CN116855816A - Steelmaking method of ultralow-carbon high-alloy steel - Google Patents
Steelmaking method of ultralow-carbon high-alloy steel Download PDFInfo
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- CN116855816A CN116855816A CN202310857683.1A CN202310857683A CN116855816A CN 116855816 A CN116855816 A CN 116855816A CN 202310857683 A CN202310857683 A CN 202310857683A CN 116855816 A CN116855816 A CN 116855816A
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- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 27
- 229910000851 Alloy steel Inorganic materials 0.000 title claims abstract description 26
- 238000009628 steelmaking Methods 0.000 title claims abstract description 10
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 50
- 239000001301 oxygen Substances 0.000 claims abstract description 50
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical group [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 49
- 238000007664 blowing Methods 0.000 claims abstract description 30
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 26
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 24
- 238000009749 continuous casting Methods 0.000 claims abstract description 24
- 239000010959 steel Substances 0.000 claims abstract description 24
- 238000005266 casting Methods 0.000 claims abstract description 23
- 239000003607 modifier Substances 0.000 claims abstract description 23
- 238000010079 rubber tapping Methods 0.000 claims abstract description 21
- 239000002893 slag Substances 0.000 claims abstract description 16
- 230000008569 process Effects 0.000 claims abstract description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000004519 manufacturing process Methods 0.000 claims abstract description 11
- 229910000914 Mn alloy Inorganic materials 0.000 claims abstract description 9
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 7
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 7
- 229910052742 iron Inorganic materials 0.000 claims abstract description 7
- 239000004571 lime Substances 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims abstract description 7
- 229910000975 Carbon steel Inorganic materials 0.000 claims abstract description 5
- 238000005261 decarburization Methods 0.000 claims description 10
- 229910045601 alloy Inorganic materials 0.000 claims description 9
- 239000000956 alloy Substances 0.000 claims description 9
- 239000011572 manganese Substances 0.000 claims description 8
- 229910052782 aluminium Inorganic materials 0.000 claims description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 7
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 6
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 6
- 239000000292 calcium oxide Substances 0.000 claims description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 6
- 238000002844 melting Methods 0.000 claims description 5
- 230000008018 melting Effects 0.000 claims description 5
- 238000003825 pressing Methods 0.000 claims description 5
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 4
- 229910052748 manganese Inorganic materials 0.000 claims description 4
- 230000002159 abnormal effect Effects 0.000 claims description 3
- 238000007872 degassing Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 3
- 230000004048 modification Effects 0.000 claims description 3
- 238000012986 modification Methods 0.000 claims description 3
- 230000035699 permeability Effects 0.000 claims description 3
- 238000005502 peroxidation Methods 0.000 claims description 3
- 239000002912 waste gas Substances 0.000 claims description 3
- 206010039897 Sedation Diseases 0.000 claims description 2
- 230000004907 flux Effects 0.000 claims description 2
- 230000036280 sedation Effects 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 235000007164 Oryza sativa Nutrition 0.000 abstract description 3
- 235000009566 rice Nutrition 0.000 abstract description 3
- 238000007670 refining Methods 0.000 abstract description 2
- 240000007594 Oryza sativa Species 0.000 abstract 1
- 239000002904 solvent Substances 0.000 abstract 1
- 241000209094 Oryza Species 0.000 description 2
- 229910000629 Rh alloy Inorganic materials 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 2
- 230000001914 calming effect Effects 0.000 description 2
- 239000010903 husk Substances 0.000 description 2
- 230000024121 nodulation Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002926 oxygen Chemical class 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 230000002936 tranquilizing effect Effects 0.000 description 1
- 238000009489 vacuum treatment Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- 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
- C21C5/36—Processes yielding slags of special composition
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
-
- 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
- C21C7/068—Decarburising
-
- 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
-
- 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)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention relates to the technical field of steelmaking refining and continuous casting, and particularly discloses a steelmaking method of ultralow-carbon high-alloy steel, which comprises the following steps of: 1) Controlling the tapping temperature and the terminal oxygen content of the converter, and adding lime, group solvent and manganese alloy in the tapping process; 2) Immediately adding a modifier after tapping of the converter, and controlling the content of total iron TFe in the steel slag; 3) Controlling RH to-station oxygen content and to-station temperature; 4) After RH vacuum is finished, standing for not less than 10min after molten steel treatment is finished, and not opening soft blowing; 5) The whole-course protection casting is adopted in the continuous casting process, and the casting residue of a continuous casting machine is controlled; 6) The ladle is special, the ladle for producing plain carbon steel or low alloy steel by the last furnace cannot be used, and the ladle added with rice hulls cannot be used; the invention improves the continuous casting furnace number of the ultra-low carbon high alloy steel, improves the furnace number from 3 furnaces controlled in the past to 10 furnaces, reduces the using amount of a tundish, reduces the consumption of steel materials in whole casting times, and comprehensively reduces the production cost.
Description
Technical Field
The invention relates to the technical field of steelmaking refining and continuous casting, in particular to a steelmaking method of ultralow-carbon high-alloy steel.
Background
The ultra-low carbon steel high alloy steel is a steel grade with the finished product C content less than or equal to 0.0030 percent and the Mn content of 0.30-1.0 percent, and adopts a deep decarburization mode of adding alloy and RH in a converter in the smelting process, and is widely used for cold rolled flat steel and galvanized products with the thickness of 0.3-2.5mm at present. The traditional process method is to make the converter high oxygen position ([ O)]=600-800 ppm), end temperature 1670-1690 deg.C tapping, adding slag, adding modifier for deoxidizing and modifying slag, vacuum treating in RH vacuum furnace, and natural reaction of carbon and oxygen to reduce carbon content of steel, and RH forced oxygen blowing (oxygen blowing amount of 30-98 m) 3 ) Decarburizing to remove carbon below 0.0030%, adding alloy in RH vacuum treatment, adding Mn alloy in place, breaking the blank, tranquilizing for 30-40min, and casting.
The ultra-low carbon high alloy steel has the difficulty that long casting time continuous casting cannot be realized, the temperature reduction in the process is mainly caused by adding a manganese alloy into RH, the molten steel is insufficient in calming time, aluminum inclusions cannot float sufficiently, molten steel is easy to flocculate and flow in the casting process of a continuous casting machine, and a water gap can only be replaced to avoid nodulation; meanwhile, because the RH treatment time is about 45min, the casting period of the continuous casting machine is 26-35min, the continuous casting machine can only carry out short casting secondary production within 3 furnaces or continuous casting with other similar steel types, and the single-furnace single-machine long casting secondary production cannot be realized. Therefore, there is an urgent need to design a steelmaking method of ultra-low carbon high alloy steel to solve the problem that the continuous casting for long casting times can not be realized in the existing smelting of ultra-low carbon high alloy steel.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention aims to provide a steel-making method for ultra-low carbon high alloy steel.
The technical scheme adopted for solving the technical problems is as follows: a steelmaking method of ultra-low carbon high alloy steel comprises the following steps:
1) Controlling the tapping temperature and the terminal oxygen content of the converter, and adding lime, fluxing agent and manganese alloy in the tapping process;
2) Immediately adding a modifier after tapping of the converter, and controlling the content of total iron TFe in the steel slag;
3) Controlling RH to-station oxygen content and to-station temperature;
4) After RH vacuum is finished, standing for not less than 10min after molten steel treatment is finished;
5) The whole-course protection casting is adopted in the continuous casting process, and the casting residue of a continuous casting machine is controlled;
6) The ladle must be specially used, and the ladle for producing plain carbon steel or low alloy steel by using the previous furnace cannot be used.
Specifically, the tapping temperature T=1690-1710 ℃ of the converter in the step 1) and the endpoint oxygen [ O ] =900-1100 ppm, 600 kg/furnace of lime is added in the tapping process, 200 kg/furnace of fluxing agent is added, and the manganese alloy is added to the lower limit of the manganese content requirement.
Specifically, the fluxing agent is a material formed by mixing and pressing more than or equal to 60% of aluminum oxide and more than or equal to 5% of calcium oxide, and the granularity is 5-60mm.
Specifically, the addition amount of the modifier in the step 2) is controlled to be 400-500 kg/furnace, and if the slag melting is good, bottom blowing is not started; if the melting effect of the modifier is poor, the open bottom blowing is less than or equal to 1 minute, the modifier is uniformly spread, and the ladle bottom blowing flow with normal air permeability is controlled to be 10m 3 /h; after RH arrives at the station, the content of the total iron TFe in the steel slag is controlled to be less than or equal to 5 percent.
Specifically, the modifier is a material prepared by mixing and pressing single-value aluminum with the content of more than or equal to 48%, aluminum oxide with the content of more than or equal to 15% and calcium oxide with the content of more than or equal to 15%, the granularity is 10-30mm, the terminal oxygen content is more than or equal to 1000ppm, and 450-500kg of modifier is added; the end point oxygen is less than or equal to 900ppm and less than 1000ppm, and the modifier is added into 400-450kg.
Specifically, the RH to station oxygen content in the step 3) is controlled according to 400-500ppm, the station temperature is controlled according to 1620-1630 ℃, when the station oxygen content is more than or equal to 600ppm, on the premise of ensuring the temperature, carbon powder is added for deoxidizing in small batches and multiple batches according to 10 Kg/time and less than or equal to 2 times, oxygen blowing is needed to carry out forced decarburization, when the vacuum degree is 3000pa, oxygen blowing is started to carry out forced decarburization, the gun position is 5.5m, and the oxygen supply strength is 2200m 3 Per hour, the oxygen blowing amount is 50-100m 3 Control to ensure that the decarburization time is controlled within 12min, [ C ]]Less than or equal to 0.0010 percent, when the CO concentration of the waste gas is 0.12 percent, aluminum can be added for deoxidization, and then component alloy adjustment is carried out.
Specifically, the whole-process protection pouring in the step 5) monitors abnormal conditions of converter point blowing, terminal peroxidation, poor pre-deoxidation of tapping, poor top slag modification, RH oxygen blowing, insufficient pure degassing time and insufficient sedation time.
Specifically, the casting residue of the continuous casting machine in the step 5) is more than or equal to 4t, so that the ladle is ensured not to be slagged.
The invention has the following beneficial effects:
the invention relates to a method for making ultra-low carbon high alloy steel
1. The continuous casting furnace number of the ultra-low carbon high alloy steel is improved, the furnace number is increased to 10 from the previously controlled furnace number 3, the use amount of a tundish is reduced, the consumption of steel materials in whole casting times is reduced, and the production cost is comprehensively reduced.
2. The stable control of the RH treatment period of the ultra-low carbon high alloy is realized, the time is shortened to 35 minutes from 45 minutes before, mainly the alloy manganese is moved to a converter, the difficulty of RH alloy adding is reduced, and the time for adjusting components is prevented from being longer due to the RH alloy adding;
3. the alloy is added in the converter, so that the end temperature and the end oxygen of the converter are improved, the low oxygen and the low oxygen of the RH to the end temperature are avoided, and the oxygen blowing amount of RH is reduced to be more than 100m 3 The inclusion content in the steel is reduced, the problems of stroke expansion and nozzle nodulation and nozzle replacement in the continuous casting process are effectively reduced or avoided, and the improvement rate of the inclusion defect of the steel plate is also reduced;
4. the stable control of the molten steel component C, mn is realized, the Mn is matched with the converter to the lower limit, the RH is slightly adjusted, and the component fluctuation caused by adding a large amount of Mn-iron alloy into the RH is reduced; the converter increases the end point oxygen to 900-1100ppm, the C content is about 0.02-0.03%, and the forced decarburization is carried out by blowing oxygen under RH high vacuum degree, 2200m is utilized 3 And/h, the high-speed oxygen flow directly reacts on carbon in the molten steel, so that the carbon in the molten steel can be rapidly removed to be within 0.0010 percent, and the carbon of a finished product is stably controlled to be within 0.0015 percent.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described in further detail below. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The process route is still the traditional KR-BOF-RH-CC, and the specific process is realized as follows:
1. the tapping temperature T=1690-1710 deg.c, the end oxygen O=900-1100 ppm, lime 600 kg/furnace, flux 200 kg/furnace, mixed and pressed aluminum oxide not less than 60% and calcium oxide not less than 5%, granularity 5-60mm, mn alloy and Mn alloy to the required lower limit.
2. After tapping of the converter is finished, 400-500kg of modifier is added immediately, wherein the modifier is a material formed by mixing and pressing of more than or equal to 48% of single-value aluminum, more than or equal to 15% of aluminum oxide and more than or equal to 15% of calcium oxide, the granularity is 10-30mm, the terminal oxygen is more than or equal to 1000ppm, and 450-500kg of modifier is added; the end point oxygen is less than or equal to 900ppm and less than 1000ppm, the modifier is added into 400-450kg, and if the slag melting is good, bottom blowing is not started; if the modifier has poor melting effect, open bottom blowing is less than or equal to 1 minute (the modifier is uniformly spread), and the ladle bottom blowing flow with normal air permeability is controlled to be 10m 3 /h; after RH arrives at the station, the content of the total iron TFe in the steel slag is controlled to be less than or equal to 5 percent.
RH to station oxygen is controlled at 400-500ppm and to station temperature is controlled at 1620-1630 ℃. When the standing oxygen is more than or equal to 600ppm, carbon powder can be added for deoxidization in small batches (10 Kg/time, less than or equal to 2 times) under the premise of ensuring the temperature.
When the vacuum degree is 3000pa, the oxygen blowing forced decarburization is started, the gun position is 5.5m, and the oxygen supply intensity is 2200m 3 And/h, the oxygen blowing amount is 50-100m 3 Control (taking into account this oxygen blowing amount in advance) to ensure that the decarburization time is controlled within 12min, [ C ]]Less than or equal to 0.0010 percent (when the CO concentration of the waste gas reaches 0.12 percent, aluminum can be added for deoxidization), and then component alloy adjustment is carried out.
And 4, after the RH vacuum is finished, standing for not less than 10min after the molten steel is treated, and not opening soft blowing.
5. The continuous casting process adopts the abnormal conditions of whole-course protection casting, such as converter point blowing, terminal peroxidation, poor pre-deoxidation of tapping, poor top slag modification, RH oxygen blowing, insufficient pure degassing time, insufficient calming time and the like, and the casting residue of a continuous casting machine must be more than or equal to 4t so as to ensure that the ladle does not slag off.
6. The ladle is special for realizing special ladle, the ladle for producing plain carbon steel or low alloy steel by using the last furnace cannot be used, and the ladle added with rice husk cannot be used.
Example 1:
1. the tapping temperature T=1695% (casting 1 st furnace 1710 ℃), the end point oxygen [ O ] =900 ppm, adding lime 600 kg/furnace, adding fluxing agent 200 kg/furnace, adding metal manganese to alloy Mn to the required lower limit of 0.60% (Mn range of 0.60% -0.80%).
2. 450kg of modifier and 450kg of RH are added immediately after tapping of the converter, and the RH reaches the total iron TFe in the steel slag after standing: 3%.
RH to station oxygen 450ppm to station temperature 1625 ℃.
And 4, standing for 12min after the RH vacuum is finished and the molten steel is treated.
5. The whole-course protection pouring is adopted in the continuous casting pouring process, and the casting residue of the continuous casting machine is 5t, so that the ladle is ensured not to be slagged.
6. The ladle is special for realizing special ladle, the ladle for producing plain carbon steel or low alloy steel by using the last furnace cannot be used, and the ladle added with rice husk cannot be used.
7. Finally, the number of continuous casting furnaces reaches 10 furnaces, and the water gap is not replaced in the casting process.
The present invention is not limited to the above embodiments, and any person who can learn the structural changes made under the teaching of the present invention can fall within the scope of the present invention if the present invention has the same or similar technical solutions.
The technology, shape, and construction parts of the present invention, which are not described in detail, are known in the art.
Claims (8)
1. The method for steelmaking of the ultra-low carbon high alloy steel is characterized by comprising the following steps of:
1) Controlling the tapping temperature and the terminal oxygen content of the converter, and adding lime, fluxing agent and manganese alloy in the tapping process;
2) Immediately adding a modifier after tapping of the converter, and controlling the content of total iron TFe in the steel slag;
3) Controlling RH to-station oxygen content and to-station temperature;
4) After RH vacuum is finished, standing for not less than 10min after molten steel treatment is finished;
5) The whole-course protection casting is adopted in the continuous casting process, and the casting residue of a continuous casting machine is controlled;
6) The ladle must be specially used, and the ladle for producing plain carbon steel or low alloy steel by using the previous furnace cannot be used.
2. The method for producing ultra-low carbon high alloy steel according to claim 1, wherein the tapping temperature t=1690-1710 ℃ of the converter in the step 1) is set to be in the range of from 900 to 1100ppm, the terminal oxygen [ O ] =900-1100 ppm, 600 kg/furnace of lime is added during tapping, 200 kg/furnace of flux is added, and the manganese alloy is added to the lower limit of the manganese content requirement.
3. The method for producing ultra-low carbon high alloy steel according to claim 2, wherein the fluxing agent is a material obtained by mixing and pressing more than or equal to 60% of aluminum oxide and more than or equal to 5% of calcium oxide, and has a granularity of 5-60mm.
4. The method for producing ultra-low carbon high alloy steel according to claim 1, wherein the modifier in step 2) is added in an amount of 400-500 kg/furnace, and if the slag formation is good, bottom blowing is not performed; if the melting effect of the modifier is poor, the open bottom blowing is less than or equal to 1 minute, the modifier is uniformly spread, and the ladle bottom blowing flow with normal air permeability is controlled to be 10m 3 /h; after RH arrives at the station, the content of the total iron TFe in the steel slag is controlled to be less than or equal to 5 percent.
5. The method for producing ultra-low carbon high alloy steel according to claim 4, wherein the modifier is a material prepared by mixing and pressing single-value aluminum more than or equal to 48%, aluminum oxide more than or equal to 15% and calcium oxide more than or equal to 15%, the granularity is 10-30mm, the terminal oxygen more than or equal to 1000ppm, and the modifier is added into 450-500kg; the end point oxygen is less than or equal to 900ppm and less than 1000ppm, and the modifier is added into 400-450kg.
6. The method for producing ultra-low carbon high alloy steel according to claim 1, wherein the RH to station oxygen content in the step 3) is controlled to be 400-500ppm, the station temperature is controlled to be 1620-1630 ℃, when the station oxygen content is more than or equal to 600ppm, the oxygen is deoxidized by adding carbon powder for 10 Kg/time and less than or equal to 2 times in small batches and multiple batches under the premise of ensuring the temperature, oxygen blowing is required to be carried out for forced decarburization, and when the vacuum degree is 3000pa, oxygen blowing is started for forced decarburization, the gun position is 5.5m, and the oxygen supply strength is 2200m 3 And/h, the oxygen blowing amount is 50-100m 3 Control to ensure that the decarburization time is controlled within 12min, [ C ]]Less than or equal to 0.0010 percent, when the CO concentration of the waste gas is 0.12 percent, aluminum can be added for deoxidization, and then component alloy adjustment is carried out.
7. The method for producing ultra-low carbon high alloy steel according to claim 1, wherein the whole-process protection casting in step 5) monitors abnormal conditions of converter point blowing, terminal peroxidation, poor pre-deoxidation of tapping, poor top slag modification, oxygen blowing in RH, insufficient pure degassing time and insufficient sedation time.
8. The method for producing ultra-low carbon high alloy steel according to claim 1, wherein the casting residue of the continuous casting machine in the step 5) is not less than 4t, and the ladle is ensured not to be slagged.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310857683.1A CN116855816A (en) | 2023-07-13 | 2023-07-13 | Steelmaking method of ultralow-carbon high-alloy steel |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310857683.1A CN116855816A (en) | 2023-07-13 | 2023-07-13 | Steelmaking method of ultralow-carbon high-alloy steel |
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