CN104894472B - Elevated oxygen level steel and its smelting process - Google Patents
Elevated oxygen level steel and its smelting process Download PDFInfo
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Abstract
The invention discloses a kind of elevated oxygen level steel and its smelting process, the percetage by weight of the elevated oxygen level steel chemical composition is：C≤0.0050%, Mn：0.10～1.00%, Si≤0.010%, P≤0.020%, S≤0.040%, Als≤0.0050%, Me：0.010～0.100%, O：0.005～0.030%, and Mn, Si, Als and Me total amount is not less than 0.15%, balance of Fe and inevitable impurity；Wherein, the Me is one or two in Nb, V, Ti, Cr.The elevated oxygen level steel is obtained by molten iron pretreatment, converter smelting, deoxidation alloying, tapping, deep Decarburising and refining, addition aluminum shot deoxidation, again alloying and continuous casting.The inventive method is obtained the total oxygen content of elevated oxygen level steel in the range of 0.005～0.030%, is less than 10% with desired value deviation, and Control for Oxygen Content is stable, processes without the need for calm, and production efficiency is high, can be used for continuous casting process production.Such shaped steel can be used to manufacture the steel plate with particular characteristic, such as glassed steel, automatic steel, high input energy welding steel etc..
Description
Technical field
The invention belongs to continuous-casting steel-making technology in metallurgical industry, and in particular to a kind of elevated oxygen level steel and its smelting process.
Background technology
Continuous casting process mainly produces killed steel, need Oxygen Content in Liquid Steel more low better (general Oxygen Content in Liquid Steel 20ppm with
Under), to ensure that product has high cleanliness and without air blister defect.And some steel need molten steel to have higher oxygen content,
For example, in automatic steel, the formation of I class MnS needs 100～300ppm oxygen content, needs a large amount of oxides to be mingled with and come in glassed steel
Fish scaling resistance is improved, dissolved oxygen separates out nano-scale oxide in rapid solidification and the performance for improving steel is had in thin strap continuous casting
Profit etc..The Chinese invention patent of Application No. 02809296.1,201410337333.3,200910062937.0 is each provided
Elevated oxygen level steel plate sulphur free-cutting steel, glassed steel, large heat input welding pipeline steel application example, the oxygen of its light plate contains
Amount is followed successively by 0.0015～0.0150%, 0.010～0.050%, 0.0015～0.0030%, but all smelts without reference to steel
Method and control measure.The Chinese invention patent of Application No. 201110242022.5 discloses a kind of production finer wire high-carbon
Low-alloy steel wire rod and its manufacture method, describe detailed method of deoxidation and Composition Control measure, but oxygen content are only reached
0.0010～0.0030%, it is not suitable for the smelting of more elevated oxygen level steel.
Cause molten steel to seethe with excitement as elevated oxygen level steel discharges a large amount of gases in casting cycle, be unfavorable for steady production.For
This problem is solved, in prior art, on the one hand can be produced using die casting method, but low production efficiency, and strand is easily produced
The problems such as uneven microstructure, impurity are many；On the other hand molten steel oxygen content can be reduced and mitigates boiling, general Control for Oxygen Content exists
Below 50ppm, but sheet steel sections performance requirement can not be reached, while also there is a problem of that Control for Oxygen Content scope is unstable.Cause
This, needs to develop and a kind of stablizes controlled smelting process suitable for continuous casting, oxygen content.
Content of the invention
Present invention aim to address the deficiencies in the prior art, provide a kind of elevated oxygen level steel and its smelting process.Using
The smelting process is obtained the total oxygen content control of steel in the range of 0.005～0.030%, is less than 10% with desired value deviation,
And Control for Oxygen Content is stable, can be used for continuous casting process production.
For achieving the above object, the elevated oxygen level steel designed by the present invention, the percetage by weight of its chemical composition is：C≤
0.0050%th, Mn：0.10～1.00%, Si≤0.010%, P≤0.020%, S≤0.040%, Als≤0.0050%, Me：
0.010～0.100%, O：0.005～0.030%, and Mn, Si, Als and Me total amount is not less than 0.15%, balance of Fe and not
Evitable impurity；Wherein, the Me is one or two in Nb, V, Ti, Cr.
Preferably, the percetage by weight of the elevated oxygen level steel chemical composition is：C：0.0007～0.0050%,
Mn：0.10～0.50%, Si：0.004～0.010%, P：0.010～0.020%, S：0.008～0.040%, Als：
0.0040～0.0050%, Me：0.030～0.090%, O：0.020～0.030%, and Mn, Si, Als and Me total amount is not less than
0.15%, balance of Fe and inevitable impurity；Wherein, the Me is one or two in Nb, V, Ti, Cr.
Used as more preferably scheme, the percetage by weight of the elevated oxygen level steel chemical composition is：C：0.0008%th, Mn：
0.25%th, Si：0.005%th, P：0.015%th, S：0.009%th, Als：0.0045%th, Nb：0.031%th, Ti：0.052%th, O：
0.0290%.
The smelting process of above-mentioned elevated oxygen level steel, it is by molten iron pretreatment, converter smelting, deoxidation alloying, tapping, depth
Decarburising and refining, addition aluminum shot deoxidation, again alloying and continuous casting obtain elevated oxygen level steel, and the method comprises the steps：
1) molten iron pretreatment：Slough S and P；
2) converter smelting：By step 1) in pretreated molten iron inject converter smelting, converter smelting endpoint C content is
0.03～0.04%；
3) deoxidation alloying：To step 2) in add mid-carbon fe-mn deoxidation alloying, terminal O content be 0.05～
0.07%；
4) tap：Tapping temperature be 1700～1730 DEG C, it is ensured that molten steel be weak fluidized state, basicity of slag be 3.0～
4.0, slag-stopping tapping, thickness of slag layer≤100mm；Under the conditions of elevated oxygen level, molten steel is fluidized state, too high oxygen level, boiling
Continuous casting acutely cannot be used for, and the too low molten steel of oxygen content is in sedation, is unfavorable for the generation of benefit materials in steel again；
5) deep Decarburising and refining：Deep Decarburising and refining is carried out in RH purifier, and molten steel reaches oxygen decarburization after vacuum station, very
Reciprocal of duty cycle maintains below 50Pa, processes 15～20min, and deep Decarburising and refining terminal C content reaches less than 0.0030%；
6) aluminum shot deoxidation is added：Take step 5) the steel water determination ladle chemistry that obtains, molten steel oxygen is determined with oxygen rifle
Content W1, according to molten steel total amount Ms, Oxygen Content in Liquid Steel W1With steel plate target total oxygen content W2Calculate aluminum shot addition MAl, its calculating
Formula is：
MAl=k × (W1- 0.7 × W2)×Ms
Wherein, MAlUnit is kg, W1And W2It is ton that unit is ppm, Ms unit；K is deoxygenation coefficient, and value is 0.0015；
7) alloying again：After adding aluminum shot deoxidation, 2～3min of vacuum cycle, sequentially add required alloy, then alloying
After the completion of 5～8min of vacuum cycle again, plus thermal-insulating covering agent；In the alloying process again, yield of alloy is received by killed steel
Rate deducts 10～15% calculating；
8) by step 7) molten steel smelted again through conventional continuous casting process production, control in the process final C content≤
0.0050%, that is, obtain described elevated oxygen level steel.
Preferably, molten steel total amount Ms is less than 300 tons.The control of oxygen content (is contained with molten steel total amount
The ladle place capacity of molten steel) relevant, computing formula M of aluminum shot addition in deoxidation processAl=k × (W1- 0.7 × W2)×
Ms is less than 300 tons in molten steel total amount and sums up.
The present invention has advantages below：
First, the present invention is obtained the total oxygen content of elevated oxygen level steel in the range of 0.005～0.030%, by the smelting side
Legal system obtains the total oxygen content of steel with desired value deviation less than 10%, and Control for Oxygen Content is stable, it is adaptable to which continuous casting process is produced；
Second, in steel obtained in the inventive method, Als content is less than 0.0050%, forms non-oxide aluminium class in a large number in steel
Oxide be mingled with；Mainly MnS and the composite oxygen containing Mn, Me (Me is one or two in Nb, V, Ti, Cr) element
Compound, particular characteristic such as scaling resistance, free-cutting machinability, the weldability etc. to steel plate produce beneficial effect；
3rd, the inventive method prepares elevated oxygen level steel and processes without the need for calm, and production efficiency is high, is formed in obtained steel
Diameter globular inclusion less than 5 μm is uniformly distributed in a large number, and such shaped steel can be used to manufacture the steel plate with particular characteristic, such as ward off
Porcelain steel, automatic steel, high input energy welding steel etc..
Description of the drawings
Fig. 1 is the scanning electron microscope (SEM) photograph of elevated oxygen level steel of the present invention；
Specific embodiment
The elevated oxygen level steel of the present invention and its smelting process are further described below by specific embodiment：
Table 1 lists the percetage by weight of 1～6 elevated oxygen level steel chemical composition of embodiment, balance of Fe and inevitable
Impurity.
1 embodiment of table, 1～6 elevated oxygen level steel chemical composition (Wt%)
| Embodiment | C | Mn | Si | P | S | Als | Nb | Ti | V | Cr | O |
| 1 | 0.0008 | 0.25 | 0.005 | 0.015 | 0.009 | 0.0045 | 0.031 | 0.052 | - | - | 0.0290 |
| 2 | 0.0021 | 0.43 | 0.003 | 0.009 | 0.011 | 0.0022 | - | - | - | 0.094 | 0.023 |
| 3 | 0.0015 | 0.45 | 0.003 | 0.011 | 0.021 | 0.0018 | 0.034 | - | 0.060 | - | 0.019 |
| 4 | 0.0026 | 0.13 | 0.008 | 0.010 | 0.008 | 0.0014 | - | 0.041 | 0.053 | - | 0.008 |
| 5 | 0.0045 | 0.62 | 0.004 | 0.019 | 0.025 | 0.0023 | - | 0.082 | - | - | 0.005 |
| 6 | 0.0012 | 0.86 | 0.005 | 0.011 | 0.036 | 0.0014 | 0.061 | - | - | - | 0.012 |
Embodiment 1：
After molten iron pretreatment takes off S and P, converter smelting is injected, converter smelting endpoint C content is 0.038%, before tapping, adopts
Mid-carbon fe-mn deoxidation alloying is used, deoxidation alloying terminal O content is 0.061%, tapping temperature is 1718 DEG C, basicity of slag is
3.2, slag-stopping tapping, thickness of slag layer are 60mm；Deep Decarburising and refining is carried out in RH purifier, and molten steel reaches oxygen blast after vacuum station
Decarburization, blowing oxygen quantity are 128m3, it is subsequently vacuumed out, vacuum maintains below 50Pa, processes 18min to deep decarburization terminal, deep de-
Carbon terminal C content reaches 0.0006%；Ladle chemistry is measured by sampling, and is 560ppm (W with oxygen rifle measure oxygen content1),
Molten steel total amount is 208 tons (Ms), and steel plate target total oxygen content is 300ppm (W2), according to computing formula it is：MAl=k × (W1-
0.7×W2) × Ms, wherein, MAlUnit is kg, W1And W2It is ton that unit is ppm, Ms unit, and k is deoxygenation coefficient, and value is
0.0015, the addition for calculating aluminum shot is 109kg (MAl)；After adding 109kg aluminum shot deoxidation, vacuum cycle 3min, then add successively
Enter ferromanganese, ferro-niobium and ferrotianium alloying again, yield of alloy deducts 10～15% calculating by killed steel recovery rate, then alloying is complete
Become rear vacuum cycle 7min, terminate vacuum, plus thermal-insulating covering agent.Control final C content≤0.0050%, through conventional continuous casting work
Skill is produced, that is, obtain the steel that embodiment 1 in table 1 corresponds to chemical composition.After testing, globular inclusion, field trash are defined in steel
Mainly a small amount of MnS and a large amount of composite oxides containing Mn, Nb, Ti, field trash mass percent is 0.067%.
