CN106319157A - RH refining induction heating temperature compensation device and application method thereof - Google Patents
RH refining induction heating temperature compensation device and application method thereof Download PDFInfo
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- CN106319157A CN106319157A CN201510368388.5A CN201510368388A CN106319157A CN 106319157 A CN106319157 A CN 106319157A CN 201510368388 A CN201510368388 A CN 201510368388A CN 106319157 A CN106319157 A CN 106319157A
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Abstract
The invention provides an RH refining induction heating temperature compensation device and an application method thereof. The RH refining induction heating temperature compensation device is arranged on the periphery of an RH riser pipe or an RH downtake pipe. An electromagnetic induction heating device comprises a heating coil, a power supply and a water-cooled cable. The power supply is connected with the heating coil through the water-cooled cable. The heating coil is made of a rectangular copper pipe. The cross section of the copper pipe is a hollow rectangle. Cooling water is introduced into the heating coil. A low-heat-conductivity-coefficient high-thermal-shock-resistance thermal insulating layer of 25-50 mm thickness is arranged on the inner side, close to the riser pipe or the downtake pipe, of the heating coil. Magnesia ramming materials are tamped into interturn gaps of the heating coil. By adopting the RH refining induction heating temperature compensation device, the cleanliness of molten steel can be improved. Compared with aluminum addition oxidation chemical methods, the molten steel can be made cleaner. Oxidation heat liberation of components of the molten steel is not involved. The components of the molten steel can be accurately controlled. Fluctuation of the components is prevented. The RH treatment time is shortened.
Description
Technical field
The invention belongs to external refining field, particularly relate to a kind of RH refine induction heating temperature
Compensation method.
Background technology
Along with Molten Steel Cleanliness and steel product quality requirement are improved constantly by people, RH vacuum fine
Refining technology is increasingly subject to people's attention.RH vacuum refining in early days is mainly used to remove steel
Hydrogen in water, present RH SECONDARY REFINING IN A VACUUM CHAMBER then develops into from the most single dehydrogenation functionality
Can decarburization, deoxidation, then after constantly enrich, expand to and there is oxygen blast, intensification, molten steel composition
The functions such as accurately control, pressure decarburization, desulfurization, dephosphorization and Control and Inclusion Removal with temperature.Arrive
So far, RH is developed into almost have all double refinings by simple dehydrogenation unit
The external refining equipment of function.Although RH device has good refining effect, but there is also
Some problems, as processing procedure also exists the problem of liquid steel temperature loss, cause temperature to damage
The factor lost is a lot, preheats temperature, process time, oxygen blast, aluminum including vacuum chamber and dip pipe
And alloy adds people's amount, waste gas row's temperature etc..Especially producing ultra-low-carbon steel or producing at a fairly low
When [H], [N], [O] class clean steel, the process time of RH certainly will be extended, so will result in
The loss that liquid steel temperature is bigger.And the continuous casting process modernized, the requirement to molten steel casting temperature
The harshest, qualified molten steel casting temperature is that continuous casting process is stable and to obtain qualified strand the heaviest
One of technological parameter wanted.In order to give full play to every metallurgical function, the control to temperature is extremely closed
Important, molten steel casting temperature is too low is unfavorable for inclusion floating, and the mouth of a river also can be caused to freeze, and compels
Make casting interrupt, reduce conticaster operating rate.Therefore, the liquid steel temperature of RH compensates technique more
More become one of problem of metallargist's emphasis consideration.
The widely used method with energy temperature raising function of iron and steel enterprise mainly has the most both at home and abroad
Two kinds of methods of RH-OB and RH-KTB.
Within 1972, Shi Lan factory of Nippon Steel develops RH-OB inlet side oxygen blast technology, and this technology adds
Speed decarburizing reaction, effect is very notable, have also been obtained extensively application in China Ge great steel mill.
In processing procedure, in order to reduce the temperature drop of molten steel or molten steel is carried out temperature raising can add in molten steel
Entering Al, then carry out oxygen blast temperature raising and compensate temperature loss, whole temperature losses of the process is only 20 DEG C,
It is half during not oxygen blast carbon drop, it is possible to extend RH further and process the time.But the method
Maximum deficiency be add Al temperature raising after, field trash is the most, and size is bigger, it is necessary to carry out
The gentliest process (circulation time is more than 10min) could remove due to the large-scale folder produced that heats up
Foreign material.So to high-quality steel, RH-OB hyperthermic treatment should be cautious use of.It addition, the spray of side rifle
The mouth life-span is low, needs often to change, and making maintenance cost improve also is one of the deficiency of RH-OB.
1986, Kawasaki, Japan iron company, for meeting auto industry, plate quality is proposed
Requirement, make great efforts to reduce the carbon content in steel, develop the RH-KTB technology of top blowing oxygen.
When this technology temperature raising is by oxygen decarburization, the CO gas second-time burning of generation, release heat,
Compensate for the temperature loss of RH processing procedure.The advantage of this method is to need not additionally add thermal source
(such as aluminum, silicon etc.), pollute low to molten steel, the beneficially smelting of clean steel, low cost.The method
Maximum deficiency be highly advantageous for processing some ultra-low-carbon steels, but some carbon contents are compared
To gas content, height, requires that stricter steel grade is the most relatively difficult simultaneously.
1992, Guang Dian factory of Nippon Steel developed RH-MFB multifunctional nozzle vacuum chamber top blast
Oxygen technology, is compensated the fuel gas buring mainly sprayed into by nozzle and realizes liquid steel temperature
, reach to heat the purpose of molten steel.This technology can also be with RH-OB equally by putting into simultaneously
Aluminum combustion heating heats to realize temperature-compensating.
As a whole, in current RH refining process or throw Al, Si combustion heat release,
Or utilize decarburization produce CO and spray into coal gas combustion heat release chemical oxidation method come
Realize temperature-compensating.Weak point is exactly during temperature raising, adds field trash in molten steel and contains
Amount, needs increase the gentliest to process operation, it is common that bright for processing ultra-low-carbon steel intensification advantage
Aobvious, but the temperature raising for medium and high carbon steel processes it is possible to cause [C] composition to fluctuate, and is unfavorable for composition
Control.
In RH vacuum refining process, the compensation to temperature controls extremely important, because at evacuation
During degassing and decarburization, major part heat can be taken away by the argon being blown into, meanwhile steel
Water continuous circulation in vacuum chamber and ladle also accelerates the loss of heat, and additionally dip pipe is with true
The best loss that also can aggravate temperature of baking of empty room.Various factors superposition will result in process temperature
Fall is very big, makes liquid steel temperature reduce, and not only resulting in vacuum chamber steel bonding affects other heat steel
Water constituent controls, and the cast temperature simultaneously also affecting this heat controls, and molten steel casting temperature is too low
It is unfavorable for inclusion floating, makes the raising difficulty of molten steel cleanness strengthen, it could even be possible to cause
The mouth of a river is freezed, and forces the production accident that casting is interrupted.To this end, existing RH refining equipment is all
It is furnished with and throws aluminum oxygen blast combustion heat release or spray into the temperature benefit of coal gas and second-time burning heat release
The function repaid.From the point of view of the development trend of current clean steel, improve constantly molten steel cleanness and become
Point being precisely controlled is inevitable development trend in the future.But current existing RH refinery practice is right
In the chemical method that molten steel temperature compensates, raising and composition to molten steel cleanness are precisely controlled
System has certain adverse effect.
Come real to this end, the present invention proposes a kind of physical method based on electromagnetic inductive heating principle
The method of existing RH temperature raising, and then improve the deficiency of temperature raising in chemical method, thus reach refine
Temperature raising effect, the composition caused during eliminating temperature raising fluctuation and the field trash brought, for molten steel
The raising of cleanliness factor creates conditions.
Summary of the invention
It is an object of the invention to overcome the problems referred to above and deficiency to provide a kind of RH refining process
The method of temperature-compensating, thoroughly eliminates composition fluctuation and band that in current technical process, temperature raising causes
The field trash come, the raising for molten steel cleanness creates conditions.
The object of the present invention is achieved like this:
By filling at the tedge of RH dip pipe and the electromagnetic induction heating of down-comer peripheral disposition
Put to carry out sensing heating to internal molten steel and realize the temperature-compensating to molten steel.
A kind of RH refine induction heating temperature compensation device, it is characterised in that RH refine sense
Heating-up temperature compensation device is answered to be arranged on RH tedge or the tedge of down-comer and decline
The periphery of pipe, electromagnetic induction heater includes heating coil, power supply, water-cooled cable,
Power supply connects heating coil by water-cooled cable, and described heating coil is rectangle copper pipe, copper
The cross section hollow rectangle of pipe is 30mm × 20mm, rectangle copper pipe wall thickness at 3mm～
5mm；Copper content be more than 99.95%, described heating coil height L be 300mm～
600mm, the number of turn is 10 circles～20 circles, internal coil diameter D1 and tedge or down-comer
The ratio of internal diameter D2 be 1.25～1.5, heating coil inside logical cooling water；In heating
Press close to tedge inside coil or down-comer side arranges the thick low heat conduction of 25mm～50mm
Coefficient high-heat resistance shock resistant thermal insulation layer, for the magnesia ramming in gap of described heating coil turn-to-turn
Material tamps.
Described low thermal conductivity high-heat resistance shock resistant thermal insulation layer is Vermiculitum material thermal insulation layer.
A kind of using method of RH refine induction heating temperature compensation device,
Step one: electromagnetic heating coil is arranged on the periphery of tedge and down-comer, institute
Distance H stating heating coil distance from top vacuum chamber bottom enclosure is 90-110mm, adds
Heat coil makes the molten steel in tedge and down-comer passage be in heating coil when installing
Center, and power supply is connected with water-cooled cable；
Step 2: in vacuum chamber and tedge or down-comer baking process, open heating
Coil coolant valve, makes coil be in the state of cooling, and is adjusted to by the flow velocity of cooling water
1m/s～3m/s；
Step 3: after vacuum chamber and tedge, down-comer baking temperature reach requirement,
Refining treatment is carried out in tedge and down-comer are inserted into the molten steel of ladle, first will cooling
The flow velocity of water is adjusted to 2m/s～4m/s scope, be then turned on and off switch to tedge with
Molten steel in down-comer carry out sensing heating, afterwards by cooling water flow velocity be adjusted to 4m/s～
6m/s, the inflow temperature 30 DEG C～35 DEG C of heating coil cooling water, power can root
It is adjusted according to the temperature of the molten steel that enters the station and the temperature requirement of upper machine, the power value of power supply
Scope is at 50kW～100kW；Heating coil supply frequency is pressedCount
Calculating, in formula, ρ is the resistivity of molten steel, and f is 1000Hz～2000Hz；
Step 4: after RH refining treatment is complete,
If the pending ladle of next tank puts in place, by coil heats power-off, forbid
Closing cooling water, the flow velocity of cooling water is maintained at 4m/s～6m/s scope, reenters
The operation of step 3；
If processing last tank steel watered time, pending after, first power supply is closed
Close 60～100 minutes, afterwards cooling water is adjusted to 1m/s～3m/s scope, 100 points
After clock, cooling water is adjusted to 0.5m/s～1m/s scope, treats the temperature of tedge and down-comer
After dropping to room temperature, can be by the valve closing of cooling water；
When watering secondary RH refining treatment if carried out next, carry out accordingly by step 2
Technological operation.
The beneficial effects of the present invention is:
(1) Tapping Temperature of Bof 5 DEG C～10 DEG C, carrying for converter lining life can be reduced
High and integrated cost reduction creates conditions.
(2) cleanliness factor of molten steel can be improved further, due to temperature-compensating employing
It is that the physical method of electromagnetic induction heating relatively adds the chemical method of aluminum oxidation and can make molten steel
Cleaner.
(3) when temperature-compensating, it is not related to utilize the oxidation heat liberation of molten steel component, energy
Enough it is precisely controlled molten steel component, prevents composition to fluctuate.
(4) temperature compensation of electromagnetic induction heating, can be from the beginning of RH processes
Carry out to terminating always, relatively add the chemical method of aluminum oxidation and can remove molten steel from when gently processing
Between, RH can be shortened and process the time, make whole rhythm of production compacter.
(5) due in electromagnetic induction heating temperature compensation procedure easy to control flexibly, energy
Enough molten steel for upper machine provide optimal temperature, the beneficially raising of slab quality.
Accompanying drawing explanation
Fig. 1 is RH refine induction heating temperature compensation device operating diagram.
Heating coil structure schematic diagram of the present invention in Fig. 2.
1-vacuum chamber in figure, 2-down-comer, 3-heating coil, 4-tedge, 5-water-cooled cable,
6-power supply, 7-turn-to-turn filler, 8-rectangle copper pipe, 9-thermal insulation layer, the heated molten steel of 10-, 11-
Impregnated tube liner.
