CN114807492A - Method for reducing total oxygen of tundish of thick plate steel grade - Google Patents
Method for reducing total oxygen of tundish of thick plate steel grade Download PDFInfo
- Publication number
- CN114807492A CN114807492A CN202210438854.2A CN202210438854A CN114807492A CN 114807492 A CN114807492 A CN 114807492A CN 202210438854 A CN202210438854 A CN 202210438854A CN 114807492 A CN114807492 A CN 114807492A
- Authority
- CN
- China
- Prior art keywords
- blowing
- alloy
- argon
- tundish
- converter
- 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
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 41
- 239000001301 oxygen Substances 0.000 title claims abstract description 41
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 41
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 40
- 239000010959 steel Substances 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 24
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 37
- 239000000956 alloy Substances 0.000 claims abstract description 34
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 33
- 238000007664 blowing Methods 0.000 claims abstract description 28
- 229910052786 argon Inorganic materials 0.000 claims abstract description 19
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims abstract description 14
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 5
- 239000011575 calcium Substances 0.000 claims abstract description 5
- 239000007788 liquid Substances 0.000 claims abstract description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 23
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 23
- 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 claims description 18
- 238000010079 rubber tapping Methods 0.000 claims description 16
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 12
- 229910000592 Ferroniobium Inorganic materials 0.000 claims description 5
- QFGIVKNKFPCKAW-UHFFFAOYSA-N [Mn].[C] Chemical compound [Mn].[C] QFGIVKNKFPCKAW-UHFFFAOYSA-N 0.000 claims description 5
- 241000143432 Daldinia concentrica Species 0.000 claims description 4
- 238000005275 alloying Methods 0.000 claims description 4
- 229910001200 Ferrotitanium Inorganic materials 0.000 claims description 3
- -1 ferrophosphorus Inorganic materials 0.000 claims description 3
- 229910000604 Ferrochrome Inorganic materials 0.000 claims description 2
- 229910000720 Silicomanganese Inorganic materials 0.000 claims 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 8
- 229910052748 manganese Inorganic materials 0.000 description 8
- 239000011572 manganese Substances 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 6
- 238000003723 Smelting Methods 0.000 description 5
- XWHPIFXRKKHEKR-UHFFFAOYSA-N iron silicon Chemical compound [Si].[Fe] XWHPIFXRKKHEKR-UHFFFAOYSA-N 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- ZFGFKQDDQUAJQP-UHFFFAOYSA-N iron niobium Chemical compound [Fe].[Fe].[Nb] ZFGFKQDDQUAJQP-UHFFFAOYSA-N 0.000 description 2
- PYLLWONICXJARP-UHFFFAOYSA-N manganese silicon Chemical compound [Si].[Mn] PYLLWONICXJARP-UHFFFAOYSA-N 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- 229910000616 Ferromanganese Inorganic materials 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- JAWMENYCRQKKJY-UHFFFAOYSA-N [3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-ylmethyl)-1-oxa-2,8-diazaspiro[4.5]dec-2-en-8-yl]-[2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidin-5-yl]methanone Chemical compound N1N=NC=2CN(CCC=21)CC1=NOC2(C1)CCN(CC2)C(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F JAWMENYCRQKKJY-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000006467 substitution reaction Methods 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
- C21C7/0006—Adding metallic additives
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/072—Treatment with gases
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
Abstract
The invention discloses a method for reducing the total oxygen content of a tundish of a thick plate steel grade, which comprises the steps of controlling a converter to stop blowing free oxygen, adjusting a post-converter deoxidation process, optimizing an RH feeding mode and improving a post-wire feeding argon blowing mode, namely the oxygen blowing stopping index of the converter is set to be lower than 600ppm, adding an alloy after ferrosilicon deoxidation, controlling the addition of the alloy in the RH earlier stage to account for more than 70 percent of the total input amount, adjusting a soft blowing mode, firstly adjusting steel ladle argon blowing to achieve slight fluctuation of the liquid level of steel and no exposure of molten steel, then starting to feed a calcium wire, blowing argon in the whole wire feeding process, and continuing to blow argon for more than 6min after wire feeding is finished; the method can obviously reduce and stably control the oxygen content of the tundish of the thick plate steel grade, and has simple process, easy application and better popularization prospect.
Description
Technical Field
The invention belongs to the technical field of steel-making production, and particularly relates to a method for reducing the total oxygen of a tundish of a thick plate steel grade.
Background
The thick plate steel is widely used for manufacturing various pressure vessels, ship plates, pipelines and wind power equipment, wherein part of high flaw detection steel has strict requirements on the quantity and the size of oxide inclusions in steel, and the oxygen content in the steel needs to be controlled to reduce the content of the oxide inclusions.
At present, aluminum deoxidation is generally used in the production process of thick plate steel, aluminum is added into a steel ladle in the tapping process of a converter, oxygen in molten steel is removed by utilizing the reaction of the aluminum and the oxygen, and alloy such as carbon powder, ferrosilicon, electrolytic manganese and the like is added after the deoxidation is finished to adjust the components of the molten steel. The aluminum deoxidation has the advantages of high speed and complete deoxidation, but the aluminum deoxidation easily generates fine Al 2 O 3 Inclusions, fine Al 2 O 3 The inclusion is not easy to float upwards in molten steel, so that the oxygen content in the steel is high.
Disclosure of Invention
Aiming at the technical problems, the invention provides a method for reducing the total oxygen of a tundish of a thick plate steel grade, which adopts silicon deoxidation, promotes inclusions in molten steel to float upwards by controlling a converter to stop blowing free oxygen, adjusting a deoxidation process after the converter, optimizing an RH feeding mode, improving an argon blowing mode after wire feeding and the like, thereby reducing the total oxygen of the tundish and improving the purity of the molten steel.
Therefore, the invention provides a method for reducing the total oxygen of a tundish of a thick plate steel grade, which comprises the following steps:
1) stopping blowing oxygen, setting the oxygen blowing stopping target of the converter to be lower than 600ppm, and reducing the source of impurities from the source by reducing the oxygen blowing stopping target of the converter;
2) converter alloying: silicon deoxidation is adopted in converter tapping, ferrosilicon is added for pre-deoxidation after tapping for 1min, other alloys are added after tapping for 2min, and Al is effectively reduced by silicon deoxidation 2 O 3 The generation of inclusions generates silicon oxide which is easy to float;
3) RH alloying: adding a first batch of alloy after RH treatment for 2-4min, wherein the alloy amount accounts for more than or equal to 70% of the total amount, adding a second batch of alloy after RH treatment for 11-12min, wherein the alloy ratio is less than or equal to 30%, controlling the vacuum degree to be less than or equal to 266pa after the alloy addition is finished, and controlling the argon circular flow to be more than or equal to 180Nm3/h, so that the molten steel circulation efficiency is ensured, and the molten steel purity is improved;
4) adjusting a soft blowing mode: and adjusting the ladle to blow argon before feeding the calcium wire to achieve slight fluctuation of the liquid level of the steel, ensuring the effect of removing impurities contained in molten steel, preventing the increase of slag inclusion in the molten steel, feeding the wire after the argon is adjusted, blowing argon in the whole wire feeding process, and after the wire feeding is finished, the soft blowing time is more than or equal to 6 min.
Preferably, the other alloys in step 2) include one or more of high manganese, electrolytic manganese, tai-ai, si-fe, si-mn and mn-c spheres.
Preferably, the first alloy and the second alloy in the step 3) are one or more of table aluminum, carbon powder, ferrosilicon, electrolytic manganese, high manganese, ferroniobium, ferrophosphorus, ferrochrome and ferrotitanium.
Further optimizing the RH feeding mode, wherein the alloy feeding amount accounts for more than 70% of the total feeding amount in the early stage of RH treatment, and the alloy feeding in the later stage is reduced, so that the inclusions generated by adding the alloy have sufficient floating time.
Compared with the prior art, the invention has the beneficial effects that:
according to the method, by controlling the converter to stop blowing free oxygen, adjusting the post-converter deoxidation process, optimizing the RH feeding mode and improving the wire feeding post-argon blowing mode, the oxygen content of the tundish of the thick plate steel grade is obviously reduced, and the oxygen content of the tundish of the thick plate steel grade can be stably controlled. The invention has simple process and convenient operation.
Detailed Description
The following further describes a specific implementation manner of the technical solution of the present disclosure through specific examples, which are intended to describe the technical solution in detail, but not to limit the technical solution. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present description.
Example 1
Smelting in a converter with the nominal capacity of 350 tons, wherein the oxygen blowing of the converter is stopped to be 560ppm, 1202kg of ferrosilicon is added for deoxidation 1min after tapping, and 2008kg of high manganese, 3300kg of electrolytic manganese, 301kg of table aluminum and 801kg of manganese carbon balls are added after tapping for 3 min.
The treatment was carried out at RH with a nominal capacity of 350 tons, and 112kg of table aluminum, 111kg of carbon powder, 60kg of silicon iron and 520kg of electrolytic manganese (the addition amount is 79.3% of the total) were added 3min after the start of the treatment. 50kg of alloy carbon powder, 101kg of high manganese and 59kg of aluminum (the addition accounts for 20.7 percent of the total amount) are added after the treatment is carried out for 11min, the vacuum degree is controlled to be 133pa after the alloy is added, and the argon gas circulation flow is 183Nm 3/h. After the treatment, the wire is fed for 550m, soft blowing is carried out for 6.6min, and the total oxygen content of the tundish is detected to be 8 ppm.
Example 2
Smelting in a converter with the nominal capacity of 350 tons, stopping blowing oxygen in the converter for 547ppm, adding 996kg of ferrosilicon for deoxidation 1.5min after tapping, and adding 2003kg of high manganese, 3200kg of electrolytic manganese, 387kg of table aluminum and 797kg of manganese carbon balls 3.2min after tapping.
The treatment was carried out at RH with a nominal capacity of 350 tons, and 79kg of table aluminum, 120kg of carbon powder, 200kg of silicon iron and 780kg of high manganese (the addition amount is 87.6% of the total) were added 3.3min after the start of the treatment. After the treatment is carried out for 12min, 60kg of alloy carbon powder, 68kg of high manganese and 39kg of aluminum (the addition accounts for 12.4 percent of the total amount) are added, the vacuum degree of the alloy is controlled to be 142pa, and the argon circulation flow is 188Nm 3/h. After the treatment, the filaments were fed for 560m, soft-blown for 7.0min, and the tundish total oxygen content was measured at 6 ppm.
Example 3
Smelting in a converter with the nominal capacity of 350 tons, stopping blowing oxygen in the converter for 589ppm, adding 1103kg of ferrosilicon for deoxidation 1.3min after tapping, and adding 1998kg of high manganese, 3300kg of electrolytic manganese, 350kg of Taiwan aluminum and 798kg of manganese carbon balls 3.2min after tapping.
The treatment was carried out at RH with a nominal capacity of 350 tons, and 120kg of table aluminum, 130kg of carbon powder, 168kg of silicon iron and 668kg of high manganese (the addition amount is 77.3% of the total amount) were added at 3.3min from the start of the treatment. After the treatment is carried out for 12min, 44kg of alloy ferrosilicon, 250kg of high manganese and 25kg of aluminum (the addition accounts for 22.7 percent of the total amount) are added, the vacuum degree of the alloy is controlled to be 146pa, and the circular flow of argon is 180Nm 3/h. After the treatment, the filaments were fed for 550m, soft-blown for 6.1min, and the tundish total oxygen content was measured at 9 ppm.
Comparative example 1
Smelting in a converter with the nominal capacity of 350 tons, stopping blowing oxygen in the converter for 673ppm, adding 302kg of aluminum for deoxidation 2min after tapping, and adding 3289kg of metal manganese, 1930kg of silicon manganese and 759kg of silicon iron after tapping for 3.5 min.
The treatment was carried out at RH with a nominal capacity of 350 tons, and 69kg of Table aluminum, 61kg of carbon powder, 93kg of ferrocolumbium and 651kg of manganese (the addition amount is 20.9% of the total amount) were added for 2min from the start of the treatment. After the treatment for 11min, 2585kg of alloy scrap steel, 411kg of high manganese, 200kg of ferrosilicon, 59kg of carbon powder, 8kg of ferrotitanium and 32kg of aluminum (the addition accounts for 79.1 percent of the total amount) are added, the alloy vacuum degree is 185pa, and the circulation argon amount is 153Nm 3/h. After the treatment, 550m calcium filaments were fed, soft-blown for 6.3min, and the tundish total oxygen content was measured at 19 ppm.
Comparative example 2
Smelting in a converter with the nominal capacity of 350 tons, stopping blowing oxygen in the converter for 703ppm, adding 400kg of aluminum for deoxidation 1.5min after tapping, and adding 2548kg of low-carbon ferromanganese, 4065kg of silicon manganese, 197kg of ferrosilicon and 912kg of manganese-carbon balls after tapping for 3.3 min.
The treatment was carried out at RH with a nominal capacity of 350 tons, and 120kg of Table aluminum, 314kg of high manganese, 118kg of ferrocolumbium and 79kg of carbon powder (the addition amount is 49.3% of the total amount) were added for 1.5min from the start of the treatment. After the treatment for 11.5min, 101kg of ferrosilicon alloy, 348kg of high manganese, 59kg of carbon powder, 13kg of ferroniobium and 130kg of aluminum (the addition accounts for 50.7 percent of the total amount) are added, the vacuum degree is controlled to 188pa after the alloy is added, and the circulation argon flow is 155Nm 3/h. After the treatment, the steel wire is fed with 450m of calcium wires, soft blowing is carried out for 6.3min, and 18ppm of total oxygen in the tundish is detected.
The results of the oxygen content test in the tundish of examples 1 to 3 and comparative examples 1 to 2 are shown in Table 1.
TABLE 1 tundish total oxygen concentration
| Group of | Oxygen concentration (ppm) |
| Example 1 | 8 |
| Example 2 | 6 |
| Example 3 | 9 |
| Comparative example 1 | 19 |
| Comparative example 2 | 18 |
As can be seen from Table 1, the total oxygen concentrations of examples 1-3 are significantly lower than those of comparative examples 1-2. The method can effectively reduce the total oxygen concentration of the tundish of the thick plate steel grade.
The technology used by the invention is mature, no additional equipment or alloy materials are needed, the process is optimized on the basis of the original process, the operation skill is improved, and the technology can be practically applied. At present, the steel-making process is developed quite mature, the flow equipment of each large iron and steel enterprise is basically the same, and the process can be popularized in other steel plants and has good application prospect.
Although the embodiments of the present description have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations may be made in these embodiments without departing from the principles and spirit of the description, the scope of which is defined in the appended claims and their equivalents.
Claims (3)
1. A method for reducing the total oxygen of a tundish of a thick plate steel grade is characterized by comprising the following steps:
1) stopping blowing oxygen, wherein the index of stopping blowing oxygen of the converter is less than 600 ppm;
2) converter alloying: adding ferrosilicon for pre-deoxidation after tapping for 1min, and adding other alloys after tapping for 2 min;
3) RH alloying: adding a first batch of alloy after RH treatment is started for 2-4min, wherein the alloy amount accounts for more than or equal to 70% of the total amount, adding a second batch of alloy after RH treatment is carried out for 11-12min, wherein the alloy ratio is less than or equal to 30%, controlling the vacuum degree to be less than or equal to 266pa after the alloy addition is finished, and controlling the argon circular flow to be more than or equal to 180Nm 3/h;
4) adjusting a soft blowing mode: firstly, adjusting the argon blowing of the steel ladle to ensure that the liquid level of the steel fluctuates slightly and the molten steel is not exposed, then starting to feed a calcium wire, blowing argon in the whole wire feeding process, and continuing to blow the argon for more than 6min after wire feeding is finished.
2. The method for reducing the total oxygen content of the tundish of the thick plate steel grade according to claim 1, wherein the other alloys in the step 2) comprise one or more of high manganese, electrolytic manganese, Taiwan aluminum, ferrosilicon, silicomanganese and manganese carbon balls.
3. The method for reducing total oxygen in a tundish of a heavy plate steel grade according to claim 1, wherein the first and second alloys in step 3) are one or more of table aluminum, carbon powder, ferrosilicon, electrolytic manganese, high manganese, ferrocolumbium, ferrophosphorus, ferrochrome and ferrotitanium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210438854.2A CN114807492A (en) | 2022-04-21 | 2022-04-21 | Method for reducing total oxygen of tundish of thick plate steel grade |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210438854.2A CN114807492A (en) | 2022-04-21 | 2022-04-21 | Method for reducing total oxygen of tundish of thick plate steel grade |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114807492A true CN114807492A (en) | 2022-07-29 |
Family
ID=82507187
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210438854.2A Pending CN114807492A (en) | 2022-04-21 | 2022-04-21 | Method for reducing total oxygen of tundish of thick plate steel grade |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114807492A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102847903A (en) * | 2011-06-29 | 2013-01-02 | 鞍钢股份有限公司 | Method for manufacturing low-total-oxygen steel |
| JP2018168454A (en) * | 2017-03-30 | 2018-11-01 | Ｊｆｅスチール株式会社 | Production method of high cleanliness steel |
| CN114058786A (en) * | 2021-10-18 | 2022-02-18 | 首钢集团有限公司 | Alloying method in IF steel refining process |
-
2022
- 2022-04-21 CN CN202210438854.2A patent/CN114807492A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102847903A (en) * | 2011-06-29 | 2013-01-02 | 鞍钢股份有限公司 | Method for manufacturing low-total-oxygen steel |
| JP2018168454A (en) * | 2017-03-30 | 2018-11-01 | Ｊｆｅスチール株式会社 | Production method of high cleanliness steel |
| CN114058786A (en) * | 2021-10-18 | 2022-02-18 | 首钢集团有限公司 | Alloying method in IF steel refining process |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110747305B (en) | Converter steelmaking method for producing low-sulfur phosphorus-containing IF steel by using RH single-link process | |
| CN111621621B (en) | Control method of Mn in molten steel in RH vacuum treatment process | |
| CN113862428A (en) | Ultra-low carbon steel smelting method | |
| CN112143852A (en) | Smelting preparation method of high-cleanliness titanium-containing steel grade | |
| CN113652511A (en) | Smelting method for controlling nitrogen content in silicon-aluminum killed steel to be less than or equal to 0.0013% | |
| CN113088628A (en) | LF refining method of low-carbon steel | |
| EP0520085B1 (en) | Method of producing ultra-low-carbon steel | |
| CN114807492A (en) | Method for reducing total oxygen of tundish of thick plate steel grade | |
| CN108715913B (en) | Method for smelting 9Ni steel by electric furnace | |
| EP3674424B1 (en) | Smelting method for ultra-low carbon 13cr stainless steel | |
| CN108642239B (en) | Method for alloying molten steel silicon and treating calcium by using metal-containing calcium-silicon-iron alloy | |
| JP3002593B2 (en) | Melting method of ultra low carbon steel | |
| WO2022039036A1 (en) | Production method for high-manganese steel | |
| CN115404309B (en) | Molten steel deoxidizing method | |
| CN113355484B (en) | Ultra-low oxygen medium chromium ferrite stainless steel and smelting method thereof | |
| CN116356119B (en) | High-efficiency steelmaking nitrogen control method based on hydrogen-containing plasma blowing | |
| CN114790503B (en) | Smelting method with addition of iron ore | |
| CN114959169A (en) | Smelting method of steel for ultra-pure low-temperature container | |
| JP3594757B2 (en) | Melting method for high purity high Ni molten steel | |
| CN117625883A (en) | Ultra-low carbon steel production process adopting clean deoxidization mode | |
| CN115976299A (en) | Sulfur control processing method for die steel finished product | |
| JPH0841530A (en) | Production of low aluminum and low sulfur stainless steel | |
| JP3757435B2 (en) | Method for decarburizing and refining chromium-containing molten steel | |
| CN116179786A (en) | Smelting method of aluminum-free steel and preparation method thereof | |
| CN117363826A (en) | Deoxidation process for converter smelting screw-thread steel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |