CN117363826A - Deoxidation process for converter smelting screw-thread steel - Google Patents
Deoxidation process for converter smelting screw-thread steel Download PDFInfo
- Publication number
- CN117363826A CN117363826A CN202311337963.6A CN202311337963A CN117363826A CN 117363826 A CN117363826 A CN 117363826A CN 202311337963 A CN202311337963 A CN 202311337963A CN 117363826 A CN117363826 A CN 117363826A
- Authority
- CN
- China
- Prior art keywords
- steel
- tapping
- deoxidizing
- deoxidization
- screw
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 66
- 239000010959 steel Substances 0.000 title claims abstract description 66
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000003723 Smelting Methods 0.000 title claims description 12
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 38
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 36
- 238000010079 rubber tapping Methods 0.000 claims abstract description 35
- 229910052786 argon Inorganic materials 0.000 claims abstract description 19
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims abstract description 17
- 229910010271 silicon carbide Inorganic materials 0.000 claims abstract description 17
- 238000007664 blowing Methods 0.000 claims abstract description 15
- 238000009628 steelmaking Methods 0.000 claims abstract description 10
- 239000007789 gas Substances 0.000 claims abstract description 7
- 229910052799 carbon Inorganic materials 0.000 claims description 18
- 229910045601 alloy Inorganic materials 0.000 claims description 8
- 239000000956 alloy Substances 0.000 claims description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 229910052720 vanadium Inorganic materials 0.000 claims description 3
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 claims description 3
- 229910000720 Silicomanganese Inorganic materials 0.000 claims description 2
- 238000003756 stirring Methods 0.000 claims description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 7
- 239000001301 oxygen Substances 0.000 abstract description 7
- 229910052760 oxygen Inorganic materials 0.000 abstract description 7
- 238000009749 continuous casting Methods 0.000 abstract description 5
- 230000007547 defect Effects 0.000 abstract description 3
- 238000007920 subcutaneous administration Methods 0.000 abstract description 3
- NCJRLCWABWKAGX-UHFFFAOYSA-N [Si].[Ca].[Ba] Chemical compound [Si].[Ca].[Ba] NCJRLCWABWKAGX-UHFFFAOYSA-N 0.000 abstract description 2
- 229910052710 silicon Inorganic materials 0.000 abstract description 2
- 239000010703 silicon Substances 0.000 abstract description 2
- -1 silicon-aluminum-barium Chemical compound 0.000 abstract description 2
- 229910052788 barium Inorganic materials 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 229910000616 Ferromanganese Inorganic materials 0.000 description 1
- 229910000914 Mn alloy Inorganic materials 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 description 1
- PYLLWONICXJARP-UHFFFAOYSA-N manganese silicon Chemical compound [Si].[Mn] PYLLWONICXJARP-UHFFFAOYSA-N 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- C21C5/28—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
- C21C7/0025—Adding carbon material
-
- 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
-
- 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
Landscapes
- 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)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention discloses a process for deoxidizing screw-thread steel smelted by a converter, which comprises the steps of adding carbon powder under the condition of argon blowing to perform primary deoxidization before steel making of the converter reaches a final point; and during tapping, adding silicon carbide into molten steel for deoxidization, and finishing the addition within 120 seconds after tapping. The invention adopts carbon powder and silicon carbide to replace silicon-calcium-barium and silicon-aluminum-barium for deoxidizing molten steel. The carbon powder is pre-deoxidized, the silicon carbide contains silicon, and the deoxidizing capability is stronger than that of the carburant, so that the final deoxidization is performed. The carbon powder deoxidization product is CO gas, and most of the deoxidization products of silicon carbide are also CO gas, so that the sources of deoxidization inclusions can be reduced. When the screw steel is smelted in the converter, carbon powder is adopted for preliminary deoxidation under the argon blowing condition before tapping, and silicon carbide is adopted for final deoxidation of molten steel during tapping, so that the oxygen content before the molten steel is arranged on a continuous casting platform is less than 50ppm, the defects of subcutaneous bubbles, looseness and the like of a continuous casting blank are avoided, and the deoxidation cost is reduced.
Description
Technical Field
The invention relates to a converter steelmaking process, in particular to a converter smelting screw-thread steel deoxidization process.
