CN106609313B - A kind of high-purity rare earth steel processing method - Google Patents
A kind of high-purity rare earth steel processing method Download PDFInfo
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- CN106609313B CN106609313B CN201710059980.6A CN201710059980A CN106609313B CN 106609313 B CN106609313 B CN 106609313B CN 201710059980 A CN201710059980 A CN 201710059980A CN 106609313 B CN106609313 B CN 106609313B
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- 229910052761 rare earth metal Inorganic materials 0.000 title claims abstract description 97
- 150000002910 rare earth metals Chemical class 0.000 title claims abstract description 94
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 81
- 239000010959 steel Substances 0.000 title claims abstract description 81
- 238000003672 processing method Methods 0.000 title claims abstract description 19
- 238000007670 refining Methods 0.000 claims abstract description 61
- 238000000034 method Methods 0.000 claims abstract description 52
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 47
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 46
- 239000001301 oxygen Substances 0.000 claims abstract description 46
- 239000002893 slag Substances 0.000 claims abstract description 24
- 238000009749 continuous casting Methods 0.000 claims abstract description 20
- 230000000694 effects Effects 0.000 claims abstract description 18
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000000465 moulding Methods 0.000 claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 10
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000000746 purification Methods 0.000 claims abstract description 8
- 239000007788 liquid Substances 0.000 claims abstract description 7
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 7
- 239000011593 sulfur Substances 0.000 claims abstract description 7
- WMOHXRDWCVHXGS-UHFFFAOYSA-N [La].[Ce] Chemical compound [La].[Ce] WMOHXRDWCVHXGS-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910052681 coesite Inorganic materials 0.000 claims abstract description 6
- 229910052906 cristobalite Inorganic materials 0.000 claims abstract description 6
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 6
- 229910052682 stishovite Inorganic materials 0.000 claims abstract description 6
- 229910052905 tridymite Inorganic materials 0.000 claims abstract description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 8
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 6
- 229910052684 Cerium Inorganic materials 0.000 claims description 6
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 6
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 claims description 6
- 229910052746 lanthanum Inorganic materials 0.000 claims description 6
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 claims description 6
- 238000006477 desulfuration reaction Methods 0.000 claims description 4
- 230000023556 desulfurization Effects 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 230000003647 oxidation Effects 0.000 claims description 4
- 238000007254 oxidation reaction Methods 0.000 claims description 4
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical compound S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 claims description 4
- 229910052786 argon Inorganic materials 0.000 claims description 3
- 238000005260 corrosion Methods 0.000 claims description 3
- 230000007797 corrosion Effects 0.000 claims description 3
- 238000007664 blowing Methods 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 claims description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims 1
- 239000007789 gas Substances 0.000 claims 1
- 239000011777 magnesium Substances 0.000 claims 1
- 229910052749 magnesium Inorganic materials 0.000 claims 1
- 239000000463 material Substances 0.000 claims 1
- 239000002689 soil Substances 0.000 claims 1
- 239000010813 municipal solid waste Substances 0.000 abstract description 8
- 230000003749 cleanliness Effects 0.000 abstract description 4
- 239000005864 Sulphur Substances 0.000 abstract description 2
- 230000004048 modification Effects 0.000 abstract description 2
- 238000012986 modification Methods 0.000 abstract description 2
- 239000012535 impurity Substances 0.000 description 5
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000654 additive Substances 0.000 description 3
- 230000000996 additive effect Effects 0.000 description 3
- 239000000395 magnesium oxide Substances 0.000 description 2
- 229910001122 Mischmetal Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
Classifications
-
- 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
-
- 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
-
- 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
- C21C7/10—Handling in a vacuum
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The present invention relates to molten steel sublimate process field, specially a kind of high-purity rare earth steel processing method.This method is applied in preparing in blank for " technique 1.: electric furnace/converter → LF refining → VD/RH vacuum processing → soft blow → continuous casting/molding " or " technique 2.: converter → RH application of vacuum → soft blow → continuous casting ", lanthanum cerium mixing pure rare earth specifically is added in LF refining, VD/RH are vacuum-treated or three liquid steel refinings of soft blow are handled, additional amount is then according to steel oxygen in water ODissolved oxygen, total oxygen T.O, sulfur content S and refining basicity of slag R=CaO/SiO2, FeO+MnO total content be added, reach the function and effect of rare earth purification molten steel, rotten fine foreign matter.The effects of this method is formed according to sulphur in molten steel, oxygen content and refining slag, in conjunction with refining operation technique, carries out reasonable rare earth addition, prominent RE Elements on Steel Water warfare, inclusion modification effect, promotes Molten Steel Cleanliness, and refine field trash.
