CN108774662A - A kind of induction furnace and RH-OB duplex techniques - Google Patents
A kind of induction furnace and RH-OB duplex techniques Download PDFInfo
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- CN108774662A CN108774662A CN201810665887.4A CN201810665887A CN108774662A CN 108774662 A CN108774662 A CN 108774662A CN 201810665887 A CN201810665887 A CN 201810665887A CN 108774662 A CN108774662 A CN 108774662A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/52—Manufacture of steel in electric furnaces
- C21C5/5241—Manufacture of steel in electric furnaces in an inductively heated furnace
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
- C21C7/0645—Agents used for dephosphorising or desulfurising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/068—Decarburising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C2007/0093—Duplex process; Two stage processes
Abstract
When producing the high-alloy steel of steel-casting and electroslag, a kind of induction furnace of the application offer and RH-OB duplex techniques.I.e.：Steel scrap is heated up by using induction furnace and is melted, then decline RH-OB vacuum facilities on induction furnace, the molten steel in induction furnace is carried out in RH-OB vacuum chambers decarburization, slag making, dephosphorization, desulfurization, deoxidation, degassing, alloying external refining duplex technical process；Make full use of induction furnace fast melting, the advantage that temperature control is accurate, yield of alloy and recovery rate of iron are high, it is combined again with RH-OB vacuum flush systems, after realizing that the sensed stove of steel scrap just refines, the completely new smelting process flow of decarburization, slag making, dephosphorization, desulfurization, deoxidation, degassing and alloying is carried out online.When producing the high-alloy steel of excellent special steel and steel-casting, electroslag, the technique expands induction furnace material range, and it is easy to operate, input is smaller, operating cost is relatively low, and dust removing effects are good, is a kind of environmentally friendly, energy-efficient production technology, it eliminates RH-OB stoves to work independently required workshop and the investment of personnel, greatly reduces production cost.
Description
Technical field
The present invention relates to field of metallurgy, one used in the high-alloy steel for producing steel-casting, electroslag and excellent special steel
Kind induction furnace and RH-OB duplex techniques.
Background technology
Induction furnace is to metal material efficiency of heating surface highest, fastest, the induction heating equipment of low-loss and energy-saving environment-friendly type.
Its principle is：Material generates vortex to reach heating and fusing under the alternating electromagnetism field action of induction furnace, inside material
Purpose.Under the stirring action of this alternating magnetic field, the ingredient of steel smelting and temperature are more uniform in stove, and smelting temperature is up to 1650
℃。
At present since domestic steel scrap cannot accomplish sophisticated category according to steel grade and ingredient, simultaneously as induction furnace does not have
Oxidative function, so that steel its carbon of induction furnace production, phosphorus cannot be guaranteed to reach country to gas content or industry is related
Therefore standard significantly limits the development of induction furnace.
RH system equipments are a kind of steel secondary refining technological equipments for producing excellent special steel.Entire molten steel metallurgical reaction
It is to be carried out in the vacuum tank that block has refractory lining.The lower part of vacuum tank is two dip pipes with refractory lining, and top is equipped with heat
Bend pipe.Pumped gas is discharged to through gas cooler to vacuum pump system outside workshop by hot-bending pipe.Its principle is：Before steel treatment,
First dip pipe is immersed in pending ladle molten steel.When vacuum tank vacuumizes, the atmospheric pressure of molten steel surface forces molten steel
It flows into vacuum tank from dip pipe and (molten steel can be made to rise 1.48m height in vacuum tank when about 0.67mbar).Connect with vacuum tank
Two logical dip pipes, one is tedge, and one is down-comer.It is opposite not have since tedge is constantly blown into argon gas to molten steel
There is the down-comer of Argon to produce a higher static pressure difference, molten steel is made to be entered into and through under the flow direction of vacuum tank lower part from tedge
Drop pipe, so constantly recycles repeatedly.Under vacuum conditions, the gases such as argon gas, hydrogen, the carbon monoxide in vacuum tank molten steel are flowed through
It is pumped in molten steel cyclic process.Meanwhile also carrying out a series of metallurgical reaction, such as carbon oxygen into the molten steel in vacuum tank
Reaction etc.;Such circulating degasification refining makes molten steel be purified.RH-OB methods (RH-oxygen blowwing) refer to the molten steel in RH
One oxygen-blowing gun, the molten steel surface oxygen blast to vacuum chamber, with removing are installed on the vacuum chamber side wall of vacuum circulation degassing method device
The method of carbon and phosphorus in molten steel.This method can make the carbon in the molten steel handled by RH-OB reach 10-4The level of % is production
Mild steel and ultra-low-carbon steel, the especially important means of some ultra-low carbon steel kinds.The molten steel advantage handled through RH-OB is apparent:It closes
Auri is not originally reacted with clinker, and alloy is directly added among molten steel, and recovery rate is high;Molten steel energy Quick uniform mixes;Alloying component
Can be controlled in it is narrow within the scope of;Gas content is low, and field trash is few, and Molten Steel Cleanliness is high;Chemistry can also be carried out with top gun
Heating and composition adjustment provide the molten steel that good fluidity, degree of purity are high, meet cast temperature for conticaster, ingot casting or casting.
The main equipment of excellent special steel production is electric arc furnaces and converter both at home and abroad at present, above electric arc furnaces and converter body
There is the various equipment such as electrode, scrap steel preheating or oxygen rifle, therefore, the layout of RH-OB and first furnace is all to arrange offline.Induction furnace stove
There is no various equipment, domestic and international RH-OB induction furnace and RH-OB duplex techniques not yet occur on body.
The present invention and traditional processing technology essence difference lies in：
Induction furnace is only the container of melting waste steel, isolated operation, traditional induction furnace steel-smelting production technology stream in traditional technique
There are two types of journeys：1. induction furnace smelting → LF refining → ingot casting or casting；2. induction furnace smelting → ingot casting or casting.Two kinds of flows are equal
Do not have the functions such as decarburization, dephosphorization, degassing.Though traditional RH-OB has decarburization, dephosphorization, degassing, desulfurizing function, and electric furnace
（Or converter）, LF refining furnace matching, the technological process of production is：Electric arc furnaces → LF refining furnace → RH-OB（Or VD）→ continuous casting or
Molding, converter → LF refining furnace → RH-OB（Or VD）→ continuous casting or molding；RH-OB is in independent place in two kinds of flows
On with ladle be contain molten steel vessel offline individually produce.
The present invention is that RH-OB carrying vehicles are arranged in the top of induction furnace, and RH-OB is mounted in carrying vehicle, when induction furnace will
Scrap melting and when being warming up to 1550~1620 DEG C, starts RH-OB carrying vehicles, RH-OB devices is moved to above induction furnace
" being vacuum-treated station " is then the container for containing molten steel with induction furnace, and molten steel carries out vacuum oxygen and slag refining in RH-OB
（RH-OB is refined）, while induction furnace can also electrified regulation heating.That is the difference of the present invention and traditional processing technology essence
It is：The present invention not only applies RH-OB in the production procedure that induction furnace is smelted, but also makes RH-OB and induction furnace at one
Station is completed to smelt, and forms induction furnace+RH-OB duplexs, smelts excellent special steel technological process and is：Induction furnace+RH-OB → LF refining
Stove → continuous casting or molding or casting.Its main feature is that by induction furnace have it is high to the metal material efficiency of heating surface, speed is fast, metal is received
The advantages such as yield is high, at low cost, low-loss and energy-saving is environmentally friendly with RH-OB there is decarburization, dephosphorization, degassing, desulfurizing function and alloy to receive
Rate is high, molten steel composition is uniform, gas content is low, and field trash is few, and the advantages such as Molten Steel Cleanliness height are integrated.Two equipments are taken
Duplex can not only ensure that recovery rate of iron is high, at low cost, low-loss and energy-saving is environmentally friendly, have decarburization, dephosphorization, degassing, desulfurization work(
It can, it can also be ensured that product composition is uniform, gas content is low, and field trash is few, the high feature of Molten Steel Cleanliness, therefore, with tradition
Production technology is compared, and the present invention has very strong competitive advantage and assurance ability.
Invention content
The technical issues of solution：1. the application, which mainly solves induction furnace, does not have decarburization, dephosphorization, degassing function and Cleanliness of Molten Steel
It is not high, mild steel and ultra-low-carbon steel problem and the excellent special steel problem of high-quality cannot be produced；2. solving traditional electric steel, converter steel
Recovery rate of iron is low, long flow path, investment is big and produces mild steel and the relatively difficult problem of ultra-low-carbon steel；3. solving iron plane flower
The big problem of equal thin materials society storage capacity, is conducive to scrap resources and efficiently uses.
Technical solution：
A kind of induction furnace and RH duplex techniques, step are：
The first step：Steel scrap is melted in induction furnace, when molten steel amount reaches the 90~98% of furnace capacity in stove, induction furnace stops
Only plus steel scrap, it then heats up, when temperature reaches 1550~1620 DEG C, tilt induction stove carries out deslagging.It will sense after deslagging
It answers stove to be restored to charging station, starts RH-OB carrying vehicles, RH-OB devices are moved to above induction furnace and " are vacuum-treated work
Position " is then turned on and declines RH-OB devices and open argon gas driving gas, the dip pipe of RH-OB is made to invade pending induction furnace
Liquid steel level certain depth.
