CN114535555A - Method for reducing corrosion rate of ladle slag line in production of deformed steel bar - Google Patents
Method for reducing corrosion rate of ladle slag line in production of deformed steel bar Download PDFInfo
- Publication number
- CN114535555A CN114535555A CN202210172431.0A CN202210172431A CN114535555A CN 114535555 A CN114535555 A CN 114535555A CN 202210172431 A CN202210172431 A CN 202210172431A CN 114535555 A CN114535555 A CN 114535555A
- Authority
- CN
- China
- Prior art keywords
- ladle
- controlled
- percent
- slag
- content
- 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
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- 239000002893 slag Substances 0.000 title claims abstract description 38
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 24
- 239000010959 steel Substances 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 11
- 238000005260 corrosion Methods 0.000 title claims description 8
- 230000007797 corrosion Effects 0.000 title claims description 8
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 27
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 16
- 230000003628 erosive effect Effects 0.000 claims abstract description 11
- 238000010438 heat treatment Methods 0.000 claims abstract description 10
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 27
- 238000007664 blowing Methods 0.000 claims description 16
- 229910052786 argon Inorganic materials 0.000 claims description 14
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 7
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 6
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 6
- 239000004571 lime Substances 0.000 claims description 6
- 238000010079 rubber tapping Methods 0.000 claims description 4
- 239000006004 Quartz sand Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 238000007670 refining Methods 0.000 claims description 3
- 238000005275 alloying Methods 0.000 claims description 2
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 2
- 239000011449 brick Substances 0.000 abstract description 9
- 238000003723 Smelting Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052799 carbon Inorganic materials 0.000 abstract description 3
- 238000005187 foaming Methods 0.000 abstract description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract description 2
- 229910052593 corundum Inorganic materials 0.000 abstract description 2
- 238000004090 dissolution Methods 0.000 abstract description 2
- 238000010891 electric arc Methods 0.000 abstract description 2
- 229910001845 yogo sapphire Inorganic materials 0.000 abstract description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 20
- 229910052742 iron Inorganic materials 0.000 description 10
- 229910052681 coesite Inorganic materials 0.000 description 2
- 229910052906 cristobalite Inorganic materials 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 229910052682 stishovite Inorganic materials 0.000 description 2
- 229910052905 tridymite Inorganic materials 0.000 description 2
- 238000009749 continuous casting Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/02—Linings
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- 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
Abstract
The invention provides a method for reducing ladle slag line erosion rate in the production of deformed steel bar, which is to carry out ladle top slag Al2O3The content is controlled to be about 15 percent, the MgO content is controlled to be about 10 percent, (FeO + MnO) is controlled to be less than 2.6 percent, and the alkalinity (CaO/SiO)2) The control range is 1.8-2.0, the foaming performance of the ladle top slag can be effectively improved, the submerged arc effect is improved, the heating rate is increased, the smelting period is shortened, and the influence of electric arc on slag line bricks is reduced. In addition, by increasing the MgO content, the dissolution loss rate of magnesia in the slag line magnesia carbon brick can be effectively inhibited, the erosion rate of the slag line brick is reduced, and the ladle age of the steel ladle is increased.
Description
Technical Field
The invention relates to the field of metallurgy, in particular to a method for reducing the corrosion rate of a steel ladle slag line in the production of deformed steel bar.
Background
Under the background of 'carbon neutralization', the low molten iron specific energy can improve the steel yield and reduce the production cost, and is an effective method for improving the competitiveness of iron and steel enterprises. Under the condition of low molten iron ratio, the converter has insufficient heat, and the LF refining furnace needs to be heated and supplemented quickly. Under the condition of low molten iron ratio, the FeO content of converter final slag is high (15-22%), the foaming performance of ladle top slag is poor, submerged arc in the electrifying process is poor, the heating efficiency is low (average 2-3 ℃/min), the electrifying heating time is long, the smelting period is long, the erosion rate of a ladle slag line is increased, the leakage risk of a ladle is increased, and the performance of low iron consumption efficiency is severely restricted.
In summary, the following problems exist in the prior art: under the condition of low molten iron ratio (converter molten iron ratio: 730 kg/t-800 kg/t), the erosion rate of a ladle slag line is increased, and the risk of ladle leakage increases.
Disclosure of Invention
The invention provides a method for reducing the corrosion rate of a ladle slag line in the production of deformed steel bar, which aims to solve the problems that the corrosion rate of the ladle slag line is increased and the risk of ladle leakage is increased under the condition of low molten iron ratio.
Therefore, the invention provides a method for reducing the corrosion rate of a ladle slag line in the production of deformed steel bar, and ladle top slag Al is used2O3The content is controlled to be about 15 percent, the MgO content is controlled to be about 10 percent, (FeO + MnO) is controlled to be less than 2.6 percent, and the alkalinity (CaO/SiO)2) The control range is 1.8-2.0, the foaming performance of the ladle top slag can be effectively improved, the submerged arc effect is improved, the heating rate is increased, the smelting period is shortened, and the influence of electric arc on slag line bricks is reduced. In addition, by increasing the MgO content, the dissolution loss rate of magnesia in the slag line magnesia carbon brick can be effectively inhibited, the erosion rate of the slag line brick is reduced, and the ladle age is increased.
Detailed Description
The present invention will now be described in order to more clearly understand the technical features, objects, and effects of the present invention.
The ingredients of the materials added in the invention are shown in the table
Table 1 ingredients of materials charged
The method comprises the following specific steps:
step 1: adding 400-500kg lime and 500kg electric melting pre-melted slag into the steel for 30-60 s;
step 2: the strong argon blowing time in the argon station is more than 3 min; (e.g., 3.5 minutes or 4 minutes, argon blowing flow rate of 20 to 100m3/h)
And 3, step 3: butting a ladle bottom argon blowing pipe after the ladle enters the station;
and 4, step 4: after the molten steel reaches a treatment position, medium-pressure argon blowing is carried out to break slag, 300-400kg lime and 100-120kg light-burned magnesium oxide balls are added, and after medium-pressure argon blowing is carried out for 1-2min, soft blowing is carried out, and power is turned on for heating;
and 5: the medium-intensity argon blowing time is more than 3min after alloying;
step 6: adding 60-100kg of quartz sand 2min before the end of the last electrifying, wherein the soft blowing time is more than 3 min.
The effect is as follows:
1. the melting loss rate of the slag line bricks is reduced by 1.1mm per furnace;
2. the submerged arc effect is remarkably improved, the temperature rising efficiency is improved from 2-3 ℃/min to 4-5 ℃/min, and the smelting period is reduced from 42min to 35 min;
example 1: in the first half of 4 months in 2021, the process route for producing the deformed steel bar BOF-AR-LF-CC (BOF-converter, AR-argon station, LF-ladle refining furnace, CC-continuous casting machine), the content of ladle top slag (FeO + MnO) is 4.1%, and Al is2O3The content is 7.7 percent, the MgO content is 8 percent, the alkalinity (CaO/SiO2) is 1.37, the corrosion rate of the ladle slag line brick is 4.7 mm/furnace, and the heating rate is 2.2 ℃/min. The molten steel composition is shown in Table 2
TABLE 2 molten steel composition table (unit wt%)
(the conventional production process of the deformed steel bar is BOF-AR-CC, under the process condition, the tapping temperature of the converter is required to be high (1640-) 1660 ℃), the heat of the converter is seriously insufficient under the condition of low molten iron ratio, if the tapping temperature is increased to 1640-) 1660 ℃, all consumption indexes and the furnace condition safety of the converter can be greatly influenced, and the comprehensive cost is increased, so that the molten iron ratio of the converter is difficult to be 730-
The applicant adds 500kg lime and 500kg electric smelting pre-melted slag in the tapping process, adds 400kg lime and 110kg light-burned magnesia balls in the molten steel station, adds 60-100kg quartz sand 2min before the last electrifying is finished, and the soft blowing time is more than 3min (for example, 3.5 min). Steel ladle topSlag (FeO + MnO) content of 2.5%, Al2O3The content is 14.6 percent, the MgO content is 11.6 percent, the alkalinity (CaO/SiO2) is 1.85, the erosion rate of the ladle slag line brick is 3.6 mm/furnace, and the heating rate is 4.5 ℃/min. By adopting the method, the erosion rate can be reduced by 1.1 mm/furnace compared with the prior method; the heating efficiency is improved to 4.5 ℃/min from 2.2 ℃/min, the heating rate is improved by 2.2 ℃/min and is improved by more than 100 percent, and the smelting period is reduced to 35min from 42 min.
The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. In order that the components of the present invention may be combined without conflict, it is intended that all equivalent changes and modifications made by those skilled in the art without departing from the spirit and principles of the present invention shall fall within the protection scope of the present invention.
Claims (4)
1. A method for reducing the corrosion rate of a ladle slag line in the production of deformed steel bar is characterized by comprising the following steps:
after the materials are added into the ladle refining furnace, Al is added into the ladle top slag2O3The content is controlled to be 14-14.9%, the MgO content is controlled to be 9-13%, the FeO + MnO content is controlled to be below 2.6%, and the alkalinity (CaO/SiO)2) The control is in the range of 1.8-2.0.
2. The method for reducing the ladle slag line erosion rate in producing deformed steel bar according to claim 1, wherein the ladle top slag is Al-melted2O3The content is controlled to be 14.2-14.8 percent, the MgO content is controlled to be 10.8-12 percent, the FeO + MnO content is controlled to be 2.2-2.55 percent, and the alkalinity (CaO/SiO)2) The control is in the range of 1.82-1.9.
3. The method for reducing the ladle slag line erosion rate in producing deformed steel bar according to claim 2, wherein the ladle top slag is Al-melted2O3The content is controlled at 14.6 percent, the MgO content is controlled at 11.6 percent, the FeO + MnO content is controlled at 2.5 percent, and the alkalinity (CaO/SiO)2) The control is 1.85.
4. The method for reducing the ladle slag line erosion rate in the production of deformed steel bar according to claim 2, wherein the method for reducing the ladle slag line erosion rate in the production of deformed steel bar specifically comprises the following steps:
step A: after tapping begins, adding 400-500kg lime and 500kg electric melting pre-melted slag into a ladle in 30-60 s;
and B: the strong argon blowing time in the argon station is more than 3 min;
and C: butting a ladle bottom argon blowing pipe after the ladle enters the station;
step D: after the molten steel reaches a treatment position, medium-pressure argon blowing is carried out to break slag, 300-400kg lime and 100-120kg light-burned magnesium oxide balls are added, and after medium-pressure argon blowing is carried out for 1-2min, soft blowing is carried out, and power is turned on for heating;
step E: the medium-intensity argon blowing time is more than 3min after alloying;
step F: adding 60-100kg of quartz sand 2min before the end of the last electrifying, wherein the soft blowing time is more than 3 min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210172431.0A CN114535555B (en) | 2022-02-24 | 2022-02-24 | Method for reducing erosion rate of ladle slag line in production of deformed steel bar |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210172431.0A CN114535555B (en) | 2022-02-24 | 2022-02-24 | Method for reducing erosion rate of ladle slag line in production of deformed steel bar |
Publications (2)
| Publication Number | Publication Date |
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| CN114535555A true CN114535555A (en) | 2022-05-27 |
| CN114535555B CN114535555B (en) | 2023-11-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210172431.0A Active CN114535555B (en) | 2022-02-24 | 2022-02-24 | Method for reducing erosion rate of ladle slag line in production of deformed steel bar |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115287399A (en) * | 2022-08-10 | 2022-11-04 | 柳州钢铁股份有限公司 | Submerged arc optimization control process method for deformed steel bar LF furnace |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102409140A (en) * | 2010-09-26 | 2012-04-11 | 宝山钢铁股份有限公司 | Refined slag used in steel-making process for bearing steel |
| CN106222362A (en) * | 2016-07-22 | 2016-12-14 | 武汉钢铁股份有限公司 | A kind of method of refining of spring steel |
| CN110643779A (en) * | 2019-11-08 | 2020-01-03 | 马鞍山钢铁股份有限公司 | Ultra-low carbon steel top slag control production method |
| CN113403448A (en) * | 2021-06-29 | 2021-09-17 | 宝武集团鄂城钢铁有限公司 | Smelting method for quickly raising temperature of refining furnace under condition of low-alkalinity slag |
-
2022
- 2022-02-24 CN CN202210172431.0A patent/CN114535555B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102409140A (en) * | 2010-09-26 | 2012-04-11 | 宝山钢铁股份有限公司 | Refined slag used in steel-making process for bearing steel |
| CN106222362A (en) * | 2016-07-22 | 2016-12-14 | 武汉钢铁股份有限公司 | A kind of method of refining of spring steel |
| CN110643779A (en) * | 2019-11-08 | 2020-01-03 | 马鞍山钢铁股份有限公司 | Ultra-low carbon steel top slag control production method |
| CN113403448A (en) * | 2021-06-29 | 2021-09-17 | 宝武集团鄂城钢铁有限公司 | Smelting method for quickly raising temperature of refining furnace under condition of low-alkalinity slag |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115287399A (en) * | 2022-08-10 | 2022-11-04 | 柳州钢铁股份有限公司 | Submerged arc optimization control process method for deformed steel bar LF furnace |
| CN115287399B (en) * | 2022-08-10 | 2023-08-04 | 柳州钢铁股份有限公司 | Submerged arc optimal control process method for threaded steel LF furnace |
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| Publication number | Publication date |
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| CN114535555B (en) | 2023-11-24 |
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