CN113832285B - Ultralow-carbon manganese-containing steel and low-cost production method thereof - Google Patents
Ultralow-carbon manganese-containing steel and low-cost production method thereof Download PDFInfo
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- CN113832285B CN113832285B CN202111077933.7A CN202111077933A CN113832285B CN 113832285 B CN113832285 B CN 113832285B CN 202111077933 A CN202111077933 A CN 202111077933A CN 113832285 B CN113832285 B CN 113832285B
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- 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
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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
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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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
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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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0037—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 by injecting powdered material
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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
- 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
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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
- 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
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Abstract
The invention particularly relates to an ultra-low carbon manganese-containing steel and a low-cost production method thereof, belonging to the technical field of steel preparation, and the method comprises the following steps: smelting molten iron in a converter to obtain molten steel; refining the molten steel to obtain refined molten steel; continuously casting the refined molten steel to obtain ultra-low carbon manganese-containing steel; adding a second high-carbon ferromanganese alloy according to the oxygen activity of the molten steel arriving at the station before refining; the low-cost production of the ultra-low carbon manganese-containing steel is realized by controlling the converter end point, alloying in the tapping process, refining operation and the like.
Description
Technical Field
The invention belongs to the technical field of steel preparation, and particularly relates to ultra-low carbon manganese-containing steel and a low-cost production method thereof.
Background
The pursuit of low cost production while improving quality in steel production is one of the goals of numerous enterprises. When smelting a certain type of ultra-low carbon manganese-containing steel, a converter is generally used for tapping oxygen, and after decarburization in a vacuum refining furnace is completed and deoxidation is completed, micro-carbon ferromanganese/low-carbon manganese metal and the like are added for manganese alloying.
Disclosure of Invention
The application aims to provide the ultra-low-carbon manganese-containing steel and the low-cost production method thereof so as to realize low-cost production of the ultra-low-carbon manganese-containing steel.
The embodiment of the invention provides a low-cost production method of ultra-low carbon manganese-containing steel, which comprises the following steps:
smelting molten iron in a converter to obtain molten steel;
refining the molten steel to obtain refined molten steel;
continuously casting the refined molten steel to obtain ultra-low carbon manganese-containing steel;
wherein small-particle lime and a first high-carbon ferromanganese alloy are added when the converter smelts tapping; the addition amount of the small-particle lime is 1.5Kg/t steel to 3Kg/t steel; and when the adding time of the first high-carbon ferromanganese alloy is 1/5 of the tapping amount, the adding amount of the first high-carbon ferromanganese alloy is determined according to the oxygen activity of the smelting endpoint of the converter.
Optionally, the adding amount of the first high-carbon ferromanganese alloy is determined according to the oxygen activity of the smelting endpoint of the converter, and the method specifically includes:
when the oxygen activity is more than 900ppm, the adding amount of the first high-carbon ferromanganese alloy is 2Kg/t-2.5Kg/t;
when the oxygen activity is more than 800ppm and less than or equal to 900ppm, the adding amount of the first high-carbon ferromanganese alloy is 1.5Kg/t-2Kg/t;
when the oxygen activity is more than 700ppm and less than or equal to 800ppm, the adding amount of the first high-carbon ferromanganese alloy is 1Kg/t to 1.5Kg/t;
when the oxygen activity is more than 600ppm and less than or equal to 700ppm, the adding amount of the first high-carbon ferromanganese alloy is 0.5Kg/t-1Kg/t;
when the oxygen activity is more than 500ppm and less than or equal to 600ppm, the adding amount of the first high-carbon ferromanganese alloy is 0Kg/t-0.5Kg/t.
Optionally, a second high carbon ferromanganese alloy is added before refining according to the oxygen activity of the arriving molten steel.
Optionally, before refining, adding a second high-carbon ferromanganese alloy according to the oxygen activity of the molten steel arriving at the station, specifically comprising:
when the oxygen activity is more than 650ppm, the adding amount of the second high-carbon ferromanganese alloy is 1Kg/t steel-2 Kg/t steel;
when the oxygen activity is more than 550ppm and less than or equal to 650ppm, the adding amount of the second high-carbon ferromanganese alloy is 0.5Kg/t steel-1 Kg/t steel;
when the oxygen activity is more than 450ppm and less than or equal to 550ppm, the adding amount of the second high-carbon ferromanganese alloy is 0.2Kg/t steel-0.5 Kg/t steel;
when the oxygen activity is less than 450ppm, the addition amount of the second high-carbon ferromanganese alloy is 0Kg/t steel.
Optionally, the total adding amount of the first high-carbon ferromanganese alloy and the second high-carbon ferromanganese alloy is controlled to be less than or equal to 4.5Kg/t of steel.
Optionally, the end-point temperature of the converter smelting is controlled to be 1665-1685 ℃, the end-point oxygen activity of the converter smelting is controlled to be more than or equal to 450ppm, and the end-point carbon content of the converter smelting is controlled to be less than 0.06%.
Optionally, when the end-point oxygen activity of the converter smelting is less than 450ppm, the converter smelting adopts a post-blowing operation.
Optionally, when the steel is smelted and tapped by the converter, single-path bottom blowing stirring with the flow rate of more than 150L/min is adopted.
Optionally, the vacuum degree of the refining decarburization period is controlled to be less than 67Pa, and the circulating gas flow of the refining decarburization period is 2000L/min-3200L/min.
Based on the same invention concept, the embodiment of the invention also provides the ultra-low carbon manganese-containing steel which is prepared by adopting the low-cost production method of the ultra-low carbon manganese-containing steel.
One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:
the embodiment of the invention provides a low-cost production method of ultra-low carbon manganese-containing steel, which comprises the following steps: smelting molten iron in a converter to obtain molten steel; refining the molten steel to obtain refined molten steel; continuously casting the refined molten steel to obtain ultra-low carbon manganese-containing steel; wherein small-particle lime and a first high-carbon ferromanganese alloy are added during smelting and tapping of the converter; the addition amount of the small-particle lime is 1.5Kg/t steel-3 Kg/t steel; when the adding time of the first high-carbon ferromanganese is 1/5 of the tapping amount, the adding amount of the first high-carbon ferromanganese is determined according to the oxygen activity of the smelting end point of the converter, the carbon of the high-carbon ferromanganese is used for removing the residual oxygen of the molten steel, the molten steel is purified, the carbon is deoxidized to generate CO, and the pollution to the molten steel is avoided; and meanwhile, the addition is carried out in different grades, so that excessive addition is avoided and the addition amount is proper.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a flow chart of a method provided by an embodiment of the invention.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments and examples, and the advantages and various effects of the present invention will be more clearly apparent therefrom. It will be understood by those skilled in the art that these specific embodiments and examples are for the purpose of illustrating the invention and are not to be construed as limiting the invention.
Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. If there is a conflict, the present specification will control.
Unless otherwise specifically indicated, various raw materials, reagents, instruments, equipment and the like used in the present invention may be commercially available or may be prepared by existing methods.
In order to solve the technical problems, the general idea of the embodiment of the application is as follows:
according to an exemplary embodiment of the present invention, there is provided a low-cost method for producing an ultra-low carbon manganese-containing steel, the method including:
s1, smelting molten iron in a converter to obtain molten steel;
specifically, the end point temperature of the converter is controlled to be 1665-1685 ℃, the end point oxygen activity is controlled to be more than or equal to 450ppm, the end point carbon of the converter is controlled to be less than 0.06 percent, and if the end point oxygen activity is less than 450ppm, the converter performs post-blowing operation;
the reason for controlling the end point temperature of the converter to be 1665-1685 ℃ is to ensure proper subsequent treatment temperature, if the end point temperature is too low, the station temperature is low, and molten steel is blown with oxygen at RH to heat up, so that high-carbon ferromanganese added behind the converter is oxidized into slag, and the yield of alloy is reduced; if the arrival temperature is too high, the temperature-adjusting scrap steel added in refining has large quantity and is easy to pollute molten steel.
The reason for controlling the final oxygen activity to be more than or equal to 450ppm is to ensure the oxygen decarburization amount in RH, and the adverse effect of too small oxygen activity is that the steel grade needs to use molten steel free oxygen to remove carbon in molten steel in RH so as to complete the smelting of ultra-low carbon steel, and if the oxygen activity is too low, the refining needs to be forced to blow oxygen for decarburization.
The reason for controlling the end point carbon of the converter to be 0.03-0.06 percent is to ensure that the end point oxygen activity of the converter is more than 450ppm but not too high, and the adverse effect of excessively small content is that if the end point carbon of the converter is too low, molten steel can be over-oxidized, and the quality of the molten steel is easily deteriorated due to over-oxidation of the converter.
In the tapping process, 1.5-3Kg/t of small-sized white ash is added into the tapped steel, 0-0.5Kg/t, 0.5-1Kg/t, 1-1.5Kg/t, 1.5-2Kg/t and 2-2.5Kg/t of high-carbon ferromanganese alloy are added in a grading manner according to the oxygen activity at the end point of the converter when the tapping amount is 1/5, the absorption rate of manganese is considered according to 80%, the carbon content of the molten steel is increased to a certain extent (carbon deoxidation is realized to a certain extent) while the oxidability of the molten steel is reduced, simultaneously, bottom blowing stirring with single-path flow rate being more than 150L/min is used, a sliding plate of the converter is used for blocking the tapped steel to reduce the slag discharge amount, and the tapped steel is sampled and sent to a laboratory after tapping to be used as a reference component for refining to a station.
As an optional implementation manner, the adding amount of the first high-carbon ferromanganese alloy is determined according to the oxygen activity of the converter endpoint, and specifically includes:
when the oxygen activity is more than 900ppm, the adding amount of the first high-carbon ferromanganese alloy is 2Kg/t-2.5Kg/t;
when the oxygen activity is more than 800ppm and less than or equal to 900ppm, the adding amount of the first high-carbon ferromanganese alloy is 1.5Kg/t-2Kg/t;
when the oxygen activity is more than 700ppm and less than or equal to 800ppm, the adding amount of the first high-carbon ferromanganese alloy is 1Kg/t-1.5Kg/t;
when the oxygen activity is more than 600ppm and less than or equal to 700ppm, the adding amount of the first high-carbon ferromanganese alloy is 0.5Kg/t-1Kg/t;
when the oxygen activity is more than 500ppm and less than or equal to 600ppm, the adding amount of the first high-carbon ferromanganese alloy is 0Kg/t-0.5Kg/t.
The addition amount is increased along with the increase of the oxygen activity; meanwhile, when high-carbon ferromanganese is added, the adding amount is adjusted according to the cleanliness condition of the steel ladle and the baking time of the steel ladle after the furnace, and because the cleanliness of the steel ladle is poor, more slag is adhered to the steel ladle, so that the oxygen is increased for molten steel, and thus, the high-carbon ferromanganese can be added; if the baking time of the ladle after the furnace is long, the oxidability of the baked sticky slag is very high, and high-carbon ferromanganese can be added.
S2, refining the molten steel to obtain refined molten steel; wherein a second high carbon ferromanganese alloy is added before refining according to the oxygen activity of the molten steel arriving at the station.
Specifically, refining to a station for measuring temperature and determining oxygen, and determining the next step operation according to the arrival condition, wherein if the oxygen activity is more than 650ppm, 1-2Kg/t of high-carbon ferromanganese is added in the early stage of decarburization, the oxygen activity is 550-650ppm, 0.5-1Kg/t of high-carbon ferromanganese is added in the early stage of decarburization in the decarburization period, the oxygen activity is 450-550ppm, 0.2-0.5Kg/t of high-carbon ferromanganese is added in the early stage of decarburization in the decarburization period, and when the oxygen activity is less than 450ppm, high-carbon ferromanganese is not added; meanwhile, oxygen blowing and temperature rising are needed when the temperature of the refining station is low, and high-carbon ferromanganese alloy is not added in the refining.
The mechanism of realizing low-cost steel production by adding the high-carbon ferromanganese alloy according to the oxygen activity of molten steel refined to a station is that carbon of the high-carbon ferromanganese is utilized to remove the residual oxygen in the molten steel, the molten steel is purified, and the carbon is deoxidized to generate CO, so that the molten steel cannot be polluted; but at the same time, the addition amount is proper, so the addition is carried out by adopting a step.
As an optional implementation mode, the vacuum degree is controlled to be less than 67Pa in the decarbonization period, the circulating gas flow is controlled to be 2000-3200L/min, and aluminum is used for final deoxidation, micro-carbon ferromanganese and the like are used for alloying after the vacuum decarbonization is finished; until the Mn element meets the requirements of the component addition target of the steel grade to be smelted.
S3, continuously casting the refined molten steel to obtain ultra-low carbon manganese-containing steel;
as an alternative embodiment, the total amount of high-carbon ferromanganese added in the converter and the refining is controlled to be less than or equal to 4.5Kg/t, and the carbon of the refining end of the ultra-low carbon steel is less than or equal to 0.0025 percent.
The ultra-low carbon manganese-containing steel and the low-cost production method thereof according to the present application will be described in detail with reference to examples, comparative examples and experimental data.
Example 1
The converter is normally controlled according to a converting model, sublance temperature measurement sampling is carried out at the converting end point, the temperature is 1677 ℃, the oxygen activity at the end point is 523ppm, the carbon at the end point is 0.045%, the requirement of steel tapping is met, steel tapping operation is carried out, the bottom of a steel ladle is blown open before steel tapping, the single-way flow is 200L/min, 1.7Kg/t of small-particle lime is added into the steel tapping (according to the calculation of the amount of molten steel), and 0.38Kg/t of high-carbon ferromanganese alloy is added when the steel tapping amount is about 1/5. RH refining is carried out, temperature measurement, sampling and oxygen determination are carried out when the station is reached. The temperature is 1625 ℃, the oxygen activity is 471ppm, the temperature of the molten steel and the oxygen are proper, 0.35Kg/t of high-carbon ferromanganese is added in the decarburization period, the vacuum decarburization time is 15min, the temperature is measured after the decarburization is finished, the oxygen is measured, the temperature is 1593 ℃, the oxygen activity is 235ppm, the subsequent deoxidation alloying is carried out, 1.35Kg/t of aluminum particles is added, and 3.2Kg/t of micro-carbon ferromanganese is added. The subsequent normal processing ends.
Example 2
The converter is normally controlled according to a converting model, sublance temperature measurement sampling is carried out at the converting end point, the temperature is 1670 ℃, the oxygen activity at the end point is 777ppm, the carbon at the end point is 0.034%, the tapping requirement is met, tapping operation is carried out, the bottom of a steel ladle is blown open before tapping, the single-path flow is 200L/min, 2.0Kg/t of small-particle lime is added into the tapping (according to the calculated molten steel amount), and 1.3Kg/t of high-carbon ferromanganese alloy is added when the tapping amount is about 1/5. RH refining is carried out, temperature measurement, sampling and oxygen determination are carried out at the station. The temperature is 1611 ℃, the oxygen activity is 565ppm, the temperature and the oxygen of the molten steel are proper, 1.1Kg/t of high-carbon ferromanganese is added in the decarburization period, the vacuum decarburization time is 15min, the temperature is measured after the decarburization is finished, the oxygen is measured at the temperature of 1587 ℃, the oxygen activity is 330ppm, the subsequent deoxidation alloying is carried out, 1.45Kg/t of aluminum particles and 2.7Kg/t of micro-carbon ferromanganese are added. The subsequent normal processing ends.
Example 3
The converter is normally controlled according to a blowing model, sublance temperature measurement sampling is carried out at the blowing end point, the temperature is 1683 ℃, the oxygen activity at the end point is 937ppm, the carbon at the end point is 0.030 percent, the tapping requirement is met, tapping operation is carried out, the bottom of a steel ladle is blown open before tapping, the single-way flow is 300L/min, 2.3Kg/t (according to the calculated molten steel amount) of small-sized lime is added into the tapping, and 2.2Kg/t of high-carbon ferromanganese alloy is added when the tapping amount is about 1/5. RH refining is carried out, temperature measurement, sampling and oxygen determination are carried out at the station. The temperature is 1621 ℃, the oxygen activity is 675ppm, the temperature and the oxygen of the molten steel are higher, 300Kg of temperature-adjusting scrap steel and 1.1Kg/t of high-carbon ferromanganese are added in the decarburization period, the vacuum decarburization time is 14min, the temperature measurement and the oxygen determination are carried out after the decarburization are finished, the temperature is 1591 ℃, the oxygen activity is 375ppm, the subsequent deoxidation alloying is carried out, 1.62Kg/t of aluminum particles is added, and 1.2Kg/t of micro-carbon ferromanganese is added. The subsequent normal processing ends.
Example 4
The converter is normally controlled according to a converting model, sublance temperature measurement sampling is carried out at the converting terminal, the temperature is 1681 ℃, the oxygen activity at the terminal is 922ppm, the carbon at the terminal is 0.032%, the tapping requirement is met, tapping operation is carried out, the bottom blowing of the steel ladle is opened before tapping, the single-way flow is 300L/min, and 2.3Kg/t (according to the calculated molten steel amount) of small-particle lime is added into the tapping. RH refining is carried out, temperature measurement, sampling and oxygen determination are carried out at the station. The temperature is 1627 ℃, the oxygen activity is 875ppm, the temperature and the oxygen of the molten steel are higher, 800Kg of temperature-adjusting scrap steel is added in the decarburization period, the vacuum decarburization time is 14min, the temperature is measured after the decarburization is finished, the oxygen activity is 595ppm at 1600 ℃, the subsequent deoxidation and alloying are carried out, 2.2Kg/t of aluminum particles are added, and 3.80Kg/t of micro-carbon ferromanganese is added. The subsequent normal processing ends.
Comparative example
Controlling converter blowing, normally tapping after the blowing is finished, carrying out temperature measurement sampling at a refining station according to the arrival condition, if the temperature is low and the carbon is high, blowing oxygen to raise the temperature and decarbonize, and subsequently deoxidizing by using aluminum particles, and adding a micro-carbon ferromanganese and a low-carbon manganese alloy; if the temperature is normal, the oxygen is high, the normal decarburization is carried out, the subsequent deoxidation is carried out by using aluminum particles, and the micro-carbon ferromanganese and the low-carbon manganese metal alloy are added; if the temperature is higher and the oxygen is higher, the temperature-adjusting waste steel is added, normal decarburization is carried out, aluminum particles are used for deoxidation subsequently, and the micro-carbon ferromanganese and the low-carbon manganese metal alloy are added.
In the comparative example, the deoxidation of molten steel mainly uses the aluminum particle removal, which causes the cost to rise.
The applicant found that: the molten steel is often low in carbon and high in oxygen, and the new process utilizes the carbon of high-carbon ferromanganese to remove partial oxygen, thereby reducing the cost and simultaneously reducing Al in the molten steel 2 O 3 The generation of inclusions is realized, so that the quality of molten steel is improved; meanwhile, manganese in the high-carbon ferromanganese can also be partially deoxidized and alloyed.
The addition of the aluminum grain deoxidized alloy in the original process is obviously higher than that in the new process according to the embodiment data and the comparative example data, the price of the aluminum grain is 18000 yuan/t, the addition of the micro-carbon ferromanganese is higher than that in the new process, the price of the micro-carbon ferromanganese is 14000 yuan/t, and the price of the high-carbon ferromanganese is 5800 yuan/t. Therefore, the cost can be greatly reduced by comprehensive calculation.
One or more technical solutions in the embodiments of the present invention at least have the following technical effects or advantages:
(1) The method provided by the embodiment of the invention realizes low-cost production of the ultra-low carbon manganese-containing steel through converter end point control, alloying control in the tapping process, refining operation control and the like;
(2) The average cost of the ultra-low carbon manganese-containing steel produced by the method provided by the embodiment of the invention is reduced by 5.3 yuan/t, the production cost is reduced, and the cleanliness of molten steel and the quality of products are improved.
Finally, it should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (5)
1. A low-cost method for producing ultra-low carbon manganese-containing steel, comprising:
smelting molten iron in a converter to obtain molten steel, wherein the oxygen activity at the end point of the converter smelting is controlled to be more than or equal to 450ppm;
refining the molten steel to obtain refined molten steel;
continuously casting the refined molten steel to obtain ultra-low carbon manganese-containing steel;
wherein small-particle lime and a first high-carbon ferromanganese alloy are added during smelting and tapping of the converter; the addition amount of the small-particle lime is 1.5Kg/t steel to 3Kg/t steel; when the adding time of the first high-carbon ferromanganese alloy is 1/5 of the tapping amount, the adding amount of the first high-carbon ferromanganese alloy is determined according to the oxygen activity of the smelting end point of the converter, and when the oxygen activity is more than 900ppm, the adding amount of the first high-carbon ferromanganese alloy is 2Kg/t-2.5Kg/t; when the oxygen activity is more than 800ppm and less than or equal to 900ppm, the adding amount of the first high-carbon ferromanganese alloy is 1.5Kg/t-2Kg/t; when the oxygen activity is more than 700ppm and less than or equal to 800ppm, the adding amount of the first high-carbon ferromanganese alloy is 1Kg/t-1.5Kg/t; when the oxygen activity is more than 600ppm and less than or equal to 700ppm, the adding amount of the first high-carbon ferromanganese alloy is 0.5Kg/t-1Kg/t;
when the oxygen activity is more than 500ppm and less than or equal to 600ppm, the adding amount of the first high-carbon ferromanganese alloy is 0Kg/t-0.5Kg/t;
adding a second high-carbon ferromanganese alloy according to the oxygen activity of the molten steel arriving at the station before refining, and specifically comprises the following steps:
when the oxygen activity is more than 650ppm, the addition amount of the second high-carbon ferromanganese alloy is 1Kg/t steel to 2Kg/t steel;
when the oxygen activity is more than 550ppm and less than or equal to 650ppm, the adding amount of the second high-carbon ferromanganese alloy is 0.5Kg/t steel-1 Kg/t steel;
when the oxygen activity is more than 450ppm and less than or equal to 550ppm, the adding amount of the second high-carbon ferromanganese alloy is 0.2Kg/t steel-0.5 Kg/t steel;
when the oxygen activity is less than 450ppm, the addition amount of the second high-carbon ferromanganese alloy is 0Kg/t steel;
the total adding amount of the first high-carbon ferromanganese alloy and the second high-carbon ferromanganese alloy is controlled to be less than or equal to 4.5Kg/t of steel, and the carbon is less than or equal to 0.0025 percent after the ultra-low carbon steel is refined.
2. The method for low-cost production of ultra-low carbon manganese-containing steel as claimed in claim 1, wherein the end point temperature of said converter smelting is controlled at 1665-1685 ℃ and the end point carbon content of said converter smelting is controlled at < 0.06%.
3. The method for low-cost production of ultra-low carbon manganese-containing steel as claimed in claim 1, wherein said converter smelting employs a post-blowing operation when the end-point oxygen activity of said converter smelting is < 450 ppm.
4. The method for low-cost production of ultra-low carbon manganese-containing steel as claimed in claim 1, wherein single-pass bottom-blowing stirring with a flow rate > 150L/min is used during tapping in said converter.
5. The method for low-cost production of ultra-low carbon manganese-containing steel as claimed in claim 1, wherein the degree of vacuum in the decarburization period of the refining is controlled to be < 67Pa, and the circulation gas flow rate in the decarburization period of the refining is 2000L/min to 3200L/min.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111077933.7A CN113832285B (en) | 2021-09-15 | 2021-09-15 | Ultralow-carbon manganese-containing steel and low-cost production method thereof |
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