Detailed description of the invention
Embodiment 1:
As it can be seen, a kind of RH refine induction heating temperature compensation device, RH refine senses
Heating-up temperature compensation device is arranged on RH tedge 4 and the periphery of down-comer 2, electromagnetism sense
Answering heater to include heating coil 3, power supply 6, water-cooled cable 5, power supply 6 passes through
Water-cooled cable 5 connects heating coil 3, and described heating coil 3 is the rectangle copper pipe of hollow
8, the cross section hollow rectangle of copper pipe is 30mm × 20mm, and rectangle copper pipe 8 wall thickness exists
3.5mm；Copper content is more than 99.95%, and described heating coil 3 height L is 350mm,
The number of turn is 12 circles, heating coil 3 internal diameter D1 and tedge 4 or down-comer 2 interior
The ratio of footpath D2 is 1.26, the internal logical cooling water of heating coil 3；At heating coil 3
Tedge 4 is pressed close in inner side or down-comer 2 side arranges 30mm thickness low thermal conductivity height and resists
Thermal shock resistance thermal insulation layer, the gap magnesian ramming mass for described heating coil 3 turn-to-turn is filled out
Real.
Described low thermal conductivity high-heat resistance shock resistant thermal insulation layer is Vermiculitum material thermal insulation layer.
A kind of using method of RH refine induction heating temperature compensation device,
Step one: electromagnetic heating coil 3 is arranged on outside tedge 4 and down-comer 2
Enclosing, distance H of described heating coil 3 distance from top vacuum chamber 1 bottom enclosure is
95mm, heating coil 3 makes the molten steel in tedge 4 and down-comer 2 passage when installing
It is in the center of heating coil 3, and power supply 6 is connected with water-cooled cable 5；
Step 2: in vacuum chamber 1 and tedge 4, down-comer 2 baking process, beat
Open heating coil 3 coolant valve, make heating coil 3 be in the state of cooling, and will cooling
The flow velocity of water is adjusted to 1.5m/s；
Step 3: treat that vacuum chamber 1 and tedge 4 and down-comer 2 baking temperature reach to want
After asking, in tedge 4 and down-comer 2 are inserted into the molten steel 10 of ladle, carry out refine
Process.When the molten steel temperature that enters the station is less than RH treatment temperature lower limit 5 DEG C, first will cooling
The flow velocity of water is adjusted to 3.2m/s scope, be then turned on power supply 6 switch to tedge 4 with
Molten steel 10 in down-comer 2 carries out sensing heating, power is adjusted to 60kW simultaneously
Carry out sensing heating, after 5 minutes, carry out thermometric, if temperature is to meet the requirement of RH
After, power is adjusted to 50kW, cooling water flow velocity is adjusted to 4.1m/s to be carried out at insulation
Reason；If temperature is also not reaching to the requirement of RH, power can be adjusted to 70kW cooling
Water flow velocity is adjusted to 4.8m/s and heats, until after meeting RH treatment temperature, by merit
Rate is adjusted to 55kW cooling water flow velocity and is adjusted to 4.1m/s and carries out process isothermal holding, this
Cross range request heater wire circle 3 and cool down the inflow temperature 33 DEG C of water, heating coil power frequency
Rate is pressedCalculating, in formula, ρ is the resistivity of molten steel, the desirable 1000Hz of f
Until after RH process terminates, closing power supply；
Step 4: after RH refining treatment is complete, if the pending ladle of next tank puts in place,
Being closed by heating coil 3 heating power supply, Do not switch off cooling water, the flow velocity of cooling water is protected
Hold in 4.5m/s scope, reenter the operation of step 3；Water time if processing
Last tank steel, pending after, first power supply 6 is closed 70 minutes, afterwards will
Cooling water is adjusted to 1.5m/s, after 100 minutes, cooling water is adjusted to 0.5m/s, treats tedge
After 4 drop to room temperature with the temperature of down-comer 2, can the valve closing of cooling water；If
When carrying out next RH refining treatment watered time, carry out corresponding technological operation by step 2.
Carry out temperature-compensating by the method, can by technology require 1650 DEG C turn
Stove tapping temperature is reduced to 1645 DEG C of tappings, it is possible to reduce by 5 DEG C of tapping temperatures, beneficially stoves
The raising in age, and the RH process time that can shorten 2 minutes, improve refining efficiency.
