CN107812906A - Large section Properties of Heavy Rail Steel crystallizer flow field control method - Google Patents
Large section Properties of Heavy Rail Steel crystallizer flow field control method Download PDFInfo
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- CN107812906A CN107812906A CN201711022246.9A CN201711022246A CN107812906A CN 107812906 A CN107812906 A CN 107812906A CN 201711022246 A CN201711022246 A CN 201711022246A CN 107812906 A CN107812906 A CN 107812906A
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- heavy rail
- large section
- rail steel
- flow field
- control method
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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
-
- 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
- B22D11/103—Distributing the molten metal, e.g. using runners, floats, distributors
-
- 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)
- Continuous Casting (AREA)
Abstract
The invention discloses a kind of large section Properties of Heavy Rail Steel crystallizer flow field control method, particularly a kind of large section Properties of Heavy Rail Steel crystallizer flow field control method for being related to field of steel metallurgy.The large section Properties of Heavy Rail Steel crystallizer flow field control method of the present invention, 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 °, mouth of a river external diameter described in submersed nozzle is φ 95mm, internal diameter is φ 45mm, deep-controlled in 100mm to 120mm in the submersed nozzle insertion water.Using the large section Properties of Heavy Rail Steel crystallizer flow field control method of the application, Properties of Heavy Rail Steel crystallizer flow field is stable, liquid level is steady, casting blank shell quality is good, and shell thickness is uniformly distributed vertically, and strand columnar zone develops uniform along width and thickness direction, symmetry is good, the isometric crystalline region symmetry in strand central area is preferable, and low multiple quality norm controlling is more excellent, and corresponding rail superficial dense layer thickness is uniform.
Description
Technical field
The present invention relates to a kind of large section Properties of Heavy Rail Steel crystallizer flow field control method, particularly one kind is related to Ferrous Metallurgy
The large section Properties of Heavy Rail Steel crystallizer flow field control method in field.
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 the invention provides one kind stable so that large section weight so that Mold flow field is effectively ensured
Rail steel casting blank shell thickness is circumferentially uniform, and appearance and size is good, the uniform large section Properties of Heavy Rail Steel knot of casting blank solidification Tissue distribution
Brilliant device flow field control method.
The present invention is large section Properties of Heavy Rail Steel crystallizer flow field control method, large section used by solving the above problems
Properties of Heavy Rail Steel crystallizer uses submersed nozzle, and the submersed nozzle uses double-side-hole, and side opening dips down and thanks 15 °, immersion
Mouth of a river external diameter is φ 95mm, and internal diameter is φ 45mm, deep-controlled in 100mm to 120mm in the submersed nozzle insertion water
Using submersed nozzle, the submersed nozzle uses double-side-hole, and side opening dips down and thanks 15 °, the mouth of a river described in submersed nozzle
External diameter is φ 95mm, and internal diameter is φ 45mm, deep-controlled in 100mm to 120mm in the submersed nozzle insertion water.
It is further that cooling water inflow control is in the range of 3575L/min~3625L/min in crystallization process, hydraulic pressure
Control is in the range of 0.83MP~0.87MP.
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；Casting speed control is in the range of 0.65m/min~0.75m/min.
The beneficial effects of the invention are as follows：Using the large section Properties of Heavy Rail Steel crystallizer flow field control method of the application, heavy rail
Steel crystallizer flow field is stable, and liquid level is steady, and casting blank shell quality is good, and shell thickness is uniformly distributed vertically, other matter of strand
Amount is effectively controlled, and especially strand columnar zone develops uniform along width and thickness direction, and symmetry is good, strand center
The isometric crystalline region symmetry in region is preferable, and low multiple quality norm controlling is more excellent, and corresponding rail superficial dense layer thickness is uniform, other matter
It is all qualified to measure performance.
Embodiment
Large section Properties of Heavy Rail Steel crystallizer flow field control method used by the application, large section Properties of Heavy Rail Steel crystallizer are adopted
With 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, the immersion in the submersed nozzle insertion water
The mouth of a river uses double-side-hole, and side opening dips down and thanks 15 °, and mouth of a river external diameter described in submersed nozzle is φ 95mm, and internal diameter is φ 45mm,
It is deep-controlled in 100mm to 120mm in the submersed nozzle insertion water.The chief of the application is to design suitably
Crystallizer submersed nozzle, the mouth of a river use 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 are controlled in 100mm~120mm, stable so that Mold flow field is effectively ensured,
Essential condition is provided for the uniform and stable growth of solidified shell, while ensures that mold liquid level steadily prevents slag, promotes covering slag
Slag thickness is uniformly distributed；Suitable intensity of cooling is matched to provide the green shell of adequate thickness in crystallizer exit position with supporting steel
Heat of the hydrostatic pressure simultaneous transmission molten steel to external diffusion.
Cooling water inflow control is in the range of 3575L/min~3625L/min in crystallization process, and hydraulic pressure control is in 0.83MP
In the range of~0.87MP.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.In addition to using the big cross section Properties of Heavy Rail Steel continuous casting double-side-hole submersed nozzle of the present invention, production process
It is actual to control the situation to be：Submersed nozzle insertion depth is controlled in 101mm；Crystallizer 3587~3612L/min of cooling water inflow, water
Press 0.84~0.85MPa.Other technological parameters：Actual degree of superheat control range is wrapped in cast as 15 DEG C~25 DEG C, it is average 21 DEG C.
The normal casting speed control of casting process keeps 0.68m/min (constant speed cast) ratios up to 88% in 0.65m/min~0.72m/min.
The stirring intensity of M-EMS is set as 300A, stirring frequency 2.4Hz.
After continuous casting terminates, low power detection is carried out to U71Mn heavy rails steel continuous casting billet；Corroded using cold sour dendrite, detection
Strand cross section shell thickness distribution situation, as a result shows, the Properties of Heavy Rail Steel U71Mn solidification shells that the technological invention is produced are thick
Degree is circumferentially distributed uniformly along section, and overall control is in 15~18mm；Strand corner quality is good, and columnar zone is along width and thickness
Degree direction is developed uniformly, and isometric crystalline region symmetry is preferable, remaining low multiple quality index：0.5~1.0 grade of center porosity, shrinkage cavity 0.5
Level, 0.5 grade of center segregation, no other defect.
Embodiment 2
The embodiment is technical method production large section (320mm*410) U75V of certain steel mill using this technology invention
Heavy rail steel continuous casting billet.In addition to using the big cross section Properties of Heavy Rail Steel continuous casting double-side-hole submersed nozzle of the present invention, production process is actual
The situation is controlled to be：Submersed nozzle insertion depth is controlled in 120mm；Crystallizer 3575~3600L/min of cooling water inflow, hydraulic pressure
0.83~0.85MPa, other technological parameters：Actual degree of superheat control range is wrapped in cast as 18 DEG C~30 DEG C, it is average 24 DEG C.Pour
The normal casting speed control of note process keeps 0.68m/min (constant speed cast) ratios up to 86% in 0.67m/min~0.74m/min.Knot
The stirring intensity of brilliant device electromagnetic agitation is set as 300A, stirring frequency 2.4Hz.
After continuous casting terminates, low power detection is carried out to U75V heavy rails steel continuous casting billet；Corroded using cold sour dendrite, detection casting
Base cross section shell thickness distribution situation, as a result shows, the Properties of Heavy Rail Steel U75V solidification shell thickness that the technological invention is produced
Circumferentially distributed uniformly along section, overall control is in 16~18mm；Strand corner quality is good, and columnar zone is along width and thickness
Direction is developed uniformly, and isometric crystalline region 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, no other defect.
Embodiment 3
The embodiment is technical method production large section (320mm*410) of certain steel mill using this technology invention
U78CrV heavy rail steel continuous casting billets.In addition to using the big cross section Properties of Heavy Rail Steel continuous casting double-side-hole submersed nozzle of the present invention, produced
Cheng Shiji controls the situation to be：Submersed nozzle insertion depth is controlled in 113mm；Crystallizer 3595~3625L/min of cooling water inflow,
0.85~0.87MPa of hydraulic pressure, other technological parameters：Actual degree of superheat control range is wrapped in cast as 18 DEG C~28 DEG C, average 25
℃.The normal casting speed control of casting process reaches in 0.67m/min~0.75m/min, 0.68m/min (constant speed cast) ratio of holding
84%.The stirring intensity of M-EMS is set as 300A, stirring frequency 2.4Hz.
