CN114535555B - Method for reducing erosion rate of ladle slag line in production of deformed steel bar - Google Patents
Method for reducing erosion rate of ladle slag line in production of deformed steel bar Download PDFInfo
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- CN114535555B CN114535555B CN202210172431.0A CN202210172431A CN114535555B CN 114535555 B CN114535555 B CN 114535555B CN 202210172431 A CN202210172431 A CN 202210172431A CN 114535555 B CN114535555 B CN 114535555B
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- China
- Prior art keywords
- ladle
- controlled
- slag
- steel
- slag line
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- 239000002893 slag Substances 0.000 title claims abstract description 36
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 28
- 239000010959 steel Substances 0.000 title claims abstract description 28
- 230000003628 erosive effect Effects 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000004519 manufacturing process Methods 0.000 title abstract description 7
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 15
- 238000003723 Smelting Methods 0.000 claims abstract description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 23
- 229910052786 argon Inorganic materials 0.000 claims description 12
- 238000007664 blowing Methods 0.000 claims description 12
- 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
- 238000007670 refining Methods 0.000 claims description 4
- 238000010079 rubber tapping Methods 0.000 claims description 4
- 239000006004 Quartz sand Substances 0.000 claims description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 238000005275 alloying Methods 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 abstract description 10
- 239000011449 brick Substances 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 5
- 229910052799 carbon Inorganic materials 0.000 abstract description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 3
- 238000005187 foaming Methods 0.000 abstract description 3
- 238000004090 dissolution Methods 0.000 abstract description 2
- 238000010891 electric arc Methods 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 20
- 229910052742 iron Inorganic materials 0.000 description 10
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 238000005266 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
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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 erosion rate of ladle slag line in the production of screw steel, which comprises the steps of adding Al into ladle top slag 2 O 3 The content is controlled to be about 15 percent, the MgO content is controlled to be about 10 percent, (FeO+MnO) is controlled to be below 2.6 percent, and the alkalinity (CaO/SiO) 2 ) The control is in the range of 1.8-2.0, can effectively improve the foaming performance of ladle top slag, improve the submerged arc effect, increase the heating rate, shorten the smelting period and reduce the influence of electric arc on slag line bricks. In addition, by increasing the MgO content, the magnesia dissolution loss rate in the slag line magnesia carbon bricks can be effectively inhibited, the erosion rate of the slag line bricks can be reduced, and the ladle life can be increased.
Description
Technical Field
The invention relates to the field of metallurgy, in particular to a method for reducing erosion rate of a ladle slag line in the production of deformed steel bars.
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 steel enterprises. Under the condition of low molten iron ratio, the converter has insufficient heat, and the LF refining furnace needs to quickly heat up and supplement heat. Under the condition of low molten iron ratio, the FeO content of the final slag of the converter is higher (15-22%), the foaming performance of the top slag of the ladle is poorer, the submerged arc in the electrifying process is poorer, the heating efficiency is lower (average 2-3 ℃/min), the electrifying heating time is long, the smelting period is long, the erosion rate of the slag line of the ladle is increased, the risk of penetrating and leaking the ladle is increased, and the performance of low iron loss is seriously 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 ladle slag line is increased, and the risk of ladle penetration and leakage is increased.
Disclosure of Invention
The invention provides a method for reducing the erosion rate of a ladle slag line in the production of screw steel, which aims to solve the problems of increased erosion rate of the ladle slag line and increased risk of ladle penetration under the condition of low molten iron ratio.
Therefore, the invention provides a method for reducing the erosion rate of a ladle slag line for producing screw steel, which comprises the steps of adding ladle top slag Al 2 O 3 The content is controlled to be about 15 percent, the MgO content is controlled to be about 10 percent, (FeO+MnO) is controlled to be below 2.6 percent, and the alkalinity (CaO/SiO) 2 ) Can be controlled within 1.8-2.0The foaming performance of the ladle top slag is effectively improved, the submerged arc effect is improved, the heating rate is increased, the smelting period is shortened, and the influence of electric arcs on slag line bricks is reduced. In addition, by increasing the MgO content, the magnesia dissolution loss rate in the slag line magnesia carbon bricks can be effectively inhibited, the erosion rate of the slag line bricks can be reduced, and the ladle life can be increased.
Detailed Description
The present invention will now be described for a clearer understanding of technical features, objects, and effects of the present invention.
The invention relates to the ingredients of the added materials as shown in the following table
Table 1 ingredients of the materials added
The method comprises the following specific steps:
step 1: adding 400-500kg of lime and 500kg of electric melting premelted slag into the steel for 30-60 s;
step 2: the strong argon blowing time in the argon station is more than 3min; (e.g., 3.5 minutes or 4 minutes, argon blowing flow of 20-100 m) 3 /h)
Step 3: after entering the station, the steel ladle is well docked with a steel ladle bottom argon blowing pipe;
step 4: after molten steel is placed in a treatment position, strong argon is blown into the molten steel to break slag, 300-400kg of lime and 100-120kg of light burned magnesia balls are added, after the molten steel is strong blown for 1-2min, soft blowing is carried out, and the temperature is raised;
step 5: the strong argon blowing time is more than 3min after the alloying is finished;
step 6: and adding 60-100kg of quartz sand 2min before the last power-on is finished, wherein the soft blowing time is more than 3min.
The effect is as follows:
1. the melting loss rate of slag line bricks is reduced by 1.1 mm/furnace;
2. the submerged arc effect is obviously improved, the heating efficiency is improved from 2-3 ℃/min to 4-5 ℃/min, and the smelting period is reduced from 42min to 35min;
example 1: half month above 4 months 2021, the process route for producing screw steel is BOF-AR-LF-CC (BOF-converter, AR-argon station, LF-ladle refining furnace, CC-continuous)Casting machine), ladle top slag (FeO+MnO) content is 4.1%, al 2 O 3 The content is 7.7%, the MgO content is 8%, the alkalinity (CaO/SiO 2) is 1.37, the erosion rate of ladle slag line bricks is 4.7 mm/furnace, and the heating rate is 2.2 ℃/min. The molten steel composition is shown in Table 2
TABLE 2 Steel Water composition Table (unit wt%)
( The conventional production process of the screw-thread steel is BOF-AR-CC, under the process condition, the tapping temperature of the converter is required to be high (1640-1660 ℃), and under the condition of low molten iron ratio, the heat quantity of the converter is seriously insufficient, if the tapping temperature is increased to 1640-1660 ℃, various consumption indexes and the safety of the converter are greatly influenced, and the comprehensive cost is increased, so that the converter molten iron is difficult to be compared with 730-800kg/t under the process. Under the conditions of two-carbon strategy and limited electric yield, the lower the molten iron ratio is, the higher the steel yield is, and the greater the profit is )
The applicant adds 500kg lime and 500kg electric melting premelted 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 power-on is finished, and the soft blowing time is more than 3min (for example, 3.5 min). The content of the ladle top slag (FeO+MnO) is 2.5 percent, al 2 O 3 The content is 14.6%, the MgO content is 11.6%, the alkalinity (CaO/SiO 2) is 1.85, the erosion rate of ladle slag line bricks is 3.6 mm/furnace, and the heating rate is 4.5 ℃/min. The method can reduce the erosion rate by 1.1 mm/furnace compared with the prior erosion rate; the heating efficiency is improved from 2.2 ℃/min to 4.5 ℃/min, the heating rate is improved by 2.2 ℃/min, the heating period is improved by more than 100%, and the refining period is reduced from 42min to 35min.
The foregoing is illustrative of the present invention and is not to be construed as limiting the scope of the invention. In order that the components of the invention may be combined without conflict, any person skilled in the art shall make equivalent changes and modifications without departing from the spirit and principles of the invention.
Claims (2)
1. A method for reducing the erosion rate of a ladle slag line for producing screw-thread steel, which is characterized by comprising the following steps:
after the material is added into the ladle refining furnace in the station, the ladle top slag Al is added 2 O 3 The content is controlled to be 14.2-14.8%, the MgO content is controlled to be 10.8-12%, feO+MnO is controlled to be 2.2% -2.55%, and the alkalinity (CaO/SiO) 2 ) Controlling the temperature within the range of 1.82-1.9;
the method for reducing the erosion rate of the ladle slag line by producing the deformed steel bar specifically comprises the following steps:
step A: after tapping begins, 400-500kg lime and 500kg electric smelting premelting slag are added into the ladle within 30-60 s;
and (B) step (B): the strong argon blowing time in the argon station is more than 3min;
step C: after entering the station, the steel ladle is well docked with a steel ladle bottom argon blowing pipe;
step D: after molten steel is placed in a treatment position, strong argon is blown into the molten steel to break slag, 300-400kg of lime and 100-120kg of light burned magnesia balls are added, after the molten steel is strong blown for 1-2min, soft blowing is carried out, and the temperature is raised;
step E: the strong argon blowing time is more than 3min after the alloying is finished;
step F: and adding 60-100kg of quartz sand 2min before the last power-on is finished, wherein the soft blowing time is more than 3min.
2. The method for reducing erosion rate of ladle slag line for producing screw-thread steel according to claim 1, wherein the ladle top slag Al is as follows 2 O 3 The content is controlled to 14.6%, the MgO content is controlled to 11.6%, feO+MnO is controlled to 2.5%, and the alkalinity (CaO/SiO) 2 ) Controlled at 1.85.
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 |
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| Publication Number | Publication Date |
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| CN114535555A CN114535555A (en) | 2022-05-27 |
| CN114535555B true CN114535555B (en) | 2023-11-24 |
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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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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
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 |
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| CN114535555A (en) | 2022-05-27 |
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