CN114085956A - RH top gun powder injection desulfurization process for non-oriented silicon steel - Google Patents
RH top gun powder injection desulfurization process for non-oriented silicon steel Download PDFInfo
- Publication number
- CN114085956A CN114085956A CN202111444256.8A CN202111444256A CN114085956A CN 114085956 A CN114085956 A CN 114085956A CN 202111444256 A CN202111444256 A CN 202111444256A CN 114085956 A CN114085956 A CN 114085956A
- Authority
- CN
- China
- Prior art keywords
- powder injection
- oriented silicon
- silicon steel
- desulfurization process
- vacuum chamber
- 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.)
- Granted
Links
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 32
- 230000023556 desulfurization Effects 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000002347 injection Methods 0.000 title claims abstract description 31
- 239000007924 injection Substances 0.000 title claims abstract description 31
- 229910000976 Electrical steel Inorganic materials 0.000 title claims abstract description 24
- 239000003721 gunpowder Substances 0.000 title claims abstract description 19
- 239000000843 powder Substances 0.000 claims abstract description 59
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 48
- 238000005507 spraying Methods 0.000 claims abstract description 48
- 239000010959 steel Substances 0.000 claims abstract description 48
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 30
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000002245 particle Substances 0.000 claims abstract description 21
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 17
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 17
- 239000001301 oxygen Substances 0.000 claims abstract description 17
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 14
- 239000000956 alloy Substances 0.000 claims abstract description 14
- 238000005261 decarburization Methods 0.000 claims abstract description 9
- 238000005275 alloying Methods 0.000 claims abstract description 5
- 239000007788 liquid Substances 0.000 claims description 17
- 239000007789 gas Substances 0.000 claims description 14
- 238000003780 insertion Methods 0.000 claims description 3
- 230000037431 insertion Effects 0.000 claims description 3
- 238000009529 body temperature measurement Methods 0.000 claims description 2
- 238000007598 dipping method Methods 0.000 description 15
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 12
- 229910052717 sulfur Inorganic materials 0.000 description 12
- 239000011593 sulfur Substances 0.000 description 12
- 230000003009 desulfurizing effect Effects 0.000 description 8
- 238000007654 immersion Methods 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000007670 refining Methods 0.000 description 4
- 239000011449 brick Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- XWHPIFXRKKHEKR-UHFFFAOYSA-N iron silicon Chemical compound [Si].[Fe] XWHPIFXRKKHEKR-UHFFFAOYSA-N 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910000519 Ferrosilicon Inorganic materials 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 238000005262 decarbonization Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
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
- C21C7/10—Handling in a vacuum
-
- 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
- C21C7/0037—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 by injecting powdered 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
- C21C7/064—Dephosphorising; Desulfurising
-
- 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)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention provides a RH top lance powder injection desulfurization process for non-oriented silicon steel, wherein RH decarburization is finished, temperature and oxygen are measured, aluminum particles are immediately added for deoxidation and alloying, then alloy is immediately and continuously added for component adjustment, and top lance powder injection is immediately started after the alloy addition is finished; adding aluminum particles in an amount which is equal to the theoretical adding amount of the aluminum particles and 0.2-0.4kg/t steel; when powder spraying is carried out, the powder spraying speed is controlled to be matched with the circulating flow of the molten steel; the invention improves the RH desulphurization process with the top gun powder injection function from the aspects of desulphurization thermodynamics and kinetics under the vacuum condition, and improves the desulphurization rate.
Description
Technical Field
The invention belongs to the field of external refining, and particularly relates to a powder injection desulfurization process of non-oriented silicon steel RH top lance.
Background
Sulfur is a harmful element of non-oriented silicon steel and needs to be controlled within 20 ppm. Powder injection and desulfurization in an RH vacuum chamber are common means for producing non-oriented silicon steel, and mainly comprise RH-PB, RH-PTB and the like. Japanese sumitomo metal 160tRH blows 5-8kg/t desulfurizing agent, and [ S ] is reduced to below 5 ppm. However, the desulphurization effect of the RH with a top-gun powder injection device in many domestic steel mills does not reach the level reported in the literature, and the desulphurization effect is improved by improving the powder injection device, the injection position, the powder injection amount of a desulfurizer and the like, for example, Chinese invention patent CN112111625A, published 12, 22 in 2020, RH vacuum powder injection refining device and powder injection method thereof, and CN103966402A, published 7, 13 in 2016, RH vacuum refining system and desulphurization method for molten steel desulphurization. In order to improve the desulfurization rate and meet the production requirement of high-grade non-oriented silicon steel, the existing RH powder injection desulfurization process or control parameters need to be further improved.
Disclosure of Invention
The invention aims to provide a RH top gun powder injection desulfurization process for non-oriented silicon steel, which is characterized in that the RH desulfurization process with the top gun powder injection function is improved from the aspects of thermodynamics and kinetics of desulfurization under a vacuum condition by combining the characteristics of the non-oriented silicon steel, so that the desulfurization rate is improved.
The invention provides a RH top lance powder injection desulfurization process for non-oriented silicon steel, which comprises the following processes:
after RH decarburization is finished, temperature measurement and oxygen determination are carried out, aluminum particles are immediately added for deoxidation and alloying, then alloy is immediately and continuously added for component adjustment, and top lance powder injection is immediately started after the alloy addition is finished.
Adding the aluminum particles in an amount which is equal to the theoretical adding amount of the aluminum particles and 0.2-0.4kg/t steel.
The method for determining the theoretical addition amount of the aluminum particles comprises the following steps: and measuring the temperature and the oxygen after the RH decarburization is finished, and calculating the theoretical adding amount of the aluminum particles according to the oxygen determination result, the yield of the aluminum particles and the target [ Als ] content of the steel grade.
The amount of the added aluminum particles is that the amount of the aluminum particles of 0.2-0.4kg/t steel is added on the basis of calculating the theoretical addition of the aluminum particles, so that the loss of acid-soluble aluminum content in molten steel during powder spraying is compensated, the desulfurization reaction is carried out at low oxygen potential (below 2ppm of active oxygen), and the thermodynamic condition of the desulfurization reaction is ensured.
The top lance is used for spraying powder, and the lifting gas flow G is controlled to be 150-3The vacuum degree, namely the pressure P in the vacuum chamber is 3-15 kpa; setting the lance position H as 1500-.
Determining the height h of the molten pool liquid level in the vacuum chamber by the following 3 formulas0Molten steel circulation flow Q and powder spraying speed V.
h0＝(P0-P)/(ρg)-h1+h2(formula 1)
Q＝114G1/3×d4/3×[ln(P0/P)]1/3(formula 2)
V ═ (0.61-0.77) Q (formula 3)
In the above formulas:
h0-the bath level, m, in the vacuum chamber; p0-atmospheric pressure, taking 101300 Pa; p is the pressure in the vacuum chamber, Pa; rho-molten steel density, 7.0X 103kg/m3(ii) a g-take 9.8m/s2；h1-the distance from the bottom of the vacuum chamber to the lower end of the dip tube, m; h is2-the depth of insertion of the dip tube below the ladle level, m; q-molten steel circulation flow, t/min; g- -boost gas flow, Nm3Min; d- -dip tube inside diameter, m; v, powder spraying speed, kg/min;
wherein h is1、h2And d can be determined directly from the equipment used by the different manufacturers.
The above 3 formulas are calculated based on the values of the parameters at a given unit condition.
During the powder spraying period of the top lance, the circulating flow Q of the molten steel is 131-0Is 110mm-280mm, and the lance position H is set to be 1500-.
When the top lance is used for spraying powder, the powder spraying speed V is also required to be controlled to be matched with the molten steel circulation flow Q so as to ensure that the desulfurizing agent sprayed into the molten steel in unit time is matched with the amount of the molten steel which passes through the vacuum chamber and participates in the desulfurization reaction in unit time, thereby avoiding waste or insufficient consumption of the desulfurizing agent.
Since the molten steel circulation flow is under the combined action of the vacuum degree and the lifting gas flow, the powder spraying speed is actually set according to the lifting gas flow and the vacuum degree. The powder spraying speed of the top gun powder spraying is 80-130 kg/min. Furthermore, the specific powder spraying speed can be calculated according to the actual flow rate and vacuum degree of the lifting gas and the formula, and a process card is formulated in a grading mode to guide field operation.
The design idea of the RH top gun powder spraying desulfurization process of the non-oriented silicon steel is that the operation from the beginning of aluminum adding deoxidation alloying to the end of powder spraying is continuous, namely, the alloy is immediately added for component adjustment after the aluminum adding is finished, and the top gun powder spraying is immediately started after the alloy is added; the desulfurizer sprayed into the molten steel in unit time is matched with the amount of the molten steel passing through the vacuum chamber in unit time, after the process is applied, the treatment time can be shortened by 9-14 minutes, the temperature drop in the process is reduced by 13-21 ℃, the thermodynamic conditions of low oxygen potential and high temperature and good kinetic conditions of desulfurization reaction are ensured, and the RH average desulfurization rate reaches over 75 percent.
Drawings
FIG. 1 is a schematic diagram of the liquid level and the lance position of a molten pool in an RH vacuum chamber;
liquid level h of molten pool in RH vacuum chamber0The distance h from the bottom of the vacuum chamber to the lower port of the dip pipe1The depth h of the dip pipe inserted below the liquid level of the steel ladle2And the gun position H is the distance from the outlet of the top gun head to the brick surface at the bottom of the vacuum chamber.
Detailed Description
The production process flow of the non-oriented silicon steel molten steel comprises the following steps: molten iron pre-desulfurization → top and bottom combined blown converter smelting → RH refining → slab continuous casting, wherein, the implementation mode of the RH top lance powder injection desulfurization process is as follows:
1) and (3) after the molten steel reaches RH, decarbonizing for 8-15min according to the operation rule of the corresponding steel grade, measuring the temperature and determining the oxygen when the decarbonization is finished, and immediately adding aluminum particles for deoxidation alloying. Wherein, the adding amount of the aluminum particles is equal to the theoretical adding amount of the aluminum particles and is 0.2-0.4kg/t steel. The theoretical adding amount W of the aluminum particles is determined according to the oxygen determination result, the aluminum particle yield and the steel grade target [ Als ]]Calculated for the content, the theoretical amount W of aluminum particles added is (1.125 × [ O ]]×10-3+[Als]X 10) ÷ η, where W is in the unitkg/t steel, [ O ]]Is the constant oxygen value, unit ppm; [ Als ]]Is a molten steel target [ Als]In units%; eta is yield, and 74 percent is taken. The formula is calculated based on the value of the parameter at a given unit condition.
2) And (3) after the aluminum addition is finished, sequentially and continuously adding alloys such as silicon iron and the like for component adjustment, and after the alloy addition is finished, immediately starting top gun powder spraying. In the invention, the inner diameter of the used immersion pipe is 750mm, and the lance position H (the distance between the outlet of the top lance head and the brick surface at the bottom of the vacuum chamber) is 1500-2500 mm. The vacuum degree P is 3-15kpa during powder spraying, and the lift gas flow G is 150-180Nm3H, the distance h from the bottom of the vacuum chamber to the lower end of the dip tube11650mm, the depth h of the immersion tube inserted below the liquid level of the ladle2500mm, vacuum chamber molten pool liquid level h0Is 110mm-280 mm.
Calculated according to the following formula
h0＝(P0-P)/(ρg)-h1+h2(formula 1)
Q＝114G1/3×d4/3×[ln(P0/P)]1/3(formula 2)
V ═ (0.61-0.77) Q (formula 3)
In the above formulas:
h0-the bath level, m, in the vacuum chamber; p0-atmospheric pressure, taking 101300 Pa; p is the pressure in the vacuum chamber, Pa; rho-molten steel density, 7.0X 103kg/m3(ii) a g-take 9.8m/s2；h1-the distance from the bottom of the vacuum chamber to the lower end of the dip tube, m; h is2-the depth of insertion of the dip tube below the ladle level, m; q-molten steel circulation flow, t/min; g- -boost gas flow, Nm3Min; d- -dip tube inside diameter, m; v is the powder spraying speed, kg/min.
The circulating flow Q of the molten steel during powder spraying is 131-170t/min, and the powder spraying speed V is 80-130 kg/min. The total powder spraying amount is 400-1000 kg/furnace, which is determined according to the initial sulfur content.
4) And after the powder spraying is finished, operating according to the operation rules of the corresponding steel grades until the blank is obtained.
Example 1
A process for desulfurizing non-oriented silicon steel by RH top-gun powder spraying features that 300tRH mm of dipping tube is used, the internal diameter of dipping tube is 750mm, and the distance between the bottom of vacuum chamber and lower end of dipping tube is h11650mm, the depth h of the immersion tube inserted below the liquid level of the ladle2Is 500mm, and specifically comprises: initial sulfur content of RH molten steel 0.0034%, target [ Als ]]The content is 0.85%, active oxygen is 352ppm after RH decarburization is finished, aluminum is added for deoxidation at 12.32kg/t steel, alloy such as ferrosilicon is continuously added for component adjustment immediately after aluminum addition is finished, top lance powder injection is started immediately after the alloy addition is finished, and the lance position H is 2500mm (the distance from the lance head outlet of the top lance to the brick surface at the bottom of the vacuum chamber). During powder spraying, the vacuum degree P is 12kpa, and the lift gas flow G is 170Nm3The circulation flow Q of the molten steel is 142t/min, and the height of the liquid level of a molten pool in a vacuum chamber is 152 mm; the powder spraying speed V is 102kg/min, and the total powder spraying amount is 752 kg/furnace. The RH endpoint sulfur content was 0.00070%, and the desulfurization rate was 79.4%.
Example 2
A process for desulfurizing non-oriented silicon steel by RH top-gun powder spraying features that 300tRH mm of dipping tube is used, the internal diameter of dipping tube is 750mm, and the distance between the bottom of vacuum chamber and lower end of dipping tube is h11650mm, the depth h of the immersion tube inserted below the liquid level of the ladle2Is 500 mm; the method specifically comprises the following steps: initial sulfur content of RH molten steel is 0.0029%, target [ Als%]The content of the active oxygen is 0.85 percent, the active oxygen is 434ppm after RH decarburization is finished, 12.44kg/t of aluminum is added for deoxidation, and top lance powder injection is started immediately after the components are adjusted. The gun position H is 2000 mm. During powder spraying, the vacuum degree P is 10kpa, and the lift gas flow G is 150Nm3The circulation flow Q of the molten steel is 139t/min, and the height of the liquid level of a molten pool in a vacuum chamber is 181 mm; the powder spraying speed V is 93kg/min, and the total powder spraying amount is 659 kg/furnace. The RH end point sulfur content was 0.00063%, and the desulfurization rate was 78.3%.
Example 3
A process for desulfurizing non-oriented silicon steel by RH top-gun powder spraying features that 300tRH mm of dipping tube is used, the internal diameter of dipping tube is 750mm, and the distance between the bottom of vacuum chamber and lower end of dipping tube is h11650mm, the depth h of the immersion tube inserted below the liquid level of the ladle2Is 500mm, and specifically comprises: initial sulfur content of RH molten steel is 0.0023%, active oxygen is 439ppm at RH decarburization end, target [ Als]The content of the aluminum is 0.85 percent, and 12.45kg/t steel is added with aluminumDeoxidizing, regulating components, and immediately spraying powder with top gun. The gun position H is 2000 mm. During powder spraying, the vacuum degree P is 8kpa, and the lift gas flow G is 170Nm3H, the circulating flow Q of the molten steel is 150t/min, and the height of the liquid level of a molten pool in a vacuum chamber is 210 mm; the powder spraying speed V is 113kg/min, and the total powder spraying amount is 749 kg/furnace. The RH end point sulfur content was 0.00056% and the desulfurization rate was 75.6%.
Comparative example 1
A process for desulfurizing non-oriented silicon steel by RH top-gun powder spraying features that 300tRH mm of dipping tube is used, the internal diameter of dipping tube is 750mm, and the distance between the bottom of vacuum chamber and lower end of dipping tube is h11650mm, the depth h of the immersion tube inserted below the liquid level of the ladle2Is 500mm, and specifically comprises: initial sulfur content of RH molten steel is 0.0024%, target [ Als%]The content is 0.85 percent, the active oxygen is 439ppm after RH decarburization is finished, 12.15kg/t of aluminum is added for deoxidation circulation for 4-6min, the alloy such as silicon iron is added for adjusting the components, and top gun powder injection is started after circulation for 4-6 min. The gun position is 3000 mm. During powder spraying, the vacuum degree is 8kpa, and the lift gas flow is 170Nm3The circulation flow of the molten steel is 150t/min, and the height of the liquid level of a molten pool in a vacuum chamber is 210 mm; the powder spraying speed is 130kg/min, and the total powder spraying amount is 1009 kg/furnace. The RH end point sulfur content is 0.0014%, and the desulfurization rate is 41.6%.
Comparative example 2
A process for desulfurizing non-oriented silicon steel by RH top-gun powder spraying features that 300tRH mm of dipping tube is used, the internal diameter of dipping tube is 750mm, and the distance between the bottom of vacuum chamber and lower end of dipping tube is h11650mm, the depth h of the immersion tube inserted below the liquid level of the ladle2Is 500mm, and specifically comprises: initial sulfur content of RH molten steel 0.0034%, target [ Als ]]The content is 0.85%, active oxygen 319ppm is obtained after RH decarburization is finished, 11.97kg/t of steel is added for deoxidation, alloy such as silicon iron and the like is added for adjusting components after circulation is carried out for 5min, and top-gun powder injection is started after circulation is carried out for 7 min. The gun position is 3000 mm. During powder spraying, the vacuum degree is 12kpa, and the lift gas flow is 180Nm3The circulation flow of the molten steel is 144t/min, and the height of the liquid level of a molten pool in a vacuum chamber is 152 mm; the powder spraying speed is 132kg/min, and the total powder spraying amount is 1105 kg/furnace. The RH end point sulfur content is 0.0016%, and the desulfurization rate is 52.9%.
Claims (7)
1. The non-oriented silicon steel RH top lance powder injection desulfurization process is characterized by comprising the following control methods:
after RH decarburization is finished, temperature measurement and oxygen determination are carried out, aluminum particles are immediately added for deoxidation and alloying, then alloy is immediately and continuously added for component adjustment, and top lance powder injection is immediately started after the alloy addition is finished.
2. The RH top-gun powder injection desulfurization process for non-oriented silicon steel according to claim 1, wherein the amount of added aluminum particles is equal to the theoretical amount of added aluminum particles +0.2-0.4kg/t steel.
3. The RH top lance powder injection desulfurization process for non-oriented silicon steel as claimed in claim 1 or 2, wherein the top lance powder injection is carried out by controlling the lift gas flow G to be 150-180Nm3The vacuum degree, i.e. the pressure P in the vacuum chamber, is 3-15 kpa.
4. The RH top-lance powder injection desulfurization process for non-oriented silicon steel according to claim 1 or 2, wherein the height h of the molten pool liquid level in the vacuum chamber is determined by the following 3 formulas0Molten steel circulation flow Q and powder spraying speed V.
h0＝(P0-P)/(ρg)-h1+h2(formula 1)
Q＝114G1/3×d4/3×[ln(P0/P)]1/3(formula 2)
V ═ (0.61-0.77) Q (formula 3)
In the above formulas:
h0-the bath level, m, in the vacuum chamber; p0-atmospheric pressure, taking 101300 Pa; p is the pressure in the vacuum chamber, Pa; rho-molten steel density, 7.0X 103kg/m3(ii) a g-take 9.8m/s2；h1-the distance from the bottom of the vacuum chamber to the lower end of the dip tube, m; h is2-the depth of insertion of the dip tube below the ladle level, m;
q-molten steel circulation flow, t/min; g- -boost gas flow, Nm3Min; d- -dip tube inside diameter, m; v is the powder spraying speed, kg/min.
5. The RH top lance powder injection desulfurization process for non-oriented silicon steel as set forth in claim 4, wherein the molten steel circulation flow Q is 131-0Is 110mm-280 mm.
6. The RH top-gun powder spraying desulfurization process for non-oriented silicon steel according to claim 4, wherein the powder spraying speed is 80-130 kg/min.
7. The RH top lance powder injection desulfurization process for non-oriented silicon steel as claimed in claim 1, wherein the lance height H is set to 1500-.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111444256.8A CN114085956B (en) | 2021-11-30 | 2021-11-30 | Non-oriented silicon steel RH top gun powder spraying desulfurization process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111444256.8A CN114085956B (en) | 2021-11-30 | 2021-11-30 | Non-oriented silicon steel RH top gun powder spraying desulfurization process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114085956A true CN114085956A (en) | 2022-02-25 |
| CN114085956B CN114085956B (en) | 2023-11-03 |
Family
ID=80306000
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111444256.8A Active CN114085956B (en) | 2021-11-30 | 2021-11-30 | Non-oriented silicon steel RH top gun powder spraying desulfurization process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114085956B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115369206A (en) * | 2022-09-15 | 2022-11-22 | 马鞍山钢铁股份有限公司 | Inclusion control method for reducing sand hole defect |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101063179A (en) * | 2006-04-28 | 2007-10-31 | 金弘熙 | Method for prolonging retention period of molten steel in RH vacuum groove |
| CN105256106A (en) * | 2015-11-20 | 2016-01-20 | 山东钢铁股份有限公司 | RH refining device |
| CN111206137A (en) * | 2020-03-02 | 2020-05-29 | 马鞍山钢铁股份有限公司 | Method for stably controlling low titanium content in high-grade non-oriented silicon steel produced by high-titanium molten iron |
| CN111349758A (en) * | 2020-04-22 | 2020-06-30 | 马鞍山钢铁股份有限公司 | Method for improving castability of non-oriented silicon steel molten steel of CSP production line |
| CN112662945A (en) * | 2020-12-04 | 2021-04-16 | 马鞍山钢铁股份有限公司 | Control method for improving silicon content stability of high-grade non-oriented silicon steel |
-
2021
- 2021-11-30 CN CN202111444256.8A patent/CN114085956B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101063179A (en) * | 2006-04-28 | 2007-10-31 | 金弘熙 | Method for prolonging retention period of molten steel in RH vacuum groove |
| CN105256106A (en) * | 2015-11-20 | 2016-01-20 | 山东钢铁股份有限公司 | RH refining device |
| CN111206137A (en) * | 2020-03-02 | 2020-05-29 | 马鞍山钢铁股份有限公司 | Method for stably controlling low titanium content in high-grade non-oriented silicon steel produced by high-titanium molten iron |
| CN111349758A (en) * | 2020-04-22 | 2020-06-30 | 马鞍山钢铁股份有限公司 | Method for improving castability of non-oriented silicon steel molten steel of CSP production line |
| CN112662945A (en) * | 2020-12-04 | 2021-04-16 | 马鞍山钢铁股份有限公司 | Control method for improving silicon content stability of high-grade non-oriented silicon steel |
Non-Patent Citations (2)
| Title |
|---|
| 冯聚和等: "《铁水预处理与钢水炉外精炼》", vol. 1, 北京：冶金工业出版社, pages: 117 - 118 * |
| 刘向东等: "RH一体式浸渍管真空槽结构与优化", 《工业加热》, vol. 46, no. 1, 28 February 2017 (2017-02-28), pages 62 - 64 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115369206A (en) * | 2022-09-15 | 2022-11-22 | 马鞍山钢铁股份有限公司 | Inclusion control method for reducing sand hole defect |
| CN115369206B (en) * | 2022-09-15 | 2023-10-27 | 马鞍山钢铁股份有限公司 | Inclusion control method for reducing sand hole defect |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114085956B (en) | 2023-11-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8262767B2 (en) | Method of producing steel for steel pipe excellent in sour-resistance performance | |
| CN112899440A (en) | RH nitrogen-blowing alloying process for accurately controlling nitrogen content of nitrogen-containing steel | |
| CN103334050A (en) | Process utilizing sheet billet continuous casting to manufacture low aluminum silicon calm carbon structural steel | |
| JP5950133B2 (en) | Hot metal pretreatment method | |
| CN103088187B (en) | Method of producing steel | |
| CN105624367B (en) | The purifier and method of a kind of control nitrogen content of molten steel | |
| CN114085956A (en) | RH top gun powder injection desulfurization process for non-oriented silicon steel | |
| CN110551867A (en) | Converter smelting control method based on slag component prediction | |
| CN110982984A (en) | Production process of Al deoxidized non-calcium treated steel | |
| CN114672718A (en) | Smelting method of high-grade silicon steel | |
| CN111705178A (en) | Method for controlling oxygen content in molten steel RH vacuum refining furnace | |
| JP2004277830A (en) | Steelmaking method in converter | |
| CN115652029B (en) | Control method for sulfur content of deep drawing steel | |
| JP2005015890A (en) | Method for producing low-carbon high-manganese steel | |
| CN115161434B (en) | Production method of low alloy steel | |
| JP7269485B2 (en) | Melting method of high nitrogen stainless molten steel | |
| JP4277741B2 (en) | Method for melting nitrogen-containing steel | |
| CN117363830A (en) | Control method for improving castability of special-shaped blank silicon-killed steel molten steel | |
| JP2000239729A (en) | Production of extra-low carbon steel excellent in cleanliness | |
| JP2022105886A (en) | Refining method | |
| JP2022105879A (en) | Refining method | |
| JP2019167561A (en) | Method of temperature increase of molten steel | |
| CN115323102A (en) | Converter smelting method for efficiently smelting aluminum killed steel by using RH | |
| CN117660716A (en) | Smelting method of microalloyed high-strength steel with low hydrogen induced crack sensitivity | |
| CN117431455A (en) | Non-oriented silicon steel external refining process |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |