CN110181011A - A kind of method and its system improving Continuous Casting Square, round billet surface quality - Google Patents
A kind of method and its system improving Continuous Casting Square, round billet surface quality Download PDFInfo
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- CN110181011A CN110181011A CN201910553683.6A CN201910553683A CN110181011A CN 110181011 A CN110181011 A CN 110181011A CN 201910553683 A CN201910553683 A CN 201910553683A CN 110181011 A CN110181011 A CN 110181011A
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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
- B22D11/108—Feeding additives, powders, or the like
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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
- B22D11/111—Treating the molten metal by using protecting powders
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Abstract
The present invention provides a kind of raising Continuous Casting Squares, the method and its system of round billet surface quality, belong to steelmaking technical field.The following steps are included: covering slag is mixed with carrier gas, gas-solid mixture is obtained；Continuous Casting Square, round billet are formed after being sprayed onto molten steel liquid level after gas-solid mixture heating, then by the solidification of molten steel；Heat loss through radiation of the heat source from molten steel of the gas-solid mixture heating.The present invention heats up to covering slag using the heat of molten steel, when the covering slag after heating is sprayed onto molten steel liquid level, will not largely absorb the heat of molten steel；Simultaneously; covering slag is under the impetus of gas; the solid-state covering slag of heating continuously, is equably sprayed onto molten steel liquid level; avoid the molten steel liquid level locally non-uniform disadvantage of heat dissipation; improve molten steel initial solidification state; molten steel crackle tendency in process of setting is reduced, the surface quality of Continuous Casting Square, round billet is improved.
Description
Technical field
The present invention relates to steelmaking technical field more particularly to it is a kind of improve Continuous Casting Square, round billet surface quality method and its
System.
Background technique
Continuous casting covering slag is the important metallurgic auxiliary materials of continuous casting process, and the physicochemical property of covering slag can largely determine to cast
The surface quality of base.The metallurgy action of covering slag include molten steel face adiabatic heat-insulation, isolation air prevent molten steel secondary oxidation, green shell
Lubrication between crystallizer wall, the field trash in absorption molten steel, control Billet are to improve slab quality.
Surface quality of continuously cast slab control is a complicated systems engineering, but surface quality problems are initial originating from crystallizer
Solidification stages are indubitable.The initial solidification stage, under strong cold and green shell solidification shrinkage the double action of crystallizer, first green compact
Shell temperature can rapid drawdown rise sharply, especially throwing when huge frictional force, stress can be generated between initial solidification shell and crystallizer copper wall
Uneven green shell easily cracks.Theory and practice shows that the temperature for improving initial solidification shell can effectively ensure that initial solidification shell temperature
The uniformity of field and stress field is spent, and then controls the germinating of crackle.
Improving the common method of initial solidification shell temperature includes under Hot-Top mould technology, thin slab mold cooling water into upper
Mode and liquid covering slag placingJi Shu etc. out.The above method can improve initial solidification temperature to a certain extent, especially
The casting of liquid covering slag can effectively reduce the crystallizer meniscus molten steel heat that covering slag fusing is absorbed heat and taken away.But above-mentioned side
There is also certain problems for method, and if Hot-Top mould investment is big but effect is unobvious, crystallizer cooling water bottom in and top out is only thin
In sheet billet continuous casting be applicable in, liquid high temperature protection slag casting additional huge heating device and Adding Way in industrial practice also
To further study and improve.
Summary of the invention
In view of the above-mentioned problems, the present invention proposes a kind of method and its system for improving Continuous Casting Square, round billet surface quality, this hair
Bright method is heated covering slag using the heat that molten steel radiation generates, and the covering slag after heating is sprayed onto molten steel liquid level, is improved
Molten steel initial solidification state improves Continuous Casting Square, round billet surface quality.
In order to achieve the above-mentioned object of the invention, the present invention the following technical schemes are provided:
The present invention provides a kind of method for improving Continuous Casting Square, round billet surface quality, comprising the following steps:
Covering slag is mixed with carrier gas, obtains gas-solid mixture；Molten steel liquid level will be sprayed onto after gas-solid mixture heating
Afterwards；The solidification of molten steel is formed into Continuous Casting Square, round billet again；
Heat loss through radiation of the heat source from molten steel of the gas-solid mixture heating.
Preferably, the flow of the carrier gas is 5~15L/min.
