CN108220530A - The sublimate method of low carbon high alloy steel - Google Patents
The sublimate method of low carbon high alloy steel Download PDFInfo
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- CN108220530A CN108220530A CN201810042651.5A CN201810042651A CN108220530A CN 108220530 A CN108220530 A CN 108220530A CN 201810042651 A CN201810042651 A CN 201810042651A CN 108220530 A CN108220530 A CN 108220530A
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 61
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 61
- 229910000851 Alloy steel Inorganic materials 0.000 title claims abstract description 35
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 369
- 239000010959 steel Substances 0.000 claims abstract description 369
- XKRFYHLGVUSROY-UHFFFAOYSA-N argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 84
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminum Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 54
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 53
- 238000007670 refining Methods 0.000 claims abstract description 52
- 239000001301 oxygen Substances 0.000 claims abstract description 50
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 50
- MYMOFIZGZYHOMD-UHFFFAOYSA-N oxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims abstract description 50
- 229910052786 argon Inorganic materials 0.000 claims abstract description 42
- 239000010813 municipal solid waste Substances 0.000 claims abstract description 37
- 239000004411 aluminium Substances 0.000 claims abstract description 29
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 27
- 238000007664 blowing Methods 0.000 claims abstract description 25
- 239000007789 gas Substances 0.000 claims abstract description 25
- 150000002910 rare earth metals Chemical class 0.000 claims abstract description 22
- 230000002308 calcification Effects 0.000 claims abstract description 18
- 239000000428 dust Substances 0.000 claims abstract description 17
- 238000009749 continuous casting Methods 0.000 claims abstract description 13
- 238000000465 moulding Methods 0.000 claims abstract description 13
- 238000001556 precipitation Methods 0.000 claims abstract description 13
- 239000002893 slag Substances 0.000 claims description 74
- 229910045601 alloy Inorganic materials 0.000 claims description 30
- 239000000956 alloy Substances 0.000 claims description 30
- 238000000034 method Methods 0.000 claims description 26
- REDXJYDRNCIFBQ-UHFFFAOYSA-N aluminium(3+) Chemical class [Al+3] REDXJYDRNCIFBQ-UHFFFAOYSA-N 0.000 claims description 25
- 239000012535 impurity Substances 0.000 claims description 24
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 24
- 238000005266 casting Methods 0.000 claims description 22
- 239000000843 powder Substances 0.000 claims description 22
- 238000010079 rubber tapping Methods 0.000 claims description 21
- 238000007254 oxidation reaction Methods 0.000 claims description 18
- 238000002844 melting Methods 0.000 claims description 17
- 230000003647 oxidation Effects 0.000 claims description 16
- 241000985665 Cecropia obtusifolia Species 0.000 claims description 13
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 13
- 238000005275 alloying Methods 0.000 claims description 13
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 13
- 239000007788 liquid Substances 0.000 claims description 13
- 229910052748 manganese Inorganic materials 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 9
- UIXRSLJINYRGFQ-UHFFFAOYSA-N Calcium carbide Chemical compound [Ca+2].[C-]#[C-] UIXRSLJINYRGFQ-UHFFFAOYSA-N 0.000 claims description 8
- 239000005997 Calcium carbide Substances 0.000 claims description 8
- 238000006392 deoxygenation reaction Methods 0.000 claims description 8
- 238000006477 desulfuration reaction Methods 0.000 claims description 8
- 230000003009 desulfurizing Effects 0.000 claims description 8
- 229910052710 silicon Inorganic materials 0.000 claims description 8
- 239000010703 silicon Substances 0.000 claims description 8
- OSMSIOKMMFKNIL-UHFFFAOYSA-N calcium;silicon Chemical compound [Ca]=[Si] OSMSIOKMMFKNIL-UHFFFAOYSA-N 0.000 claims description 7
- 238000005070 sampling Methods 0.000 claims description 7
- 239000000126 substance Substances 0.000 claims description 7
- PNEYBMLMFCGWSK-UHFFFAOYSA-N AI2O3 Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 6
- 229910052593 corundum Inorganic materials 0.000 claims description 6
- 230000004224 protection Effects 0.000 claims description 6
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 6
- 229910000616 Ferromanganese Inorganic materials 0.000 claims description 5
- 238000004458 analytical method Methods 0.000 claims description 5
- 239000004615 ingredient Substances 0.000 claims description 5
- 229910052742 iron Inorganic materials 0.000 claims description 5
- 239000011435 rock Substances 0.000 claims description 5
- 238000009792 diffusion process Methods 0.000 claims description 4
- 238000005502 peroxidation Methods 0.000 claims description 4
- 238000004364 calculation method Methods 0.000 claims description 3
- 229910052804 chromium Inorganic materials 0.000 claims description 3
- 238000007667 floating Methods 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 229910052698 phosphorus Inorganic materials 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 9
- 238000003672 processing method Methods 0.000 abstract description 2
- 238000009826 distribution Methods 0.000 description 27
- 239000011572 manganese Substances 0.000 description 10
- 239000000047 product Substances 0.000 description 8
- 238000003723 Smelting Methods 0.000 description 7
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 7
- 238000005452 bending Methods 0.000 description 6
- PWHULOQIROXLJO-UHFFFAOYSA-N manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 6
- 229910052684 Cerium Inorganic materials 0.000 description 4
- 229910052746 lanthanum Inorganic materials 0.000 description 4
- 238000009628 steelmaking Methods 0.000 description 4
- -1 Rare earth alloy Chemical class 0.000 description 3
- 230000006399 behavior Effects 0.000 description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 3
- 229910052791 calcium Inorganic materials 0.000 description 3
- 239000011575 calcium Substances 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 229910000655 Killed steel Inorganic materials 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 239000007795 chemical reaction product Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229920001296 polysiloxane Polymers 0.000 description 2
- 229910000746 Structural steel Inorganic materials 0.000 description 1
- 206010044565 Tremor Diseases 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N silicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
- B22D1/002—Treatment with gases
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/50—Pouring-nozzles
- B22D41/58—Pouring-nozzles with gas injecting means
-
- 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
-
- 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
- C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
-
- 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
- C21C7/06—Deoxidising, e.g. killing
-
- 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
-
- 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
Abstract
A kind of sublimate method of low carbon high alloy steel is related to molten steel sublimate technical field, especially belongs to a kind of deoxidation of low carbon high alloy steel and the sublimate processing method of removal of inclusions.It is characterised in that it includes following steps：（1）During electric furnace/converter is just refined：The theoretical blowing oxygen quantity needed for blowing is formulated, using carbon dust pre-deoxidation and aluminium ball precipitation desoxydation；（2）During LF refining：Aluminum steel is fed according to [O] content in molten steel, using diffusive deoxidation；（3）During VD/RH is refined：Carry out calcification processing, rare earth treatment；（4）During soft blow：Control soft blow time, BOTTOM ARGON BLOWING intensity and the argon flow amount of molten steel；（5）During molding/continuous casting：It is protected using argon gas.The present invention has the deoxidation effect that can significantly improve low carbon high alloy steel, effectively removes the field trash of low carbon high alloy steel, significantly reduces entire oxygen content in the steel content and inclusion behavior, improves the good effect of the degree of purity of steel.
Description
Technical field
The present invention relates to molten steel sublimate technical fields, especially belong to a kind of deoxidation of low carbon high alloy steel and removal folder
The sublimate processing method of sundries.
Background technology
With the development of iron and steel smelting technology, the requirement to steel degree of purity is higher and higher, particularly advanced bearing steel, advanced
Cutting line, advanced cord steel, super critical boiler steel for pipe are all to the degree of purity of steel（Total oxygen content, all kinds of inclusion behaviors, its
Its impurity content etc.）There is the requirement of intimate harshness." high purity steel " is a kind of steel product, is referred to containing non-metallic inclusion
Seldom steel with gas, various field trashes, as oxide, sulfide, silicate, hydrogen, oxygen, nitrogen content be required to it is very low.
It was verified that the degree of purity of steel is higher, performance is higher, and service life is also longer.Impurities in steel drops to certain level
When, qualitative change will occur for the performance of steel.Therefore, high purity steel can be widely applied to defence and military, hi-tech industry and machine
In the high-end products such as tool, automobile, there is better development prospect and widely application.
Electric furnace/pneumatic steelmaking later stage dissolves in excessive oxygen since oxygen blast is fluxing, and excessive oxygen makes to be precipitated during solidification of molten steel
Formation oxide is mingled with and bubble, directly affects strand and steel product quality.Molten steel terminal oxygen content is steel inclusion
Source, therefore reduction molten steel terminal oxygen content is needed in smelting process.At present, it is mainly adopted in domestic industry steelmaking process
With aluminium deoxidation, i.e., aluminium is added in molten steel in tapping and refining process, although the method is simple, deoxidation effect and shakiness
It is fixed, easily generate Al2O3Type impurity.Due to Al2O3Type impurity fusing point is high, and into cotton-shaped distribution in molten steel, particle is tiny not
Easy floating slag input, easily causes nonmetallic inclusionsin steel to increase, so as to cause the total oxygen content in molten steel and each type impurity
Rank remains high, and then influences steel and be applied in more high-end product.Therefore, the deoxidation effect of low carbon high alloy steel is improved
Fruit removes the field trash of low carbon high alloy steel, and the degree of purity for improving steel is that there is an urgent need to solve in current iron and steel smelting technology field
Certainly the problem of.
Invention content
The sublimate method of low carbon high alloy steel a kind of is provided it is an object of the invention to be directed to above-mentioned defect,
To reach the deoxidation effect for improving low carbon high alloy steel, effectively remove field trash, reduce entire oxygen content in the steel content and inclusion behavior,
Improve the purpose of the degree of purity of steel.
The sublimate method of low carbon high alloy steel provided by the present invention, which is characterized in that include the following steps：
（1）Sublimate during electric furnace/converter just refining
It is theoretical according to needed for the chemical composition of each element in melting down rear molten steel formulates follow-up blowing after electric furnace/converter melting down phase
Blowing oxygen quantity, to prevent the extent of peroxidation of molten steel；
Deoxidation products in molten steel is reduced using carbon dust pre-deoxidation and aluminium ball precipitation desoxydation in electric furnace/converter tapping process
Al2O3Content；
（2）Sublimate during LF refining
When the refining of LF stoves is in place, deoxidation is carried out according to the aluminum steel of [O] content feeding respective numbers in molten steel；
During LF refining it is whole using diffusive deoxidation so as to while deoxygenation of liquid steel is reached, eliminate or reduce deoxidation products into
Enter the quantity of molten steel；
（3）Sublimate during VD/RH refinings
Calcification processing is carried out before molten steel carries out VD/RH refinings, to increase the time that field trash floats in molten steel, it is made to the greatest extent may be used
It can ground exclusion molten steel；
Rare earth treatment is carried out to molten steel after VD/RH processing, to reach further to deoxygenation of liquid steel, desulfurization and the rotten mesh being mingled with
's；
（4）Sublimate during soft blow
Field trash is made further fully to float and take off deeply by the way that molten steel soft blow time, BOTTOM ARGON BLOWING intensity and argon flow amount is controlled to reach
The purpose of oxygen；
（5）Sublimate during molding/continuous casting
In molten steel casting process the secondary oxidation of molten steel is avoided by the way of argon gas protection.
The sublimate method of low carbon high alloy steel provided by the present invention, molten steel is all molten during refining at the beginning of electric furnace/converter
The content of each element is measured after clear, empirically formula determines follow-up blowing oxygen quantity according to the content of each element later, controls molten steel
Peroxide in converting process, to prevent molten steel peroxidating.It is taken off stage by stage according to tap in electric furnace/converter tapping stage
Oxygen replaces the aluminium of higher cost using lower-cost carbon dust part, and the dosage of aluminium is reduced while deoxidation is reached, up to
To reducing cost, while reduce Al in steel under the premise of similary deoxidation effect2O3The amount and total oxygen content of field trash.In steel
According to the aluminum steel of oxygen content feeding respective numbers free in molten steel when liquid refining is in place；Constantly using diffusion during LF refining
The mode deoxidation of deoxidation.During VD/RH is refined, for the time that increase field trash fully floats, Calcium treatment is carried out before VD；VD
Final deoxidizing, whole desulfurization and the operation of final inclusions class are carried out after processing by the way of rare earth treatment.During soft blow,
Soft blow processing is carried out so that the field trash in molten steel fully floats to molten steel by controlling soft blow time and soft blow intensity.In mould
During casting/continuous casting, secondary oxidation in molten steel casting process is avoided to be reduced in molten steel to reach using measures such as argon gas protections
The purpose that oxygen and oxide are mingled with.The present invention passes through refining, LF refining, VD/RH refinings, soft blow, molding/company at the beginning of electric furnace/converter
It casts each period in/stage, using the integrated use of multiple technologies means, abundant deoxidation can be reached, reduce each type impurity grade
Not, finally make the total oxygen content TO stability contortings of low carbon high alloy steel no more than 15 μ g/g, A classes and C type impurities（Thick system and
Thin system）Rank is no more than 1.0 grades, B classes and D type impurities（Thick system and thin system）Rank is no more than 1.5 grades；Ds type impurity grades
It Bu great Yu not be 1.5 grades；Each type impurity summation is not more than 3.5 grades.
Therefore, the present invention has the deoxidation effect that can significantly improve low carbon high alloy steel, effectively removes low carbon high alloy
The field trash of steel significantly reduces entire oxygen content in the steel content and inclusion behavior, improves the good effect of the degree of purity of steel.
Description of the drawings
Attached drawing part discloses the specific embodiment of the invention, wherein,
Fig. 1, P91 steel A classes are carefully the distribution map of field trash；
Fig. 2, P91 steel B classes are carefully the distribution map of field trash；
Fig. 3, P91 steel C classes are carefully the distribution map of field trash；
Fig. 4, P91 steel D classes are carefully the distribution map of field trash；
Fig. 5, P91 steel Ds classes are carefully the distribution map of field trash；
The distribution map of each type impurity summation of Fig. 6, P91 steel；
Fig. 7, P91 steel total oxygen content distribution map；
Fig. 8, P91 steel bending strength figure；
Fig. 9, P91 steel tensile strength figure；
Figure 10, P91 steel impact toughness at room temperature figure；
Figure 11, P92 steel A classes are carefully the distribution map of field trash；
Figure 12, P92 steel B classes are carefully the distribution map of field trash；
Figure 13, P92 steel C classes are carefully the distribution map of field trash；
Figure 14, P92 steel D are carefully the distribution map of field trash；
The distribution map of each type impurity summation of Figure 15, P92 steel；
Figure 16, P92 steel total oxygen content distribution map；
Figure 17, P92 steel bending strength and tensile strength figure；
Figure 18, P92 the steel contraction percentage of area and elongation percentage figure；
Figure 19, P92 steel impact flexibility figure.
Specific embodiment
Below by embodiment, the present invention will be further described.
Embodiment one：
In the present embodiment, low carbon high alloy steel selects P91 steel, has selected 377 respectively, 800 low carbon high alloy steels carry out
Purity and performance index experiment.Low carbon high alloy steel use " refining → LF refining at the beginning of electric furnace/converter → VD/RH refinings → soft blow →
The technique of molding/continuous casting " carries out sublimate processing, and molten steel amount is 50 tons.
（1）Sublimate during electric furnace/converter：According to the change of each element in melting down rear molten steel after electric furnace/converter melting down phase
Theoretical blowing oxygen quantity needed for the follow-up blowing of point formulation is studied, to prevent the extent of peroxidation of molten steel；In electric furnace/converter tapping mistake
Deoxidation products Al in molten steel is reduced using carbon dust pre-deoxidation and aluminium ball precipitation desoxydation in journey2O3Content.
In electric furnace/converter smelting process, after furnace charge is melting down, the chemical composition of each element is measured by sampling.Rule of thumb
Formula calculates theoretical blowing oxygen quantity to prevent Molten Steel over-oxidation.After theoretical oxygen demand has consumed, sampling analysis molten steel chemical composition.Work as steel
[C] in liquid between 0.04%~0.05%, [P]≤0.05%, temperature electric furnace steel tapping when between 1680 DEG C~1700 DEG C.
（2）Sublimate during LF refining：When the refining of LF stoves is in place according to [O] content feeding respective numbers in molten steel
Aluminum steel carries out deoxidation；It is whole during LF refining to use diffusive deoxidation so as to while deoxygenation of liquid steel is reached, eliminate or reduce
Deoxidation products enters the quantity of molten steel.
When electric furnace steel tapping amount is at 2 tons or so, the carbon dust that 30kg is added in into molten steel carries out carbon dust pre-deoxidation；When electric furnace goes out
During 5 tons or so of steel, the aluminium ball that 70kg is added in molten steel carries out precipitation desoxydation；When 10 tons or so of electric furnace steel tapping, pressed into molten steel
According to the lower limit addition silicon of silicon, manganese content as defined in national standard, professional standard, international standard or technical conditions or technical conditions
The alloys such as iron, ferromanganese carry out deoxidation alloying operation.The addition of alloy is added according to the lower limit of ingredient specification, while is added in white
The slag making materials such as ash, refining slag.
It is such as provided in technical conditions, in carbon constructional quality steel, normal manganese content is 0.5%~0.8%；It is and higher containing manganese
In the structural steel of amount, amount is up to 0.7%~1.2%.When 10 tons or so of electric furnace steel tapping, pressed into carbon constructional quality steel molten steel
The lower limit of manganese content adds in manganese amount 0.5% as defined in sighting target standard or technical conditions.
As the silicon content in killed steel usually contains only 0.03%~0.07% in 0.1%~0.37%, boiling steel.Work as electric furnace
Tapping 10 tons or so when, into killed steel molten steel according to the lower limit of silicone content as defined in standard or technical conditions add in silicon amount
0.1%；Into boiling steel molten steel silicon amount 0.03% is added according to the lower limit of silicone content as defined in standard or technical conditions.
The molten steel that tapping finishes is moved into wire feeding process station, it is 190 μ g/g to measure free oxygen [O] content in molten steel,
According to the aluminum steel of oxygen content feeding 75kg free in steel, molten steel is moved into LF refining station later and carries out refining treatment.LF refining
Molten steel temperature is added in 1560 DEG C~1580 DEG C depending on molten steel temperature situation in the process and carries out making white slag operation again.Make white slag process
It is middle that slag is restored using aluminium powder, calcium carbide powder, ferrosilicon powder.Repeatedly slag specimen is taken to be observed during white slag is made, when slag face
When color is white, measure in slag（FeO）Content.
（3）Sublimate during VD/RH refinings：Calcification processing is carried out before molten steel carries out VD/RH refinings, is mingled with increasing
The time that object floats in molten steel makes it exclude molten steel as much as possible；
Rare earth treatment is carried out to molten steel after VD/RH processing, to reach further to deoxygenation of liquid steel, desulfurization and the rotten mesh being mingled with
's.
Repeatedly slag specimen is taken to be observed during white slag is made, when slag color is white, measured in slag（FeO）Contain
Amount, when（FeO）When≤0.5%, in molten steel during the μ g/g of [O]≤5, maintain to carry out Calcium treatment after white slag time 20min, specially
Molten steel is moved to the silicon-calcium wire of line feeding station feeding 200m.VD vacuum processings are carried out after feeding the silicon-calcium wire of 200m.At VD vacuum
Molten steel is removed into rare earth intermediate alloy of the VD stations using molten steel plunging press-in 7.5kg after reason（65% Ce, 35% La）.
（4）Sublimate during soft blow：Make folder by the way that molten steel soft blow time, BOTTOM ARGON BLOWING intensity and argon flow amount is controlled to reach
Sundries further fully floats and the purpose of deep deoxidation.
Molten steel is removed into rare earth intermediate alloy of the VD stations using molten steel plunging press-in 7.5kg after VD vacuum processings（65%
Ce, 35% La）Coverture is added in afterwards and carries out soft blow, and argon flow amount control is no more than 20L/min, soft blow when soft blow is handled
Time control is in 25min.
（5）Sublimate during molding/continuous casting：In molten steel casting process molten steel is avoided by the way of argon gas protection
Secondary oxidation.
Carrying out appropriate calm processing according to molten steel temperature situation after soft blow makes molten steel temperature reach 1550 DEG C~1560 DEG C
It carries out molding/continuous casting.Its technical way is to be full of argon gas into running gate system before molten steel cast, in steel in casting process
Water-coating port and feed trumpet position are protected using argon gas, make feed trumpet to the mouth of a river everywhere in argon gas guard mode so as to reach effectively every
The purpose of exhausted air prevents molten steel from generating secondary oxidation in casting process.Simultaneously shorten between the molten steel mouth of a river and feed trumpet away from
From further preventing secondary oxidation of the molten steel in casting process.
The 377 P91 steel finally measured are to be produced using the sublimate method of low carbon high alloy steel provided by the present invention
, 800 P91 steel be produce using existing sublimate method, their purity and performance index comparison is as shown in Figure 1
A classes are carefully the distribution of field trash, and the B classes as shown in Fig. 2 are carefully the distribution of field trash, and the C classes as shown in Fig. 3 are carefully field trash
Distribution, the D classes as shown in Fig. 4 are carefully the distribution of field trash, and the Ds classes as shown in Fig. 5 are carefully the distribution of field trash,
The distribution of each type impurity summation as shown in Figure 6.
By refining, LF refining, VD/RH refinings, soft blow, molding/continuous casting each period/stage at the beginning of electric furnace/converter, use
The integrated use of multiple technologies means finally makes the total oxygen content TO stability contortings of low carbon high alloy steel no more than 15 μ g/g, A
Class and C type impurities（Thick system and thin system）Rank is no more than 1.0 grades, B classes and D type impurities（Thick system and thin system）Rank is little
In 1.5 grades；Ds type impurities rank is not more than 1.5 grades；Each type impurity summation is not more than 3.5 grades.
The sublimate effect table of 1 P91 steel of table
| To(μg/g) | A classes are carefully | A classes are slightly | B classes are carefully | B classes are slightly | C classes are carefully | C classes are slightly | D classes are carefully | D classes are slightly | DS classes |
| 12 | 0.5 | 0 | 0.5 | 0 | 0.5 | 0 | 0 | 0 | 0.5 |
Further, in electric furnace/converter steelmaking process, according to needed for each element content after melting down come calculated for subsequent smelting period
Theoretical oxygen demand, calculation formula are as follows：
TOIt is theoretical=5×7.76×[15%-(Fe)Slag%]/80% +T×[(C%-0.05%)×9.307+(Mn%-0.08%)×
24.073+（Cr%-0.15%）×15.115+(P%-0.005%)×5.423]/80%
In above formula：
T is molten steel amount in molten bath（t）, according to furnace charge charge weight × 90%+ electric furnaces（Converter）Steel amount is stayed to calculate；
C%, Mn%, Cr%, P% are melting down rear sampling analysis ingredient；
15% is in slag（FeO）Equalization point；
80% is oxygen utilization rate.
Further, in electric furnace/converter tapping process, in different taps, be respectively adopted carbon dust pre-deoxidation and
The deoxidization technique of aluminium ball precipitation desoxydation：When molten steel tap reaches 2~5 ton hours, ton steel is added into molten steel is（0.4~0.6）
The carbon dust of kg/t carries out pre-deoxidation to molten steel；When tap reaches 5~8 ton hours, ton steel is added into molten steel is（1.2~1.8）
The aluminium ball of kg/t carries out precipitation desoxydation；When tap reaches after 10 tons, according to national standard, professional standard, international standard
Or the regulation in technical conditions carries out deoxidation according to lower limit addition ferrosilicon, ferromanganese etc. into molten steel and alloying operates.Add in carbon
Powder pre-deoxidation can reach the addition for being not only acted as under conditions of molten steel not carburetting and reducing aluminium costly, Er Qieke
To reach the Al for reducing and being generated by deoxidier aluminium2O3Amount, and then mitigate subsequent technique in remove Al2O3Burden.
Further, when after tapping and molten steel is after LF refining is in place, measuring free oxygen [O] content in molten steel
Afterwards, according to [O] content in steel, the aluminum steel for feeding different number carries out further deoxidation：As the μ g/ of [O] content in molten steel >=400
Ton steel is fed during g is（1.6~2.4）The aluminum steel of kg；
When [O] content exists in molten steel（200~400）During μ g/g, feeding ton steel is（0.8~1.6）The aluminum steel of kg；
When [O] content exists in molten steel（100~200）During μ g/g, feeding aluminum steel quantity is ton steel（0.6~0.8）kg；
As [O] content >=50 μ g/g in molten steel, feeding aluminum steel is ton steel（0.3~0.6）kg.
Further, molten steel of the molten steel after feeding aluminum steel deoxidation treatment is transported to LF refining station, basis after thermometric
After molten steel is heated to preference temperature by molten steel temperature situation, carry out making white slag operation.During LF refining, according to slag color
Variation, repeatedly addition aluminium powder, calcium carbide, ferrosilicon powder are diffused deoxidation, diffusion deoxidizer total amount control in batch incessantly
System is in ton steel（2~3）In the range of kg；After light current rock ballast is formed, using ferrosilicon powder deoxidation and refining temperature is improved, is destroyed weak
Carbide slag, until in slag（FeO）%≤0.5%, after the μ g/g of free oxygen content in slag≤5, alloy can be added into molten steel makes steel
Liquid alloying.
The fine tuning of the alloying component of molten steel alloying must adjust under white slag state, after having adjusted last batch of alloy,
Continue slag to be adjusted to white slag state again, and keep white slag state 20min to molten steel face addition aluminium powder, ferrosilicon powder or calcium carbide
A step calcification processing can be carried out above.
Further, alloy is completed in LF processes to adjust and maintain that molten steel is moved to line feeding after slag white slag state 20min
Station carries out calcification processing, and ton steel feeding silicon-calcium wire quantity is（3~5）During m, calcification processing is carried out, it is all kinds of in molten steel to increase
The time that field trash fully floats makes field trash enter slag exclusion, and the molten steel after calcification processing is moved to VD processing works later
Sequence carries out vacuum processing.
Further, molten steel vehicle is removed VD stations and carries out rare earth treatment, specially using molten steel by molten steel after VD is handled
Rare earth alloy is pressed into steel level 500mm hereinafter, rare earth intermediate alloy intrusion presses rare earth element concentration by the method for press-in
（30~100）μ g/g are controlled, and final deoxidizing, whole desulfurization and whole inclusions class are carried out to molten steel.
Further, the molten steel Jing Guo rare earth treatment is added in coverture, carried out at soft blow by molten steel after rare earth treatment
Reason, according to molten steel capacity and Metal Weight, adjusting argon bottom-blowing intensity and flow makes slag be in slight flow shape for soft blow processing
Without exposed, the flowing velocity of argon gas is 0.05~0.1m/s for state and molten steel face, molten steel soft blow time control in more than 20min, with
Field trash in molten steel is promoted fully to float into slag.
Further, molten steel prevents the secondary oxidation of molten steel in casting process, and technical way is poured in molten steel
Argon gas is full of before note into running gate system, is protected in casting process in ladle nozzle and feed trumpet position using argon gas, makes middle note
Pipe is to the mouth of a river everywhere in argon gas guard mode so as to achieve the purpose that effectively completely cutting off air prevents molten steel from being generated in casting process
Secondary oxidation.It is secondary come further prevent molten steel in casting process to shorten the distance between the molten steel mouth of a river and feed trumpet simultaneously
Oxidation.
Using the sublimate method of low carbon high alloy steel provided by the present invention, total oxygen of 377 P91 low carbon high alloy steels
The performance indicators such as content, bending strength, tensile strength, impact toughness at room temperature can be up to state standards, professional standard, international mark
Accurate or technical conditions requirements, the every specific performance index test total oxygen content that the results are shown in Figure 7 distribution, such as Fig. 8 institutes
The bending strength shown, tensile strength as shown in Figure 9, impact toughness at room temperature as shown in Figure 10.
Embodiment two：
In the present embodiment, low carbon high alloy steel selects P92 steel, and 38 low carbon high alloy steels has been selected to carry out purity and property respectively
It can index tests.Low carbon high alloy steel is using " electric furnace/converter → LF refining → VD/RH refinings → soft blow → molding/continuous casting "
Technique carries out sublimate processing, and molten steel amount is 50 tons.
（1）Sublimate during electric furnace/converter：According to the change of each element in melting down rear molten steel after electric furnace/converter melting down phase
Theoretical blowing oxygen quantity needed for the follow-up blowing of point formulation is studied, to prevent the extent of peroxidation of molten steel；In electric furnace/converter tapping mistake
Deoxidation products Al in molten steel is reduced using carbon dust pre-deoxidation and aluminium ball precipitation desoxydation in journey2O3Content.
In electric furnace/converter smelting process, after furnace charge is melting down, the chemical composition of each element is measured by sampling.Rule of thumb
Formula calculates theoretical blowing oxygen quantity to prevent Molten Steel over-oxidation.After theoretical oxygen demand has consumed, sampling analysis molten steel chemical composition.Work as steel
[C] in liquid between 0.04%~0.05%, [P]≤0.05%, temperature electric furnace steel tapping when between 1685 DEG C~13950 DEG C.
（2）Sublimate during LF refining：When the refining of LF stoves is in place according to [O] content feeding respective numbers in molten steel
Aluminum steel carries out deoxidation；It is whole during LF refining to use diffusive deoxidation so as to while deoxygenation of liquid steel is reached, eliminate or reduce
Deoxidation products enters the quantity of molten steel.
When electric furnace steel tapping amount is at 2 tons or so, the carbon dust that 28kg is added in into molten steel carries out carbon dust pre-deoxidation；When electric furnace goes out
During 5 tons or so of steel, the aluminium ball that 68kg is added in molten steel carries out precipitation desoxydation；When 10 tons or so of electric furnace steel tapping, pressed into molten steel
According to the lower limit addition silicon of silicon, manganese content as defined in national standard, professional standard, international standard or technical conditions or technical conditions
The alloys such as iron, ferromanganese carry out deoxidation alloying operation.The addition of alloy is added according to the lower limit of ingredient specification, while is added in white
The slag making materials such as ash, refining slag.
The molten steel that tapping finishes is moved into wire feeding process station, it is 195 μ g/g to measure free oxygen [O] content in molten steel,
According to the aluminum steel of oxygen content feeding 76kg free in steel, molten steel is moved into LF refining station later and carries out refining treatment.LF refining
Molten steel temperature is added in 1565 DEG C~1575 DEG C depending on molten steel temperature situation in the process and carries out making white slag operation again.Make white slag process
It is middle that slag is restored using aluminium powder, calcium carbide powder, ferrosilicon powder.Repeatedly slag specimen is taken to be observed during white slag is made, when slag face
When color is white, measure in slag（FeO）Content.
（3）Sublimate during VD/RH refinings：Calcification processing is carried out before molten steel carries out VD/RH refinings, is mingled with increasing
The time that object floats in molten steel makes it exclude molten steel as much as possible；
Rare earth treatment is carried out to molten steel after VD/RH processing, to reach further to deoxygenation of liquid steel, desulfurization and the rotten mesh being mingled with
's.
Repeatedly slag specimen is taken to be observed during white slag is made, when slag color is white, measured in slag（FeO）Contain
Amount, when（FeO）When≤0.5%, in molten steel during the μ g/g of [O]≤4, maintain to carry out Calcium treatment after white slag time 20min, specially
Molten steel is moved to the silicon-calcium wire of line feeding station feeding 200m.VD vacuum processings are carried out after feeding the silicon-calcium wire of 200m.At VD vacuum
Molten steel is removed into rare earth intermediate alloy of the VD stations using molten steel plunging press-in 7.6kg after reason（65% Ce, 35% La）.
（4）Sublimate during soft blow：Make folder by the way that molten steel soft blow time, BOTTOM ARGON BLOWING intensity and argon flow amount is controlled to reach
Sundries further fully floats and the purpose of deep deoxidation.
Molten steel is removed into rare earth alloy of the VD stations using molten steel plunging press-in 7.6kg after VD vacuum processings（65%
Ce, 35% La）Coverture is added in afterwards and carries out soft blow, and argon flow amount control is no more than 20L/min when soft blow is handled, during soft blow
Between control in 22min.
（5）Sublimate during molding/continuous casting：In molten steel casting process molten steel is avoided by the way of argon gas protection
Secondary oxidation.
Carrying out appropriate calm processing according to molten steel temperature situation after soft blow makes molten steel temperature reach 1552 DEG C~1558 DEG C
It carries out molding/continuous casting.Its technical way is to be full of argon gas into running gate system before molten steel cast, in steel in casting process
Water-coating port and feed trumpet position are protected using argon gas, make feed trumpet to the mouth of a river everywhere in argon gas guard mode so as to reach effectively every
The purpose of exhausted air prevents molten steel from generating secondary oxidation in casting process.Simultaneously shorten between the molten steel mouth of a river and feed trumpet away from
From further preventing secondary oxidation of the molten steel in casting process.
38 low carbon high alloy steels finally measured are the sublimate side using low carbon high alloy steel provided by the present invention
Method production, purity and performance index A classes as shown in figure 11 are carefully the distribution of field trash, and B classes as shown in figure 12 are carefully
The distribution of field trash, C classes are carefully the distribution of field trash as shown in fig. 13 that, and D as shown in figure 14 is carefully the distribution of field trash, such as
The distribution of each type impurity summation shown in figure 15.
By the way that in electric furnace/converter, LF refining, VD/RH refinings, soft blow, molding/continuous casting each period/stage, use is a variety of
The integrated use of technological means, finally make the total oxygen content TO stability contortings of low carbon high alloy steel no more than 20 μ g/g, A classes and
C type impurities（Thick system and thin system）Rank is no more than 1.0 grades, B classes and D type impurities（Thick system and thin system）Rank no more than
1.5 grade；Ds type impurities rank is not more than 1.5 grades；Each type impurity summation is not more than 3.5 grades.
The sublimate effect table of 2 P92 steel of table
| To(μg/g) | A is carefully | A is slightly | B is carefully | B is slightly | C is carefully | C is slightly | D is carefully | D is slightly | DS |
| 12 | 0.5 | 0 | 0.5 | 0 | 0.5 | 0 | 0 | 0 | 0.5 |
Further, in electric furnace/converter steelmaking process, according to needed for each element content after melting down come calculated for subsequent smelting period
Theoretical oxygen demand, calculation formula are as follows：
TOIt is theoretical=5×7.76×[15%-(Fe)Slag%]/80% +T×[(C%-0.05%)×9.307+(Mn%-0.08%)×
24.073+（Cr%-0.15%）×15.115+(P%-0.005%)×5.423]/80%
In above formula：
T is molten steel amount in molten bath（t）, according to furnace charge charge weight × 90%+ electric furnaces（Converter）Steel amount is stayed to calculate；
C%, Mn%, Cr%, P% are melting down rear sampling analysis ingredient；
15% is in slag（FeO）Equalization point；
80% is oxygen utilization rate.
Further, in electric furnace/converter tapping process, in different taps, be respectively adopted carbon dust pre-deoxidation and
The deoxidization technique of aluminium ball precipitation desoxydation：When molten steel tap reaches 2~5 ton hours, ton steel is added into molten steel is（0.45~
0.55）The carbon dust of kg/t carries out pre-deoxidation to molten steel；When tap reaches 5~8 ton hours, ton steel is added into molten steel is（1.3~
1.6）The aluminium ball of kg/t carries out precipitation desoxydation；When tap reaches after 10 tons, according to national standard, professional standard, the world
Regulation in standard or technical conditions carries out deoxidation according to lower limit addition ferrosilicon, ferromanganese etc. into molten steel and alloying operates.Add
Enter carbon dust pre-deoxidation, the addition for being not only acted as under conditions of molten steel not carburetting and reducing aluminium costly can be reached, and
And the Al for reducing and being generated by deoxidier aluminium can be reached2O3Amount, and then mitigate subsequent technique in remove Al2O3Burden.
Further, when after tapping and molten steel is after LF refining is in place, measuring free oxygen [O] content in molten steel
Afterwards, according to [O] content in steel, the aluminum steel for feeding different number carries out further deoxidation：As the μ g/ of [O] content in molten steel >=400
Ton steel is fed during g is（1.8~2.2）The aluminum steel of kg；
When [O] content exists in molten steel（200~400）During μ g/g, feeding ton steel is（1.0~1.4）The aluminum steel of kg；
When [O] content exists in molten steel（100~200）During μ g/g, feeding aluminum steel quantity is ton steel（0.65~0.75）kg；
As [O] content >=50 μ g/g in molten steel, feeding aluminum steel is ton steel（0.4~0.5）kg.
Further, molten steel of the molten steel after feeding aluminum steel deoxidation treatment is transported to LF refining station, basis after thermometric
After molten steel is heated to preference temperature by molten steel temperature situation, carry out making white slag operation.During LF refining, according to slag color
Variation, repeatedly addition aluminium powder, calcium carbide, ferrosilicon powder are diffused deoxidation, diffusion deoxidizer total amount control in batch incessantly
System is in ton steel（2.2~2.8）In the range of kg；After light current rock ballast is formed, using ferrosilicon powder deoxidation and refining temperature is improved, is broken
Bad light current rock ballast, until in slag（FeO）%≤0.5% after the μ g/g of free oxygen content in slag≤5, can add alloy into molten steel
Make molten steel alloying.
The fine tuning of the alloying component of molten steel alloying must adjust under white slag state, after having adjusted last batch of alloy,
Continue slag to be adjusted to white slag state again, and keep white slag state 20min to molten steel face addition aluminium powder, ferrosilicon powder or calcium carbide
A step calcification processing can be carried out above.
Further, alloy is completed in LF processes to adjust and maintain that molten steel is moved to line feeding after slag white slag state 22min
Station carries out calcification processing, and ton steel feeding silicon-calcium wire quantity is（3.5~4.5）During m, calcification processing is carried out, to increase in molten steel
The time that each type impurity fully floats makes field trash enter slag exclusion, later moves to the molten steel after calcification processing at VD
Science and engineering sequence carries out vacuum processing.
Further, molten steel vehicle is removed VD stations and carries out rare earth treatment, specially using molten steel by molten steel after VD is handled
Rare earth alloy is pressed into steel level 500mm hereinafter, rare earth intermediate alloy intrusion presses rare earth element concentration by the method for press-in
（50~80）μ g/g are controlled, and final deoxidizing, whole desulfurization and whole inclusions class are carried out to molten steel.
Further, the molten steel Jing Guo rare earth treatment is added in coverture, carried out at soft blow by molten steel after rare earth treatment
Reason, according to molten steel capacity and Metal Weight, adjusting argon bottom-blowing intensity and flow makes slag be in slight flow shape for soft blow processing
Without exposed, the flowing velocity of argon gas is 0.06~0.08m/s for state and molten steel face, molten steel soft blow time control in more than 22min, with
Field trash in molten steel is promoted fully to float into slag.
Further, molten steel prevents the secondary oxidation of molten steel in casting process, and technical way is poured in molten steel
Argon gas is full of before note into running gate system, is protected in casting process in ladle nozzle and feed trumpet position using argon gas, makes middle note
Pipe is to the mouth of a river everywhere in argon gas guard mode so as to achieve the purpose that effectively completely cutting off air prevents molten steel from being generated in casting process
Secondary oxidation.It is secondary come further prevent molten steel in casting process to shorten the distance between the molten steel mouth of a river and feed trumpet simultaneously
Oxidation.
Using the sublimate method of low carbon high alloy steel provided by the present invention, total oxygen of 38 P92 low carbon high alloy steels
The performance indicators such as content, bending strength, tensile strength, the contraction percentage of area and elongation percentage, impact toughness at room temperature can reach country
The requirement of standard, professional standard, international standard or technical conditions, every specific performance index test result is as shown in Figure 16
Total oxygen content distribution, bending strength and tensile strength as shown in Figure 17, the contraction percentage of area as shown in figure 18 and extension
Rate, the impact flexibility as shown in Figure 19.
Claims (10)
1. a kind of sublimate method of low carbon high alloy steel, which is characterized in that include the following steps：
（1）Sublimate during electric furnace/converter just refining
It is theoretical according to needed for the chemical composition of each element in melting down rear molten steel formulates follow-up blowing after electric furnace/converter is melting down
Blowing oxygen quantity prevents the extent of peroxidation of molten steel；
Deoxidation products Al in molten steel is reduced using carbon dust pre-deoxidation and aluminium ball precipitation desoxydation in electric furnace/converter tapping process2O3
Content；
（2）Sublimate during LF refining
When the refining of LF stoves is in place, deep deoxidation is carried out according to [O] content feeding aluminum steel in molten steel；
It is whole using diffusive deoxidation during LF refining, while deoxygenation of liquid steel is reached, eliminate or reduce the deoxidation in molten steel
Product enters the quantity of molten steel；
（3）Sublimate during VD/RH refinings
Calcification processing is carried out before molten steel carries out VD/RH refinings, to increase the time that field trash floats in molten steel；
Rare earth treatment is carried out to molten steel after VD/RH processing, to reach further to deoxygenation of liquid steel, desulfurization and rotten field trash
Purpose；
（4）Sublimate during soft blow
Being reached by the soft blow time, BOTTOM ARGON BLOWING intensity and the argon flow amount that control molten steel makes field trash further fully float and deep
The purpose of deoxidation；
（5）Sublimate during molding/continuous casting
In molten steel casting process the secondary oxidation of molten steel is avoided by the way of argon gas protection.
2. the sublimate method of low carbon high alloy steel according to claim 1, which is characterized in that（1）At the beginning of electric furnace/converter
In sublimate during refining, after electric furnace/converter is melting down, follow-up blowing is formulated according to the chemical composition of each element in melting down rear molten steel
Needed for theoretical blowing oxygen quantity, calculation formula is as follows：
TOIt is theoretical=5×7.76×[15%-(Fe)Slag%]/80% +T×[(C%-0.05%)×9.307+(Mn%-0.08%)×
24.073+（Cr%-0.15%）×15.115+(P%-0.005%)×5.423]/80%
In above formula：
T is molten steel amount in molten bath（t）, steel amount is stayed to calculate according to furnace charge charge weight × 90%+ electric furnaces/converter；
C%, Mn%, Cr%, P% are melting down rear sampling analysis ingredient；
15% is in slag（FeO）Equalization point；
80% is oxygen utilization rate.
3. the sublimate method of low carbon high alloy steel according to claim 1, which is characterized in that（1）Electric furnace/converter is just refined
In the sublimate of period, reduced in molten steel using carbon dust pre-deoxidation and aluminium ball precipitation desoxydation in electric furnace/converter tapping process
Deoxidation products Al2O3Content：When molten steel tap reaches 2~5 ton hours, ton steel is added into molten steel is（0.4~0.6）kg/t
Carbon dust to molten steel carry out pre-deoxidation；When tap reaches 5~8 ton hours, ton steel is added into molten steel is（1.2~1.8）kg/t
Aluminium ball carry out precipitation desoxydation；When tap reaches after 10 tons, ferrosilicon is added into molten steel, ferromanganese carries out deoxidation and alloy
Change operation.
4. the sublimate method of low carbon high alloy steel according to claim 1, which is characterized in that（2）During LF refining
Sublimate in, LF stoves refining it is in place when, according in molten steel [O] content feeding aluminum steel carry out deep deoxidation：
Ton steel is fed as [O] content >=400 μ g/g in molten steel is（1.6~2.4）The aluminum steel of kg；
When [O] content exists in molten steel（200~400）During μ g/g, feeding ton steel is（0.8~1.6）The aluminum steel of kg；
When [O] content exists in molten steel（100~200）During μ g/g, feeding aluminum steel quantity is ton steel（0.6~0.8）kg；
As [O] content >=50 μ g/g in molten steel, the amount for feeding aluminum steel is ton steel（0.3~0.6）kg.
5. the sublimate method of low carbon high alloy steel according to claim 1, which is characterized in that（2）During LF refining
Sublimate in, during LF refining, according to the variation of slag color, add aluminium powder, calcium carbide, silicon in batch incessantly
Iron powder is diffused deoxidation, and diffusion deoxidizer overall control is in ton steel（2~3）In the range of kg；After light current rock ballast is formed, adopt
With ferrosilicon powder deoxidation and refining temperature is improved, destroys light current rock ballast, until in slag（FeO）%≤0.5%, free oxygen content in slag≤
After 5 μ g/g, alloy can be added into molten steel makes molten steel alloying；
The fine tuning of the alloying component of molten steel alloying must adjust under white slag state, after having adjusted last batch of alloy, continue
Aluminium powder, ferrosilicon powder or calcium carbide, which are added in, to molten steel face slag is adjusted to white slag state again, and keep more than white slag state 20min
It can carry out a step calcification processing.
6. the sublimate method of low carbon high alloy steel according to claim 1, which is characterized in that（3）VD/RH refining periods
Between sublimate in, molten steel carry out VD/RH refining before carry out calcification processing：
After LF processes completion alloy adjusts and maintains slag white slag state 20min, molten steel is moved into line feeding station and carries out calcification
Processing, ton steel feeding silicon-calcium wire quantity are（3~5）During m, carry out calcification processing, with increase in molten steel each type impurity fully on
The floating time makes field trash enter slag exclusion, and the molten steel after calcification processing is moved to VD treatment process later carries out at vacuum
Reason.
7. the sublimate method of low carbon high alloy steel according to claim 1, which is characterized in that（3）VD/RH refining periods
Between sublimate in, VD/RH processing after to molten steel carry out rare earth treatment：
Molten steel removes VD stations after VD is handled, by buggy ladle and carries out rare earth treatment, and the method being specially pressed into using molten steel will
Rare earth intermediate alloy is pressed into steel level 500mm hereinafter, rare earth intermediate alloy intrusion is a concentration of by pure rare earth（30~100）
μ g/g are controlled, to realize the final deoxidizing of RE Elements on Steel liquid, whole desulfurization and whole inclusions class.
8. the sublimate method of low carbon high alloy steel according to claim 1, which is characterized in that（4）During soft blow
In sublimate, reached by the soft blow time, BOTTOM ARGON BLOWING intensity and the argon flow amount that control molten steel make field trash further fully on
Floating and deep deoxidation purpose, according to Metal Weight, adjusting argon bottom-blowing intensity and flow makes slag be in flowing shape for soft blow processing
State and molten steel face are without exposed, and molten steel soft blow time control is in more than 20min.
9. the sublimate method of low carbon high alloy steel according to claim 1, which is characterized in that（5）Molding/continuous casting phase
Between sublimate in, avoid the secondary oxidation of molten steel, main skill by the way of argon gas protection in molten steel casting process
Art means are to be full of argon gas into running gate system before molten steel cast, are used in casting process in ladle nozzle and feed trumpet position
Argon gas is protected, and makes feed trumpet to the mouth of a river everywhere in argon gas guard mode, while shorten the distance between the molten steel mouth of a river and feed trumpet.
10. the sublimate method of low carbon high alloy steel according to claim 8, which is characterized in that adjustment argon bottom-blowing is strong
Degree and flow make slag be in flow regime, and flowing velocity is 0.05~0.1m/s.
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| CN109385505A (en) * | 2018-09-25 | 2019-02-26 | 北京科技大学 | A kind of method that vacuum control obtains reproducibility high alkalinity white slag in VD furnace |
| CN109055852A (en) * | 2018-10-22 | 2018-12-21 | 成都先进金属材料产业技术研究院有限公司 | Cold work die steel inclusion control method |
| CN109055852B (en) * | 2018-10-22 | 2021-03-23 | 成都先进金属材料产业技术研究院有限公司 | Control method for inclusions in cold-work die steel |
| CN109880966A (en) * | 2019-02-26 | 2019-06-14 | 舞阳钢铁有限责任公司 | A kind of smelting process of large-sized forging ingot S35C steel |
| CN111593252A (en) * | 2020-06-30 | 2020-08-28 | 新余钢铁股份有限公司 | Smelting method of rare earth steel |
| CN113145807A (en) * | 2021-04-27 | 2021-07-23 | 建龙北满特殊钢有限责任公司 | Rare earth bearing steel ingot for shield machine and production method thereof |
| CN113355482A (en) * | 2021-08-09 | 2021-09-07 | 北京科技大学 | Preparation method of P92 steel for refining inclusions by Al-Ca composite stranded wire |
| CN114058767A (en) * | 2021-11-15 | 2022-02-18 | 东北大学 | Method for refining rare earth inclusions in super stainless steel |
| CN114058767B (en) * | 2021-11-15 | 2022-09-09 | 东北大学 | Method for refining rare earth inclusions in super stainless steel |
| CN114606428A (en) * | 2022-02-20 | 2022-06-10 | 山西太钢不锈钢股份有限公司 | Method for refining, reducing and smelting low-silicon low-aluminum high-pressure boiler tube blank P91 |
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