CN116479210A - Composite carbureting method for smelting medium-high carbon steel in converter - Google Patents
Composite carbureting method for smelting medium-high carbon steel in converter Download PDFInfo
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- CN116479210A CN116479210A CN202310264333.4A CN202310264333A CN116479210A CN 116479210 A CN116479210 A CN 116479210A CN 202310264333 A CN202310264333 A CN 202310264333A CN 116479210 A CN116479210 A CN 116479210A
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000003723 Smelting Methods 0.000 title claims abstract description 19
- 229910000677 High-carbon steel Inorganic materials 0.000 title claims abstract description 11
- 239000002131 composite material Substances 0.000 title claims abstract description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 42
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 30
- 239000010959 steel Substances 0.000 claims abstract description 30
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 29
- 238000010079 rubber tapping Methods 0.000 claims abstract description 25
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 20
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 14
- QFGIVKNKFPCKAW-UHFFFAOYSA-N [Mn].[C] Chemical compound [Mn].[C] QFGIVKNKFPCKAW-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910052786 argon Inorganic materials 0.000 claims abstract description 10
- 238000007664 blowing Methods 0.000 claims abstract description 9
- 238000003756 stirring Methods 0.000 claims abstract description 9
- 238000007670 refining Methods 0.000 claims abstract description 8
- 229910052742 iron Inorganic materials 0.000 claims abstract description 7
- 238000005275 alloying Methods 0.000 claims abstract description 4
- 238000005266 casting Methods 0.000 claims abstract description 4
- 238000009749 continuous casting Methods 0.000 claims abstract description 4
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 4
- 230000023556 desulfurization Effects 0.000 claims abstract description 4
- 239000011261 inert gas Substances 0.000 claims abstract description 4
- 238000005096 rolling process Methods 0.000 claims abstract description 4
- 238000010583 slow cooling Methods 0.000 claims abstract description 4
- 238000011282 treatment Methods 0.000 claims abstract description 4
- 239000012535 impurity Substances 0.000 claims description 6
- 238000005070 sampling Methods 0.000 claims description 3
- 230000001502 supplementing effect Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000011084 recovery Methods 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 229910000639 Spring steel Inorganic materials 0.000 description 1
- 241001062472 Stokellia anisodon Species 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0025—Adding carbon 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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0075—Treating in a ladle furnace, e.g. up-/reheating of molten steel within the ladle
-
- 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
- C22C33/06—Making ferrous alloys by melting using master alloys
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses a composite carburetion method for medium-high carbon steel in converter smelting, which comprises the steps of molten iron desulfurization pretreatment, converter smelting, tapping deoxidization alloying, carburetion and inclusion removal, ladle inert gas bottom blowing stirring, LF refining treatment, continuous casting, casting blank slow cooling and rolling; and (3) component design: c:0.80 to 0.83 percent; si:0.18-0.28%; mn:0.80 to 0.90 percent; v:0.025 to 0.032; p: less than or equal to 0.020%; s is less than or equal to 0.015 percent; cr:0.19 to 0.24 percent; cu is less than or equal to 0.10 percent; ni is less than or equal to 0.10%; the converter end point control adopts a high-pulling and repair-blowing process, the carbon of the molten steel end point is controlled to be between 0.3 and 0.5 percent, 200 to 300kg of carbon powder is manually thrown into a steel ladle after steel flow is seen in the tapping process, and carbon-manganese balls are added into the steel ladle when tapping is finished; refining control of an LF furnace: and (5) stirring argon after entering a station, and manually adding carbon powder to accurately control carbon components.
Description
Technical Field
The invention relates to a composite carburetion method for smelting medium-high carbon steel in a converter.
Background
The production process of 82B in the medium-high carbon steel grade is most representative, the traditional carburetion process in the 82B production process is that the carbon content of the smelting end point of a converter is about 0.10%, carbon-manganese balls (the carbon content is about 65% and the manganese content is about 12%) are added into a steel ladle for carburetion after tapping is finished, and the traditional carburetion process has the following problems: 1. the carbon pulling at the smelting end point is lower, the oxygen content of molten steel is high, and the later deoxidation pressure and the control difficulty of inclusions are increased; 2. the tapping carbon is low, and the carbon manganese balls are added in a large amount to carry out carburetion, so that the smelting cost is increased; 3. the carbon-manganese ball melts slowly, molten steel carbon is low in the tapping process, the liquidus temperature of the molten steel is high, the molten steel is easy to condense at the bottom of a ladle to block a permeable core in the tapping process, argon is not introduced, and the situation that an LF furnace cannot smelt is avoided. The calculation formula of the liquidus of molten steel: liquid t=1536- [78 (%c) +7.6 (%si) +4.9 (%mn) +34 (%p) +30 (%s) +5.0 (%cu) +3.1 (%ni) +1.3 (%cr) +3.6 (%al) +2.0 (%mo) +2.0 (%v) +18 (%ti) ], and the liquidus temperature of the molten steel is about 1522 ℃ when tapping is calculated according to the above formula, and it is necessary to ensure that the solidification tapping temperature of the molten steel at the ladle bottom does not reach more than 1550 ℃; 4. the carbon-manganese balls float on the slag surface, and in the LF power transmission process, a large amount of carbon-manganese balls are burnt, the carbon recovery rate is unstable, so that LF initial carbon fluctuation is large, the carbon distribution difficulty of the LF furnace is increased, the smelting period of the LF furnace is prolonged, the soft blowing time is shortened, and the floating of inclusions is promoted disadvantageously.
Disclosure of Invention
The invention aims to provide a composite carburetion method for medium-high carbon steel in converter smelting, which is used for carbureting the medium-high carbon steel, realizing quick carburetion, reducing liquidus temperature of molten steel, improving recovery rate of carbon and realizing stability of initial carbon of an LF furnace.
The technical scheme adopted by the invention is that the composite carburetion method for smelting medium-high carbon steel in a converter comprises the following process steps: molten iron desulfurization pretreatment, converter smelting, tapping deoxidization alloying, carbureting and impurity removal, ladle inert gas bottom blowing stirring, LF refining treatment, continuous casting, casting blank slow cooling and rolling; and (3) component design: c:0.80 to 0.83 percent; si:0.18-0.28%; mn:0.80 to 0.90 percent; v:0.025 to 0.032; p: less than or equal to 0.020%; s is less than or equal to 0.015 percent; cr:0.19 to 0.24 percent; cu is less than or equal to 0.10 percent; ni is less than or equal to 0.10%; the balance of iron and unavoidable impurities; the implementation method comprises the following steps: controlling the smelting end point of the converter, wherein the converter end point control adopts a high-pulling and supplementing blowing process, the carbon content of molten steel end point is controlled to be between 0.3 and 0.5 percent, argon is blown into the bottom of a ladle before tapping, 200 to 300kg of carbon powder is manually thrown into the ladle after the steel flow is seen in the tapping process, 0.1 to 0.15 percent of carbon powder is used for carbureting, carbon-manganese balls are added into the ladle after the tapping is finished, the rest carbon is supplemented, the carbon content of molten steel is controlled to be between 0.4 and 0.65 percent, and the liquidus temperature of the molten steel is reduced to be between 1479 and 1498 ℃; refining control of an LF furnace: argon stirring is carried out after entering a station, power is transmitted for 10-15min, sampling is carried out to determine the carbon content, and the final accurate control of the carbon components is carried out by manually throwing carbon powder.
After the converter end point control and the tapping carburetion mode are regulated, no steel ladle argon gas is led in the 82B production process, the hit rate of initial carbon components of the LF furnace is improved from about 35% to 80%, the adding amount of the carbon-manganese balls is reduced from 1800 kg/furnace to 1000 kg/furnace, and good benefits are obtained from the aspects of cost control, quality improvement and production stability. The method is applicable to converters for producing medium-high carbon steel, and the steel types such as spring steel, hard wire steel, 82B and the like are high in special steel at present, so that the composite carburetion method has wide application prospect.
Detailed Description
A composite carburetion method for smelting medium-high carbon steel in a converter comprises the following steps: molten iron desulfurization pretreatment, converter smelting, tapping deoxidization alloying, carbureting and impurity removal, ladle inert gas bottom blowing stirring, LF refining treatment, continuous casting, casting blank slow cooling and rolling; component design (taking 82B as an example)
C:0.80 to 0.83 percent; si:0.18-0.28%; mn:0.80 to 0.90 percent; v:0.025 to 0.032; p: less than or equal to 0.020%; s is less than or equal to 0.015 percent; cr:0.19 to 0.24 percent; cu is less than or equal to 0.10 percent; ni is less than or equal to 0.10%; the balance being iron and unavoidable impurities.
Implementation method
Converter smelting endpoint control
The converter end point control adopts a high-pulling and repair-blowing process, and the carbon of the molten steel end point is controlled between 0.3% and 0.5%, so that the dephosphorization requirement can be met, and the oxygen content of the molten steel at the end point can be greatly reduced.
Converter tapping control
Before tapping, opening the ladle to blow argon, after tapping, 200-300 kg of carbon powder is manually thrown into the ladle, 0.1-0.15% of carbon powder is carbureted, and the recovery rate of the carbon powder is relatively stable under the dual actions of argon stirring and steel flow impact. And adding carbon-manganese balls into the ladle after tapping, and supplementing the rest carbon.
The carbon content of molten steel can be controlled to be between 0.4 and 0.65 percent by tapping and carbon pulling and tapping and carbon powder carbureting, and the liquidus temperature of the molten steel can be reduced to be between 1479 and 1498 ℃. Effectively avoid the condition of the condensation at the bottom of the ladle and the blockage of the ventilation core due to the low temperature of the molten steel.
LF furnace refining control
Argon stirring is carried out after entering a station, power is transmitted for 10-15min, sampling is carried out to determine the carbon content, and the final accurate control of the carbon components is carried out by manually throwing carbon powder.
Production example
。
Claims (1)
1. A composite carburetion method for smelting medium-high carbon steel in a converter is characterized by comprising the following steps: molten iron desulfurization pretreatment, converter smelting, tapping deoxidization alloying, carbureting and impurity removal, ladle inert gas bottom blowing stirring, LF refining treatment, continuous casting, casting blank slow cooling and rolling; and (3) component design: c:0.80 to 0.83 percent; si:0.18-0.28%; mn:0.80 to 0.90 percent; v:0.025 to 0.032; p: less than or equal to 0.020%; s is less than or equal to 0.015 percent; cr:0.19 to 0.24 percent; cu is less than or equal to 0.10 percent; ni is less than or equal to 0.10%; the balance of iron and unavoidable impurities; the implementation method comprises the following steps: controlling the smelting end point of the converter, wherein the converter end point control adopts a high-pulling and supplementing blowing process, the carbon content of molten steel end point is controlled to be between 0.3 and 0.5 percent, argon is blown into the bottom of a ladle before tapping, 200 to 300kg of carbon powder is manually thrown into the ladle after the steel flow is seen in the tapping process, 0.1 to 0.15 percent of carbon powder is used for carbureting, carbon-manganese balls are added into the ladle after the tapping is finished, the rest carbon is supplemented, the carbon content of molten steel is controlled to be between 0.4 and 0.65 percent, and the liquidus temperature of the molten steel is reduced to be between 1479 and 1498 ℃; refining control of an LF furnace: argon stirring is carried out after entering a station, power is transmitted for 10-15min, sampling is carried out to determine the carbon content, and the final accurate control of the carbon components is carried out by manually throwing carbon powder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310264333.4A CN116479210A (en) | 2023-03-19 | 2023-03-19 | Composite carbureting method for smelting medium-high carbon steel in converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310264333.4A CN116479210A (en) | 2023-03-19 | 2023-03-19 | Composite carbureting method for smelting medium-high carbon steel in converter |
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| Publication Number | Publication Date |
|---|---|
| CN116479210A true CN116479210A (en) | 2023-07-25 |
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|---|---|---|---|
| CN202310264333.4A Pending CN116479210A (en) | 2023-03-19 | 2023-03-19 | Composite carbureting method for smelting medium-high carbon steel in converter |
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| CN (1) | CN116479210A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1752546A1 (en) * | 2005-07-26 | 2007-02-14 | Trinecke Zelezarny, A.S. | The method of making high-purity steels |
| AU2009279383A1 (en) * | 2008-08-07 | 2010-02-11 | Newsouth Innovations Pty Limited | Recarburisation method |
| CN102776320A (en) * | 2011-05-13 | 2012-11-14 | 宝钢集团新疆八一钢铁有限公司 | Carbon control method for hard wire steel-wire steel smelting |
| CN106435084A (en) * | 2016-11-26 | 2017-02-22 | 湖南华菱湘潭钢铁有限公司 | Smelting method of ultralow-oxygen and medium-high-carbon steel |
| CN113969376A (en) * | 2021-11-01 | 2022-01-25 | 新疆八一钢铁股份有限公司 | Preparation method of wire rod for suspension cable steel wire |
| CN114480777A (en) * | 2022-03-05 | 2022-05-13 | 新疆八一钢铁股份有限公司 | Method for realizing 82B high-carbon tapping of converter through double-slag method |
| CN114574770A (en) * | 2022-03-05 | 2022-06-03 | 新疆八一钢铁股份有限公司 | Preparation method of high-strength fatigue-resistant 60Si2MnA spring steel |
| CN115338383A (en) * | 2022-08-19 | 2022-11-15 | 建龙北满特殊钢有限责任公司 | Method for controlling cracks at inner corner of medium-carbon MnB steel bloom |
-
2023
- 2023-03-19 CN CN202310264333.4A patent/CN116479210A/en active Pending
Patent Citations (8)
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|---|---|---|---|---|
| EP1752546A1 (en) * | 2005-07-26 | 2007-02-14 | Trinecke Zelezarny, A.S. | The method of making high-purity steels |
| AU2009279383A1 (en) * | 2008-08-07 | 2010-02-11 | Newsouth Innovations Pty Limited | Recarburisation method |
| CN102776320A (en) * | 2011-05-13 | 2012-11-14 | 宝钢集团新疆八一钢铁有限公司 | Carbon control method for hard wire steel-wire steel smelting |
| CN106435084A (en) * | 2016-11-26 | 2017-02-22 | 湖南华菱湘潭钢铁有限公司 | Smelting method of ultralow-oxygen and medium-high-carbon steel |
| CN113969376A (en) * | 2021-11-01 | 2022-01-25 | 新疆八一钢铁股份有限公司 | Preparation method of wire rod for suspension cable steel wire |
| CN114480777A (en) * | 2022-03-05 | 2022-05-13 | 新疆八一钢铁股份有限公司 | Method for realizing 82B high-carbon tapping of converter through double-slag method |
| CN114574770A (en) * | 2022-03-05 | 2022-06-03 | 新疆八一钢铁股份有限公司 | Preparation method of high-strength fatigue-resistant 60Si2MnA spring steel |
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| Title |
|---|
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