CN109988885B - Production method of low-carbon killed steel - Google Patents
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- CN109988885B CN109988885B CN201910397891.1A CN201910397891A CN109988885B CN 109988885 B CN109988885 B CN 109988885B CN 201910397891 A CN201910397891 A CN 201910397891A CN 109988885 B CN109988885 B CN 109988885B
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- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 126
- 229910000655 Killed steel Inorganic materials 0.000 title claims abstract description 37
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 25
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 106
- 239000010959 steel Substances 0.000 claims abstract description 106
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 88
- 239000002893 slag Substances 0.000 claims abstract description 74
- 238000000034 method Methods 0.000 claims abstract description 42
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 22
- 239000000463 material Substances 0.000 claims abstract description 20
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 20
- 239000010703 silicon Substances 0.000 claims abstract description 20
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 19
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 19
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 19
- 239000004571 lime Substances 0.000 claims abstract description 19
- 238000009835 boiling Methods 0.000 claims abstract description 16
- 238000010438 heat treatment Methods 0.000 claims abstract description 16
- 238000010079 rubber tapping Methods 0.000 claims abstract description 11
- 238000010891 electric arc Methods 0.000 claims abstract description 4
- 229910001570 bauxite Inorganic materials 0.000 claims description 16
- 239000003795 chemical substances by application Substances 0.000 claims description 14
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 10
- 238000007670 refining Methods 0.000 claims description 10
- 238000002844 melting Methods 0.000 claims description 6
- 230000008018 melting Effects 0.000 claims description 6
- 238000005275 alloying Methods 0.000 claims description 4
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 3
- 238000005266 casting Methods 0.000 claims description 3
- 239000000571 coke Substances 0.000 claims description 3
- 238000006477 desulfuration reaction Methods 0.000 claims description 3
- 230000023556 desulfurization Effects 0.000 claims description 3
- 239000010436 fluorite Substances 0.000 claims description 3
- XWHPIFXRKKHEKR-UHFFFAOYSA-N iron silicon Chemical compound [Si].[Fe] XWHPIFXRKKHEKR-UHFFFAOYSA-N 0.000 claims description 3
- 239000002006 petroleum coke Substances 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 230000003749 cleanliness Effects 0.000 abstract description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 20
- 229910052786 argon Inorganic materials 0.000 description 10
- 238000007664 blowing Methods 0.000 description 10
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 6
- 239000001301 oxygen Substances 0.000 description 6
- 229910052760 oxygen Inorganic materials 0.000 description 6
- 238000009628 steelmaking Methods 0.000 description 6
- 241001536352 Fraxinus americana Species 0.000 description 5
- 239000011521 glass Substances 0.000 description 5
- 230000000630 rising effect Effects 0.000 description 5
- RGKMZNDDOBAZGW-UHFFFAOYSA-N aluminum calcium Chemical compound [Al].[Ca] RGKMZNDDOBAZGW-UHFFFAOYSA-N 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 2
- OSMSIOKMMFKNIL-UHFFFAOYSA-N calcium;silicon Chemical compound [Ca]=[Si] OSMSIOKMMFKNIL-UHFFFAOYSA-N 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910000676 Si alloy Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- CSJDCSCTVDEHRN-UHFFFAOYSA-N methane;molecular oxygen Chemical compound C.O=O CSJDCSCTVDEHRN-UHFFFAOYSA-N 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 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
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention relates to a production method of low-carbon killed steel, wherein the mass percentage of the upper limit of the carbon content of the low-carbon killed steel is 0.10-0.25%, carbon is left in a converter for boiling tapping, and the mass percentage of the carbon content at the end point is controlled according to that C is more than or equal to 0.05% and less than or equal to-0.03% of the upper limit of the finished product carbon; after molten steel in a boiling state enters an LF furnace treatment position, firstly adding a first batch of slag material to dilute the oxidability of top slag in a molten steel tank, and then adding a carbon deoxidizer; heating the electrode, and deoxidizing the carbide slag at high temperature by using lime, a carbon deoxidizer and an electric arc. The advantages are that: the method is carried out in an LF furnace under normal pressure. The carbon deoxidizer is used to replace partial silicon and aluminum as deoxidizer, so that the cost is reduced. Compared with the silicon deoxidation process and the aluminum deoxidation process which are commonly used at present, the cost per ton of steel can be reduced by 10-20 yuan. Meanwhile, the carbon deoxidation does not leave deoxidation product residues in the molten steel, and is beneficial to improving the cleanliness of the molten steel.
Description
Technical Field
The invention belongs to the field of low-carbon steel production, and particularly relates to a production method of low-carbon killed steel.
Background
In the conventional steelmaking method, especially for producing low-carbon killed steel, deoxidation is mainly completed by depending on elements such as silicon, aluminum and the like which have stronger affinity with oxygen than iron. These elements react with oxygen dissolved in the molten steel to form deoxidation products insoluble in the molten steel, and the oxygen content in the steel is reduced due to their floating out.
The carbon deoxidation process is mainly applied to vacuum conditions, and carbon and oxygen are reacted by using RH, VD and other vacuum refining equipment. Under the vacuum condition, the excess carbon in the molten steel can react with oxygen to produce carbon-oxygen reaction, so that the oxygen in the molten steel can be changed into CO to be removed, at this time, the carbon can be used as deoxidant under the vacuum condition, and its deoxidization capacity can be raised with the improvement of vacuum degree. However, the vacuum condition for carbon deoxidation has high cost, and is commonly used for ultra-low carbon steel, high-grade pipeline steel with special requirements on gas content and other steel grades.
The low-carbon killed steel is produced under normal pressure, and generally, silicon alloy or aluminum alloy is added for deoxidation in the process of converter tapping, so that molten steel enters refining treatment after being killed. And a small amount of carburant is added in the tapping process of the converter for primary deoxidation, and then silicon deoxidation or aluminum deoxidation and alloying treatment are carried out. However, the foaming degree of the top slag is not easy to control, and the slag overflow risk is large. At present, silicon deoxidation or aluminum deoxidation is adopted to produce low-carbon killed steel, so that the production cost is higher.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a production method of low-carbon killed steel, which adopts a carbon deoxidation process under normal pressure to produce the low-carbon killed steel with the carbon content of the finished product of which the upper limit is 0.10-0.25 percent, utilizes the carbon deoxidizer, lime and electrode to heat up high-temperature carbide slag for deoxidation, improves the heating efficiency, reduces the consumption of the deoxidizer, reduces the alloy cost, reduces the Al2O3The molten steel cleanliness is improved.
In order to achieve the purpose, the invention is realized by the following technical scheme:
the production method of the low-carbon killed steel comprises the following steps of:
1) making steel
a, leaving carbon in a converter, boiling and tapping, wherein the mass percent of the carbon content at the end point is controlled according to the mass percent of more than or equal to 0.05 percent and less than or equal to-0.03 percent of the upper limit of finished carbon;
b, controlling the clearance of the molten steel tank to be 400-600 mm;
2) refining
a, after molten steel in a boiling state enters an LF furnace treatment position, firstly adding a first batch of slag material to dilute the oxidability of top slag in a molten steel tank, and then adding a carbon deoxidizer;
b, heating the electrode, namely performing deoxidation by utilizing lime, a carburant and the high temperature of electric arc to generate carbide slag, adding two batches of slag in the heating process, wherein the weight ratio of the lime to the slag melting agent in the two batches of slag is controlled to be 4: 1-5: 1; controlling the amount of the slag charge of the second batch to be 0-6 kg/ton steel;
c, after the temperature is raised, adding a deoxidizing agent for final deoxidation, desulfurization, taking a process sample, alloying according to the process sample, finally adjusting the components, and casting on a machine.
The slagging agent in the step 2) is fluorite or bauxite or a slagging material taking bauxite as a main component; the carbon deoxidizer is a coke carburant or a petroleum coke carburant.
The first batch of slag charge and the adding amount thereof in the step 2) are 4-5 kg of lime per ton of steel and 2-2.5 kg of slag melting agent per ton of steel; the addition amount of the carbon deoxidizer is as follows: the amount of molten steel is x (the upper limit of finished carbon-the carbon content in molten steel is-0.01%)/the carbon deoxidizer carbon content.
When the deoxidizer in the step 2) is an aluminum wire section, the produced low-carbon killed steel is low-carbon aluminum killed steel; the number of the added first batch of aluminum wire sections is 1.1-1.9 kg/ton steel.
When the deoxidizer in the step 2) is ferrosilicon, the produced low-carbon killed steel is low-carbon silicon killed steel; adding the first batch of ferrosilicon after temperature rise: the molten steel amount is multiplied by (the upper limit of finished product silicon-the silicon content in the molten steel)/the silicon-iron content.
Compared with the prior art, the invention has the beneficial effects that:
1. the production method of low-carbon killed steel is characterized by that the carbon deoxidation reaction is mainly implemented in LF furnace under the normal pressure. The carbon deoxidizer is used to replace partial silicon and aluminum as deoxidizer, so that the cost is reduced. Compared with the silicon deoxidation process and the aluminum deoxidation process which are commonly used at present, the cost per ton of steel can be reduced by 10-20 yuan. Meanwhile, the carbon deoxidation does not leave deoxidation product residues in the molten steel, and is beneficial to improving the cleanliness of the molten steel.
2. The invention uses the existing production equipment, adopts boiling molten steel to enter an LF furnace, and adds a carbon deoxidizer, lime and a slagging agent into the molten steel in a boiling state, and utilizes the carbon deoxidizer, the lime and the high temperature of an electrode to heat up to produce carbide slag for deoxidation.
3. The proportion of the lime of the first slag material of the LF furnace and the slagging agent is controlled, so that the carbide slag generated in the carbon deoxidation reaction process has a good submerged arc effect, and the electrode heating efficiency can be improved. And an electrode heating mode is adopted, and the heating rate of the LF furnace is increased from 3-5 ℃/min to 4-6 ℃/min.
4. In the LF process, a carbon deoxidizer is added to the boiling molten steel, so that slag overflow is likely to occur. The slag is added firstly to dilute the oxidability of the top slag in the molten steel tank, so that the slag overflow risk of adding a carbon deoxidizer is eliminated; the carbon deoxidation process can meet the normal production requirement.
5. The method can improve the accuracy of the first aluminum addition of the deoxidizer in the LF furnace, and avoid the phenomenon of repeated aluminum addition of the deoxidizer caused by inaccurate first aluminum addition of the deoxidizer. Thereby ensuring the stable quality of the molten steel after the LF furnace is finished and the stable production of the LF furnace.
6. By adopting the method, the silicon return of the molten steel in the LF furnace treatment process can be reduced, and the low-silicon killed steel with the upper limit of 0.03 percent of the finished product silicon can be stably produced.
7. The operation of the LF is greatly influenced by the LF length experience and the molten steel entering the LF, the operation of the LF is modeled, the influence of human factors and the molten steel entering the LF on the operation of the LF is reduced, and the method is favorable for realizing the intelligent production of the LF.
Detailed Description
The present invention is described in detail below, but it should be noted that the practice of the present invention is not limited to the following embodiments.
The production method of the low-carbon killed steel comprises the following steps of:
1) making steel
a, leaving carbon in a converter, boiling and tapping, wherein the mass percent of the carbon content at the end point is controlled according to the mass percent of more than or equal to 0.05 percent and less than or equal to-0.03 percent of the upper limit of finished carbon;
b, controlling the clearance of the molten steel tank to be 300-600 mm;
2) refining
a, after molten steel in a boiling state enters an LF furnace treatment position, firstly adding a first batch of slag material to dilute the oxidability of top slag in a molten steel tank, and then adding a carbon deoxidizer;
b, heating the electrode for 5-10 minutes, performing high-temperature acetylene sludge deoxidation by using lime, a carbon deoxidizer and an electric arc, and adding two batches of slag materials in the heating process, wherein the weight ratio of the lime to the slag melting agent in the two batches of slag materials is controlled to be 4: 1-5: 1; controlling the amount of the slag charge of the second batch to be 0-6 kg/ton steel;
c, after the temperature is raised, adding a deoxidizing agent for final deoxidation, desulfurization, taking a process sample, alloying according to the process sample, finally adjusting the components, and casting on a machine.
The slagging agent in the step 2) is fluorite or bauxite or a slagging material taking bauxite as a main component; the carbon deoxidizer is a coke carburant or a petroleum coke carburant.
The first batch of slag charge and the adding amount thereof in the step 2) are 4-5 kg of lime per ton of steel and 2-2.5 kg of slag melting agent per ton of steel; the addition amount of the carbon deoxidizer is as follows: the amount of molten steel is x (the upper limit of finished carbon-the carbon content in molten steel is-0.01%)/the carbon deoxidizer carbon content.
When the deoxidizer in the step 2) is an aluminum wire section, the produced low-carbon killed steel is low-carbon aluminum killed steel; the number of the added first batch of aluminum wire sections is 1.1-1.9 kg/ton steel, the upper limit of finished carbon is higher than the lower limit, and the upper limit of finished carbon is lower than the upper limit.
When the deoxidizer in the step 2) is ferrosilicon, the produced low-carbon killed steel is low-carbon silicon killed steel; adding the first batch of ferrosilicon after temperature rise: the molten steel amount is multiplied by (the upper limit of finished product silicon-the silicon content in the molten steel)/the silicon-iron content.
Example one
The production method of the low-carbon killed steel comprises the following steps of:
1. steel-making process
1) The end point carbon content of the converter is 0.05 percent;
2) tapping is carried out in a boiling way, and the clearance of the large tank is 400 mm.
2. Refining procedure
1) After molten steel enters an LF furnace treatment position, adding slag (4 kg/ton of steel white ash and 2 kg/ton of steel bauxite), and after the slag is completely melted, adding a carbon deoxidizer, wherein the adding amount of the carbon deoxidizer is x (the upper carbon limit of a finished product-the carbon content in the molten steel is-0.01%)/the carbon deoxidizer carbon content; .
2) Heating the electrode for 9 minutes, and blowing argon: 200L/min.
3) In the temperature rising process, adding the rest slag materials, wherein lime and bauxite in the rest slag materials are respectively 2 kg/ton steel and 0.5 kg/ton steel;
4) after the temperature rise, the addition amount of the first batch of aluminum wire segments is 1.8 kg/ton steel.
5) And (3) timely sticking and taking the slag sample, and when the slag sample changes color and is light green or transparent glass slag, taking the process sample and finally adjusting the components according to the process sample.
6) After molten steel is alloyed, feeding an aluminum-calcium wire of 2 m/ton steel, and blowing argon for 3 minutes to machine.
Example two
The production method of the low-carbon killed steel comprises the following steps of:
1. steel-making process
1) The carbon content at the end point of the converter is 0.06 percent;
2) tapping is carried out in a boiling way, and the clearance of the large tank is 500 mm.
2. Refining procedure
1) After molten steel enters an LF furnace treatment position, adding slag (4.5 kg/ton steel white ash and 2.3 kg/ton steel bauxite), and after the slag is completely melted, adding a carbon deoxidizer, wherein the adding amount of the carbon deoxidizer is x (finished carbon upper limit-carbon content in molten steel-0.01%)/carbon deoxidizer carbon content; .
2) Heating the electrode for 8 minutes, and blowing argon: 260L/min.
3) In the temperature rising process, adding the rest slag materials, wherein the lime and the bauxite in the rest slag materials are respectively 1.5 kg/ton steel and 0.3 kg/ton steel;
4) after the temperature rise, the addition amount of the first batch of aluminum wire segments is 1.5 kg/ton steel.
5) And (3) timely sticking and taking the slag sample, and when the slag sample changes color and is light green or transparent glass slag, taking the process sample and finally adjusting the components according to the process sample.
6) After molten steel is alloyed, feeding an aluminum-calcium wire of 2.5 m/ton steel, and blowing argon for 3 minutes.
EXAMPLE III
The production method of the low-carbon killed steel comprises the following steps of:
1. steel-making process
1) The end point carbon content of the converter is 0.09%;
2) tapping is carried out in a boiling way, and the clearance of the big tank is 600 mm.
2. Refining procedure
1) After molten steel enters an LF furnace treatment position, adding slag (5 kg/ton of steel white ash and 2.5 kg/ton of steel bauxite), and after the slag is completely melted, adding a carbon deoxidizer, wherein the adding amount of the carbon deoxidizer is x (the upper limit of finished carbon-the carbon content in the molten steel is-0.01%)/the carbon deoxidizer carbon content; .
2) Heating the electrode for 10 minutes, and blowing argon: 300L/min.
3) In the temperature rising process, adding the rest slag materials, wherein lime and bauxite in the rest slag materials are respectively 3 kg/ton steel and 0.7 kg/ton steel;
4) after the temperature rise, the addition amount of the first batch of aluminum wire segments is 1.2 kg/ton steel.
5) And (3) timely sticking and taking the slag sample, and when the slag sample changes color and is light green or transparent glass slag, taking the process sample and finally adjusting the components according to the process sample.
6) After molten steel is alloyed, feeding 3 m/ton of steel aluminum-calcium wire, blowing argon for 3 minutes and loading the machine.
Example four
The production method of the low-carbon killed steel comprises the following steps of:
1. steel-making process
1) The carbon content at the end point of the converter is 0.06 percent;
2) tapping is carried out in a boiling way, and the clearance of the large tank is 500 mm.
2. Refining procedure
1) After molten steel enters an LF furnace treatment position, adding slag (4 kg/ton of steel white ash and 2 kg/ton of steel bauxite), and after the slag is completely melted, adding a carbon deoxidizer, wherein the adding amount of the carbon deoxidizer is x (the upper carbon limit of a finished product-the carbon content in the molten steel is-0.01%)/the carbon deoxidizer carbon content; .
2) Heating the electrode for 9 minutes, and blowing argon: 230L/min.
3) In the temperature rising process, adding the rest slag materials, wherein lime and bauxite in the rest slag materials are respectively 2 kg/ton steel and 0.4 kg/ton steel;
4) and after the temperature is raised, the adding amount of the ferrosilicon is the molten steel amount multiplied by (the upper limit of finished product silicon-the silicon content in the molten steel)/the silicon content of the ferrosilicon.
5) And (3) timely sticking and taking the slag sample, and when the slag sample changes color and is light green or transparent glass slag, taking the process sample and finally adjusting the components according to the process sample.
6) After molten steel is alloyed, feeding a silicon-calcium wire of 2 m/ton steel, and blowing argon for 3 minutes to machine.
EXAMPLE five
The production method of the low-carbon killed steel comprises the following steps of:
1. steel-making process
1) The end point carbon content of the converter is 0.12 percent;
2) tapping is carried out in a boiling way, and the clearance of the large tank is 400 mm.
2. Refining procedure
1) After molten steel enters an LF furnace treatment position, adding slag (4.3 kg/ton steel white ash and 2.2 kg/ton steel bauxite), and after the slag is completely melted, adding a carbon deoxidizer, wherein the adding amount of the carbon deoxidizer is x (finished carbon upper limit-carbon content in molten steel-0.01%)/carbon deoxidizer carbon content; .
2) Heating the electrode for 8 minutes, and blowing argon: 270L/min.
3) In the temperature rising process, adding the rest slag materials, wherein lime and bauxite in the rest slag materials are respectively 2.5 kg/ton steel and 0.5 kg/ton steel;
4) and after the temperature is raised, the adding amount of the ferrosilicon is the molten steel amount multiplied by (the upper limit of finished product silicon-the silicon content in the molten steel)/the silicon content of the ferrosilicon.
5) And (3) timely sticking and taking the slag sample, and when the slag sample changes color and is light green or transparent glass slag, taking the process sample and finally adjusting the components according to the process sample.
6) After molten steel is alloyed, feeding a silicon-calcium wire of 1.5 m/ton steel, and blowing argon for 3 minutes to machine.