Preferably, the charging rate of the covering slag is 15~20kg/h.
Preferably, the distance between gas-solid mixture and molten steel liquid level are 50~80mm after the heating.
The present invention also provides a kind of raising Continuous Casting Squares, the system of round billet surface quality, including gas source, the stream being sequentially communicated
Meter, dispenser, submersed nozzle and crystallizer；The dispenser is also connected to covering slag weighing pot；The gas source, flow
Pass through connection by metal hose between meter, dispenser and submersed nozzle；The submersed nozzle is inserted into the crystallizer；Institute
Submersed nozzle is stated with covering slag heating system.
Preferably, the supply gas pressure of the gas source is 0.10~0.20MPa.
Preferably, the submersed nozzle includes the perforative molten steel runner pipe in center, is wrapped in outside molten steel runner pipe
Mouth of a river wall is arranged on the outside of the mouth of a river wall between molten steel runner pipe and the covering slag parallel with molten steel runner pipe heating is logical
Road, the blending bunker being arranged on the outside of the mouth of a river wall；One end setting covering slag in covering slag heating channel heats channel and enters
Mouthful, the other end is arranged covering slag and heats channel outlet, and the covering slag heating feeder connection and covering slag heating channel go out
Mouth is angled with covering slag heating channel and is communicated on the outside of the mouth of a river wall；Covering slag heating feeder connection with
The blending bunker connects, and interface is arranged on the blending bunker；Molten steel runner pipe one end is molten steel entrance, the other end is molten steel
Outlet.
Preferably, the diameter in covering slag heating channel is 5~8mm, and length is 35~45mm.
Preferably, the center line of the center line of the covering slag heating feeder connection and the submersed nozzle vertical direction
Angle be 45~55 °；The center line of the covering slag heating channel outlet and the center of the submersed nozzle vertical direction
The angle of line is 50~75 °.
Preferably, it is 80~120mm that the submersed nozzle, which is inserted into the depth of Mold,.
The present invention provides it is a kind of raising Continuous Casting Square, round billet surface quality method, comprising the following steps: by covering slag with
Carrier gas mixing, obtains gas-solid mixture；After being sprayed onto molten steel liquid level after gas-solid mixture heating, then by the solidification of molten steel
Form Continuous Casting Square, round billet；Heat loss through radiation of the heat source from molten steel of the gas-solid mixture heating.The present invention is radiated using molten steel
The heat of generation heats covering slag, and when the covering slag after preheating is sprayed onto molten steel liquid level, covering slag will not be big when subsequent melting
Amount absorbs the heat of molten steel；Meanwhile the covering slag after preheating can float on molten steel surface and form continuous media, and it is empty to play isolation
Gas, the effect for preventing molten steel secondary oxidation；In addition, covering slag is under the impetus of gas, the covering slag after heating is continuous
Ground is equably sprayed onto molten steel liquid level, along the non-uniform influence of the circumferential part heat dissipation of initial solidification shell when alleviating solidification of molten steel, makes molten steel
Crackle tendency reduces in process of setting, improves the surface quality of Continuous Casting Square, round billet.Covering slag is directly added compared to traditional
Enter into molten steel, it is of the invention due to the technical solution that the fusing of covering slag can make local molten steel temperature reduce by 10~15 DEG C
Method is sprayed onto molten steel surface after heating covering slag again, reduces covering slag because of molten steel temperature fall caused by melting, most
Eventually improve Continuous Casting Square, round billet shows quality；Meanwhile operating method provided by the invention using waste heat, it is simple to operation, at
This is low.
The present invention also provides the system for improving Continuous Casting Square, round billet surface quality, system of the invention can add covering slag
Heat, and the covering slag after heating is transported to crystallizer molten steel surface under the action of carrier gas, it takes full advantage of molten steel radiation and produces
Raw heat heats covering slag, improves resource utilization；After covering slag is added to molten steel surface after heating simultaneously, Bu Hui great
Width reduces the temperature of molten steel, greatly improves the surface matter of the crack sensitivities steel grade such as continuous casting billet, especially peritectic steel, micro alloyed steel
Amount.
Detailed description of the invention
Fig. 1 is the system connection schematic diagram that the present invention improves Continuous Casting Square, round billet surface quality；
Fig. 2 is the structure chart of submersed nozzle in the present invention, wherein 1 is molten steel runner pipe, and 1-1 is molten steel entrance, 1-2
It is mouth of a river wall for molten steel outlet, 2,3 heat channel for covering slag, and 3-1 is that covering slag heats feeder connection, and 3-2 is heating channel
Outlet, 4 be blending bunker, and 4-1 is interface.
Specific embodiment
The present invention provides a kind of raising Continuous Casting Squares, the method for round billet surface quality, comprising the following steps:
Covering slag is mixed with carrier gas, obtains gas-solid mixture；Molten steel liquid level will be sprayed onto after gas-solid mixture heating
Afterwards；The solidification of molten steel is formed into Continuous Casting Square, round billet again；
Heat loss through radiation of the heat source from molten steel of the gas-solid mixture heating.
In the present invention, the carrier gas preferably includes nitrogen, argon gas or air；In the present invention, the gas of the carrier gas
Body flow heating temperature required by covering slag is determined, while the air-flow that the flow of carrier gas generates is unable to vigorous agitation molten steel
Liquid level prevents molten steel from exposing in air；In a specific embodiment of the present invention, the gas flow of the carrier gas be preferably 5~
15L/min.In the present invention, the main function of the carrier gas is conveying covering slag；When covering slag forms stabilization on molten steel surface
Slag blanket after, although there may be oxygen in carrier gas (air), since the presence of slag blanket can equally play molten steel isolation
The purpose of air.
In the present invention, the charging rate of the covering slag is preferably 15~20kg/h.
In the present invention, the distance between gas-solid mixture and molten steel liquid level are preferably 50~80mm after the heating.
The present invention is not specifically limited the type of covering slag and molten steel, and those skilled in the art carry out according to actual needs
Selection, in a specific embodiment of the present invention, the molten steel are preferably SCM435, ML08Al or automatic steel 1215；When
Molten steel is SCM435, and covering slag is preferably medium carbon steel covering slag, and when molten steel is ML08Al, covering slag is preferably mild steel protection
Slag, when molten steel is automatic steel 1215, covering slag is preferably low-carbon restitutive protection's slag.In the present invention, the SCM435,
The physicochemical property of ML08Al or the corresponding covering slag of automatic steel 1215 is as shown in table 1.
1 covering slag physical and chemical index of table
Covering slag is added in molten steel, the heat that covering slag can absorb molten steel starts to melt, meeting after solidification of molten steel is shunk
It is formed air gap (between steel solidified shell and crystallizer copper wall), the covering slag of fusing can enter in air gap to slab in crystallizer
Interior drawing (demoulding) plays lubricating action.Obviously, using method of the invention, molten steel liquid level is sprayed onto after heating covering slag
Afterwards, covering slag will not absorb the excessive heat of molten steel liquid level and can melt；Moreover, under the impetus of gas, gas-solid mixture
Uniformly, it is constantly sprayed onto molten steel surface, the molten steel liquid level locally non-uniform disadvantage of heat dissipation is avoided, improves molten steel initial solidification
Temperature, make molten steel in process of setting crackle tendency reduce, improve the surface quality of Continuous Casting Square, round billet.
The present invention also provides a kind of raising Continuous Casting Squares, the system of round billet surface quality.Below with reference to Fig. 1, this hair is described
The system for improving Continuous Casting Square, round billet surface quality of bright offer；It is described improve Continuous Casting Square, round billet surface quality system include according to
Gas source, flowmeter, dispenser, submersed nozzle and the crystallizer of secondary connection；The dispenser is connect with covering slag weighing pot；Institute
Submersed nozzle is stated to be inserted into the crystallizer；Pass through metal between the gas source, flowmeter, dispenser and submersed nozzle
Hose connection；The submersed nozzle has covering slag heating system.
System provided by the invention includes gas source, and the supply gas pressure of the gas source is preferably 0.10~0.20MPa, further
Preferably 0.11~0.18MPa, more preferably 0.12~0.15MPa；The gas source is preferably by Ar gas cylinder, N2Gas cylinder or compression are empty
Mechanism of qi provides.In the present invention, the gas source can continuously provide carrier gas, continuously transport covering slag and immersed by heated type
The formula mouth of a river is simultaneously added to crystallizer molten steel surface.
System provided by the invention includes flowmeter；The purpose of the flowmeter is the stream of carrier gas in accurate monitoring system
Speed makes molten steel liquid level in the not strong agitated batch crystallizer of the carrier gas mixed with covering slag.
System provided by the invention includes dispenser；The dispenser is preferably vibra feeder or screw feeder；This
The dispenser of invention can be continually provided covering slag, mix it in flowing with the carrier gas with certain flow rate.In this hair
In bright, the dispenser is also connect with covering slag weighing pot；The material of the covering slag weighing pot is preferably stainless steel；The guarantor
Shield slag weighing pot, which preferably uses, to be sealed.Covering slag weighing pot of the invention can prevent tank body to be oxidized to Fe2O3(FeO or
Fe3O4) etc. ferriferous oxides pollute covering slag.
In the present invention, covering slag can be stored and be weighed to the covering slag weighing pot, cooperate dispenser, realize covering slag
The accurate control of additional amount, and continuously supply covering slag.
System provided by the invention includes submersed nozzle；The submersed nozzle has covering slag heating system；It is described
The material of submersed nozzle is preferably quartziferous, magnesium carbonaceous or aluminium carbonaceous.
The structural schematic diagram of submersed nozzle is described in detail below with reference to Fig. 2.In the present invention, the submersed nozzle
It preferably includes: including the perforative molten steel runner pipe 1 in center, the mouth of a river wall 2 being wrapped in outside the molten steel runner pipe, being arranged in institute
State on the outside of mouth of a river wall between the molten steel runner pipe and covering slag heating channel 3 parallel with molten steel runner pipe, be arranged in the water
Blending bunker 4 on the outside of mouth wall；One end setting covering slag in covering slag heating channel heats feeder connection 3-1, and the other end is set
Covering slag heating channel outlet 3-2 is set, the covering slag heating feeder connection 3-1 and the covering slag heat channel outlet 3-2
It is angled with covering slag heating channel 3 and be communicated to 2 outside of the mouth of a river wall；The covering slag heats feeder connection 3-
1 connect with the blending bunker 4, is provided with interface 4-1 on the blending bunker 4；Described 1 one end of molten steel runner pipe is molten steel entrance 1-
1, the other end is that molten steel exports 1-2.
In the present invention, molten steel is consistent with the circulating direction of covering slag in the submersed nozzle.
In the present invention, the length and diameter of the molten steel runner pipe is determined by the continuous casting billet type of actual production；?
In specific embodiments of the present invention, the diameter of the molten steel runner pipe is preferably 25~40mm；The length of the molten steel runner pipe
Preferably 800~1100mm, i.e. molten steel entrance to molten steel outlet the distance between；The length of the molten steel runner pipe is also simultaneously
The length of the submersed nozzle with covering slag heating system.
In the present invention, the thickness of the mouth of a river wall is preferably 20~35mm.
In the present invention, the distance between the center line in covering slag heating channel and molten steel circulation tube hub line are preferred
For 15~30mm.
In the present invention, the diameter in covering slag heating channel is preferably 5~8mm, and length is preferably 35~45mm.?
In the present invention, covering slag heating the distance between the feeder connection and the molten steel entrance are preferably 250~350mm.
In the present invention, in the center line and the submersed nozzle vertical direction of the covering slag heating feeder connection
The angle of heart line is preferably 45~55 °.In the present invention, the covering slag heating channel outlet center line and submersed nozzle hang down
The corner dimension of straight direction center line is determined by crystallizer internal cavity sectional dimension, in a specific embodiment of the present invention, described to state
It is preferably 50~75 ° that covering slag, which heats channel outlet center line and the angle of submersed nozzle vertical direction center line, the angle
The setting of angle avoids the disturbance of covering slag and carrier gas to Mold liquid level.
System provided by the invention includes crystallizer, and the present invention does not do specific limit to the structure and type of the crystallizer
Fixed, those skilled in the art select according to actual needs.In the present invention, the submersed nozzle is inserted into described
In crystallizer；The depth that the submersed nozzle is inserted into Mold is preferably 80~120mm, that is to say, that immersion
The depth that mouth of a river molten steel exit is inserted into Mold is preferably 80~120mm.In the present invention, the covering slag adds
The distance between passage of heat outlet and Mold liquid level preferably 50~80mm, that is to say, that covering slag and steel after heating
The distance between liquid liquid level is preferably 50~80mm.
In the present invention, in the system between gas source, flowmeter, dispenser and submersed nozzle, the dispenser and
Preferably pass through connection by metal hose between covering slag weighing pot；The diameter of the metal hose is preferably 20~35mm.
In the present invention, the process that the system uses is preferred are as follows: opens gas source and persistently provides flow constant carrier gas, together
When covering slag accurately weighed by covering slag weighing pot, and covering slag is persistently fed by dispenser, carrier gas and covering slag is made to exist
Carries out just mixed in dispenser, keeps system micro-positive pressure (preventing air-flow from returning in covering slag weighing pot) in flowing, make carrier gas with
The gas-solid mixture that covering slag is formed enters the blending bunker of submersed nozzle, under the promotion of carrier gas, gas-solid by metal hose
The covering slag heating channel that mixture enters submersed nozzle is heated, and after covering slag heating channel outlet comes out, is sprayed onto
Molten steel ullage in crystallizer forms continuous media, plays the role of protecting molten steel；Then recycle crystallizer by molten steel
Solidification.
It is carried out below with reference to method and its system of the embodiment to raising Continuous Casting Square provided by the invention, round billet surface quality
Detailed description, but they cannot be interpreted as limiting the scope of the present invention.
Embodiment 1
According to the parameter of Fig. 1 and schematic diagram shown in Fig. 2 setting system and submersed nozzle, in which: the immersion water
The material of mouth is corundum；The length of the molten steel runner pipe is 750mm, diameter 25mm；Mouth of a river wall with a thickness of 30mm；Institute
The distance between covering slag heating channel centerline and molten steel circulation tube hub line are stated as 20mm；The covering slag heating is logical
The diameter in road is 6mm, length 400mm；The entrance and submersed nozzle vertical direction center line in covering slag heating channel
Angle be 45 °, covering slag heating channel outlet center line and the angle of submersed nozzle vertical direction center line are
55°；The diameter of metal hose is 25mm；
Casting molten steel is automatic steel 1215,150 × 150mm of Cross Section of CC Billet2, conticaster pulling rate 2.0m/min；It is described
Temperature of the molten steel before entering submersed nozzle of casting is 1535~1550 DEG C；
Covering slag is low-carbon restitutive protection slag, physicochemical property are as follows: fusion temperature is 1200 ± 20 DEG C, burn-off rate 60
± 5s, basicity are 0.85 ± 0.05, and viscosity is 3.0 ± 0.1Pas；
Using air compressor as gas source, supply gas pressure 0.11MPa, gas flow 7L/min；The covering slag is given
Material speed is 20kg/h；Covering slag is 850 DEG C in the temperature of submersed nozzle covering slag heating channel exit；
The depth that the submersed nozzle is inserted into molten steel in a crystallizer is 100mm, and covering slag heats channel outlet lower edge
It is 50mm apart from Mold liquid level.
Embodiment 2
The material of the submersed nozzle is magnesium carbonaceous；The length of the molten steel runner pipe is 850mm, diameter 35mm；
The mouth of a river wall with a thickness of 30mm；The distance between the center line in covering slag heating channel and molten steel circulation tube hub line
For 25mm；The diameter in covering slag heating channel is 7mm, length 350mm；The covering slag heats feeder connection center line
Angle with submersed nozzle vertical direction center line is 50 °, the covering slag heating channel outlet center line and immersion water
The angle of mouth vertical direction center line is 55 °；The diameter of metal hose is 20mm；
Casting molten steel is ML08Al, 325 × 280mm of Cross Section of CC Billet2, conticaster pulling rate 0.8m/min；It is described to pour cast steel
Temperature of the liquid before entering submersed nozzle is 1547~1557 DEG C；
Covering slag is low-carbon steel protecting slag, physicochemical property are as follows: fusion temperature be 1150 ± 20 DEG C, burn-off rate be 80 ±
5s, basicity are 1.10 ± 0.05, and viscosity is 0.65 ± 0.05Pas；
Using air compressor as gas source, supply gas pressure 0.14MPa, gas flow 8.5L/min；The covering slag
Delivery rate is 17kg/h；The covering slag temperature that submersed nozzle covering slag heats channel exit again is 820 DEG C；
The submersed nozzle be inserted into a crystallizer molten steel depth be 80mm, covering slag heat channel outlet lower edge away from
It is 70mm from Mold liquid level.
Embodiment 3
The material of the submersed nozzle is aluminium carbonaceous；The length of the molten steel runner pipe is 800mm, diameter 30mm；
The mouth of a river wall with a thickness of 25mm；The distance between the covering slag heating channel centerline and molten steel circulation tube hub line are
30mm；The diameter in covering slag heating channel is 8mm, length 300mm；Covering slag heating feeder connection center line with
The angle of submersed nozzle vertical direction center line is 50 °, and it is vertical with submersed nozzle that covering slag heats channel outlet center line
The angle of direction center line is 60 °；The diameter of metal hose is 30mm；
Casting molten steel is SCM435, continuous cast round billets sectionConticaster pulling rate 0.6m/min；The casting molten steel
Temperature before entering submersed nozzle is 1518~1528 DEG C；
Covering slag be medium carbon steel covering slag, physicochemical property are as follows: fusion temperature be 1100 ± 20 DEG C, burn-off rate be 70 ±
5s, basicity are 0.95 ± 0.05, and viscosity is 0.7 ± 0.05Pas；
Using air compressor as gas source, supply gas pressure 0.15MPa, gas flow 10L/min；The covering slag is given
Material speed is 25kg/h；The covering slag temperature that submersed nozzle covering slag heats channel exit again is 750 DEG C；
The submersed nozzle be inserted into a crystallizer molten steel depth be 80mm, covering slag heat channel outlet lower edge away from
It is 80mm from Mold liquid level.
In the present invention, covering slag is added in molten steel, the heat that covering slag can absorb molten steel starts to melt, and molten steel exists
It will form air gap (between steel solidified shell and crystallizer copper wall) in crystallizer after solidification shrinkage, the covering slag of fusing can enter
Drawing (demoulding) its lubricating action in air gap to slab in crystallizer.Obviously, using method and system of the invention, so that
Temperature after covering slag heating is 750~850 DEG C, and after being sprayed onto crystallizer molten steel liquid level, covering slag will not absorb molten steel liquid
The excessive heat in face can melt；Moreover, because being sprayed onto gas-solid mixture uniformly, constantly after covering slag is mixed with carrier gas
Molten steel surface avoids the molten steel liquid level locally non-uniform disadvantage of heat dissipation, improves the temperature of molten steel initial solidification, molten steel is made to exist
Crackle tendency reduces in process of setting, improves the surface quality of Continuous Casting Square, round billet.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (10)
1. a kind of method for improving Continuous Casting Square, round billet surface quality, which comprises the following steps:
Covering slag is mixed with carrier gas, obtains gas-solid mixture；After being sprayed onto molten steel liquid level after gas-solid mixture heating；Again
The solidification of molten steel is formed into Continuous Casting Square, round billet；
Heat loss through radiation of the heat source from molten steel of the gas-solid mixture heating.
2. the method according to claim 1, wherein the flow of the carrier gas is 5~15L/min.
3. method according to claim 1 or 2, which is characterized in that the charging rate of the covering slag is 15~20kg/h.
4. the method according to claim 1, wherein after the heating between gas-solid mixture and molten steel liquid level
Distance is 50~80mm.
5. it is a kind of improve Continuous Casting Square, round billet surface quality system, which is characterized in that including be sequentially communicated gas source, flowmeter,
Dispenser, submersed nozzle and crystallizer；The dispenser is connected to covering slag weighing pot；The gas source, flowmeter, dispenser
Pass through connection by metal hose between submersed nozzle；The submersed nozzle is inserted into the crystallizer；The immersion
The mouth of a river has covering slag heating system.
6. system according to claim 5, which is characterized in that the supply gas pressure of the gas source is 0.10~0.20MPa.
7. system according to claim 5, which is characterized in that the submersed nozzle includes the perforative molten steel circulation in center
The mouth of a river wall that manage, is wrapped in outside molten steel runner pipe is arranged on the outside of the mouth of a river wall between molten steel runner pipe and and molten steel
The parallel covering slag of runner pipe heats channel, the blending bunker being arranged on the outside of the mouth of a river wall；Covering slag heating channel
One end is arranged covering slag and heats feeder connection, and the other end is arranged covering slag and heats channel outlet, and covering slag heating channel enters
Mouthful and covering slag heating channel outlet it is angled with covering slag heating channel and be communicated to mouth of a river wall outside；
The covering slag heating feeder connection is connect with the blending bunker, and interface is arranged on the blending bunker；The molten steel runner pipe one
End is molten steel entrance, the other end is molten steel outlet.
8. system according to claim 7, which is characterized in that the diameter in covering slag heating channel is 5~8mm, long
Degree is 35~45mm.
9. system according to claim 7, which is characterized in that the center line of covering slag heating feeder connection with it is described
The angle of the center line of submersed nozzle vertical direction is 45~55 °；The center line of the covering slag heating channel outlet and institute
The angle for stating the center line of submersed nozzle vertical direction is 50~75 °.
10. system according to claim 5, which is characterized in that the submersed nozzle is inserted into Mold
Depth is 80~120mm.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110548840A (en) * | 2019-10-09 | 2019-12-10 | 辽宁科技大学 | device and method for adding heated solid-state covering slag into crystallizer in continuous casting process |
| CN115069992A (en) * | 2021-03-16 | 2022-09-20 | 宝山钢铁股份有限公司 | Continuous casting production method based on solid-state covering slag preheating |
| CN115354205A (en) * | 2022-08-04 | 2022-11-18 | 首钢京唐钢铁联合有限责任公司 | Preparation method of hypoperitectic steel and hypoperitectic steel |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5557361A (en) * | 1978-10-21 | 1980-04-28 | Shinagawa Refract Co Ltd | Preventing method for closing of immersion nozzle |
| JPS55114449A (en) * | 1979-02-27 | 1980-09-03 | Toshiba Ceramics Co Ltd | Gas blowing type immersion nozzle |
| JPH02235557A (en) * | 1989-03-09 | 1990-09-18 | Kurosaki Refract Co Ltd | Method for charging adding metal for continuous casting and submerged nozzle for using to this |
| JPH0313256A (en) * | 1989-06-09 | 1991-01-22 | Kawasaki Steel Corp | Method for preventing carbon pickup in continuous casting of molten steel |
| JPH04262840A (en) * | 1991-02-15 | 1992-09-18 | Tokyo Yogyo Co Ltd | Method for continuously casting molten metal |
| JP2004249315A (en) * | 2003-02-19 | 2004-09-09 | Sumitomo Metal Ind Ltd | Continuous casting method and continuous casting apparatus for molten metal |
| CN206732116U (en) * | 2017-03-10 | 2017-12-12 | 华北理工大学 | One kind side, the pre-heated submersed nozzle of round billet covering slag |
-
2019
- 2019-06-25 CN CN201910553683.6A patent/CN110181011A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5557361A (en) * | 1978-10-21 | 1980-04-28 | Shinagawa Refract Co Ltd | Preventing method for closing of immersion nozzle |
| JPS55114449A (en) * | 1979-02-27 | 1980-09-03 | Toshiba Ceramics Co Ltd | Gas blowing type immersion nozzle |
| JPH02235557A (en) * | 1989-03-09 | 1990-09-18 | Kurosaki Refract Co Ltd | Method for charging adding metal for continuous casting and submerged nozzle for using to this |
| JPH0313256A (en) * | 1989-06-09 | 1991-01-22 | Kawasaki Steel Corp | Method for preventing carbon pickup in continuous casting of molten steel |
| JPH04262840A (en) * | 1991-02-15 | 1992-09-18 | Tokyo Yogyo Co Ltd | Method for continuously casting molten metal |
| JP2004249315A (en) * | 2003-02-19 | 2004-09-09 | Sumitomo Metal Ind Ltd | Continuous casting method and continuous casting apparatus for molten metal |
| CN206732116U (en) * | 2017-03-10 | 2017-12-12 | 华北理工大学 | One kind side, the pre-heated submersed nozzle of round billet covering slag |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110548840A (en) * | 2019-10-09 | 2019-12-10 | 辽宁科技大学 | device and method for adding heated solid-state covering slag into crystallizer in continuous casting process |
| CN110548840B (en) * | 2019-10-09 | 2024-04-02 | 辽宁科技大学 | Device and method for adding heating solid-state protecting slag into crystallizer in continuous casting process |
| CN115069992A (en) * | 2021-03-16 | 2022-09-20 | 宝山钢铁股份有限公司 | Continuous casting production method based on solid-state covering slag preheating |
| CN115354205A (en) * | 2022-08-04 | 2022-11-18 | 首钢京唐钢铁联合有限责任公司 | Preparation method of hypoperitectic steel and hypoperitectic steel |
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