Embodiment 2：
After molten iron pretreatment takes off S and P, converter smelting is injected, converter smelting endpoint C content is 0.039%, before tapping, adopts
Mid-carbon fe-mn deoxidation alloying is used, deoxidation alloying terminal O content is 0.068%, tapping temperature is 1705 DEG C, basicity of slag is
3.1, slag-stopping tapping, thickness of slag layer 80mm；Deep Decarburising and refining is carried out in RH purifier, and oxygen blast after molten steel reaches vacuum station takes off
Carbon, blowing oxygen quantity are 163m3, it is subsequently vacuumed out, vacuum maintains below 50Pa, processes 19min to deep decarburization terminal, deep decarburization
Terminal C content reaches 0.0017%；Ladle chemistry is measured by sampling, and oxygen content 310ppm (W is determined with oxygen rifle1), molten steel
214 tons of total amount (Ms), steel plate target total oxygen content 240ppm (W2), according to its computing formula it is：MAl=k × (W1- 0.7 × W2)
× Ms, wherein, MAlUnit is kg, W1And W2It is ton that unit is ppm, Ms unit, and k is deoxygenation coefficient, and value is 0.0015, calculates
The addition of aluminum shot is 46kg (MAl)；After adding 46kg aluminum shot deoxidation, vacuum cycle 2min, sequentially add ferromanganese and ferrochrome again
Alloying, yield of alloy deduct 10～15% calculating, then vacuum cycle 6min after the completion of alloying, knot by killed steel recovery rate
Bundle vacuum, plus thermal-insulating covering agent.Control final C content≤0.0050%, produce through conventional continuous casting process, that is, obtain in table 1
Embodiment 2 corresponds to the steel of chemical composition.After testing, globular inclusion is defined in steel, and field trash is mainly a small amount of MnS and a large amount of
Composite oxides containing Mn, Cr, field trash mass percent are 0.051%.
Embodiment 3：
After molten iron pretreatment takes off S and P, converter smelting is injected, converter smelting endpoint C content is 0.032%, before tapping, adopts
Mid-carbon fe-mn deoxidation alloying is used, deoxidation alloying terminal O content is 0.061%, tapping temperature is 1709 DEG C, basicity of slag is
3.2, slag-stopping tapping, thickness of slag layer 60mm；Deep Decarburising and refining is carried out in RH purifier, and oxygen blast after molten steel reaches vacuum station takes off
Carbon, blowing oxygen quantity are 150m3, it is subsequently vacuumed out, vacuum maintains below 50Pa, processes 18min to deep decarburization terminal, deep decarburization
Terminal C content reaches 0.0011%；Ladle chemistry is measured by sampling, and oxygen content 410ppm (W is determined with oxygen rifle1), molten steel
205 tons of total amount (Ms), steel plate target total oxygen content 200ppm (W2), according to its computing formula it is：MAl=k × (W1- 0.7 × W2)
× Ms, wherein, MAlUnit is kg, W1And W2It is ton that unit is ppm, Ms unit, and k is deoxygenation coefficient, and value is 0.0015, calculates
The addition of aluminum shot is 83kg (MAl)；Add 83kg aluminum shot deoxidation after, vacuum cycle 3min, sequentially add ferromanganese, ferro-niobium and
Vanadium iron alloying again, yield of alloy deduct 10～15% calculating, then vacuum cycle after the completion of alloying by killed steel recovery rate
7min, terminates vacuum, plus thermal-insulating covering agent.Control final C content≤0.0050%, produce through conventional continuous casting process, obtain final product
To in table 1, embodiment 3 corresponds to the steel of chemical composition.After testing, globular inclusion is defined in steel, and field trash is mainly a large amount of
MnS and the composite oxides containing Mn, Nb, V, field trash mass percent are 0.046%.
Embodiment 4：
After molten iron pretreatment takes off S and P, converter smelting is injected, converter smelting endpoint C content is 0.038%, before tapping, adopts
Mid-carbon fe-mn deoxidation alloying is used, deoxidation alloying terminal O content is 0.067%, tapping temperature is 1720 DEG C, basicity of slag is
3.3, slag-stopping tapping, thickness of slag layer 85mm；Deep Decarburising and refining is carried out in RH purifier, and oxygen blast after molten steel reaches vacuum station takes off
Carbon, blowing oxygen quantity are 63m3, it is subsequently vacuumed out, vacuum maintains below 50Pa, processes 17min to deep decarburization terminal, deep decarburization
Terminal C content reaches 0.0022%；Ladle chemistry is measured by sampling, and oxygen content 210ppm (W is determined with oxygen rifle1), molten steel
210 tons of total amount (Ms), steel plate target total oxygen content 80ppm (W2), according to its computing formula it is：MAl=k × (W1- 0.7 × W2)
× Ms, wherein, MAlUnit is kg, W1And W2It is ton that unit is ppm, Ms unit, and k is deoxygenation coefficient, and value is 0.0015, calculates
The addition of aluminum shot is 49kg (MAl)；After adding 49kg aluminum shot deoxidation, vacuum cycle 3min, sequentially add ferromanganese, ferrotianium, vanadium
Iron alloying again, yield of alloy deduct 10～15% calculating, then vacuum cycle after the completion of alloying by killed steel recovery rate
7min, terminates vacuum, plus thermal-insulating covering agent.Control final C content≤0.0050%, produce through conventional continuous casting process, obtain final product
To in table 1, embodiment 4 corresponds to the steel of chemical composition.After testing, globular inclusion is defined in steel, and field trash is mainly a small amount of
MnS and a large amount of composite oxides containing Mn, Ti, V, field trash mass percent is 0.029%.
Embodiment 5：
After molten iron pretreatment takes off S and P, converter smelting is injected, converter smelting endpoint C content is 0.032%, before tapping, adopts
Mid-carbon fe-mn deoxidation alloying is used, deoxidation alloying terminal O content is 0.066%, tapping temperature is 1716 DEG C, basicity of slag is
3.2, slag-stopping tapping, thickness of slag layer 70mm；Deep Decarburising and refining is carried out in RH purifier, and oxygen blast after molten steel reaches vacuum station takes off
Carbon, blowing oxygen quantity are 18m3, it is subsequently vacuumed out, vacuum maintains below 50Pa, processes 16min to deep decarburization terminal, deep decarburization
Terminal C content reaches 0.0041%；Ladle chemistry is measured by sampling, and oxygen content 360ppm (W is determined with oxygen rifle1), molten steel
198 tons of total amount (Ms), steel plate target total oxygen content 60ppm (W2), according to its computing formula it is：MAl=k × (W1- 0.7 × W2)
× Ms, wherein, MAlUnit is kg, W1And W2It is ton that unit is ppm, Ms unit, and k is deoxygenation coefficient, and value is 0.0015, calculates
The addition of aluminum shot is 94kg (MAl)；After adding 94kg aluminum shot deoxidation, vacuum cycle 3min, sequentially add ferromanganese and ferrotianium again
Alloying, yield of alloy deduct 10～15% calculating, then vacuum cycle 7min after the completion of alloying, knot by killed steel recovery rate
Bundle vacuum, plus thermal-insulating covering agent.Control final C content≤0.0050%, produce through conventional continuous casting process, that is, obtain in table 1
Embodiment 5 corresponds to the steel of chemical composition.After testing, globular inclusion is defined in steel, and field trash is mainly a large amount of MnS and contains
The composite oxides of Mn, Ti, field trash mass percent are 0.021%.
Embodiment 6：
After molten iron pretreatment takes off S and P, converter smelting is injected, converter smelting endpoint C content is 0.033%, before tapping, adopts
Mid-carbon fe-mn deoxidation alloying is used, deoxidation alloying terminal O content is 0.061%, tapping temperature is 1708 DEG C, basicity of slag is
3.1, slag-stopping tapping, thickness of slag layer 80mm；Deep Decarburising and refining is carried out in RH purifier, and oxygen blast after molten steel reaches vacuum station takes off
Carbon, blowing oxygen quantity are 196m3, it is subsequently vacuumed out, vacuum maintains below 50Pa, processes 20min to deep decarburization terminal, deep decarburization
Terminal C content reaches 0.0010%；Ladle chemistry is measured by sampling, and oxygen content 300ppm (W is determined with oxygen rifle1), molten steel
202 tons of total amount (Ms), steel plate target total oxygen content 120ppm (W2), according to its computing formula it is：MAl=k × (W1- 0.7 × W2)
× Ms, wherein, MAlUnit is kg, W1And W2It is ton that unit is ppm, Ms unit, and k is deoxygenation coefficient, and value is 0.0015, calculates
The addition of aluminum shot is 65kg (MAl)；After adding 65kg aluminum shot deoxidation, vacuum cycle 2min, sequentially add ferromanganese and ferro-niobium again
Alloying, yield of alloy deduct 10～15% calculating, then vacuum cycle 6min after the completion of alloying, knot by killed steel recovery rate
Bundle vacuum, plus thermal-insulating covering agent.Control final C content≤0.0050%, produce through conventional continuous casting process, that is, obtain in table 1
Embodiment 6 corresponds to the steel of chemical composition.After testing, globular inclusion is defined in steel, and field trash is mainly a large amount of MnS and contains
The composite oxides of Mn, Nb, field trash mass percent are 0.043%.
As can be seen from Figure 1 steel inclusion is in spherical, mainly MnS and (Me is Nb, V, Ti, Cr containing Mn, Me
In one or two) composite oxides of element, these globular inclusions are (hot rolling, cold rolling in subsequent machining technology with steel
Deng) change such as can be deformed, elongate, crushing, the field trash with certain fractions distribution in steel product is ultimately formed, to steel
The particular characteristic of plate such as scaling resistance, free-cutting machinability, weldability etc. produce beneficial effect.
Claims (5)
1. a kind of elevated oxygen level steel, it is characterised in that：The percetage by weight of the elevated oxygen level steel chemical composition is：C≤
0.0050%th, Mn：0.10～1.00%, Si≤0.010%, P≤0.020%, S≤0.040%, Als≤0.0050%, Me：
0.010～0.100%, O：0.005～0.030%, and Mn, Si, Als and Me total amount is not less than 0.15%, balance of Fe and not
Evitable impurity；Wherein, the Me is one or two in Nb, V, Ti, Cr；
Its preparation method is by molten iron pretreatment, converter smelting, deoxidation alloying, tapping, deep Decarburising and refining, adds aluminum shot to take off
Oxygen, again alloying and continuous casting obtain elevated oxygen level steel, and the method comprises the steps：
1) molten iron pretreatment：Slough S and P；
2) converter smelting：By step 1) in pretreated molten iron inject converter smelting, converter smelting endpoint C content is 0.030
～0.040%；
3) deoxidation alloying：To step 2) middle addition mid-carbon fe-mn deoxidation alloying, deoxidation alloying terminal O content is 0.050
～0.070%；
4) tap：Tapping temperature is 1700～1730 DEG C, it is ensured that molten steel is weak fluidized state；Basicity of slag is 3.0～4.0, gear
Slag is tapped, thickness of slag layer≤100mm；
5) deep Decarburising and refining：Deep Decarburising and refining is carried out in RH purifier, and molten steel reaches oxygen decarburization after vacuum station, vacuum
Below 50Pa is maintained, 15～20min is processed, deep Decarburising and refining terminal C content reaches less than 0.0030%；
6) aluminum shot deoxidation is added：Take step 5) the steel water determination ladle chemistry that obtains, Oxygen Content in Liquid Steel is determined with oxygen rifle
W1, according to molten steel total amount Ms, Oxygen Content in Liquid Steel W1With steel plate target total oxygen content W2Calculate aluminum shot addition MAl, its computing formula
For：
MAl=k × (W1- 0.7 × W2)×Ms
Wherein, MAlUnit is kg, W1And W2Unit is ppm, MsUnit is ton；K is deoxygenation coefficient, and value is 0.0015；
7) alloying again：After adding aluminum shot deoxidation, 2～3min of vacuum cycle, required alloy is sequentially added, after the completion of alloying
5～8min of vacuum cycle, plus thermal-insulating covering agent again；
8) by step 7) molten steel smelted again through conventional continuous casting process production, control in the process final C content≤
0.0050%, that is, obtain described elevated oxygen level steel.
2. elevated oxygen level steel according to claim 1, it is characterised in that：The weight percent of the elevated oxygen level steel chemical composition
Number is：C：0.0007～0.0050%, Mn：0.10～0.50%, Si：0.004～0.010%, P：0.010～0.020%, S：
0.008～0.040%, Als：0.0040～0.0050%, Me：0.030～0.090%, O：0.020～0.030%, and Mn,
Si, Als and Me total amount is not less than 0.15%, balance of Fe and inevitable impurity；Wherein, the Me is in Nb, V, Ti, Cr
One or two.
3. elevated oxygen level steel according to claim 2, it is characterised in that：The weight percent of the elevated oxygen level steel chemical composition
Number is：C：0.0008%th, Mn：0.25%th, Si：0.005%th, P：0.015%th, S：0.009%th, Als：0.0045%th, Nb：
0.031%th, Ti：0.052%th, O：0.0290%.
4. the smelting process of elevated oxygen level steel described in a kind of claim 1, it be by molten iron pretreatment, converter smelting, deoxidation
Alloying, tapping, deep Decarburising and refining, addition aluminum shot deoxidation, again alloying and continuous casting obtain elevated oxygen level steel, and its feature exists
In：The method comprises the steps：
1) molten iron pretreatment：Slough S and P；
2) converter smelting：By step 1) in pretreated molten iron inject converter smelting, converter smelting endpoint C content is 0.030
～0.040%；
3) deoxidation alloying：To step 2) middle addition mid-carbon fe-mn deoxidation alloying, deoxidation alloying terminal O content is 0.050
～0.070%；
4) tap：Tapping temperature is 1700～1730 DEG C, it is ensured that molten steel is weak fluidized state；Basicity of slag is 3.0～4.0, gear
Slag is tapped, thickness of slag layer≤100mm；
5) deep Decarburising and refining：Deep Decarburising and refining is carried out in RH purifier, and molten steel reaches oxygen decarburization after vacuum station, vacuum
Below 50Pa is maintained, 15～20min is processed, deep Decarburising and refining terminal C content reaches less than 0.0030%；
6) aluminum shot deoxidation is added：Take step 5) the steel water determination ladle chemistry that obtains, Oxygen Content in Liquid Steel is determined with oxygen rifle
W1, according to molten steel total amount Ms, Oxygen Content in Liquid Steel W1With steel plate target total oxygen content W2Calculate aluminum shot addition MAl, its computing formula
For：
MAl=k × (W1- 0.7 × W2)×Ms
Wherein, MAlUnit is kg, W1And W2Unit is ppm, MsUnit is ton；K is deoxygenation coefficient, and value is 0.0015；
7) alloying again：After adding aluminum shot deoxidation, 2～3min of vacuum cycle, required alloy is sequentially added, after the completion of alloying
5～8min of vacuum cycle, plus thermal-insulating covering agent again；
8) by step 7) molten steel smelted again through conventional continuous casting process production, control in the process final C content≤
0.0050%, that is, obtain described elevated oxygen level steel.
5. the smelting process of elevated oxygen level steel according to claim 4, it is characterised in that：Molten steel total amount MsLess than 300
Ton.
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| KR101969109B1 (en) * | 2017-08-21 | 2019-04-15 | 주식회사 포스코 | Porcelain enamel steel sheet and manufacturing method thereof |
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| JP4197375B2 (en) * | 1999-05-14 | 2008-12-17 | 新日本製鐵株式会社 | Extremely low carbon steel with excellent endless rolling and formability |
| JP3412565B2 (en) * | 1999-06-25 | 2003-06-03 | 住友金属工業株式会社 | Steel plate for enamel with excellent nail flying resistance and adhesion and method for producing the same |
| KR101065545B1 (en) * | 2006-04-04 | 2011-09-19 | 신닛뽄세이테쯔 카부시키카이샤 | Very thin hard steel sheet and method for producing the same |
| KR20100021274A (en) * | 2008-08-14 | 2010-02-24 | 주식회사 포스코 | Enameling steel sheet and manufacturing method thereof |
| KR101356055B1 (en) * | 2009-12-18 | 2014-01-28 | 주식회사 포스코 | Enameling steel sheet with surface defect free and manufacturing method thereof |
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