After continuous casting terminates, low power detection is carried out to U78CrV heavy rails steel continuous casting billet；Corroded using cold sour dendrite, detection
Strand cross section shell thickness distribution situation, as a result shows, the Properties of Heavy Rail Steel U78CrV solidification shells that the technological invention is produced
Thickness is circumferentially distributed uniformly along section, and overall control is in 16~17.5mm；Strand corner quality is good, and columnar zone is along width
And thickness direction development is uniform, isometric crystalline region symmetry is preferable, remaining low multiple quality index：0.5~1.0 grade of center porosity, contracting
0.5 grade of hole, 0.5 grade of center segregation, no other defect.
Above-mentioned embodiment explanation, after the invention of this equipment technology, large section (320mm*410mm) Properties of Heavy Rail Steel
Crystallizer flow field is stable, and liquid level is steady, and 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.
Claims (3)
1. large section Properties of Heavy Rail Steel crystallizer flow field control method, it is characterised in that：Large section Properties of Heavy Rail Steel crystallizer is using leaching
Enter the formula mouth of a river, 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 in the submersed nozzle insertion water.
2. large section Properties of Heavy Rail Steel crystallizer flow field control method as claimed in claim 1, it is characterised in that：In crystallization process
Middle cooling water inflow control is in the range of 3575L/min~3625L/min, and hydraulic pressure control is in the range of 0.83MP~0.87MP.
3. large section Properties of Heavy Rail Steel crystallizer flow field control method as claimed in claim 1, it is characterised in that：Pour into a mould molten steel mistake
Temperature is controlled 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；Casting speed control exists
In the range of 0.65m/min~0.75m/min.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711022246.9A CN107812906A (en) | 2017-10-27 | 2017-10-27 | Large section Properties of Heavy Rail Steel crystallizer flow field control method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711022246.9A CN107812906A (en) | 2017-10-27 | 2017-10-27 | Large section Properties of Heavy Rail Steel crystallizer flow field control method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55126355A (en) * | 1979-03-22 | 1980-09-30 | Kawasaki Steel Corp | Nozzle parallel-disposition system continuous casting method |
| JPS61229454A (en) * | 1985-04-04 | 1986-10-13 | Nippon Kokan Kk <Nkk> | Automatic controlling method for molten metal level in mold of continuous casting machine |
| CN105215309A (en) * | 2015-11-11 | 2016-01-06 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of method that big cross section Properties of Heavy Rail Steel center segregation of casting blank controls |
| CN105215310A (en) * | 2015-11-17 | 2016-01-06 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of method that big cross section Properties of Heavy Rail Steel strand center porosity controls |
| CN105234365A (en) * | 2015-11-10 | 2016-01-13 | 攀钢集团攀枝花钢铁研究院有限公司 | Casting method for heavy rail steel casting blank |
-
2017
- 2017-10-27 CN CN201711022246.9A patent/CN107812906A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55126355A (en) * | 1979-03-22 | 1980-09-30 | Kawasaki Steel Corp | Nozzle parallel-disposition system continuous casting method |
| JPS61229454A (en) * | 1985-04-04 | 1986-10-13 | Nippon Kokan Kk <Nkk> | Automatic controlling method for molten metal level in mold of continuous casting machine |
| CN105234365A (en) * | 2015-11-10 | 2016-01-13 | 攀钢集团攀枝花钢铁研究院有限公司 | Casting method for heavy rail steel casting blank |
| CN105215309A (en) * | 2015-11-11 | 2016-01-06 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of method that big cross section Properties of Heavy Rail Steel center segregation of casting blank controls |
| CN105215310A (en) * | 2015-11-17 | 2016-01-06 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of method that big cross section Properties of Heavy Rail Steel strand center porosity controls |
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| 周川生等: "《连铸"三大件"生产与使用：整体塞棒、长水口、浸入式水口》", 31 January 2015, 冶金工业出版社 * |
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