Second step：Level-one, two level, three-level, level Four, Pyatyi vacuum pump is respectively started to vacuumize, when vacuum tank vacuumizes,
Pressure difference in the atmospheric pressure and vacuum tank of molten steel surface forces molten steel towards flowing in dip pipe.Two dippings being connected to vacuum tank
Pipe, one is tedge, and one is down-comer.Since tedge is constantly blown into argon gas to molten steel, it is blown into that when gases are heated, they expand,
To drive molten steel constantly to rise, the gases such as argon gas, hydrogen, nitrogen, the carbon monoxide in vacuum tank molten steel are flowed through in vacuum shape
It is pumped under state.The molten steel of degassing constantly recycles repeatedly since proportion increase is flowed into through down-comer in induction furnace again, with regard to this.
Third walks：RH-OB vacuum chambers reach certain vacuum degree, and molten steel face reach a certain height, and decline oxygen rifle, to RH-
The molten steel of OB vacuum chambers is blown into oxygen, by feeding device in RH-OB vacuum chambers to molten steel be added Dephosphorising agent or desulfurizing agent or
Alloy（To make high basicity slag in RH-OB vacuum chambers）, to molten steel carry out vacuum decarburization, dephosphorization, desulfurization, dehydrogenation, denitrogenation and
Alloying.Molten steel component and gas content can be determined by being analyzed in induction furnace furnace inner sampling.
4th step：When carbon content, phosphorus content or the sulfur content in steel blow to process stipulation range.Vacuum breaker makes steel
Water and basic slag enter induction furnace, promote RH-OB and start RH-OB carrying vehicles and are moved into " parking station ".Then, it tilts
Induction furnace carries out deslagging and skims.Deslagging and induction furnace is restored to charging station after skimming.
5th step：Induction furnace is powered and adds the return material or alloy of smelted steel grade, until molten steel amount reaches requirements of plan
Molten steel amount, be then warming up to tapping temperature.Induction furnace is tapped to refining ladle after temperature component qualification.It then will with driving
Refining ladle is hung furnaceman LF position and is refined to molten steel.
Average oxygen consumption≤30m3/ t steel, slag charge consumption≤20kg/t steel, steel technology≤1040kg/t steel, do not have
Consumption of electrode.With electric furnace or converter ratio, steel scrap price is low, the similar steel oxygen consumption of production reduces 15m3More than/t steel, slag charge disappears
Consumption reduces 10kg/t steel or more, and steel technology reduces 10kg/t or more, and alloy recovery is high；With electric furnace than consumption of electrode be 0.
It saved resource, reduced waste sludge discharge, ton steel cost reduces by 200 yuan or more.
Description of the drawings
Fig. 1 is the process flow chart of the application RH-OB duplex techniques.
Fig. 2 is the structural schematic diagram of the application induction furnace.
Advantageous effect：Original two individual smelting procedures are carried out duplex by the application.
1, in terms of cost：(the electric arc furnaces → LF refining furnace → RH-OB compared with traditional full steel scrap electric furnace route（Or VD）→
Continuous casting or molding), steel technology reduces 70kg/t steel or more（Electric furnace steel technology presses 1110kg/t steel, and the present invention presses
1040 kg/t steel）, slag charge, which consumes, reduces 30kg/t steel or more（50kg/t steel, RH-OB of the present invention are pressed in the consumption of electric steel slag charge
Dephosphorization presses 20 kg/t steel）, consumption of electrode reduces 2.5kg/t steel or more（Electric steel consumption of electrode presses 2.5kg/t steel, the present invention
For 0 kg/t steel）, power consumption reduces 50kg/t steel or more（Furnace steel consumption presses 650 degree/t steel, and induction furnace electricity consumption of the present invention is
530 degree/t steel, RH-OB electricity consumptions 70 degree/t steel amount to 600 degree/t steel）, oxygen, which consumes, reduces 20kg/t steel or more（Electric steel
50m is pressed in oxygen consumption3/ t steel, RH-OB oxygen blast of the present invention are 30 m3/ t steel）, alloy recovery height（The electric furnace smelted using oxygen blast
It is about 10~20%, Mo and the Ni rate of recovery is about 95% or more that the general Cr rate of recovery of steel, which is about 10~20%, the Mn rate of recovery, the present invention
Using decarburization pattern, it is about 80% or more, Mo and the Ni rate of recovery is about 100% that the Cr rate of recovery, which is about 90% or more, the Mn rate of recovery, such as
Fruit use dephosphorization pattern, the Cr rate of recovery be about 20~30%, the Mn rate of recovery be about 10~20%, Mo and the Ni rate of recovery be about 98% with
On）.By taking 42CrMo as an example, traditional full steel scrap electric furnace route produces 42CrMo steel billets about 4200 yuan/t of cost, flow of the present invention
(induction furnace+RH-OB → LF refining furnace → continuous casting or molding or casting) produces 42CrMo steel billets about 3600 yuan/t of cost, therefore imitates
It is beneficial apparent.
(the converter → LF refining furnace → RH-OB compared with traditional bof process（Or VD）→ continuous casting or molding), iron and steel stock
Consumption reduces 35kg/t steel or more（Converter steel technology presses 1075kg/t steel, and the present invention presses 1040 kg/t steel）, iron and steel stock valence
The low about 600 yuan/t of lattice（Coverter pig molten iron price presses 2000 yuan/t, and steel scrap price presses 2200 yuan/t, and induction furnace of the present invention is mainly used
Iron plane is spent, and price presses 1400 yuan/t）, slag charge, which consumes, reduces 35kg/t steel or more（65kg/t steel is pressed in the consumption of converter steel slag charge, this
It invents RH-OB dephosphorizations and presses 30 kg/t steel）, power consumption increases 600 degree/t steel（Converter steel power consumption presses 0 degree/t steel, present invention induction
Stove electricity consumption is 530 degree/t steel, and RH-OB electricity consumptions 70 degree/t steel amounts to 600 degree/t steel）, oxygen, which consumes, reduces 30kg/t steel or more
（55m is pressed in the consumption of converter steel oxygen3/ t steel, RH-OB oxygen blast of the present invention are 30 m3/ t steel）, alloy recovery height（Using oxygen blast smelting
It is about 5~10%, Mo and the Ni rate of recovery is about 90% or more, this hair that the general Cr rate of recovery of converter steel of refining, which is about 5%, the Mn rate of recovery,
Bright to use decarburization pattern, it is about 80% or more, Mo and the Ni rate of recovery is about 100% that the Cr rate of recovery, which is about 90% or more, the Mn rate of recovery,
If using dephosphorization pattern, it is about 10~20%, Mo and the Ni rate of recovery is about 98% that the Cr rate of recovery, which is about 20~30%, the Mn rate of recovery,
More than）By taking 42CrMo as an example, traditional bof process produces about 3800 yuan/t of 42CrMo steel billets cost, flow life of the present invention
42CrMo steel billets about 3600 yuan/t of cost is produced, therefore benefit is apparent.
2. environmentally friendly aspect：General China converter producing ton steel CO2 discharges are 2.2 tons or so, and electric arc furnaces produces ton steel CO2 rows
It is high-volume 0.8 ton or so.The present invention is due to the use of full scrap smelting, and carbon content is low in steel scrap, while RH-OB under vacuum
Directly to oxygen blowing in molten steel, oxygen utilization rate is high, and ton steel CO2 discharge capacitys will be less than 0.8 ton.Meanwhile electric furnace noise is generally at 90 points
More than shellfish, it is about 70 decibels or so that the present invention, which only has induction furnace noise, and therefore, environmental protection aspect is with obvious effects.
3. production procedure is short：Induction furnace and RH-OB of the present invention are completed to smelt in a station, and flow is：Induction furnace+
RH-OB → LF refining furnace → continuous casting or molding or casting, the turnover quantity and production process bull ladle, seat packet for reducing ladle wait for
Time and traveling crane run time, organization of production is more smooth, thermal loss is few.
4. in terms of variety development：The present invention can not only produce ingot iron, carbon structural steels, structural alloy steel, spring
The Midst-and-low alloy steels such as steel, bearing steel, mould steel, and the high-alloy steel such as high temperature alloy and stainless steel can be produced；And it is traditional
Although electric furnace or converter can produce the excellent special steel product such as carbon structural steels, structural alloy steel, spring steel, bearing steel, in life
The facilities such as VOD, AOD must subsequently be matched when production ultra-low-carbon steel and the high-alloy steel such as high temperature alloy and stainless steel to be produced.Therefore,
The present invention is more advantageous to enterprise's variety development.
5. in terms of mass：The present invention has the function of decarburization, dephosphorization/desulfurization and degassing compared with traditional induction furnace, therefore,
The ingredient of steel is controllable, product impurity content is low, gas content is low, field trash is few, quality height and stable quality.
6. in terms of the utilization of resources：The present invention is conducive to the balanced use of scrap resources.Domestic electric furnace materials are mainly with society
Based on thin material, tubbing and medium-sized, heavy material in steel scrap, iron plane flower is rarely employed；Converter mainly using molten iron as raw material, is equipped with
Based on a small amount of tubbing and medium-sized, heavy material steel scrap, iron plane flower is also rarely employed；Therefore, mechanical processing process in the market is caused
The a large amount of iron plane generated is spent superfluous and cheap.Induction furnace in the present invention due to fusion process not oxygen blast, receive by metal
Yield is high, thin material in iron plane flower that when production is mainly generated with mechanical processing process, social steel scrap etc. for primary raw material, because
This, not only cost advantage is apparent, but also is conducive to utilization of resources balance.
7. smelting process temperature-compensating is flexible：The present invention is that RH-OB carrying vehicles, RH-OB peaces is arranged in the top of induction furnace
In carrying vehicle, when induction furnace is by scrap melting and when being warming up to 1550~1620 DEG C, RH-OB carrying vehicles are started, and by RH-
OB devices are moved to " being vacuum-treated station " above induction furnace, are then the container progress vacuum oxygen for containing molten steel with induction furnace
Refining（RH-OB is refined）, meanwhile, induction furnace can also electrified regulation heating.Therefore, with conventional offline arrangement RH, RH-OB or
The refinings means such as VD, VOD are compared, and smelting process temperature can be with flexible compensation.
Specific implementation mode
To make the technical means, the creative features, the aims and the efficiencies achieved by the present invention be easy to understand, with reference to specific
Embodiment, the present invention is further explained.
Embodiment 1：Ingot iron raw steel smelting process route and smelting process expression
1）Ingot iron raw steel smelting process route：
Cold punching board waste material（C≤0.15%, P≤0.020%, Si≤0.50%）Or carbon steel iron plane spends equal waste materials（By taking 45 steel as an example：C：
0.42~0.50%, P≤0.025%, Si：0.17~0.37%, Mn：0.50~0.80%）→ induction furnace fusing+RH-OB → slags tap
→ LF → continuous casting or molding.
Ingot iron raw steel finished product target：C≤0.0218%, P≤0.015%, S≤0.015%, Si≤0.01%, Mn≤
0.02%。
Function：Induction furnace melting batch, heating, RH-OB do decarburization, dephosphorization refining treatment, reduce gas content；It skimmed
Journey removes high phosphorus slag；LF refining finely tunes alloy, adjustment temperature, pure molten steel；Continuous casting or molding molten steel molding.
2）Smelting process is expressed：
Induction furnace melts cold punching board waste material or iron plane is spent and waits waste materials, works as temperature>At 1550 degree or more, RH-OB vacuum tank cars are opened
It opens to above pending induction furnace, by manually judging induction furnace steel liquid level, then declining vacuum tank to setting height makes RH-
The dip pipe of OB invades one depthkeeping of liquid steel level.It opens argon gas and drives gas, start vacuum pump, RH-OB vacuum chambers is made to reach work
The vacuum degree of skill setting, declines oxygen rifle, is blown into oxygen to the molten steel of RH-OB vacuum chambers, vacuum-oxygen decarbonizing processing is carried out, by steel
In carbon content blow to the carbon content of process stipulation.Carbon content is determined by being analyzed in induction furnace furnace inner sampling.
When carbon content reaches C≤0.0218% in steel, vacuum breaker makes molten steel and the acid slag of oxidation enter induction furnace, so
After restart vacuum pump, so that RH-OB vacuum chambers is reached certain vacuum degree, decline oxygen gun blowing, and be added by feeding device de-
Phosphorus agent（To make high alkalinity oxidizing slag in RH-OB）, dephosphorization treatment is carried out in RH-OB.Phosphorus content passes through in induction furnace stove
Interior sampling analysis determines.When phosphorus content in steel≤0.015%, vacuum breaker promotes RH-OB devices（RH-OB is disposed）.Very
Empty slot rises to standby position and opens vacuum tank car to standby position.Then, induction furnace is skimmed.Induction furnace, which is powered, melts ingot iron
It returns and expects and be warming up to tapping temperature.After temperature component qualification, induction furnace tapping to refining ladle.
Molten steel hangs in LF stoves, and molten steel adds lime, fluorite to make basic slag progress deoxidation, desulfurization, heating in LF stoves.When temperature reaches
When to 1580 degree~1610 degree, when S contents≤0.015%, bull ladle prepares cast.
Low-alloy steel smelting process route and the smeltings such as 2 carbon structural steels of example, structural alloy steel, spring steel, bearing steel
Process expression
1）Smelting process route：
Iron plane is colored, society's steel scrap → induction furnace fusing+RH-OB → is slagged tap → LF → continuous casting, molding or casting.
Function：Induction furnace melting batch, heating, RH-OB do decarburization, dephosphorization refining treatment, reduce gas content；It skimmed
Journey removes high phosphorus slag；LF refining finely tunes alloy, adjustment temperature, pure molten steel；Continuous casting, molding or casting molten steel molding.
2）Smelting process is expressed：
Induction furnace melts iron plane flower and social steel scrap, works as temperature>At 1550 degree or more, opens RH-OB vacuum tank cars and open to waiting locating
It manages above induction furnace, by manually judging induction furnace steel liquid level, then declining vacuum tank to setting height makes the dipping of RH-OB
Pipe invades one depthkeeping of liquid steel level.It opens argon gas and drives gas, start vacuum pump, RH-OB vacuum chambers is made to reach technique initialization
Vacuum degree declines oxygen rifle, is blown into oxygen to the molten steel of RH-OB vacuum chambers, carries out vacuum-oxygen decarbonizing processing, the carbon in steel is contained
Amount blows to the carbon content of process stipulation.Carbon content is determined by being analyzed in induction furnace furnace inner sampling.Then, vacuum breaker makes steel
Water and the acid slag of oxidation enter induction furnace, then restart vacuum pump, and RH-OB vacuum chambers is made to reach the vacuum of technique initialization
Degree declines oxygen gun blowing, and Dephosphorising agent is added by feeding device（To make high alkalinity oxidizing slag in RH-OB）, in RH-OB
Interior carry out dephosphorization treatment.Phosphorus content is determined by being analyzed in induction furnace furnace inner sampling.When phosphorus content in steel≤0.015%, break true
Sky promotes RH-OB devices（RH-OB is disposed）.Vacuum tank rises to standby position and opens vacuum tank car to standby position.So
Afterwards, induction furnace is skimmed.Induction furnace is powered and is warming up to tapping temperature.After temperature component qualification, induction furnace tapping to purified steel
Packet, molten steel hang in LF stoves, molten steel LF stoves add lime, fluorite make basic slag refined, deoxidation, desulfurization, heated up, go to be mingled with,
Adjusting component.Bull ladle is cast after temperature, ingredient, cleanliness factor reach technological requirement.
Example 3 smelts the low-alloy steel technique roads such as carbon structural steels, structural alloy steel, spring steel, bearing steel with material is returned
Line and smelting process expression：
1）Smelting process route：
Material → induction furnace fusing+RH-OB → is returned to steel grade to slag tap → LF → continuous casting, molding or casting.
Function：Induction furnace melting batch, heating, RH-OB decarburization and cr yields reduce gas content；LF refining fine tuning alloy,
Adjust temperature, pure molten steel；Continuous casting, molding or casting molten steel molding.
2）Smelting process is expressed：
Induction furnace fusing is returned with steel grade expects, works as temperature>At 1550 degree or more, opens RH-OB vacuum tank cars and open to pending sense
It answers above stove, by manually judging induction furnace steel liquid level, then declining vacuum tank to setting height makes the dip pipe of RH-OB invade
Enter one depthkeeping of liquid steel level.It opens argon gas and drives gas, start vacuum pump, RH-OB vacuum chambers is made to reach the vacuum of technique initialization
Degree declines oxygen rifle, is blown into oxygen to the molten steel of RH-OB vacuum chambers, carries out vacuum-oxygen decarbonizing processing, the carbon content in steel is blown
It refines to the carbon content of process stipulation, then, stops oxygen blast and promote oxygen rifle.Carbon content is true by being analyzed in induction furnace furnace inner sampling
It is fixed.At the end of decarburization, deoxidation or desulfurizing agent is added by vacuum tank by vacuum hopper, deoxidation and desulfurization are carried out to molten steel, it will be in steel
Sulfur content blow to the sulfur content of process stipulation（Is carried out by thermometric, determine oxygen and determines that chemical analysis can be in induction furnace for molten steel
It is carried out in stove）.Later, vacuum breaker promotes RH-OB devices（RH-OB is disposed）.Vacuum tank rises to standby position and by vacuum
Tank car is opened to standby position.Then, induction furnace is skimmed.Induction furnace is powered and is warming up to tapping temperature.After temperature component qualification, sense
Answer stove tapping to refining ladle, molten steel hangs in LF stoves, molten steel LF stoves add lime, fluorite make basic slag refined, it is deoxidation, de-
Sulphur heats up, goes to be mingled with, adjusting component.Bull ladle is cast after temperature, ingredient, cleanliness factor reach technological requirement.
4 high-alloy steel of example（Alloy amount > 10%）Smelting process route and smelting process expression
1）High-alloy steel smelting process route：
High-alloy steel iron plane such as spends to slag tap → LF → continuous casting, molding or casting at the returns material → induction furnace fusing+RH-OB →.
Function：Induction furnace melting batch and high carbon alloy, heating, RH-OB decarburization and cr yields reduce gas content；LF refining
Finely tune alloy, adjustment temperature, pure molten steel；Continuous casting, molding or casting molten steel molding.
2）Smelting process is expressed：
Induction furnace fusing returns to material, works as temperature>At 1580 degree or more, opens RH-OB vacuum tank cars and open to pending induction furnace
Side, by manually judging induction furnace steel liquid level, then declining vacuum tank to setting height makes the dip pipe of RH-OB invade molten steel
One depthkeeping of liquid level.It opens argon gas and drives gas, start vacuum pump, RH-OB vacuum chambers is made to reach the vacuum degree of technique initialization, decline
Oxygen rifle is blown into oxygen to the molten steel of RH-OB vacuum chambers, carries out vacuum-oxygen decarbonizing processing, the carbon content in steel is blown to work
Carbon content as defined in skill stops oxygen blast and promotes oxygen rifle.Carbon content is determined by being analyzed in induction furnace furnace inner sampling.Decarburization terminates
When, deoxidation or desulfurizing agent are added by vacuum tank by vacuum hopper, deoxidation and desulfurization are carried out to molten steel, the sulfur content in steel is blown
It refines to the sulfur content of process stipulation（Is carried out by thermometric, determine oxygen and determines that chemical analysis can carry out in induction furnace stove for molten steel）.
Later, vacuum breaker promotes RH-OB devices（RH-OB is disposed）Steel treatment finishes.Vacuum tank rises to standby position and will be true
Empty slot vehicle is opened to standby position.Then, induction furnace is skimmed.Induction furnace is powered and is warming up to tapping temperature.After temperature component qualification,
To refining ladle, molten steel hangs in LF stoves for induction furnace tapping, molten steel in LF stoves slag refining, deoxidation, desulfurization, heat up, go to be mingled with, micro-
Adjusting component.Bull ladle is cast after temperature, ingredient, cleanliness factor reach technological requirement.
Claims (7)
1. a kind of induction furnace and RH-OB duplex techniques, it is characterised in that step is：
The first step：Steel scrap is melted in induction furnace, when molten steel amount reaches the 90~98% of furnace capacity in stove, induction furnace stops
Only plus steel scrap, it then heats up, when temperature reaches 1550~1620 DEG C, tilt induction stove carries out deslagging.It will sense after deslagging
It answers stove to be restored to charging station, starts RH-OB carrying vehicles, RH-OB devices are moved to above induction furnace and " are vacuum-treated work
Position " is then turned on and declines RH-OB devices and open argon gas driving gas, the dip pipe of RH-OB is made to invade pending induction furnace
Liquid steel level certain depth.
Second step：Level-one, two level, three-level, level Four, Pyatyi vacuum pump is respectively started to vacuumize, when vacuum tank vacuumizes, molten steel
Pressure difference in the atmospheric pressure and vacuum tank on surface forces molten steel towards flowing in dip pipe.Two dip pipes being connected to vacuum tank,
One is tedge, and one is down-comer.Since tedge is constantly blown into argon gas to molten steel, it is blown into that when gases are heated, they expand, from
And molten steel is driven constantly to rise, the gases such as argon gas, hydrogen, nitrogen, the carbon monoxide in vacuum tank molten steel are flowed through in vacuum state
Under be pumped.The molten steel of degassing constantly recycles repeatedly since proportion increase is flowed into through down-comer in induction furnace again, with regard to this.
Third walks：RH-OB vacuum chambers reach certain vacuum degree, and molten steel face reach a certain height, and decline oxygen rifle, true to RH-OB
The molten steel of empty room is blown into oxygen, and Dephosphorising agent or desulfurizing agent or alloy is added to molten steel in RH-OB vacuum chambers by feeding device
(to make high basicity slag in RH-OB vacuum chambers) carries out vacuum decarburization, dephosphorization, desulfurization, dehydrogenation, denitrogenation and alloy to molten steel
Change.Molten steel component and gas content can be determined by being analyzed in induction furnace furnace inner sampling.
4th step：When carbon content, phosphorus content or the sulfur content in steel blow to process stipulation range.Vacuum breaker, make molten steel and
Basic slag enters induction furnace, promotes RH-OB and starts RH-OB carrying vehicles and is moved into " parking station ".Then, tilt induction
Stove carries out deslagging and skims.Deslagging and induction furnace is restored to charging station after skimming.
5th step：Induction furnace is powered and adds the return material or alloy of smelted steel grade, until molten steel amount reaches the steel of requirements of plan
Then water is warming up to tapping temperature.Induction furnace is tapped to refining ladle after temperature component qualification.It then will refining with driving
Ladle hangs furnaceman LF position and is refined to molten steel.
2. according to claim 1, a kind of induction furnace is with RH-OB duplex technology characteristics：It, will on induction furnace station
Two equipment of RH-OB and induction furnace are superimposed online duplex.It realizes online scrap melting, molten steel heating, vacuum-oxygen decarbonizing, take off
Phosphorus, slag making desulfurization and vacuum outgas, shorten technological process.
3. according to claim 1, a kind of induction furnace is with RH-OB duplex technology characteristics：The duplex technique can not only
Produce the Midst-and-low alloy steels (alloying elements such as ingot iron, carbon structural steels, structural alloy steel, spring steel, bearing steel, mould steel
Total mass fraction < 5% is that the total mass fraction 5%~10% of low-alloy steel, alloying element is medium alloy steel), and can be with
Produce the high-alloy steel such as high temperature alloy and stainless steel (alloying element total mass fraction > 10% claim high-alloy steel).
4. according to claim 1, since the device has the function of decarburization, dephosphorization, desulfurization, degassing and alloying, one
Kind induction furnace is with RH-OB duplex technology characteristics, with induction furnace when producing excellent special steel, steel-casting and ESR ingot, not only may be used
With use return expect, and the thin materials such as material range can be expanded to social steel scrap, waste and old machine, the iron plane of dismounting are spent, tubbing,
The steel scraps such as medium-sized and heavy material.
5. according to claim 1, a kind of induction furnace is with RH-OB duplex technology characteristics：It produces described in claim 3
Steel grade generally uses electric furnace or converter as thick furnace both at home and abroad.The duplex technique spends equal thin materials for main steel scrap with iron plane
Raw material, average oxygen consumption≤30m3/ t steel, slag charge consumption≤20kg/t steel, steel technology≤1040kg/t steel, without electricity
Pole consumes.With electric furnace or converter ratio, steel scrap price is low, the similar steel oxygen consumption of production reduces 15m3It is more than/t steel, slag charge consumption
10kg/t steel or more is reduced, steel technology reduces 10kg/t or more, and alloy recovery is high；With electric furnace than consumption of electrode be 0.Section
About resource, reduce waste sludge discharge, ton steel cost reduces by 200 yuan or more.
6. according to claim 1, a kind of induction furnace is with RH-OB duplex technology characteristics：With the RH-OB phases of non-duplex
Than the fusing of steel scrap and the temperature-rise period of molten steel mainly carry out in induction furnace.It is being opened when temperature reaches 1550~1620 DEG C
In dynamic RH-OB smelting processes, induction furnace can whole feeding temperature-raising, while induction furnace still can be after after RH-OB smelts
Continuous feeding temperature-raising, therefore, liquid steel temperature can flexibly be controlled according to the needs of smelted steel grade.
7. according to claim 1 and 3, a kind of induction furnace is with RH-OB duplex technology characteristics：It produces described in right 3
Steel grade, duplex technological limits [C] >=0.01%, [P] content >=0.010%, [S] content >=0.005%, [H] >=
0.0001%, [N] >=0.0030%.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110819768A (en) * | 2019-11-20 | 2020-02-21 | 马鞍山钢铁股份有限公司 | Method for improving RH vacuum grooving cold steel efficiency for low-carbon aluminum killed steel |
| CN112813230A (en) * | 2020-12-30 | 2021-05-18 | 河钢股份有限公司承德分公司 | Method for vacuum extraction of vanadium from vanadium-containing molten iron |
| CN113136476A (en) * | 2021-04-25 | 2021-07-20 | 新余华峰特钢有限公司 | Slag-removing smelting method for waste steel |
| CN114807779A (en) * | 2022-07-01 | 2022-07-29 | 北京科技大学 | Heavy rail steel and preparation process thereof |
| CN114807778A (en) * | 2022-07-01 | 2022-07-29 | 北京科技大学 | Spring steel and preparation process thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110819768A (en) * | 2019-11-20 | 2020-02-21 | 马鞍山钢铁股份有限公司 | Method for improving RH vacuum grooving cold steel efficiency for low-carbon aluminum killed steel |
| CN112813230A (en) * | 2020-12-30 | 2021-05-18 | 河钢股份有限公司承德分公司 | Method for vacuum extraction of vanadium from vanadium-containing molten iron |
| CN113136476A (en) * | 2021-04-25 | 2021-07-20 | 新余华峰特钢有限公司 | Slag-removing smelting method for waste steel |
| CN114807779A (en) * | 2022-07-01 | 2022-07-29 | 北京科技大学 | Heavy rail steel and preparation process thereof |
| CN114807778A (en) * | 2022-07-01 | 2022-07-29 | 北京科技大学 | Spring steel and preparation process thereof |
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