Description
Technical field
The present invention relates to molten steel sublimate process field, specially a kind of high-purity rare earth steel processing method.
Background technique
Molten Steel Cleanliness control is high-quality steel for middle most essential steps, and inclusion content and inclusion size are in steel
The most important index of degree of purity.Currently, the blank of steel mainly uses: technique 1. (electric furnace/converter → LF refining → VD/RH vacuum
Processing → soft blow → continuous casting/molding) or technique 2. (converter → RH application of vacuum → soft blow → continuous casting) preparation.But since production is flowed
Journey is long, and controlling unit is more, and long-term existence inclusion content of steel is higher the problem of larger field trash, steel usually occurs with size
The case where middle total oxygen content is more than 15ppm, and field trash grade is also relatively high.Therefore, it is necessary to a kind of effective, stable molten steel
The degree of purity of purification method raising steel.And rare earth has the function and effect of deep deoxidation, modifying-refining field trash, is a kind of ideal high
Clean steel processing method.
Summary of the invention
The purpose of the present invention is to provide a kind of high-purity rare earth steel processing method, solve technique in the prior art 1. or
Entire oxygen content in the steel content is more than 15ppm when technique prepares steel billet 2., and field trash grade also relatively high technical problem.According to implementation
Technique refining process steel oxygen in water (ODissolved oxygen), total oxygen (T.O), sulfur content and refining slag ingredient, carry out reasonable rare earth and contain
Amount addition, realizes molten steel deep deoxidation, modifying-refining field trash function and effect.
The technical scheme is that
A kind of high-purity rare earth steel processing method, this method is " technique 1.: electric furnace/converter → LF refining → VD/RH vacuum
Processing → soft blow → continuous casting/molding " or preparing in blank for " technique 2.: converter → RH application of vacuum → soft blow → continuous casting " are answered
With specifically the addition lanthanum cerium mixing pure rare earth in LF refining, VD/RH are vacuum-treated or three liquid steel refinings of soft blow are handled, is added
Amount is then according to steel oxygen in water ODissolved oxygen, total oxygen T.O, sulfur content S and refining basicity of slag R=CaO/SiO2, FeO+MnO always contains
Amount is added, and reaches the function and effect of rare earth purification molten steel, rotten fine foreign matter.
The high-purity rare earth steel processing method, this method technique 1. prepare in blank in application, LF refining,
VD/RH is vacuum-treated, lanthanum cerium mixing pure rare earth is added in three liquid steel refining processing of soft blow；Wherein, the time is added in LF white slag
After formation, after FeO+MnO total content is less than 1.0%.
The high-purity rare earth steel processing method, when in LF refining station 20ppm≤T.O≤30ppm, 0.0030wt%
≤ S≤0.0050wt%, 5ppm≤ODissolved oxygen≤ 10ppm, when refining basicity of slag R >=2.5, rare earth is in LF refining station additional amount
0.05wt%~0.030%, it is 0.03wt%~0.02wt% that rare earth, which is vacuum-treated station additional amount in VD/RH, and rare earth is soft
Blowing station additional amount is 0.02wt%~0.01wt%；As LF refining station T.O≤20ppm, S≤0.0030wt%, ODissolved oxygen≤
5ppm, when refining basicity of slag R >=2.5, rare earth is 0.03wt%~0.025wt% in LF refining station additional amount, and rare earth is in VD/
RH application of vacuum station additional amount be 0.025wt%~0.02%, rare earth soft blow station additional amount be 0.02wt%~
0.01wt%.
The high-purity rare earth steel processing method, this method 2. prepares in blank in technique in application, converter molten iron needs
Desulfurization operations are carried out, then S≤0.0050wt% carries out RH application of vacuum operation；It needs to carry out deoxidation behaviour after RH application of vacuum
Make, ODissolved oxygenRare earth is added after≤10ppm, it is desirable that rare earth is added less than 5.0% in FeO+MnO total content after deoxidation operation, rare earth adds
Entering amount is 0.015wt%~0.025wt%.
The high-purity rare earth steel processing method, in mixed rare earth of lanthanum and cerium, weight ratio shared by lanthanum 15% or more,
Total oxygen content of the weight ratio shared by cerium in 50% or more, rare earth is in 200ppm or less.
The high-purity rare earth steel processing method will prevent secondary oxidation, main means in continuous casting/molding station
Be: at steel contacts, including tundish, long nozzle mainly use the preferable magnesia and zirconia refractory of resistant to corrosion, and
Tundish and long nozzle, ladle nozzle and feed trumpet junction, using closed argon gas-sealed.
The high-purity rare earth steel processing method, this method reach the work of rare earth purification molten steel, rotten fine foreign matter
With effect, refer to through rare earth treatment and rationally addition, T.O≤15ppm in final steel, through RE Modified size≤5 μm
Quantitative proportion shared by spherical oxysulfide is more than 85%.
The invention has the advantages and beneficial effects that:
1, the present invention can technique 1. (electric furnace/converter → LF refining → VD/RH vacuum processing → soft blow → continuous casting/molding)
Or 2. (converter → RH application of vacuum → soft blow → continuous casting) technique is prepared in blank and is applied, overcome the problems, such as that rare earth blocks the mouth of a river.
2, the present invention, which has, promotes Molten Steel Cleanliness function and effect, can make T.O≤15ppm in final steel, become through rare earth
Spherical oxysulfide (size≤5 μm) proportion of matter is more than 85%, effectively solves the problems, such as that steel inclusion grade is high.
Specific embodiment
In the specific implementation process, high-purity rare earth steel processing method of the present invention, this method can technique 1. (electric furnace/turn
Furnace → LF refining → VD/RH vacuum processing → soft blow → continuous casting/molding) or technique 2. (converter → RH application of vacuum → soft blow →
Continuous casting) it prepares in blank and applies, it can specifically add in three LF refining, VD/RH vacuum processing or soft blow liquid steel refinings processing
Enter.The rare earth of addition is lanthanum cerium mixing pure rare earth, and additional amount is then according to steel oxygen in water (ODissolved oxygen), total oxygen (T.O), sulfur content
(S) and refining basicity of slag (R=CaO/SiO2), FeO+MnO total content be added, reach rare earth purification molten steel, rotten thin
The function and effect of small field trash.In addition, to prevent secondary oxidation in continuous casting/molding station.
1. this method is prepared in blank in technique in application, can specifically be vacuum-treated in LF refining, VD/RH, soft blow three
It is added in liquid steel refining processing.Wherein, be added the time should after LF white slag is formed, FeO+MnO total content be less than 1.0wt% it
Afterwards.Additional amount is also contemplated that dissolved oxygen (ODissolved oxygen), total oxygen (T.O), sulfur content and refining basicity of slag (R=CaO/SiO2).Add
Enter amount and is also contemplated that dissolved oxygen (ODissolved oxygen), total oxygen (T.O), sulfur content and refining basicity of slag (R=CaO/SiO2).Specifically:
When in LF refining station 20ppm≤T.O≤30ppm, 0.0030wt%≤S≤0.0050wt%, 5ppm≤ODissolved oxygen≤ 10ppm,
When refining basicity of slag R >=2.5, rare earth exists in 0.05wt%~0.030wt% that LF refining station additional amount is molten steel amount, rare earth
VD/RH is vacuum-treated 0.03wt%~0.02wt% that station additional amount is molten steel amount, and rare earth is steel in soft blow station additional amount
0.02wt%~0.01wt% of water；As LF refining station T.O≤20ppm, S≤0.0030wt%, ODissolved oxygen≤ 5ppm, refining
When basicity of slag R >=2.5, rare earth is in 0.03wt%~0.025wt% that LF refining station additional amount is molten steel amount, and rare earth is in VD/
RH application of vacuum station additional amount is 0.025wt%~0.02wt% of molten steel amount, and rare earth is molten steel in soft blow station additional amount
0.02wt%~0.01wt% of amount.
Technique 2. in, converter molten iron need to carry out desulfurization operations, S≤0.0050wt%, then carry out RH application of vacuum behaviour
Make.It needs to carry out deoxidation operation, O after RH application of vacuumDissolved oxygenRare earth is added after≤10ppm, it is desirable that FeO+MnO total content is less than
5.0wt%, rare earth is added after deoxidation operation, and rare earth adding quantity is 0.015wt%~0.025wt% of molten steel amount.
The rare earth that this method is added is mixed rare earth of lanthanum and cerium, and lanthanum proportion should be in 15wt% or more in mischmetal
(preferably 30wt%), cerium proportion should exist in the total oxygen content in 50wt% or more (preferably 70wt%), rare earth
200ppm or less (is preferably 80ppm).
This method is described in continuous casting/molding station, to prevent secondary oxidation.At its main means, with steel contacts, including
Tundish, long nozzle mainly use the preferable magnesia and zirconia refractory of resistant to corrosion, and in tundish and long nozzle, ladle water
Mouth and feed trumpet junction, using closed argon gas-sealed.
This method reaches the function and effect of rare earth purification molten steel, rotten fine foreign matter, refers to through rare earth treatment and conjunction
Reason is added, T.O≤15ppm in final steel, and quantitative proportion shared by the spherical oxysulfide (size≤5 μm) through RE Modified is super
Cross 85%.
Below by embodiment, invention is further described in detail.
Embodiment 1
In the present embodiment, Q345E using technique 1., concrete technology be converter → LF refining → RH application of vacuum → soft blow →
Continuous casting, molten steel amount are 180 tons.After LF white slag is formed, FeO+MnO total content=0.8wt%, T.O=in LF refining station
25ppm, S=0.0042wt%, ODissolved oxygen=8ppm, refine basicity of slag R=3.2 when, respectively LF, RH, soft blow add rare earth into
3 furnace Q345E of row production.Wherein, rare earth is being 0.045wt% in LF refining station additional amount, and rare earth is in RH station additional amount
0.025wt%, rare earth are 0.018wt% in soft blow station additional amount, the result is as follows:
Effect after 1 continuous casting steel rare earth treatment of table
| Heat (batch) number | Rare earth additive amount | Finished product total oxygen content ppm | Spherical impurities quantitative proportion |
| 1-1 ﹟ | LF:0.045wt% | 14 | 85% |
| 1-2 ﹟ | RH:0.025wt% | 12 | 87% |
| 1-3 ﹟ | Soft blow: 0.018wt% | 10 | 87% |
Embodiment 2
In the present embodiment, Q345E using technique 1., concrete technology be converter → LF refining → RH application of vacuum → soft blow →
Continuous casting, molten steel amount are 180 tons.After LF white slag is formed, FeO+MnO total content=0.6wt%, T.O=in LF refining station
15ppm, S=0.0025wt%, ODissolved oxygen=5ppm, refine basicity of slag R=4.5 when, respectively LF, RH, soft blow add rare earth into
3 furnace Q345E of row production.Wherein, rare earth is 0.028wt% in LF refining station additional amount, and rare earth is in RH station additional amount
0.022wt%, rare earth are 0.015wt% in soft blow station additional amount, the result is as follows:
Effect after 2 continuous casting steel rare earth treatment of table
| Heat (batch) number | Rare earth additive amount | Finished product total oxygen content ppm | Spherical impurities quantitative proportion |
| 2-1 ﹟ | LF:0.028wt% | 12 | 86% |
| 2-2 ﹟ | RH:0.022wt% | 11 | 88% |
| 2-3 ﹟ | Soft blow: 0.015wt% | 10 | 90% |
Embodiment 3
In the present embodiment, 1. using technique, concrete technology is electric furnace → LF refining → VD vacuum processing → soft blow to 42CrMo
→ molding, molten steel amount are 80 tons.After LF white slag is formed, FeO+MnO total content=0.5wt%, T.O=in LF refining station
12ppm, S=0.0018wt%, ODissolved oxygen=4ppm, refine basicity of slag R=5.3 when, respectively LF, RH, soft blow add rare earth into
3 furnace 42CrMo of row production.Wherein, rare earth is 0.030wt% in LF refining station additional amount, and rare earth is vacuum-treated station in VD and adds
Entering amount is 0.020wt%, and rare earth is 0.015wt% in soft blow station additional amount, the result is as follows:
Table 3 molds effect after molten steel rare earth treatment
| Heat (batch) number | Rare earth additive amount | Finished product total oxygen content ppm | Spherical impurities quantitative proportion |
| 3-1 ﹟ | LF:0.030wt% | 11 | 87% |
| 3-2 ﹟ | VD:0.020wt% | 10 | 90% |
| 3-3 ﹟ | Soft blow: 0.015wt% | 9 | 90% |
Embodiment 4
In the present embodiment, 2. using technique, concrete technology is converter → RH application of vacuum → soft blow → company to low-carbon automobile steel
Casting.Before rare earth treatment, converter molten iron need to carry out desulfurization operations, then S=0.0036wt% carries out RH application of vacuum operation.?
It needs to carry out deoxidation operation, O after RH application of vacuumDissolved oxygenRare earth is added after=8ppm, it is desirable that FeO+MnO total content=3.5wt% takes off
Rare earth is added after oxygen operation, rare earth adding quantity 0.020wt%, the result is as follows:
Embodiment the result shows that, the method for the present invention is formed according to sulphur in molten steel, oxygen content and refining slag, is grasped in conjunction with refining
The effects of making technique, carrying out reasonable rare earth addition, protrude RE Elements on Steel Water warfare, inclusion modification effect, makes Molten Steel Cleanliness
It is promoted, and refines field trash.This method processing, which has, is sufficiently formed disperse spherical rare-earth type impurity effect, makes complete in steel
Oxygen content (T.O) is in 15ppm hereinafter, size in 5 μm of spherical impurities below is more than 85%.
Claims (5)
1. a kind of high-purity rare earth steel processing method, which is characterized in that this method " technique 1.: electric furnace/converter → LF refining →
VD/RH vacuum processing → soft blow → continuous casting/molding " or the preparation of " technique 2.: converter → RH application of vacuum → soft blow → continuous casting "
It is applied in blank, it is pure dilute that the mixing of lanthanum cerium specifically is added in LF refining, VD/RH are vacuum-treated or three liquid steel refinings of soft blow are handled
Soil, additional amount is then according to steel oxygen in water ODissolved oxygen, total oxygen T.O, 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；
The method is when 1. technique is applied: when LF refining station 20ppm < T.O≤30ppm, 0.0030wt% < S≤
When 0.0050wt%, 5ppm < O dissolved oxygen≤10ppm, refining basicity of slag R >=2.5, rare earth is in LF refining station additional amount
The wt % of 0.05wt%~0.030, it is 0.03wt%~0.02wt% that rare earth, which is vacuum-treated station additional amount in VD/RH, and rare earth is soft
Blowing station additional amount is 0.02wt%~0.01wt%；
As LF refining station T.O≤20ppm, S≤0.0030wt%, O dissolved oxygen≤5ppm, refining basicity of slag R >=2.5, rare earth
It is 0.03wt%~0.025wt% in LF refining station additional amount, it is 0.025wt% that rare earth, which is vacuum-treated station additional amount in VD/RH,
~0.02%, rare earth is 0.02wt%~0.01wt% in soft blow station additional amount；
The method is when 2. technique is applied: converter molten iron need to carry out desulfurization operations, then S≤0.0050wt% carries out RH vacuum
Processing operation；It needs to carry out deoxidation operation after RH application of vacuum, rare earth is added after O dissolved oxygen≤10ppm, it is desirable that FeO+MnO is total
Rare earth is added less than 5.0% in content after deoxidation operation, rare earth adding quantity is 0.015wt%~0.025wt%.
2. high-purity rare earth steel processing method according to claim 1, which is characterized in that 1. this method prepares base in technique
In application, lanthanum cerium mixing pure rare earth is added in LF refining, VD/RH are vacuum-treated, three liquid steel refinings of soft blow are handled in material；Its
In, the time is added after LF white slag is formed, after FeO+MnO total content is less than 1.0%.
3. high-purity rare earth steel processing method according to claim 1, which is characterized in that in mixed rare earth of lanthanum and cerium, lanthanum
Shared weight ratio is 15% or more, and total oxygen content of the weight ratio in 50% or more, rare earth shared by cerium is in 200ppm or less.
4. high-purity rare earth steel processing method according to claim 1, which is characterized in that in continuous casting/molding station, to prevent
Only secondary oxidation, main means are: at steel contacts, including tundish, long nozzle mainly use the preferable magnesium of resistant to corrosion
Matter and zirconia refractory, and in tundish and long nozzle, ladle nozzle and feed trumpet junction, it is close using closed argon gas
Envelope.
5. high-purity rare earth steel processing method according to claim 1, which is characterized in that this method reaches rare earth purification steel
The function and effect of water, rotten fine foreign matter refer to through rare earth treatment and rationally addition, T.O≤15ppm in final steel,
Quantitative proportion shared by spherical oxysulfide through RE Modified size≤5 μm is more than 85%.
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|---|---|---|---|---|
| CN110564914A (en) * | 2018-06-06 | 2019-12-13 | 中国科学院金属研究所 | Method for improving low-temperature impact toughness of low-alloy bainite steel by rare earth microalloying |
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