CN115011751B - Endpoint manganese alloying control method for high manganese steel converter - Google Patents

Endpoint manganese alloying control method for high manganese steel converter Download PDF

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Publication number
CN115011751B
CN115011751B CN202210715702.2A CN202210715702A CN115011751B CN 115011751 B CN115011751 B CN 115011751B CN 202210715702 A CN202210715702 A CN 202210715702A CN 115011751 B CN115011751 B CN 115011751B
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converter
alloy
controlled
temperature
end point
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CN202210715702.2A
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CN115011751A (en
Inventor
刁望才
梁志刚
麻晓光
张胤
韩春鹏
张怀军
唐建平
张昭
宋海
郝振宇
翁举
王志君
杨小龙
王爱兰
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Baotou Iron and Steel Group Co Ltd
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Baotou Iron and Steel Group Co Ltd
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    • 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
    • C21C5/30—Regulating or controlling the blowing
    • C21C5/34—Blowing through the bath
    • 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
    • C21C5/30—Regulating or controlling the blowing
    • 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
    • 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
    • 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
    • Y02P10/25—Process efficiency

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)

Abstract

The invention discloses a method for controlling manganese alloying at the end point of a high manganese steel converter, which comprises the following steps: an alloy baking device is adopted to bake the alloy, so that the alloy is preheated to about 300 ℃; the converter end point is controlled by high temperature, and the converter carbon pulling temperature is controlled to be above 1660 ℃; the converter endpoint is controlled by adopting the in-furnace pre-deoxidation operation, so that the influence of the oxygen content of the converter endpoint on the alloy yield is reduced; the bottom blowing of the converter is controlled by high bottom blowing intensity, so that the full stirring and alloy melting are ensured. The invention aims to provide a method for controlling the final manganese alloying of a high manganese steel converter, which solves the problems of large amount of alloy and large temperature drop in the refining process, realizes the partial alloying operation control in the converter process, and can effectively relieve the problems of large amount of alloy and large temperature drop in the refining process.

Description

Endpoint manganese alloying control method for high manganese steel converter
Technical Field
The invention relates to the technical field of steelmaking, in particular to a method for controlling manganese alloying at the end point of a high manganese steel converter.
Background
In recent years, high alloy steel is developed rapidly, and the alloying of the high alloy steel in the steelmaking process is always a technical problem of steelmaking control of the high alloy steel, and the alloying in the high alloy steel production process is mainly performed in a refining process, so that the adding amount of the alloy in the refining process is large, the temperature reduction is extremely large, and the control is difficult.
In order to solve the problems of large amount of alloy and large temperature drop in the refining process, the invention considers that alloying operation is carried out in other processes to replace or partially replace the alloying operation in the refining process.
Disclosure of Invention
The invention aims to provide a method for controlling the final manganese alloying of a high manganese steel converter, which solves the problems of large amount of alloy and large temperature drop in the refining process in the background technology, realizes the partial alloying operation control in the converter process, and can effectively relieve the problems of large amount of alloy and large temperature drop in the refining process.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention discloses a method for controlling manganese alloying at the end point of a high manganese steel converter, which comprises the following steps: an alloy baking device is adopted to bake the alloy, so that the alloy is preheated to about 300 ℃; the converter end point is controlled by high temperature, and the converter carbon pulling temperature is controlled to be above 1660 ℃; the converter endpoint is controlled by adopting the in-furnace pre-deoxidation operation, so that the influence of the oxygen content of the converter endpoint on the alloy yield is reduced; the bottom blowing of the converter is controlled by high bottom blowing intensity, so that the full stirring and alloy melting are ensured.
Further, the method specifically comprises the following steps:
1) Alloy baking
In the process of producing high alloy steel, an alloy baking device is adopted to bake the alloy, and the baked alloy is added into a converter through a charging chute after the converter is subjected to carbon drawing; the production time sequence of the converter is fully controlled, the alloy baking and heating are carried out for enough time, the alloy baking time is ensured to be longer than 60 minutes, the alloy is preheated to 300 ℃, the temperature drop of molten steel of the converter is reduced, the lump rate of the alloy is reduced, the alloy melting speed is accelerated, and a good temperature condition is created for the steel tapping operation control after the alloying of the converter;
2) Converter end temperature control
The end point of the converter is controlled at a high temperature, the carbon pulling temperature of the converter is controlled above 1660 ℃ as much as possible, the molten steel temperature is high, the alloy melting speed can be improved, the steel tapping requirement can be met due to the temperature reduction, and the steel tapping temperature is more than 1580 ℃; and (3) preparing a 150 converter molten steel amount ferromanganese alloy addition control scheme: the end temperature of the converter is 1700 ℃, the alloy amount is 12 tons, the molten steel amount is 138 tons, the pressure of refining alloy can be effectively relieved, and favorable conditions are created for the smooth production of high alloy steel;
3) Deoxidizing operation in converter
The carbon content of the end point of the converter is controlled to be more than 0.05%, so that the influence on the alloy yield caused by the excessively high control oxidability of the ultra-low carbon is prevented; the pre-deoxidation operation control in the furnace is adopted, and an aluminum iron deoxidizer is added before the ferromanganese is added into the converter, so that the influence of the oxygen content of the end point of the converter on the alloy yield is reduced; adding 300kg of aluminum iron when the carbon content of the converter end point is above 0.05%, and adding 400-500kg of aluminum iron when the carbon content of the converter end point is below 0.05%;
4) High-strength converter bottom blowing control
The bottom blowing of the converter is controlled by high bottom blowing intensity, and the bottom blowing intensity is controlled to be 0.15Nm 3 And/t.min and above, ensures the full stirring of molten steel in a converter molten pool and promotes the melting of alloy.
Further, the bottom blowing strength was controlled to 0.60Nm 3/t.min or more.
Compared with the prior art, the invention has the beneficial technical effects that:
the invention = formulated high manganese steel converter endpoint manganese alloying control scheme is applied to high manganese steel converter process alloying steelmaking production, creates conditions for alleviating the problems of large alloy adding amount and large temperature drop in the refining process, and realizes smooth high manganese steel steelmaking production.
Drawings
The invention is further described with reference to the following description of the drawings.
Fig. 1: alloy baking bin device;
fig. 2: alloy baking bin device and blanking system;
reference numerals illustrate: 1. a gas pipeline; 2. a gas nozzle; 3. alloy baking bin; 4. a blanking valve; 5. discharging pipes; 6. vaporization flue; 7. a movable smoke cover; 8. a converter; 9. molten steel; 10. and (5) a bottom blowing pipeline.
Detailed Description
In order that the above aspects, features and advantages of the invention will be more readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof.
A method for controlling the end point manganese alloying of a high manganese steel converter comprises the following steps:
1. alloy baking
In the process of producing high alloy steel, an alloy baking device is adopted to bake the alloy, as shown in fig. 1, and the baked alloy is added into a converter through a charging chute after the converter is subjected to carbon drawing, as shown in fig. 2. The production time sequence of the converter is fully controlled, the alloy baking and heating are carried out for enough time, the alloy baking time is ensured to be longer than 60 minutes, the alloy is preheated to about 300 ℃, the temperature drop of the molten steel of the converter is reduced, the lump rate of the alloy is reduced, the alloy melting speed is accelerated, and a good temperature condition is created for the operation control of tapping after alloying of the converter.
2. Converter end temperature control
The end point of the converter is controlled at high temperature, the carbon pulling temperature of the converter is controlled above 1660 ℃ as much as possible, the melting speed of the alloy can be improved due to high temperature of molten steel, the tapping requirement can be met due to temperature reduction, the tapping temperature is higher than 1580 ℃, and a scheme for controlling the adding amount of ferromanganese alloy in molten steel of the converter is formulated to be shown in table 1.
Table 1 table of ferromanganese addition schedule
Carbon drawing temperature/°c Alloy amount/t Molten steel volume/t Final temperature/. Degree.C
Scheme 1 1640 6 144 1581
Scheme 2 1660 8 142 1581.4
Scheme 3 1680 10 140 1579.7
Scheme 4 1700 12 138 1578.1
As shown in table 1, under the conditions that the steel tapping water amount of the converter is 150t and the final temperature is controlled to 1580 ℃, the higher the end point temperature of the converter is, the more alloy can be added; as shown in scheme 4, when the end temperature of the converter is 1700 ℃, the alloy amount can reach 12 tons, the pressure of refined alloy can be effectively relieved, and favorable conditions are created for the smooth production of high alloy steel.
3. Deoxidizing operation in converter
The carbon content of the end point of the converter is controlled to be more than 0.05%, so that the influence on the alloy yield caused by the excessively high control oxidizing property of the ultra-low carbon is prevented. The pre-deoxidation operation control in the furnace is adopted, and an aluminum iron deoxidizer is added before the ferromanganese is added into the converter, so that the influence of the oxygen content of the end point of the converter on the alloy yield is reduced; adding 300kg of aluminum iron when the carbon content of the converter end point is above 0.05%, adding 400-500kg of aluminum iron when the carbon content of the converter end point is below 0.05%,
4. high strength converter bottom blowing control
The bottom blowing of the converter is controlled by high bottom blowing intensity, and the bottom blowing intensity can be controlled to be 0.15Nm 3 And (3) ensuring the molten steel in a converter molten pool to be fully stirred and promoting the alloy to be melted. If the converter bottom blowing equipment is provided with a larger strength control condition, a larger bottom blowing strength control can be performed if 0.60Nm can be reached 3 And/t.min and above, can realize more sufficient stirring of molten steel in a converter molten pool, has very good dynamic stirring conditions of the converter molten pool, and is very beneficial to promoting alloy melting.
The above embodiments are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solution of the present invention should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the design of the present invention.

Claims (2)

1. The method for controlling the end point manganese alloying of the high manganese steel converter is characterized by comprising the following steps of: an alloy baking device is adopted to bake the alloy, so that the alloy is preheated to about 300 ℃; the converter end point is controlled by high temperature, and the converter carbon pulling temperature is controlled to be above 1660 ℃; the converter endpoint is controlled by adopting the in-furnace pre-deoxidation operation, so that the influence of the oxygen content of the converter endpoint on the alloy yield is reduced; the bottom blowing of the converter is controlled by adopting high bottom blowing intensity, so that the full stirring and alloy melting are ensured;
the method specifically comprises the following steps:
1) Alloy baking
In the process of producing high alloy steel, an alloy baking device is adopted to bake the alloy, and the baked alloy is added into a converter through a charging chute after the converter is subjected to carbon drawing; the production time sequence of the converter is fully controlled, the alloy baking and heating are carried out for enough time, the alloy baking time is ensured to be longer than 60 minutes, the alloy is preheated to 300 ℃, the temperature drop of molten steel of the converter is reduced, the lump rate of the alloy is reduced, the alloy melting speed is accelerated, and a good temperature condition is created for the steel tapping operation control after the alloying of the converter;
2) Converter end temperature control
The end point of the converter is controlled at a high temperature, the carbon pulling temperature of the converter is controlled above 1660 ℃ as much as possible, the molten steel temperature is high, the alloy melting speed can be improved, the steel tapping requirement can be met due to the temperature reduction, and the steel tapping temperature is more than 1580 ℃; and (3) preparing a 150 converter molten steel amount ferromanganese alloy addition control scheme: the end temperature of the converter is 1700 ℃, the alloy amount is 12 tons, the molten steel amount is 138 tons, the pressure of refining alloy can be effectively relieved, and favorable conditions are created for the smooth production of high alloy steel;
3) Deoxidizing operation in converter
The carbon content of the end point of the converter is controlled to be more than 0.05%, so that the influence on the alloy yield caused by the excessively high control oxidability of the ultra-low carbon is prevented; the pre-deoxidation operation control in the furnace is adopted, and an aluminum iron deoxidizer is added before the ferromanganese is added into the converter, so that the influence of the oxygen content of the end point of the converter on the alloy yield is reduced; adding 300kg of aluminum iron when the carbon content of the converter end point is above 0.05%, and adding 400-500kg of aluminum iron when the carbon content of the converter end point is below 0.05%;
4) High-strength converter bottom blowing control
The bottom blowing of the converter is controlled by high bottom blowing intensity, and the bottom blowing intensity is controlled to be 0.15Nm 3 /t.min and above, ensureThe molten steel in the converter molten pool is fully stirred to promote the melting of alloy.
2. The method for controlling manganese alloying at the end point of a high manganese steel converter according to claim 1, wherein the bottom blowing strength is controlled to be 0.60Nm 3 And/t.min and above.
CN202210715702.2A 2022-06-22 2022-06-22 Endpoint manganese alloying control method for high manganese steel converter Active CN115011751B (en)

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* Cited by examiner, † Cited by third party
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CN115584374A (en) * 2022-10-11 2023-01-10 山东钢铁股份有限公司 Method for improving alloy utilization rate in converter process

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5690920A (en) * 1979-12-25 1981-07-23 Sumitomo Metal Ind Ltd Steel making method
JP2007146218A (en) * 2005-11-25 2007-06-14 Nippon Steel Corp Steel manufacturing process, computer program, computer-readable storage medium and apparatus
CN102220448A (en) * 2011-06-02 2011-10-19 首钢总公司 Method for smelting uniform end-point molten steel composition with converter
JP2018076209A (en) * 2016-11-11 2018-05-17 Jnc株式会社 Spinning source member, web-shaped structure member, process for manufacturing spinning source member, and process for manufacturing web-shaped structure member
CN111074037A (en) * 2019-12-27 2020-04-28 宁夏晟晏实业集团能源循环经济有限公司 Novel process for upgrading manganese-rich slag smelting product structure

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5690920A (en) * 1979-12-25 1981-07-23 Sumitomo Metal Ind Ltd Steel making method
JP2007146218A (en) * 2005-11-25 2007-06-14 Nippon Steel Corp Steel manufacturing process, computer program, computer-readable storage medium and apparatus
CN102220448A (en) * 2011-06-02 2011-10-19 首钢总公司 Method for smelting uniform end-point molten steel composition with converter
JP2018076209A (en) * 2016-11-11 2018-05-17 Jnc株式会社 Spinning source member, web-shaped structure member, process for manufacturing spinning source member, and process for manufacturing web-shaped structure member
CN111074037A (en) * 2019-12-27 2020-04-28 宁夏晟晏实业集团能源循环经济有限公司 Novel process for upgrading manganese-rich slag smelting product structure

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