CN108655357A - A kind of metal melting continuous casing - Google Patents
A kind of metal melting continuous casing Download PDFInfo
- Publication number
- CN108655357A CN108655357A CN201710193018.1A CN201710193018A CN108655357A CN 108655357 A CN108655357 A CN 108655357A CN 201710193018 A CN201710193018 A CN 201710193018A CN 108655357 A CN108655357 A CN 108655357A
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- Prior art keywords
- strand
- molten steel
- temperature
- crystallizer
- solid
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Classifications
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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
-
- 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
- B22D11/041—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds for vertical casting
-
- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
A kind of metal melting continuous casing; it is characterized in that; after molten metal melting; it is continuously poured into excessive tundish under low overheat, molten steel is heated in excessive tundish and stirring action gradually forms semi-solid-state metal liquid, and semi-solid-state metal liquid is injected into casting machine crystallizer in argon atmosphere; it is cooled in crystallizer; the strand solidified completely is formed, is cut when strand reaches certain length, is then transmitted strand extraction by dummy device.According to the present invention, directly semi-solid steel is injected into crystallizer, is cooled into as solid strand, whole process increases equiax crystal, thinning microstructure almost without the diffusion of solute to reduce the element segregation of strand；Entire semisolid continuous casting process is low without turbulent flow, temperature, and setting time is short, and production efficiency is high.And casting billet surface flat smooth, dense internal organization, crystal grain are tiny, mechanical property is good, strand dimensional accuracy is high.
Description
Technical field
The present invention relates to a kind of continuously casting new method improving the inside and outside quality of strand, this method will greatly change
Kind Inner Quality of Billet, reduces the internal flaws such as strand center porosity, shrinkage cavity and segregation, while can also improve strand outer surface
Quality.
The prior art
In the production process of metallurgical continuous casting, inside and the external mass of strand are the cokes that metallargist extremely pays close attention to
Point.It is uniform that the internal soundness of strand is mainly manifested in ingredient, without it is loose, without shrinkage cavity, flawless etc., it is desirable to produce inside strand
The flawless product of dense structure.And the Producing reason of these defects, on the one hand it is the nature that molten steel occurs in process of setting
It shrinks, is on the other hand that the setting of casting parameters is related, such as section is big, cast temperature, cooling system and roll gap are arranged
Be not suitable for.And the external mass of strand is then because of Oscillation Scratch On Surface of Concasting caused by Billet and vibration and covering slag, folder
Slag and crackle.External transverse crack and corner crack then occurs because of the effect of external mechanical force in continuous casting machine fan-shaped segment.This
A little defects are all because the design and producing method of existing conticaster determines, and very that is avoided.
Currently used modern conticaster was invented and is used in the forties in 19th century, which includes vibration water cooling knot
The key technologies such as brilliant device, submersed nozzle, covering slag.The technology uses till now always, and big frame does not have to change substantially
Become.And it is all closely related to solid strand process with molten steel to generate a series of slab quality defect, that is, it is most
Slab quality problem be occur in solidification of molten steel process, including strand is loose, shrinkage cavity, segregation and crackle.And the appearance of strand
Face oscillation mark is then in mold oscillation, and green shell is weak related.Slab surface crack is then related to the bending of casting machine and straightening deformation.
If there is a kind of casting process, molten steel liquid to solid-state process can be cancelled, directly from two-phase section to Solid State Transformation, then can simplify
The diffusion for falling molten steel solute, also just without element segregation.Bending and the straightening process for removing casting process again, then can drop significantly
The low crackle that firmly surface is generated by mechanically deform.
CN103648687A proposes a kind of method and vertical casting machine for manufacturing heavy slab by metal melt, is used for
The method that heavy slab is manufactured by metal melt.Continuous casting steel billet of the cast with the wick-containing for being still liquid in vertical crystallizer,
Continue to guide continuous casting steel billet in the subsequent strand guide mechanism with multiple strand guide sections, continuous casting steel billet is complete
Device to be cut is cut into the slab of certain length after full solidification, and then slab exports.
CN104128588B proposes that a kind of semisolid continuous casting of composite bearing is connect with electro-magnetic forming.A kind of composite bearing
Semisolid continuous casting and electro-magnetic forming attachment device, warmed-up type is respectively put by ready semi-solid blank and bearing shell steel back
Then chamber molds, squeeze and fill type and pressurize, finally mold pickup.
It can be seen that, semi-solid casting has many reports in non-ferrous metals casting, and is all not from document and data
Continuously casting, mostly based on ingot casting and mold molding.And then belonging to emerging technology in iron and steel domain, research is less.It is developed
A kind of semisolid continuous casting method of steel then can be very good the internal soundness for solving the problems, such as strand, reduces segregation, reduces shrinkage cavity
With it is loose.Obtain even tissue, the external high quality strand without oscillation mark and crackle,
Therefore the present invention proposes that a kind of semisolid suppresses semi-continuous casting method.
Invention content
This method provide it is a kind of cancel Liquid-solid conversion continuous cast method, a kind of metal melting continuous casing, directly
Semi-solid steel is injected into crystallizer, so that it is changed into solid strand by cooling, whole process almost without solute diffusion,
To reduce the element segregation of strand, increase equiax crystal, thinning microstructure.Entire semisolid continuous casting process is low without turbulent flow, temperature, coagulates
Gu the time is short, production efficiency is high.And casting billet surface flat smooth, dense internal organization, crystal grain are tiny, mechanical property is good, strand
Dimensional accuracy is high.
Technical solution of the present invention is as follows：
A kind of metal melting continuous casing, which is characterized in that
It after molten metal melting, is continuously poured into excessive tundish under low overheat, the steel in excessive tundish
Liquid is heated and stirring action gradually forms semi-solid-state metal liquid,
Semi-solid-state metal liquid is injected into casting machine crystallizer in argon atmosphere, is cooled in crystallizer,
The strand solidified completely is formed, is cut when strand reaches certain length, then strand is drawn by dummy device and is carried out
Transmission.
It first after molten metal melting, is continuously poured into excessive tundish under the lower degree of superheat, in excessively
Between wrap in molten steel is heated and stirring action gradually forms semi-solid-state metal liquid,
Semi-solid-state metal liquid is injected into casting machine crystallizer in argon atmosphere, is cooled in crystallizer,
The strand solidified completely is formed, is cut when strand reaches certain length, then strand is drawn by dummy device and is carried out
Transmission.
According to a kind of metal melting continuous casing of the present invention, which is characterized in that
Semi-solid-state metal liquid is poured into after crystallizer to the blank for forming definite shape.
According to a kind of metal melting continuous casing of the present invention, which is characterized in that
It is rectangle, square or circle that semi-solid-state metal liquid is poured into the blank shape formed after crystallizer.
According to a kind of metal melting continuous casing of the present invention, which is characterized in that
Control molten steel temperature so that molten steel in ladle with the transport of 5-20 DEG C of low overheat, when molten steel temperature is close to liquid phase
When line temperature, i.e. temperature drop to close to 3-5 DEG C of liquidus temperature, the excessive centre of preheating is entered in argon atmosphere
Packet.
According to a kind of metal melting continuous casing of the present invention, which is characterized in that
The preheating temperature of the excessive tundish of the preheating is at 1200-1300 DEG C.
According to a kind of metal melting continuous casing of the present invention, which is characterized in that
After the molten steel of flowing is cast to the excessive tundish of argon atmospher, Slow cooling, molten steel are carried out in the excessive tundish
Temperature is slowly drop down to liquidus temperature.
According to a kind of metal melting continuous casing of the present invention, which is characterized in that
During molten steel temperature slowly declines, in order to avoid molten steel local overcooling solidifies, outside is heated and is stirred
Molten steel in two-phase section is injected into the process in crystallizer by big channel current distribution device and is constantly in argon gas protection shape by protection
State avoids molten steel from being aoxidized.
According to a kind of metal melting continuous casing of the present invention, which is characterized in that
The molten steel in two-phase section, which refers to, keeps molten metal temperature to be between solidus and liquidus temperature.
According to a kind of metal melting continuous casing of the present invention, during molten steel temperature slowly declines, in order to
Molten steel local overcooling is avoided to solidify, protection is heated and stirred in outside, and the molten steel in two-phase section (is kept molten metal temperature
Between solidus and liquidus temperature) by big channel current distribution device be injected into the process in crystallizer be constantly in argon gas protect
Shield state avoids molten steel from being aoxidized.
According to a kind of metal melting continuous casing of the present invention, in traditional continuous casting process, molten metal is with liquid
State enters crystallizer, and in semisolid continuous casting process, metal bath enters crystallizer with the state of solid-liquid two-phase coexistent, skill
Art key includes the semisolid molten steel that temperature is stablized, the injection of semisolid molten steel, the solidifying system of strand.
In traditional continuous casting process, molten metal enters crystallizer with liquid, and in semisolid continuous casting process, metal is molten
Body enters crystallizer with the state of solid-liquid two-phase coexistent.Its key problem in technology includes the semi-solid-state metal hydraulic control system that temperature is stablized, partly
The injection of solid metallic liquid and the process of setting of molten metal.The principle of the invention is：Stringent control molten metal temperature, entire
Continuous temperature measurement is carried out to molten metal in production process.Molten metal is in big packet 1 with 5-20 DEG C of transport of low overheat.Real time monitoring is big
Molten metal temperature in packet is entered in argon gas protection by diversion pipe 2 when temperature drops to close to 3-5 DEG C of liquidus temperature
Into the I types tundish 3 of preheating.Molten metal temperature in tundish 3 slowly declines, in order to avoid condensation occurred for molten metal
Gu when molten metal is into the channel for crossing tundish 3, is stirred and heated, kept at molten metal temperature using heating stirrer 4
Between solidus and liquidus temperature.Molten metal in two-phase section is injected by expanded letter current distribution device 5 in crystallizer 6,
The process is constantly in argon gas guard mode, and molten metal is avoided to be aoxidized.To avoid molten metal from entering too fast solidification in crystallizer,
The cooling water tank 7 of crystallizer 6 need to use preheating water.Molten metal carries out the solidification from two-phase section to solid phase in crystallizer 6, makes casting
Base tissue reaches fine and close.Then by strand, mouth is drawn strand by turnover driving device 11 under equipment.It is poured using the technique
The casting blank inner organization of casting is fine and close, without loose shrinkage cavity, segregation-free.Strand external mass is excellent, because without the machines such as bending and aligning
Tool deforms, casting billet surface flawless.
Advantageous effect
Compared with conventional continuous casting, this method is cast using the molten steel in two-phase section, and the casting crystallizer is long
Degree reach strand final products length, molten steel flow is weaker in casting process, will not lead to turbulent motion, the casting process without
Covering slag consumes.Furthermore it is inside and outside superior in quality using the strand that this method produces, it can be to avoid caused by traditional continuous casting
The problems such as external crackle, surface are mingled with, inner inclusion, center porosity, microstructure segregation.Strand from crystallizer come out after to final complete
It is also greatly shortened the time required to full solidification, casting machine length also shortens.
Description of the drawings
Fig. 1 is semisolid vertical continuous casting schematic device of the present invention.
In figure, 1 is big packet, and 2 be diversion pipe, and 3 be I type tundish, and 4 be heater blender, and 5 be expanded letter current distribution device, and 6 are
Crystallizer, 7 be cooling water tank, and 8 be guide roller, and 9 be strand, and 10 be cutting gun, and 11 be turnover driving device.
Specific implementation mode
Embodiment
A kind of metal semi-solid continuous cast method carries out semi-continuous casting, the strand of this method production using semi-solid-state metal
Internal soundness and external mass are very excellent, a variety of casting blank defects that can cause to avoid traditional continuous casting.
The equipment that the method for the present embodiment uses is as shown in Figure 1, the equipment has big packet 1, diversion pipe 2, I types tundish 3, adds
Hot device blender 4, expanded letter current distribution device 5, crystallizer 6, cooling water tank 7, strand 9, guide roller 8, cutting gun 10 and transmission dress of tumbling
Set 11 compositions.
Big packet 1 holds the metal liquid of pending casting, which has continuous thermometering device, is kept the temperature in transportational process
Degree is higher than 5-20 DEG C of liquidus temperature, uninterrupted to detect molten metal temperature, when molten metal is cooled to close to metal liquidus curve 3-5
DEG C when, metal liquid is injected by diversion pipe 2 in I types tundish 3.
I types tundish 3 need to preheat in advance, avoid molten metal that fast cooling occurs.I types tundish 3 has good heat preservation
Effect, and carry thermometric, heating and agitating device.When channel of the molten metal by I types tundish 3, heating stirrer 4 is to gold
Belong to liquid to stir and heat so that metal liquid temperature is always held between metal solidus and liquidus curve, and stirring makes it
Keep certain mobility.
3 avoid metal liquid from being aoxidized using inert gas shielding in tundish.Molten metal passes through expanded letter cloth from tundish 3
Stream device 5 is injected into the case of protective atmosphere in crystallizer 6.The throughput of 5 more general continuous casting sprue of expanded letter cloth flow tube is big
It is more, be an expanded letter structure so that metal liquid flows rapidly into crystallizer.Crystallizer 6, which needs to preheat in advance, avoids metal
Liquid fast cooling.
The cooling of metal liquid cooling water tank 7 around in crystallizer 6, the cooling water in cooling water tank 7 need pre-
Heat, temperature are higher than 30 DEG C, and the molten metal of two-phase section forms certain thickness complete solidified shell in crystallizer 6.Because of raw material
For semisolid, therefore strand can solidify completely in a short time.The strand 9 of solidification enters guide roller 8.When strand 9 reaches
After certain length, strand 9 is cut using cutting gun 10, is then sent out the strand cut using tipple 11.Cause
For entire production process, strand is solidified below liquidus curve, and flowing is weaker, so as to avoid loose inside strand and
Segregation.And the process strand is without the deformation process for being bent and aligning, the defects of strand not will produce external crackle.
According to the present invention, compared with conventional continuous casting, cast using the molten steel in two-phase section, casting crystallization
Device length reaches strand final products length, and molten steel flow is weaker in casting process, will not lead to turbulent motion, the casting
Journey unprotect slag consumes.Furthermore it is inside and outside superior in quality using the strand that this method produces, it can be led to avoid traditional continuous casting
The problems such as external crackle of cause, surface are mingled with, inner inclusion, center porosity, microstructure segregation.Strand from crystallizer come out after to most
It is also greatly shortened the time required to solidification completely eventually, casting machine length also shortens.
Claims (8)
1. a kind of metal melting continuous casing, which is characterized in that
After molten metal melting, continuously poured into excessive tundish under low overheat, in excessive tundish molten steel by
Semi-solid-state metal liquid is gradually formed to heating and stirring action,
Semi-solid-state metal liquid is injected into casting machine crystallizer in argon atmosphere, is cooled in crystallizer, is formed
The strand solidified completely, is cut when strand reaches certain length, is then transmitted strand extraction by dummy device.
2. a kind of metal melting continuous casing as described in claim 1, which is characterized in that
Semi-solid-state metal liquid is poured into after crystallizer to the blank for forming definite shape.
3. a kind of metal melting continuous casing as claimed in claim 2, which is characterized in that
It is rectangle, square or circle that semi-solid-state metal liquid is poured into the blank shape formed after crystallizer.
4. a kind of metal melting continuous casing as described in claim 1, which is characterized in that
Control molten steel temperature so that molten steel in ladle with the transport of 5-20 DEG C of low overheat, when molten steel temperature is close to liquidus curve temperature
When degree, i.e. temperature drop to close to 3-5 DEG C of liquidus temperature, the excessive tundish of preheating is entered in argon atmosphere.
5. a kind of metal melting continuous casing as claimed in claim 4, which is characterized in that
The preheating temperature of the excessive tundish of the preheating is at 1200-1300 DEG C.
6. a kind of metal melting continuous casing as described in claim 1, which is characterized in that
After the molten steel of flowing is cast to the excessive tundish of argon atmospher, Slow cooling, molten steel temperature are carried out in the excessive tundish
It is slowly drop down to liquidus temperature.
7. a kind of metal melting continuous casing as described in claim 1, which is characterized in that
During molten steel temperature slowly declines, in order to avoid molten steel local overcooling solidifies, protection is heated and stirred in outside,
Molten steel in two-phase section is injected into the process in crystallizer by big channel current distribution device and is constantly in argon gas guard mode, is kept away
Exempt from molten steel to be aoxidized.
8. a kind of metal melting continuous casing as claimed in claim 7, which is characterized in that
The molten steel in two-phase section, which refers to, keeps molten metal temperature to be between solidus and liquidus temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710193018.1A CN108655357A (en) | 2017-03-28 | 2017-03-28 | A kind of metal melting continuous casing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710193018.1A CN108655357A (en) | 2017-03-28 | 2017-03-28 | A kind of metal melting continuous casing |
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| CN108655357A true CN108655357A (en) | 2018-10-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710193018.1A Pending CN108655357A (en) | 2017-03-28 | 2017-03-28 | A kind of metal melting continuous casing |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113634724A (en) * | 2020-05-10 | 2021-11-12 | 昆山祁御新材料科技有限公司 | Method and device for preparing superfine high-purity metal blank |
| CN113857446A (en) * | 2021-09-28 | 2021-12-31 | 张明 | Metal casting and continuous rolling method and equipment for crystallizer melt distribution and heat exchange separation |
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| JPS55117555A (en) * | 1979-02-26 | 1980-09-09 | Itt | Device for manufacturing thixotropic metallic slurry |
| JPH01192446A (en) * | 1988-01-26 | 1989-08-02 | Kawasaki Steel Corp | Apparatus for continuously producing semi-solidified metal |
| CN1293088A (en) * | 2000-09-29 | 2001-05-02 | 清华大学 | Technology for manufacturing circular alloy blank used for semi-solid processing |
| CN2438526Y (en) * | 2000-09-29 | 2001-07-11 | 清华大学 | Continuous casting apparatus of alloy round blank for semi-solid processing |
| JP2005288445A (en) * | 2004-03-31 | 2005-10-20 | Chunpyo Hong | Apparatus for producing solid-liquid-coexisting state metallic material |
| KR20060010619A (en) * | 2004-07-28 | 2006-02-02 | 오일광 | Continuous fabrication equipment of rheology material with continuous rotational pressure automatic control type |
-
2017
- 2017-03-28 CN CN201710193018.1A patent/CN108655357A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55117555A (en) * | 1979-02-26 | 1980-09-09 | Itt | Device for manufacturing thixotropic metallic slurry |
| JPH01192446A (en) * | 1988-01-26 | 1989-08-02 | Kawasaki Steel Corp | Apparatus for continuously producing semi-solidified metal |
| CN1293088A (en) * | 2000-09-29 | 2001-05-02 | 清华大学 | Technology for manufacturing circular alloy blank used for semi-solid processing |
| CN2438526Y (en) * | 2000-09-29 | 2001-07-11 | 清华大学 | Continuous casting apparatus of alloy round blank for semi-solid processing |
| JP2005288445A (en) * | 2004-03-31 | 2005-10-20 | Chunpyo Hong | Apparatus for producing solid-liquid-coexisting state metallic material |
| KR20060010619A (en) * | 2004-07-28 | 2006-02-02 | 오일광 | Continuous fabrication equipment of rheology material with continuous rotational pressure automatic control type |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113634724A (en) * | 2020-05-10 | 2021-11-12 | 昆山祁御新材料科技有限公司 | Method and device for preparing superfine high-purity metal blank |
| CN113857446A (en) * | 2021-09-28 | 2021-12-31 | 张明 | Metal casting and continuous rolling method and equipment for crystallizer melt distribution and heat exchange separation |
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Application publication date: 20181016 |