108746526A (en) * | 2018-06-29 | 2018-11-06 | 攀钢集团攀枝花钢铁研究院有限公司 | The continuous cast method of bloom Properties of Heavy Rail Steel corner quality control |
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| CN108746526A (en) * | 2018-06-29 | 2018-11-06 | 攀钢集团攀枝花钢铁研究院有限公司 | The continuous cast method of bloom Properties of Heavy Rail Steel corner quality control |
| 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 |
| CN109536735B (en) * | 2018-12-24 | 2024-05-07 | 昆明理工大学 | Method and device for reducing solidification defects of titanium and titanium alloy slab ingot smelted by EB furnace |
| CN110508770A (en) * | 2019-07-22 | 2019-11-29 | 攀钢集团攀枝花钢铁研究院有限公司 | Bloom Properties of Heavy Rail Steel microsegregation control method |
| CN114054710A (en) * | 2021-11-13 | 2022-02-18 | 攀钢集团研究院有限公司 | Method for improving center quality of large-section rectangular continuous casting billet |
| CN114054710B (en) * | 2021-11-13 | 2023-01-20 | 攀钢集团研究院有限公司 | Method for improving center quality of large-section rectangular continuous casting billet |
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