CN110438389A - A kind of high-purity rare earth steel production method - Google Patents
A kind of high-purity rare earth steel production method Download PDFInfo
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- CN110438389A CN110438389A CN201910872363.7A CN201910872363A CN110438389A CN 110438389 A CN110438389 A CN 110438389A CN 201910872363 A CN201910872363 A CN 201910872363A CN 110438389 A CN110438389 A CN 110438389A
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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
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/02—Dephosphorising or desulfurising
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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
- C21C5/28—Manufacture of steel in the converter
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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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
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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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention discloses a kind of high-purity rare earth steel production methods, belong to rare earth steel production technical field.High-purity rare earth steel production method of the invention, including molten iron pretreatment, converter smelting, RH refining and continuous casting working procedure, rare earth element is added in RH refining procedure, wherein the initial cycle flow control of RH refining is 2800~3200NL/min, after pure degassing 4~5 minutes, circular flow is adjusted to 1000~1400NL/min, and rare earth element is added at this time, pure degassing is pressed again after 7~8 minutes, is cast after 11~12 minutes calm after multiple pressure.Rare earth is added using this method, rare earth recovery rate is stablized in 20-25%, and the mouth of a river is poured without dross, it can be achieved that more than 10 furnaces connecting.
Description
Technical field
The invention belongs to rare earth steel production technical fields, add more specifically to a kind of CSP process smelting procedure rare earth
Enter method.
Background technique
Molten Steel Cleanliness control is the most essential steps during high-quality steel is standby, and inclusion content and inclusion size are steel
The most important index of middle degree of purity.But since steel products smelt production process long flow path, controlling unit is more, therefore there are steel
Middle inclusion content is higher with the larger problem of inclusion size, the case where entire oxygen content in the steel content is more than 15ppm usually occurs, and
And field trash grade is also relatively high.Since rare earth in steel has cleaning molten steel, improvement field trash, alloying improved performance etc. excellent
Point, thus the research of rare earth steel more and more attention has been paid to.
But due to being limited by existing smelting process, the recovery rate of rare earth is extremely unstable in products obtained therefrom after addition rare earth,
To easily causing properties of product unstable, while the addition of rare earth element is also easy to that mouth of a river knot is caused to evaporate, 1 furnace of continuous production or
2 furnaces are still possible to, but are even poured 3 furnaces or more and produced more difficulty.Therefore, the product of rare earth steel is not universal at present, how to solve
The stability and nozzle clogging problem of rare earth recovery rate become the key link for restricting rare earth steel development.
Through retrieving, about rare earth recovery rate stability is improved, the patent for improving rare earth additive effect is existing related open.
Such as, the application case that Chinese Patent Application No. is 2017100599806 discloses a kind of high-purity rare earth steel processing side
Lanthanum cerium mixing pure rare earth is added in LF refining, VD/RH are vacuum-treated or three liquid steel refinings of soft blow are handled in method, this application,
Rare earth adding quantity is according to steel oxygen in water ODissolved oxygen, total oxygen T.0, sulfur content S and refining basicity of slag R=CaO/SiO2、FeO+
MnO total content is added, and reaches the function and effect of rare earth purification molten steel, rotten fine foreign matter.But using this application
Rare earth adding technology rare earth recovery rate is lower (about 3.0%~6.6%), thus its only limit addition rare earth element as lanthanum, cerium, it is right
In more active rare earth element, such as neodymium, recovery rate will be lower.
For another example, the application case that Chinese Patent Application No. is 2016106310462, which discloses in a kind of steel, adds rare earth metal
High performance method is proposed, being able to solve after rare earth is added in steel to a certain extent using the technique of this application leads to performance
Unstable problem, and avoid nozzle blocking.But the additional amount that rare earth metal is only gived in this application is 0.05~1.0kg/t
Steel, recovery rate do not embody, and rare earth plays a role, stability is that the stability of recovery rate, this point case exactly do not have
It is described；In addition the rare earth metal that the case is added is the mixture of lanthanum, cerium or lanthanum and cerium, is confined to both metals, for
The more active rare earth metal of performance, such as neodymium, europium, effect is unknown in this way；And preceding rare earth metal is added in this method
Block is made, then is packed with clean closed container, brings difficulty to raw material preparation；Soft mixing time exists after additionally incorporating rare earth
10min or more (optimal 15min) causes temperature drop larger.
Summary of the invention
1. to solve the problems, such as
Easily cause rare earth recovery rate unstable using existing rare earth steel production technology it is an object of the invention to overcoming and
The deficiency for the problem that evaporates is tied at the mouth of a river, provides a kind of high-purity rare earth steel production method.The present invention by before rare earth is added, it adds
Entire process flow after entering process and being added optimizes, and is matched by the coordination of front and back process, so as to effective
Guarantee the recovery rate of rare earth element and its stability of recovery rate, and solves the problems, such as that mouth of a river knot evaporates.
2. technical solution
To solve the above-mentioned problems, the technical solution adopted in the present invention is as follows:
A kind of high-purity rare earth steel production method of the invention, including molten iron pretreatment, converter smelting, RH refining and continuous casting
Rare earth element is added in process in RH refining procedure, and wherein the initial cycle flow control of RH refining is 2800~3200NL/
Min, after pure degassing 4~5 minutes, circular flow is adjusted to 1000~1400NL/min, and rare earth element, pure degassing are added at this time
It presses after 7~8 minutes, casts after 11~12 minutes calm after multiple pressure again.
Further, the rare earth element is any one of rare earth metals such as cerium, lanthanum, neodymium, europium or two kinds or more
Combination, and control rare earth in O, C, S impurity content are as follows: O≤0.0010%, C≤0.0010%, S≤0.0010%, [O
+ C+S]≤0.0020%.
Further, the molten iron bare area after desulfurizing iron process is skimmed is controlled in the hot metal pre process procedures not
Lower than 98%, molten iron temperature is 1320 DEG C~1330 DEG C.
Further, clean steel scrap is added in the converter smelting process, steel scrap is added than (i.e. adding amount of scrap steel accounts for smelting
Smelt iron the percentage of water inventory) it is strict controlled in 3-5%, component requirements are as follows: C≤0.003%, S≤0.003%, O≤
0.003%, [S+O]≤0.005%, Si:0.15~0.20%, Al:0.20~0.30%, Ti≤0.002%, and converter smelting
After control tapping the time be 5~7 minutes.
Further, the converter smelting process matches additional amount according to tapping oxygen amount adjustment slag, when terminal oxygen content
When higher than 300ppm, control lime, synthetic slag consumption proportion are (3.2~3.3): 1, it is on the contrary then control lime, synthetic slag dosage
Proportion is (2.4~2.5): 1.
Further, slag charge is initially added into when converter smelting tapping 1/3, when tapping 2/3, which is added, to be finished, and tapping starts
It is controlled using argon gas amount in 150-250NL/min to argon gas amount control when tapping 2/3 in 1600~1700NL/min, residue 1/3.
Further, the converter smelting process puts into aluminum shot into ladle according to tapping oxygen amount and carries out top slag modification,
When oxygen content is 800-1000ppm, the control of aluminum shot additional amount is 300~400kg；When oxygen content is 600-800ppm, control
Aluminum shot additional amount is 100~200kg；As oxygen content < 600ppm, control aluminum shot additional amount is 40-70kg.
Further, the continuous casting process control nitrogen pick-up is less than 2ppm, wherein heavy slab, sheet billet drawing speed difference
For 0.8~1.0m/min, 2.5~4m/min.
3. beneficial effect
Compared with the prior art, the invention has the benefit that
(1) a kind of high-purity rare earth steel production method of the invention, including molten iron pretreatment, converter smelting, RH refining and
Rare earth element is added in RH process, and to the RH refining circular flow before rare earth element addition, when being added and takes off for continuous casting working procedure
Gas time and calm time optimize control, so that degasifying effect on the one hand can be effectively ensured, prevent vortex phenomenon,
On the other hand it is possible to prevente effectively from excessive re inclusion remains in molten steel, cause nozzle blocking and nozzle clogging, and prevent
Only rare earth recovery rate drastically reduces, and advantageously ensures that the stability of rare earth recovery rate.
(2) a kind of high-purity rare earth steel production method of the invention, by rare earth be added before hot metal pre process procedures and
Converter smelting process optimizes, and provides the molten steel of high quality so as to the addition for rare earth, before stablizing rare earth addition
Liquid steel temperature and ingredient, and then be conducive to be further ensured that effect is added in rare earth.
(3) a kind of high-purity rare earth steel production method of the invention is matched by the technological innovation and coordination of front and back process,
It may be implemented to connect and pour after rare earth is added, and rare earth recovery rate stabilization is poured in 20-25%, it can be achieved that more than 10 furnaces connecting in steel, even if
When content of rare earth reaches 0.030% in steel, without dross, result can be widened to the life of related variety steel at the casting process mouth of a river
It produces.
Specific embodiment
A kind of high-purity rare earth steel production method of the invention, including molten iron pretreatment, converter smelting, RH refining and continuous casting
Process, wherein rare earth element is added in RH refining procedure, by smelting environment before rare earth is added, rare earth adition process and
Rare earth is added last handling process and optimizes, and is matched by the technological innovation and coordination of front and back process, realizes and rare earth is added
After connect and pour, and it is possible to prevente effectively from nozzle clogging phenomenon occurs after rare earth is added, and rare earth element in steel can be effectively ensured and receive
The stability of rate.
It is of the invention the specific process is as follows:
(1) molten iron pre-processes
Pre- desulfurization carried out to supplied materials molten iron, sulfur content control hereinafter, then carry out taking off Slag treatment, needs to guarantee 0.002%
Skim rate, i.e., control skim after molten iron bare area not less than 98%, to prevent impurity in slag from entering smelting procedure, same to time control
Molten iron temperature processed is 1320 DEG C~1330 DEG C, provides suitable temperature for subsequent handling.
(2) converter smelting
Since smelting cycle increases after rare earth is added, the impurity elements such as S, O, C, N are required to improve, therefore in order to be rare earth
Addition is prepared, and steel scrap is added ratio and is strict controlled in 3-5%, far below the 8~10% of common process.While in order to improve steel scrap
Impurity element control, prevent from bringing into excessive impurity, reduce molten iron pretreating effect, the steel scrap using self-produced clean steel scrap,
Its Composition Control are as follows: C≤0.003%, S≤0.003%, O≤0.003%, [S+O]≤0.005%, Si:0.15~0.20%,
Al:0.20~0.30%, Ti≤0.002%.The control tapping time is 5~7 minutes after converter smelting, while steel when tapping
Stream cannot disperse.The time tapped less than 5 minutes, slag charge addition has little time, unevenly；Tap the time be greater than 7 minutes, temperature drop compared with
More, subsequent handling RH temperature, pressure is big.
Additional amount is matched according to tapping oxygen amount adjustment slag, guarantees that lime all melts in tapping process, reduces and aoxidizes in slag
Property.Specifically, control lime, synthetic slag consumption proportion are (3.2~3.3) when terminal oxygen content is higher than 300ppm: 1, it is on the contrary
Then control lime, synthetic slag consumption proportion is (2.4~2.5): 1.Slag charge, tapping 2/3 are initially added into when converter smelting tapping 1/3
When be added and finish, and tapping starts that in 1600~1700NL/min, residue 1/3 uses argon gas to argon gas amount control when tapping 2/3
Amount control is in 150-250NL/min.In addition, putting into aluminum shot into ladle according to tapping oxygen amount carries out top slag modification, work as oxygen content
For 800-1000ppm, the control of aluminum shot additional amount is 300~400kg；When oxygen content is 600-800ppm, control aluminum shot is added
Amount is 100~200kg；As oxygen content < 600ppm, control aluminum shot additional amount is 40-70kg.
(3) RH is refined
Rare earth element is added in RH refining procedure, the rare earth element is any one of rare earth metals such as cerium, lanthanum, neodymium
Or two kinds or more of combination, even if pre-treatment and smelting procedure control are stringent again, when the rare earth of addition itself bring into it is more
When impurity element, a large amount of field trash can be generated, reduces recovery rate, therefore the ingredient of rare earth is added in the application strict control, especially
It is the impurity contents such as C, S, O, specifically, controlling O, C, S impurity content in rare earth in the application are as follows: O≤
0.0010%, C≤0.0010%, S≤0.0010%, [O+C+S]≤0.0020%.
In order to guarantee that effect is added in rare earth, the application carries out strict control to circular flow and degassing time.Wherein RH essence
The initial cycle flow control of refining is 2800~3200NL/min, to guarantee quick deoxidation, decarburization, dehydrogenation, if circular flow is high
In this range, first is that reducing vacuum degree, degasifying effect is influenced, second is that vortex phenomenon can be generated, further decreases purifying effect；
If circular flow is lower than above range, deoxidation is not thorough, and is caused oxygen content before rare earth is added to be higher than 30ppm, is generated after addition
A large amount of tiny rare earth oxides are mingled with, and leave and block the mouth of a river into steel, while reducing RE alloyed effect.Through pure degassing 4
Hydrogen is taken off to lower than 1ppm in~5 minutes, oxygen is lower than 30ppm, and carbon is lower than 20ppm, and adjustment circular flow is 1000~1400NL/
Rare earth element is added in min at this time.Although degasifying effect can also be further increased by increasing degassing time, smelting cycle increases, leads
It causes to reduce production efficiency, while reducing liquid steel temperature, and degassing time is shorter, then degassing is not thorough.After being added due to RH alloy
It will increase circular flow, acceleration component is uneven and inclusion floating.Therefore, it reduces and follows when rare earth element is added in the application
Ring, on the one hand guarantee that rare earth element rapid melting and can be uniformly distributed, and on the other hand can be reduced temperature loss, be avoided
Generate cold steel.
It is pressed again after the pure degassing of rare earth element being added 7~8 minutes, the time will have excessive re inclusion to remain in steel too early
Liquid, time excessively then will lead to rare earth recovery rate and drastically reduces.It casts after calmness 11~12 minutes after multiple pressure, the calm time
It is longer to will affect pouring temperature and rhythm of production, and calm time less rare earth is mingled with floating and is not thorough, so that the mouth of a river be caused to tie
Tumor.
(4) continuous casting
Continuous casting process controls nitrogen pick-up and is less than 2ppm, and heavy slab, sheet billet drawing speed are respectively 0.8~1.0m/min, 2.5
~4m/min keeps even pace.
The application carries out accurate control by pre-processing molten iron to the full process of casting process, and casting process is smooth, anhydrous
Mouthful dross phenomenon can be realized 10 furnaces or more and connect and pours, and rare earth recovery rate can be stablized in 20-25% in steel.Due to many rare earths
The activity of metal is greater than lanthanum, cerium, and such as rare earth neodymium, smelting process is more oxidizable, and recovery rate is extremely unstable, therefore existing work
The addition of reactive rare earth metal is relatively fewer in skill, and the application can successfully solve this technical problem.For steady production, surely
Determine rare earth recovery rate, it is extremely narrow to pre-process the process window to continuous casting process from molten iron, deviates this technology controlling and process, will cause rare earth
Recovery rate is unstable or nozzle clogging occurs or influences rhythm of production.And the acquisition of this technique is in 200 tons of converter-RH
In the industrialized production of refining, about tens furnaces verify lower acquisition repeatedly, in abrasion-resistant stee, electrical sheet, ship steel, pipe line steel etc.
Carry out production application in variety steel, rare earth recovery rate is stablized, and without nozzle clogging, realize sequence casting, result can widen to
The production of related variety steel.
The present invention is further described below combined with specific embodiments below.
Embodiment 1:
Non-orientation silicon steel smelting is carried out using 200 tons of converters, pre- desulfurization is carried out to supplied materials molten iron, sulfur content control exists
0.002% hereinafter, carry out taking off Slag treatment, for bare area 98%, molten iron temperature is 1320 DEG C.In order to quasi- to add rare earth to carry out
Standby, steel scrap is added 6 tons in converter, and steel scrap uses self-produced steel scrap, Composition Control are as follows: and C≤0.003%, S≤0.003%, O≤
0.003%, [S+O]≤0.005%, Si:0.15%, Al:0.30%, Ti≤0.002%, when tapping 1/3 is added slag charge, and 2/3
When be added and finish, when tapping 2/3, guarantees the control of argon gas amount in 1700NL/min, and residue 1/3 uses Small Flow Control 200NL/
min；The control tapping time is 5 minutes after converter smelting.
RH circular flow 3000NL/min, for pure degassing time after 4 minutes, circular flow is adjusted to 1200NL/min, this
When pure rare earth neodymium 40kg is added, 7 minutes multiple pressures of pure degassing are cast after 12 minutes calm.The control nitrogen pick-up of CSP continuous casting process is less than
2ppm, drawing speed 4.0m/min.Casting process is smooth in the present embodiment, no nozzle clogging phenomenon, and rare earth recovery rate is
20%.
Comparative example 1:
Non-orientation silicon steel smelting is carried out using 200 tons of converters, pre- desulfurization is carried out to supplied materials molten iron, sulfur content control exists
0.002% hereinafter, carry out taking off Slag treatment, bare area is 98%, 1320 DEG C of temperature.In order to for plus rare earth be prepared, converter
Middle steel scrap is added 6 tons, and steel scrap uses self-produced steel scrap, and when tapping 1/3 is added slag charge, and 2/3 when, which is added, to be finished, and when tapping 2/3 guarantees
The control of argon gas amount uses Small Flow Control 200NL/min in 1700NL/min, residue 1/3.RH circular flow 3000NL/min is pure
After degassing time 4 minutes, circular flow is adjusted to 1200NL/min, and pure rare earth neodymium 40kg is added at this time, and pure degassing 5 minutes multiple
Pressure is cast after 8 minutes calm.CSP continuous casting process controls nitrogen pick-up and is less than 2ppm, drawing speed 4.0m/min.Casting process casting
There is wadding steel phenomenon in machine, afterwards by just completing casting after stopper rise height 22mm, can not even pour.Mouth of a river floccule is divided
Analysis, wadding steel reason are that rare earth oxide and sulfide are bonded in caused by the surface of the mouth of a river.
Comparative example 2:
Non-orientation silicon steel smelting is carried out using 200 tons of converters, pre- desulfurization is carried out to supplied materials molten iron, sulfur content control exists
0.002% hereinafter, carry out taking off Slag treatment, bare area is 98%, 1320 DEG C of temperature.In order to for plus rare earth be prepared, converter
Middle steel scrap is added 6 tons, and steel scrap uses self-produced steel scrap, and when tapping 1/3 is added slag charge, and 2/3 when, which is added, to be finished, and when tapping 2/3 guarantees
The control of argon gas amount uses Small Flow Control 200NL/min in 1700NL/min, residue 1/3.RH circular flow 3000NL/min is pure
After degassing time 4 minutes, circulation is adjusted to 1200NL/min, and pure rare earth neodymium 40kg is added at this time, and pure degassing 10 minutes multiple
Pressure is cast after 15 minutes calm.CSP continuous casting process controls nitrogen pick-up and is less than 2ppm, drawing speed 4.0m/min.Casting process is suitable
Benefit, no nozzle clogging phenomenon, but rare earth recovery rate is only 3.8%.
Embodiment 2:
Non-orientation silicon steel smelting is carried out using 200 tons of converters, pre- desulfurization is carried out to supplied materials molten iron, sulfur content control exists
0.002% hereinafter, carry out taking off Slag treatment, for bare area 99%, molten iron temperature is 1330 DEG C.In order to quasi- to add rare earth to carry out
Standby, steel scrap is added 6 tons in converter, and steel scrap uses self-produced steel scrap, Composition Control are as follows: and C≤0.003%, S≤0.003%, O≤
0.003%, [S+O]≤0.005%, Si:0.20%, Al:0.20%, Ti≤0.002%, when tapping 1/3 is added slag charge, and 2/3
When be added and finish, when tapping 2/3, guarantees the control of argon gas amount in 1600NL/min, and residue 1/3 uses Small Flow Control 150NL/
min；The control tapping time is 7 minutes after converter smelting.
RH circular flow 3200NL/min, for pure degassing time after 5 minutes, circular flow is adjusted to 1400NL/min, this
When cerium and lanthanum total 40kg, 8 minutes multiple pressures of pure degassing is added, calmness is cast after 11 minutes.Slab CC machine process control increases
Nitrogen is less than 2ppm, drawing speed 1.0m/min.Casting process is smooth in the present embodiment, and no nozzle clogging phenomenon, rare earth is received
Rate is 25%.
Embodiment 3:
Non-orientation silicon steel smelting is carried out using 200 tons of converters, pre- desulfurization is carried out to supplied materials molten iron, sulfur content control exists
0.002% hereinafter, carry out taking off Slag treatment, for bare area 96%, molten iron temperature is 1325 DEG C.In order to quasi- to add rare earth to carry out
Standby, steel scrap is added 6 tons in converter, and steel scrap uses self-produced steel scrap, Composition Control are as follows: and C≤0.003%, S≤0.003%, O≤
0.003%, [S+O]≤0.005%, Si:0.18%, Al:0.26%, Ti≤0.002%, when tapping 1/3 is added slag charge, and 2/3
When be added and finish, when tapping 2/3, guarantees the control of argon gas amount in 1670NL/min, and residue 1/3 uses Small Flow Control 250NL/
min；The control tapping time is 6 minutes after converter smelting.
RH circular flow 2800NL/min, for pure degassing time after 4 minutes, circular flow is adjusted to 1000NL/min, this
When cerium, lanthanum, neodymium total 40kg, 8 minutes multiple pressures of pure degassing is added, calmness is cast after 12 minutes.CSP continuous casting process controls nitrogen pick-up
Less than 2ppm, drawing speed 3.5m/min.Casting process is smooth in the present embodiment, no nozzle clogging phenomenon, rare earth recovery rate
It is 22%.
Claims (8)
1. a kind of high-purity rare earth steel production method, including molten iron pretreatment, converter smelting, RH refining and continuous casting working procedure, special
Sign is: rare earth element being added in RH refining procedure, wherein the initial cycle flow control of RH refining is 2800~3200NL/
Min, after pure degassing 4~5 minutes, circular flow is adjusted to 1000~1400NL/min, and rare earth element, pure degassing are added at this time
It presses after 7~8 minutes, casts after 11~12 minutes calm after multiple pressure again.
2. a kind of high-purity rare earth steel production method according to claim 1, it is characterised in that: the rare earth element is
The combination of any one of cerium, lanthanum, neodymium, europium or two kinds or more, and control O, C, S impurity content in rare earth are as follows: O≤
0.0010%, C≤0.0010%, S≤0.0010%, [O+C+S]≤0.0020%.
3. a kind of high-purity rare earth steel production method according to claim 1, it is characterised in that: the molten iron pre-processes work
The molten iron bare area after desulfurizing iron process is skimmed is controlled in sequence not less than 98%, molten iron temperature is 1320 DEG C~1330 DEG C.
4. a kind of high-purity rare earth steel production method according to any one of claim 1-3, it is characterised in that: described turn
Clean steel scrap is added in furnace smelting procedure, steel scrap is added ratio and is strict controlled in 3-5%, component requirements are as follows: C≤0.003%, S
≤ 0.003%, O≤0.003%, [S+O]≤0.005%, Si:0.15~0.20%, Al:0.20~0.30%, Ti≤
0.002%, and the control tapping time is 5~7 minutes after converter smelting.
5. a kind of high-purity rare earth steel production method according to claim 4, it is characterised in that: the converter smelting process
Additional amount is matched according to tapping oxygen amount adjustment slag, when terminal oxygen content is higher than 300ppm, controls lime, synthetic slag consumption proportion
For (3.2~3.3): 1, it is on the contrary then control lime, synthetic slag consumption proportion is (2.4~2.5): 1.
6. a kind of high-purity rare earth steel production method according to claim 5, it is characterised in that: converter smelting tapping 1/3
When be initially added into slag charge, when tapping 2/3, which is added, to be finished, and tapping start to argon gas amount control when tapping 2/3 1600~
1700NL/min, residue 1/3 are controlled using argon gas amount in 150-250NL/min.
7. a kind of high-purity rare earth steel production method according to claim 4, it is characterised in that: the converter smelting process
Aluminum shot is put into ladle according to tapping oxygen amount and carries out top slag modification, when oxygen content is 800-1000ppm, the control of aluminum shot additional amount
For 300~400kg；When oxygen content is 600-800ppm, control aluminum shot additional amount is 100~200kg；As oxygen content <
When 600ppm, control aluminum shot additional amount is 40-70kg.
8. a kind of high-purity rare earth steel production method according to any one of claim 1-3, it is characterised in that: this method
Suitable for traditional heavy slab and CSP sheet billet process, the continuous casting process control nitrogen pick-up is less than 2ppm, wherein heavy slab throwing speed
Degree is 0.8~1.0m/min, and sheet billet drawing speed is 2.5~4.0m/min.
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