Embodiment 2:
As it can be seen, a kind of RH refine induction heating temperature compensation device, RH refine sensing adds
Hot temperature compensation means is arranged on RH tedge 4 and the periphery of down-comer 2, electromagnetism sense
Answering heater to include heating coil 3, power supply 6, water-cooled cable 5, power supply 6 passes through
Water-cooled cable 5 connects heating coil 3, and described heating coil 3 is the rectangle copper pipe of hollow
8, the cross section hollow rectangle of copper pipe is 30mm × 20mm, and rectangle copper pipe 8 wall thickness exists
4.5mm；Copper content is more than 99.95%, and described heating coil 3 height L is 580mm,
The number of turn is 15 circles, heating coil 3 internal diameter D1 and tedge 4 or down-comer 2 interior
The ratio of footpath D2 is 1.4, the internal logical cooling water of heating coil 3；At heating coil 3
Tedge 4 is pressed close in inner side or down-comer 2 side arranges 40mm thickness low thermal conductivity height and resists
Thermal shock resistance thermal insulation layer, the gap magnesian ramming mass for described heating coil 3 turn-to-turn is filled out
Real.
Described low thermal conductivity high-heat resistance shock resistant thermal insulation layer is Vermiculitum material thermal insulation layer.
A kind of using method of RH refine induction heating temperature compensation device,
Step one: electromagnetic heating coil 3 is arranged on outside tedge 4 and down-comer 2
Enclosing, distance H of described heating coil 3 distance from top vacuum chamber 1 bottom enclosure is
105mm, heating coil 3 makes the molten steel in tedge 4 or down-comer 2 passage when installing
It is in the center of heating coil 3, and power supply 6 is connected with water-cooled cable 5；
Step 2: in vacuum chamber 1 and tedge 4, down-comer 2 baking process, beat
Open heating coil 3 coolant valve, make heating coil 3 be in the state of cooling, and will cooling
The flow velocity of water is adjusted to 1.8m/s；
Step 3: treat that vacuum chamber 1 and tedge 4 and down-comer 2 baking temperature reach to want
After asking, in tedge 4 and down-comer 2 are inserted into the molten steel 10 of ladle, carry out refine
Process.When the molten steel temperature that enters the station is less than RH treatment temperature lower limit 5 DEG C, first will cooling
The flow velocity of water is adjusted to 3.5m/s scope, be then turned on power supply 6 switch to tedge 4 with
Molten steel 10 in down-comer 2 carries out sensing heating, power is adjusted to 75kW simultaneously
Carry out sensing heating, after 8 minutes, carry out thermometric, if temperature is to meet the requirement of RH
After, power is adjusted to 50kW, cooling water flow velocity is adjusted to 4m/s and carries out isothermal holding；
If temperature is also not reaching to the requirement of RH, power can be adjusted to 80kW and cool down current
Speed is adjusted to 5.5m/s and heats, until after meeting RH treatment temperature, being adjusted by power
Whole it be adjusted to 4.5m/s carry out process isothermal holding to 55kW cooling water flow velocity, this process
Requiring that heating coil 3 cools down the inflow temperature 30 DEG C of water, heating coil supply frequency is pressed Calculating, in formula, ρ is the resistivity of molten steel, and the desirable 1200Hz of f is straight
After terminating to RH process, close power supply；
Step 4: after RH refining treatment is complete,
If the pending ladle of next tank puts in place, heating coil 3 heating power supply is closed
Closing, Do not switch off cooling water, the flow velocity of cooling water is maintained at 4.6m/s scope, again
Enter the operation of step 3；Last secondary tank steel is watered if processing, pending complete
After, first power supply 6 is closed 80 minutes, afterwards cooling water is adjusted to 1.6m/s, 100
After minute, cooling water is adjusted to 0.8m/s, treats that tedge 4 drops to the temperature of down-comer 2
After room temperature, can be by the valve closing of cooling water；Secondary RH refine is watered if carried out next
During process, carry out corresponding technological operation by step 2.
Carry out temperature-compensating by the method, can by technology require 1660 DEG C turn
Stove tapping temperature is reduced to 1650 DEG C of tappings, reduces the Tapping Temperature of Bof of 10 DEG C beneficially
The raising in furnace life and the raising of the recovery rate of alloy, and the RH process of 5 minutes can be shortened
Time, improve refining efficiency.
Claims (3)
1. a RH refine induction heating temperature compensation device, it is characterised in that RH refine
Induction heating temperature compensation device is arranged on outside RH tedge (4) and down-comer (2)
Enclosing, electromagnetic induction heater includes heating coil (3), power supply (6), water-cooled cable
(5), power supply (6) by water-cooled cable (5) connect heating coil (3), described in add
Heat coil (3) is the rectangle copper pipe (8) of hollow, and the cross section of copper pipe is hollow 30mm
The rectangle of × 20mm, rectangle copper pipe (8) wall thickness is at 3mm～5mm；Copper content is big
In 99.95%, described heating coil (3) highly L is 300mm～600mm, circle
Number is 10 circles～20 circles, heating coil (3) internal diameter D1 and tedge (4) or under
The ratio of the internal diameter D2 of fall pipe (2) is 1.25～1.5, and heating coil (2) is internal logical
Cooling water；Tedge (4) and down-comer (2) is pressed close in heating coil (2) inner side
Side arranges 25mm～50mm thickness low thermal conductivity high-heat resistance shock resistant thermal insulation layer (9),
Gap turn-to-turn filler (7) of described heating coil (3) turn-to-turn is tamped.
The most according to claim 1, RH refine induction heating temperature compensation device, it is special
Levying and be, described low thermal conductivity high-heat resistance shock resistant thermal insulation layer is Vermiculitum material thermal insulation layer,
Described turn-to-turn filler is magnesian ramming mass.
3. a RH refine induction heating temperature compensation device as claimed in claim 1 or 2
Using method, it is characterised in that
Step one: electromagnetic heating coil (3) is arranged on tedge (4) and down-comer
(2) periphery, outside described heating coil (3) distance from top vacuum chamber (1) bottom
Distance H of shell is 90mm-110mm, and heating coil (3) makes tedge (4) when installing
With the centre bit that the molten steel (10) in down-comer (2) passage is in heating coil (3)
Put, and power supply (6) is connected with water-cooled cable (5)；
Step 2: in vacuum chamber (1) and tedge (4) and down-comer (2) baking
During, open heating coil (3) coolant valve, make coil be in the state of cooling,
And the flow velocity of cooling water is adjusted to 1m/s～3m/s；
Step 3: treat that vacuum chamber (1) and tedge (4) toast with down-comer (2)
After temperature reaches requirement, tedge (4) and down-comer (2) are inserted into the steel of ladle
Carry out refining treatment in liquid (10), first the flow velocity of cooling water is adjusted to 2m/s～4m/s
Scope, is then turned on power supply (6) switch interior with down-comer (2) to tedge (4)
Molten steel (10) carry out sensing heating, afterwards by cooling water flow velocity be adjusted to 4m/s～
6m/s, the inflow temperature 30 DEG C～35 DEG C of heating coil (3) cooling water, power
Can be adjusted according to the temperature requirement of the temperature of the molten steel that enters the station and upper machine, the power of power supply
Span is at 50kW～100kW；Heating coil (3) supply frequency presses f ＞Calculating, in formula, ρ is the resistivity of molten steel, f be 1000Hz～
2000Hz；
Step 4: after RH refining treatment is complete, if the pending ladle of next tank puts in place,
Being closed by coil heats power supply (6), Do not switch off cooling water, the flow velocity of cooling water is protected
Hold in 4m/s～6m/s scope, reenter the operation of step 3；Water if processing
Last secondary tank steel, pending after, first by power supply (6) close 60～100
Minute, afterwards cooling water is adjusted to 1m/s～3m/s scope, will cooling after 100 minutes
Water is adjusted to 0.5m/s～1m/s scope, treats the temperature of tedge (4) and down-comer (2)
After dropping to room temperature, can be by the valve closing of cooling water；Secondary RH is watered if carried out next
During refining treatment, carry out corresponding technological operation by step 2.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111172355A (en) * | 2020-01-10 | 2020-05-19 | 中冶赛迪工程技术股份有限公司 | Induction heating single-nozzle vacuum refining furnace and clean steel smelting process |
| CN114891958A (en) * | 2022-05-31 | 2022-08-12 | 东北大学 | Multifunctional induction heating RH refining device and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106319157B (en) | 2018-08-03 |
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