Claims (5)
1. The production method of the low-carbon killed steel is characterized in that the mass percentage of the upper limit of the carbon content of the low-carbon killed steel is 0.10-0.25%, and the production method comprises the following steps:
1) making steel
a, leaving carbon in a converter, boiling and tapping, wherein the mass percent of the carbon content at the end point is controlled according to the mass percent of more than or equal to 0.05 percent and less than or equal to-0.03 percent of the upper limit of finished carbon;
b, controlling the clearance of the molten steel tank to be 400-600 mm;
2) refining
a, after molten steel in a boiling state enters an LF furnace treatment position, firstly adding a first batch of slag material to dilute the oxidability of top slag in a molten steel tank, and then adding a carbon deoxidizer; the carbon deoxidizer is a coke carburant or a petroleum coke carburant; the addition amount of the carbon deoxidizer is as follows: the amount of molten steel is x (the upper limit of finished carbon-the carbon content in molten steel is-0.01%)/the carbon content of the carbon deoxidizer;
b, heating the electrode, namely performing deoxidation by utilizing lime, a carburant and the high temperature of electric arc to generate carbide slag, adding two batches of slag in the heating process, wherein the weight ratio of the lime to the slag melting agent in the two batches of slag is controlled to be 4: 1-5: 1; controlling the amount of the slag charge of the second batch to be 0-6 kg/ton steel;
c, after the temperature is raised, adding a deoxidizing agent for final deoxidation, desulfurization, taking a process sample, alloying according to the process sample, finally adjusting the components, and casting on a machine.
2. The method for producing low-carbon killed steel according to claim 1, wherein the slagging agent in step 2) is fluorite or bauxite or a slagging material containing bauxite as a main component.
3. The method for producing low-carbon killed steel according to claim 1, wherein the first slag charge in step 2) and the addition amount thereof are 4-5 kg lime per ton steel and 2-2.5 kg slag melting agent per ton steel.
4. The method for producing a low-carbon killed steel as claimed in claim 1, wherein when the deoxidizer in step 2) c is an aluminum wire section, the produced low-carbon killed steel is a low-carbon aluminum killed steel; the number of the added aluminum wire segments is 1.1-1.9 kg/ton steel.
5. The method for producing a low-carbon killed steel as claimed in claim 1, wherein when the deoxidizer c in step 2) is ferrosilicon, the produced low-carbon killed steel is a low-carbon silicon killed steel; the quantity of added ferrosilicon after temperature rise is as follows: the molten steel amount is multiplied by (the upper limit of finished product silicon-the silicon content in the molten steel)/the silicon-iron content.
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| JPH0730388B2 (en) * | 1989-07-26 | 1995-04-05 | 川崎製鉄株式会社 | Low oxygen ultra low carbon steel manufacturing method |
| CN102051440A (en) * | 2009-11-10 | 2011-05-11 | 攀钢集团钢铁钒钛股份有限公司 | Molten steel deoxidizing and carbureting method and steelmaking method |
| KR101363927B1 (en) * | 2012-08-10 | 2014-02-20 | 주식회사 포스코 | Refining method of the molten steel |
| CN103014235B (en) * | 2013-01-07 | 2014-07-02 | 河北钢铁股份有限公司唐山分公司 | Deoxidizing process for reducing consumption of aluminum killed steel deoxidizing agent |
| CN103642970B (en) * | 2013-12-09 | 2016-01-13 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of smelting process of carbon aluminium-killed steel |
| CN103741007B (en) * | 2013-12-23 | 2015-08-19 | 武钢集团昆明钢铁股份有限公司 | A kind of production method reducing gas content in carbon aluminium-killed steel |
| CN105855494B (en) * | 2015-01-23 | 2019-02-26 | 鞍钢股份有限公司 | Processing method of small overwater square billet casting machine for low-carbon aluminum steel |
| CN108998613B (en) * | 2018-08-08 | 2020-06-23 | 鞍钢股份有限公司 | Method for controlling free oxygen in ultra-low carbon low aluminum steel |
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