Background
The converter steelmaking is an oxidation process, when oxygen is blown to a terminal point, the carbon content in molten steel is continuously reduced, when the carbon content of the terminal point is reduced to below 0.15%, a large amount of oxygen is dissolved in the molten steel along with the further reduction of the carbon content of the molten steel, and excessive oxygen is separated out to form oxide inclusions and bubbles when the molten steel is solidified, so that the quality of casting blanks and steel products is directly influenced. Therefore, it is required to reduce the endpoint oxygen content of the converter and deoxidize the molten steel during the converter steelmaking process. In the prior art, the deoxidization process is to add the Si-Ca-Ba and Si-Al-Ba for deoxidization firstly during tapping and then add other alloys, and the deoxidization effect is better, but the cost is higher.
Disclosure of Invention
The invention aims to provide a deoxidation process for converter smelting screw steel.
Specifically, a process for deoxidizing screw-thread steel by converter smelting, wherein carbon powder is added under the condition of argon blowing to perform primary deoxidization before converter steelmaking reaches the end point; and during tapping, adding silicon carbide into molten steel for deoxidization, and finishing the addition within 120 seconds after tapping.
The invention adopts carbon powder and silicon carbide to replace silicon-calcium-barium and silicon-aluminum-barium for deoxidizing molten steel. The carbon powder is pre-deoxidized, the silicon carbide contains silicon, and the deoxidizing capability is stronger than that of the carburant, so that the final deoxidization is performed. The carbon powder deoxidization product is CO gas, and most of the deoxidization products of silicon carbide are also CO gas, so that the sources of deoxidization inclusions can be reduced.
The carbon content of the end point of converter steelmaking is controlled to be 0.04-0.15%.
The addition amount of carbon powder is 0.25-1 kg/ton steel.
The adding time of the silicon carbide is 20 seconds after tapping, the adding amount is 0.35-0.65 kg/ton of steel, and the adding amount is specifically adjusted according to the terminal carbon.
The silicon carbide needs to be added within 120 seconds after tapping.
After tapping for 30 seconds, adding a carburant for carbureting to the molten steel was started. And specifically, calculating the addition amount of the carburant according to the carbon of the finished product of the threaded steel, the carbon of the converter endpoint and the carburant of the silicon-manganese alloy.
The carburant needs to be added within 60 seconds after tapping.
After adding the carburant, adding ferrosilicon, ferromanganese, vanadium and nitrogen and other alloys into the molten steel, and adding all the alloys when tapping is performed by 3/4.
According to the invention, argon is blown in the whole tapping process, stirring of molten steel is enhanced, CO gas is promoted to be discharged, and potential safety hazards caused by splashing of CO gas caused by the covering of the molten steel are prevented.
The method provided by the invention has the following advantages:
when the screw steel is smelted in the converter, carbon powder is adopted for preliminary deoxidation under the argon blowing condition before tapping, and silicon carbide is adopted for final deoxidation of molten steel during tapping, so that the oxygen content before the molten steel is arranged on a continuous casting platform is less than 50ppm, the defects of subcutaneous bubbles, looseness and the like of a continuous casting blank are avoided, and the deoxidation cost is reduced.
The deoxidization cost of carbon powder and silicon carbide is 4.6 yuan/ton, the deoxidization cost of ton steel is reduced to 2.2 yuan/ton, and the annual effect reaches 660 yuan according to 300 ten thousand tons of steel plants producing screw steel per year. In the prior art, si-Ca-Ba and Si-Al-Ba are used for deoxidization, and the deoxidization cost of ton steel is 6.8 yuan/ton. Therefore, by using the deoxidizing process disclosed by the invention, the deoxidizing cost is reduced, and the economic benefit of enterprises is effectively improved.
Detailed Description
1. And (3) carrying out end point control on molten steel in the converter steelmaking process, controlling the end point carbon of the converter steelmaking to be 0.04% -0.15%, and stopping tapping when the end point carbon is more than 0.15%.
2. Pouring the steel water into a molten steel tank before tapping, entering an argon blowing station, adding carbon powder under the argon blowing condition, and performing primary deoxidation. Carbon powder contains 85% -90% of carbon. The carbon powder addition amount is 0.5 kg/ton of steel, and then the addition amount of a 120 ton converter is 60 kg/ton. The argon blowing pressure of the molten steel tank is 0.2-0.8Mpa. After adding carbon powder, the molten steel tank is opened and returned to the furnace for waiting.
3. After tapping for 20 seconds, adding silicon carbide into molten steel for deoxidization, wherein the adding amount is 0.35kg-0.65 kg/ton of steel, and the adding is completed within 120 seconds after tapping.
After tapping for 30 seconds, adding carburant for increasing molten steel carbon is started, and the charging is completed within 60 seconds after tapping. The adding amount of the carburant is controlled to be 0.21-0.25% according to the carbon of the threaded steel finished product, the end point carbon of the converter is controlled to be 0.04-0.15%, the carburant of the silicomanganese alloy is carburated to be 0.02-0.03%, and the carburant for carburating is calculated. The carburant contains 94% -97% of carbon.
And adding ferrosilicon, manganese, vanadium and nitrogen and other alloys into the molten steel, and finishing all the alloys when tapping is performed by 3/4.
Argon is blown in the whole tapping process, namely argon is blown in the whole tapping process from the beginning of tapping to the argon blowing station of molten steel, the argon blowing pressure is 0.2-0.8Mpa, the molten steel is stirred, CO is promoted to be discharged, and potential safety hazards caused by splashing of the molten steel are avoided. Tapping of the converter adopts slag blocking operation, and the slag discharging amount is controlled below 50 mm.
4. After tapping, the molten steel enters an argon blowing station, and then component adjustment is carried out, and the soft argon blowing time is longer than 2 minutes.
The method is used for treating the molten steel in multiple batches, and the oxygen content of the molten steel discharged from an argon blowing station is less than or equal to 49.8ppm. The continuous casting billet has no defects of subcutaneous air bubbles, looseness and the like, and the quality meets the national standard requirement.
Proved by verification, the carbon hit rate of molten steel entering an argon blowing station is 99.58 percent, and the carbon hit rate of molten steel exiting the argon blowing station is 99.92 percent, which is equivalent to the prior art.
Claims (9)
1. The process for deoxidizing the screw-thread steel during converter smelting is characterized in that carbon powder is added under the condition of argon blowing to perform primary deoxidization before converter steelmaking reaches the end point; and during tapping, adding silicon carbide into molten steel for deoxidization, and finishing the addition within 120 seconds after tapping.
2. The process for deoxidizing threaded steel for converter smelting according to claim 1, wherein the terminal carbon content of the converter steelmaking is controlled to be 0.04% -0.15%.
3. The process for deoxidizing screw-thread steel for converter smelting according to claim 1, wherein the carbon powder is added in an amount of 0.25-1 kg/ton of steel.
4. The process for deoxidizing the screw-thread steel for converter smelting according to claim 1, wherein the adding time of the silicon carbide is 0.35-0.65 kg/ton of steel after tapping for 20 seconds, and the adding amount is specifically adjusted according to the terminal carbon.
5. The process for deoxidizing a screw-thread steel for converter smelting according to claim 1 or 4, wherein the silicon carbide is added within 120 seconds of tapping.
6. The process for deoxidizing a screw-threaded steel for converter smelting according to claim 5, wherein the tapping is started for 30 seconds, and a carburant for carburetion is added to the molten steel.
7. The process for deoxidizing a screw-thread steel for converter smelting according to claim 6, wherein the carburant is added within 60 seconds of tapping.
8. The process for deoxidizing the screw-thread steel smelted by the converter according to claim 6, wherein after the carburant is added, alloys such as ferrosilicon, silicomanganese, vanadium and nitrogen are added into molten steel, and all the alloys are added when tapping is performed by 3/4.
9. The process according to claim 1, wherein argon is blown during the whole tapping process to stir the molten steel and to promote the discharge of CO gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311337963.6A CN117363826A (en) | 2023-10-17 | 2023-10-17 | Deoxidation process for converter smelting screw-thread steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311337963.6A CN117363826A (en) | 2023-10-17 | 2023-10-17 | Deoxidation process for converter smelting screw-thread steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117363826A true CN117363826A (en) | 2024-01-09 |
Family
ID=89394050
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311337963.6A Pending CN117363826A (en) | 2023-10-17 | 2023-10-17 | Deoxidation process for converter smelting screw-thread steel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117363826A (en) |
-
2023
- 2023-10-17 CN CN202311337963.6A patent/CN117363826A/en active Pending
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |