CN111004890A - Method for improving quality of low-carbon silicon killed steel in refining and smelting - Google Patents
Method for improving quality of low-carbon silicon killed steel in refining and smelting Download PDFInfo
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- CN111004890A CN111004890A CN201911219952.1A CN201911219952A CN111004890A CN 111004890 A CN111004890 A CN 111004890A CN 201911219952 A CN201911219952 A CN 201911219952A CN 111004890 A CN111004890 A CN 111004890A
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- refining
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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
- C21C7/064—Dephosphorising; Desulfurising
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- Organic Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The application discloses a method for improving quality of refining smelting low-carbon silicon killed steel, which comprises the steps of collecting the terminal oxygen content of a converter, transmitting the data of the molten steel oxygen content of a converter oxygen determination device to a first-level PLC (programmable logic controller), reading the oxygen data from a gateway PLC by a third-level system, displaying the data in a refining process, researching the relation between the terminal oxygen content of the converter and the optimal lime amount of a steel ladle capable of guaranteeing deoxidation and desulfurization, converting a production formula, and converting Si + O2=SiO2Calculating the total amount of lime added to every 100ppm of oxygen to be 2.0-6.6 kg/ton; when the oxygen content is lower than 300ppm, in order to ensure desulfurization, heat preservation and inclusion adsorption, the minimum lime addition required by the steel ladle is 2.0-3.0 kg/ton steel, and the lime amount is calculated by refining according to the final oxygen content of the converter and the requirement of the fourth step in the third step, so that the lime is supplemented in place at one time, the refining rhythm is accelerated, and the smelting quality is improved.
Description
Technical Field
The invention belongs to the technical field of converter steelmaking, and particularly relates to a method for improving the quality of low-carbon silicon killed steel by refining and smelting.
Background
When the low-carbon silicon killed steel is refined and smelted, the fluctuation of the converter end point is large, the oxidability fluctuation of molten steel is also large, and the oxygen content of the converter end point is 500ppm in some furnaces, 800ppm in some furnaces and 1000ppm in other furnaces. The habitual lime addition in refining can cause that lime is added for many times in the refining process of a furnace with high converter terminal oxygen to improve slag alkalinity for deoxidation and desulfurization, and can cause the production quality problems that molten steel or deoxidation defects in slow-paced continuous casting and the like cause plug rod erosion out of control, non-planned pouring stop, excessive blank oxygen and the like.
Disclosure of Invention
The technical problem to be solved is as follows: the application mainly provides a method for improving the quality of refining and smelting low-carbon silicon killed steel, and solves the technical problems that stopper erosion is out of control, casting is not planned to stop, oxygen of a blank exceeds the standard and the like in the prior art.
The technical scheme is as follows:
a method for improving the quality of refining and smelting low-carbon silicon killed steel comprises the following steps:
the first step is as follows: collecting the end point oxygen content of the converter by adopting oxygen determination equipment; the end point oxygen is transmitted to the first-stage PLC;
the second step is that: the three-level system reads and displays the oxygen data from the gateway PLC
The third step: researching the relation between the converter end point oxygen content and the optimum ladle lime amount capable of ensuring deoxidation and desulfurization, converting the production formula, Si + O2= SiO2Calculating the adding amount of the ladle lime to be 2.0-6.6 kg/ton;
the fourth step: when the oxygen content is lower than 300ppm, in order to ensure desulfurization, heat preservation and inclusion adsorption, the minimum lime addition required by the steel ladle is 2.0-3.0 kg per ton of steel;
the fifth step: and (3) accounting the lime amount in the refining according to the final oxygen content of the converter and the requirement of the fourth step in the third step, so that the lime is supplemented in place at one time, the refining rhythm is accelerated, and the smelting quality is improved.
As a preferred technical scheme of the invention: the data of the oxygen content of the molten steel of the converter oxygen determination equipment is transmitted to the first-level PLC, and the third-level system reads the oxygen data from the gateway PLC and displays the oxygen data in the refining process.
As a preferred technical scheme of the invention: and calculating the lime addition according to a terminal oxygen alkalinity balance method.
As a preferred technical scheme of the invention: the refining is completed in one step by adding lime according to a given method according to the terminal oxygen value of the converter, so that the slagging speed is increased, and the rhythm and the deoxidation effect are ensured.
As a preferred technical scheme of the invention: after the method is used on the low-carbon silicon deoxidized steel, the alkalinity of the slag can reach 2.5-3, the problem of large erosion of the stopper caused by poor deoxidation due to low alkalinity of the slag is solved, the frequency of refining and lime adding is greatly reduced, and the stability of the production rhythm is ensured.
Has the advantages that: compared with the prior art, the method for improving the quality of the refining and smelting low-carbon silicon killed steel has the following technical effects:
1. the refining is completed in one step by adding lime according to the given method according to the terminal oxygen value of the converter, the slagging speed is accelerated, and the rhythm and the deoxidation effect are ensured;
2. after the method is used on low-carbon silicon deoxidized steel, the alkalinity of the slag can reach 2.3-2.7, the problem of large erosion of the stopper caused by poor deoxidation due to low alkalinity of the slag is solved, the frequency of refining and lime adding is greatly reduced, and the stability of the production rhythm is ensured;
3. the refining calculates the lime amount according to the oxygen content at the end point of the converter and the requirement of the fourth step of the third step, so that the lime is supplemented in place at one time, the refining rhythm is accelerated, and the smelting quality is improved;
4. the production quality problems of plug rod erosion out of control, non-planned pouring stop, excessive blank oxygen and the like can not be caused.
Detailed Description
Example 1
A method for improving the quality of refining and smelting low-carbon silicon killed steel comprises the following steps:
the first step is as follows: collecting the end point oxygen content of the converter;
the second step is that: transmitting the information of the oxygen content at the end point of the converter to a system visible for the working procedure of the refining furnace;
the third step: study of the end-point oxygen content of the converterThe relation with the optimal lime content of the ladle capable of ensuring deoxidation and desulfurization, the conversion production formula of Si + O2= SiO2Calculating the adding amount of the ladle lime to be 2.0-6.6 kg/ton;
the fourth step: when the oxygen content is lower than 300ppm, in order to ensure desulfurization, heat preservation and inclusion adsorption, the minimum lime addition required by the steel ladle is 2.0-3.0 kg per ton of steel;
the fifth step: and (3) accounting the lime amount in the refining according to the final oxygen content of the converter and the requirement of the fourth step in the third step, so that the lime is supplemented in place at one time, the refining rhythm is accelerated, and the smelting quality is improved.
In this embodiment, the data of the oxygen content of molten steel in the converter oxygen determination device is transmitted to the first-level PLC, and the third-level system reads the oxygen data from the gateway PLC and displays the oxygen data in the refining process.
In this example, the lime addition was calculated according to the endpoint oxygen alkalinity balance method.
In the embodiment, the refining is completed in one step by adding lime according to the given method according to the terminal oxygen value of the converter, so that the slagging speed is increased, and the rhythm and the deoxidation effect are ensured.
In the embodiment, after the method is used on low-carbon silicon deoxidized steel, the alkalinity of the slag can reach 2.5-3.0, the problem of large erosion of the stopper caused by poor deoxidation due to low alkalinity of the slag is solved, the frequency of refining and lime adding is greatly reduced, and the stability of the production rhythm is ensured.
643ppm of converter end-point oxygen content, 305kg of BOF 2-active lime addition amount, 412 kg of refining process LF 1A-active lime, 0.029% of converter process sulfur content, 0.012% of sulfur content after refining (process requirement is less than or equal to 0.015%), 28ppm of finished product detected oxygen content.
Example 2
A method for improving the quality of refining and smelting low-carbon silicon killed steel comprises the following steps:
the first step is as follows: collecting the end point oxygen content of the converter;
the second step is that: transmitting the information of the oxygen content at the end point of the converter to a system visible for the working procedure of the refining furnace;
the third step: study of the converter end point oxygen content andthe relation of the optimal lime content of the steel ladle for deoxidation and desulfurization can be ensured, the production formula is converted, and Si + O2= SiO2Calculating the adding amount of the ladle lime to be 2.0-6.6 kg/ton;
the fourth step: when the oxygen content is lower than 300ppm, in order to ensure desulfurization, heat preservation and inclusion adsorption, the minimum lime addition required by the steel ladle is 2.0-3.0 kg per ton of steel;
the fifth step: and (3) accounting the lime amount in the refining according to the final oxygen content of the converter and the requirement of the fourth step in the third step, so that the lime is supplemented in place at one time, the refining rhythm is accelerated, and the smelting quality is improved.
In this embodiment, the data of the oxygen content of molten steel in the converter oxygen determination device is transmitted to the first-level PLC, and the third-level system reads the oxygen data from the gateway PLC and displays the oxygen data in the refining process.
In this example, the lime addition was calculated according to the endpoint oxygen alkalinity balance method.
In the embodiment, the refining is completed in one step by adding lime according to the given method according to the terminal oxygen value of the converter, so that the slagging speed is increased, and the rhythm and the deoxidation effect are ensured.
In the embodiment, after the method is used on low-carbon silicon deoxidized steel, the alkalinity of the slag can reach 2.3-2.7, the problem of large erosion of the stopper caused by poor deoxidation due to low alkalinity of the slag is solved, the frequency of refining and lime adding is greatly reduced, and the stability of the production rhythm is ensured.
288ppm of converter end point oxygen content, 203kg of BOF 2-active lime addition amount in a converter procedure, 245 kg of refining procedure LF 1A-active lime, 0.010 percent of converter procedure sulfur content, 0.005 percent of sulfur content after refining (process requirement is less than or equal to 0.012 percent), and 20ppm of finished product detected oxygen content.
Example 3
A method for improving the quality of refining and smelting low-carbon silicon killed steel comprises the following steps:
the first step is as follows: collecting the end point oxygen content of the converter;
the second step is that: transmitting the information of the oxygen content at the end point of the converter to a system visible for the working procedure of the refining furnace;
the third step: research on the oxygen content and energy at the end point of the converterEnsuring the relation of the optimal lime content of the deoxidized and desulfurized ladle, converting the production formula, Si + O2= SiO2Calculating the adding amount of the ladle lime to be 2.0-6.6 kg/ton;
the fourth step: when the oxygen content is lower than 300ppm, in order to ensure desulfurization, heat preservation and inclusion adsorption, the minimum lime addition required by the steel ladle is 2.0-3.0 kg per ton of steel;
the fifth step: and (3) accounting the lime amount in the refining according to the final oxygen content of the converter and the requirement of the fourth step in the third step, so that the lime is supplemented in place at one time, the refining rhythm is accelerated, and the smelting quality is improved.
In this embodiment, the data of the oxygen content of molten steel in the converter oxygen determination device is transmitted to the first-level PLC, and the third-level system reads the oxygen data from the gateway PLC and displays the oxygen data in the refining process.
In this example, the lime addition was calculated according to the endpoint oxygen alkalinity balance method.
In the embodiment, the refining is completed in one step by adding lime according to the given method according to the terminal oxygen value of the converter, so that the slagging speed is increased, and the rhythm and the deoxidation effect are ensured.
In the embodiment, after the method is used on low-carbon silicon deoxidized steel, the alkalinity of the slag can reach 2.3-2.7, the problem of large erosion of the stopper caused by poor deoxidation due to low alkalinity of the slag is solved, the frequency of refining and lime adding is greatly reduced, and the stability of the production rhythm is ensured.
508ppm of converter end-point oxygen content, 303kg of BOF 2-active lime addition amount in a converter procedure, 403 kg of refining procedure LF 1A-active lime, 0.015 percent of converter procedure sulfur content, 0.008 percent of sulfur content after refining (the process requirement is less than or equal to 0.015 percent), and 23ppm of finished product detected oxygen content.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (5)
1. The method for improving the quality of the low-carbon silicon killed steel obtained by refining and smelting is characterized by comprising the following steps:
the first step is as follows: collecting the end point oxygen content of the converter;
the second step is that: transmitting the information of the oxygen content at the end point of the converter to a system visible for the working procedure of the refining furnace;
the third step: researching the relation between the converter end point oxygen content and the optimum ladle lime amount capable of ensuring deoxidation and desulfurization, converting the production formula, Si + O2= SiO2Calculating the total amount of lime added to every 100ppm of oxygen to be 2.0-6.6 kg/ton;
the fourth step: when the oxygen content is lower than 300ppm, in order to ensure desulfurization, heat preservation and inclusion adsorption, the minimum lime addition required by the steel ladle is 2.0-3.0 kg per ton of steel;
the fifth step: and (3) accounting the lime amount in the refining according to the final oxygen content of the converter and the requirement of the fourth step in the third step, so that the lime is supplemented in place at one time, the refining rhythm is accelerated, and the smelting quality is improved.
2. The method for improving the quality of the refinery-smelted low-carbon silicon-killed steel as claimed in claim 1, wherein: the data of the oxygen content of the molten steel of the converter oxygen determination equipment is transmitted to the first-level PLC, and the third-level system reads the oxygen data from the gateway PLC and displays the oxygen data in the refining process.
3. The method for improving the quality of the refinery-smelted low-carbon silicon-killed steel as claimed in claim 1, wherein: and calculating the lime addition according to a terminal oxygen alkalinity balance method.
4. The method for improving the quality of the refinery-smelted low-carbon silicon-killed steel as claimed in claim 1, wherein: the refining is completed in one step by adding lime according to a given method according to the terminal oxygen value of the converter, so that the slagging speed is increased, the desulfurization and deoxidation effects are ensured, and the smelting rhythm is accelerated.
5. The method for improving the quality of the refinery-smelted low-carbon silicon-killed steel as claimed in claim 1, wherein: after the method is used on the low-carbon silicon deoxidized steel, the alkalinity of the slag can reach 2.5-3, the problem of serious erosion of the stopper caused by poor deoxidation due to low alkalinity of the slag is solved, the frequency of refining and lime adding is greatly reduced, and the stability of the production rhythm is ensured.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911219952.1A CN111004890A (en) | 2019-12-03 | 2019-12-03 | Method for improving quality of low-carbon silicon killed steel in refining and smelting |
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| CN201911219952.1A CN111004890A (en) | 2019-12-03 | 2019-12-03 | Method for improving quality of low-carbon silicon killed steel in refining and smelting |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4746361A (en) * | 1987-04-03 | 1988-05-24 | Inland Steel Company | Controlling dissolved oxygen content in molten steel |
| KR20050060816A (en) * | 2003-12-17 | 2005-06-22 | 주식회사 포스코 | Refining method of ultra low carbon steel used in manufacturing two piece can |
| CN102268513A (en) * | 2011-06-30 | 2011-12-07 | 攀钢集团有限公司 | Method for improving castability of molten steel of medium and low carbon steel |
| CN109576441A (en) * | 2018-12-21 | 2019-04-05 | 首钢京唐钢铁联合有限责任公司 | RH refining method for controlling wettability of inclusions in low-carbon aluminum killed steel |
| CN110484681A (en) * | 2018-03-27 | 2019-11-22 | 上海梅山钢铁股份有限公司 | A kind of production method of low carbon low silicon aluminium killed steel water |
-
2019
- 2019-12-03 CN CN201911219952.1A patent/CN111004890A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4746361A (en) * | 1987-04-03 | 1988-05-24 | Inland Steel Company | Controlling dissolved oxygen content in molten steel |
| KR20050060816A (en) * | 2003-12-17 | 2005-06-22 | 주식회사 포스코 | Refining method of ultra low carbon steel used in manufacturing two piece can |
| CN102268513A (en) * | 2011-06-30 | 2011-12-07 | 攀钢集团有限公司 | Method for improving castability of molten steel of medium and low carbon steel |
| CN110484681A (en) * | 2018-03-27 | 2019-11-22 | 上海梅山钢铁股份有限公司 | A kind of production method of low carbon low silicon aluminium killed steel water |
| CN109576441A (en) * | 2018-12-21 | 2019-04-05 | 首钢京唐钢铁联合有限责任公司 | RH refining method for controlling wettability of inclusions in low-carbon aluminum killed steel |
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Application publication date: 20200414 |
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