CN114318113A - Slag washing direct-upward continuous casting production process of hot rolled steel converter - Google Patents
Slag washing direct-upward continuous casting production process of hot rolled steel converter Download PDFInfo
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- CN114318113A CN114318113A CN202111546714.9A CN202111546714A CN114318113A CN 114318113 A CN114318113 A CN 114318113A CN 202111546714 A CN202111546714 A CN 202111546714A CN 114318113 A CN114318113 A CN 114318113A
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Abstract
A slag washing direct-upward continuous casting production process of a hot rolled steel converter. Relates to the technical field of metallurgy, in particular to a smelting method of hot rolled steel. The molten steel deoxidizer of the invention changes silicon-aluminum mixture into pure aluminum, so that the deoxidized product is converted into Al from silicon-aluminum composite oxidized product2O3The product was collected. For removing Al2O3There are two main ways to concentrate the product: 1. physical deslagging in early slagging; 2. adding calcium wire before pouring molten steel to let Al2O3The product is combined with Ca to produce 7Al2O312CaO compounds. The ladle slag is alkaline reductive white slag, can adsorb impurities in molten steel, and can ensure that the molten steel is not secondarily oxidized.The invention compresses the refining procedure in the original production mode to the converter argon station to complete, thereby achieving the purposes of saving the energy consumption and the production cost of the refining procedure, improving the production efficiency and the like.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to a smelting method of hot rolled steel.
Background
The hot rolled blank mainly comprises: low carbon 235, national standard 235, 195 series, SPHC (cold rolled stock), etc.; the thickness of the hot rolled blank is 1.5-9.0mm, so the elongation property and cold bending property of the steel material are requiredThe calculation is relatively high; when the steel is produced, various manufacturers can properly increase the content of Als (acid molten aluminum) according to the range of national standard requirements, and the general requirement is between 0.015% and 0.045% so as to optimize the performance of the steel and meet the requirements of customers. The increase of Als becomes a key technology in the whole smelting process, and original manufacturers adopt the LF refining process to control the molten steel Als and reduce Al in the molten steel2O3Content, and the purpose of ensuring casting stability is achieved.
The method comprises the following two specific steps:
1. smelting initial components by adopting a converter, and tapping at the temperature;
2. refining and desulfurizing the molten steel by an LF refining furnace, adjusting components, removing impurities in the molten steel by secondary slagging, and carrying out light calcium treatment on the molten steel to promote the denaturation of the impurities and meet the pouring requirement;
3. after refining, adjusting the components and casting continuously at the temperature.
However, in the refining process, refining electrodes are needed for heating and slagging, so that the purposes of improving the purity of molten steel and meeting the requirements of steel grades are achieved, the power consumption is about 45 degrees/ton, and the refining cost is about 45 yuan/ton. The whole refining process consumes a large amount of electric energy, and does not meet the energy-saving and efficient production requirements.
Disclosure of Invention
Aiming at the problems, the invention provides the slag washing direct-upward continuous casting production process of the hot rolled steel converter, which can save a large amount of energy and production cost without refining molten steel by using an LF refining furnace.
The technical scheme of the invention is as follows: a converter slag washing direct-upward continuous casting production process for hot rolled steel comprises the following steps:
s1, adding molten iron into the converter, and adjusting the components and the temperature of the molten steel before tapping;
s2, alloying, deoxidizing and slagging the molten steel in the tapping process;
s3, carrying out slag washing on the ladle top slag;
s4, carrying out heavy calcium treatment on the molten steel;
and S5, continuously casting on the molten steel, and pouring.
In the process of the step S1, the weight percentage of Si in the molten iron is less than or equal to 0.70 percent, the weight percentage of P is less than or equal to 0.120 percent, and the weight percentage of waste slag is less than 0.50 percent;
the weight percentage of C in the molten steel is more than or equal to 0.065%, the weight percentage of P is less than or equal to 0.020%, and the weight percentage of S is less than or equal to 0.020%;
the temperature of the molten steel is 30-40 ℃ higher than that of the molten steel of refined steel.
In the step S2, FeMn65Si17 is added into a ladle during tapping, and the addition amount of the FeMn65Si17 is as follows: 3.5-4.0 Kg/T;
simultaneously adding aluminum ingots into the ladle, wherein the addition amount of the aluminum ingots is as follows: 0.6 to 1.2 Kg/T;
adding lime into a molten steel impact area when molten steel tapping enters a ladle 1/3, wherein the addition amount of the lime is as follows: 300-500 Kg;
argon is blown to the bottom of the ladle in the whole tapping process.
In the step S3, after the ladle top slag reaction is completed, adding pure aluminum scrap into the top slag, where the adding amount of the pure aluminum scrap is: 30-60 Kg/furnace;
and blowing argon gas to the bottom of the steel ladle until the slag washing is finished, and continuing for 8-12 min.
In the step S4, argon blowing from the ladle is stopped, and a calcium wire is added to the molten steel, wherein the addition amount of the calcium wire is as follows: 1.5-2.5 m/T;
after the calcium line is added, opening a steel ladle to blow argon, wherein the argon blowing time is more than or equal to 3 min;
the molten steel is shielded by the top slag in the step S4.
According to the invention, the slagging process is advanced, and the refined bottom slag is manufactured by means of tapping molten steel impact in the tapping process; then soft blowing is carried out at an argon station, aluminum scraps and lime are reasonably matched to form slag washing materials, and the bottom slag is subjected to a slag washing process, so that the refining purpose is achieved. The purposes of desulfurizing, reducing, slagging and adsorbing harmful impurities are achieved by secondary slagging through submerged arc operation without the help of the action of an LF electrode in an LF refining furnace.
The molten steel deoxidizer of the invention changes silicon-aluminum mixture into pure aluminum, so that the deoxidized product is converted into Al from silicon-aluminum composite oxidized product2O3The product was collected.For removing Al2O3There are two main ways to concentrate the product: 1. physical deslagging in early slagging; 2. adding calcium wire before pouring molten steel to let Al2O3The product is combined with Ca to produce 7Al2O312CaO compounds. The ladle slag is alkaline reductive white slag, can adsorb impurities in molten steel, and can ensure that the molten steel is not secondarily oxidized.
The invention compresses the refining procedure in the original production mode to the converter argon station to complete, thereby achieving the purposes of saving the energy consumption and the production cost of the refining procedure, improving the production efficiency and the like.
Detailed Description
A converter slag washing direct-upward continuous casting production process for hot rolled steel comprises the following steps:
s1, adding molten iron into the converter, and adjusting the components and the temperature of the molten steel before tapping;
s2, alloying, deoxidizing and slagging the molten steel in the tapping process;
s3, carrying out slag washing on the ladle top slag;
s4, carrying out heavy calcium treatment on the molten steel;
and S5, continuously casting on the molten steel, and pouring.
According to the invention, the slagging process is advanced, and the refined bottom slag is manufactured by means of tapping molten steel impact in the tapping process; then soft blowing is carried out at an argon station, aluminum scraps and lime are reasonably matched to form slag washing materials, and the bottom slag is subjected to a slag washing process, so that the refining purpose is achieved. The purposes of desulfurizing, reducing, slagging and adsorbing harmful impurities are achieved by secondary slagging through submerged arc operation without the help of the action of an LF electrode in an LF refining furnace.
In the process of step S1, the weight percentage of Si in the molten iron is less than or equal to 0.70 percent, the weight percentage of P is less than or equal to 0.120 percent, and the weight percentage of waste slag is less than 0.50 percent;
the weight percentage of C in the molten iron is more than or equal to 0.065%, the weight percentage of P is less than or equal to 0.020%, the weight percentage of S is less than or equal to 0.020%, the components of Si and P in the molten iron are adjusted, the content of harmful components is reduced, and the preparation for processing the molten iron into the molten steel is completed;
the temperature of the molten steel is 30-40 ℃ higher than that of the molten steel of refined steel, so that the phenomenon that the continuous casting production is influenced due to the fact that the temperature of the molten steel is too low due to the fact that slagging materials are added subsequently is avoided.
In step S2, FeMn65Si17 is added into the ladle during tapping, and the addition amount of FeMn65Si17 is as follows: 3.5-4.0 Kg/T, and FeMn65Si17 is used for adjusting the content of Mn so that the molten steel meets the quality standard of steel;
simultaneously, adding aluminum ingots into the steel ladle, wherein the addition amount of the aluminum ingots is as follows: 0.6-1.2 Kg/T of aluminum ingot used for deoxidizing the molten steel;
when molten steel tapping enters a ladle 1/3, lime is added into a molten steel impact area, and the addition amount of the lime is as follows: 300-500 Kg, lime 85% CaO, 15% CaCO3For reaction with Al2O3Slagging, namely improving the viscosity and alkalinity of the slag, adsorbing impurities, aluminum oxide and the like so as to facilitate subsequent physical slag removal;
argon is blown to the bottom of the steel ladle in the whole tapping process, so that the effects of stirring and oxidation resistance are achieved.
The molten steel deoxidizer of the invention changes silicon-aluminum mixture into pure aluminum, so that the deoxidized product is converted into Al from silicon-aluminum composite oxidized product2O3The product was collected.
In step S3, after the ladle top slag reaction is completed, aluminum scrap is continuously added to the top slag, and the addition amount of the aluminum scrap is as follows: 30-60 Kg/furnace, further deoxidizing the top slag to form Al2O3；
And blowing argon gas to the bottom of the steel ladle until the slag washing is finished, and continuing for 8-12 min.
In step S4, the ladle is turned off to blow argon gas, and a calcium wire is added to the molten steel, wherein the addition amount of the calcium wire is as follows: 1.5-2.5 m/T, wherein the calcium line is a wire rod with pure calcium wrapped by an outer iron sheet, the calcium line added into the molten steel reacts with residual oxygen in the molten steel to generate CaO, and then the CaO reacts with Al2O3Continued generation of 7Al2O312 CaO; the calcium wire can make inclusion (Al) in molten steel2O3) Denaturation, generation of large particles and easy floating of 7Al2O312CaO, avoidance of inclusions (Al)2O3) Nodulation at a ladle nozzle;
after the calcium line is added, opening a steel ladle to blow argon gas, and stirring, wherein the argon gas blowing time is more than or equal to 3 min;
the molten steel is shielded by the top slag in the step S4, and the ladle slag is alkaline reductive white slag which is used for isolating air, absorbing impurities in the molten steel and ensuring that the molten steel is not secondarily oxidized.
Claims (5)
1. A converter slag washing direct-upward continuous casting production process for hot rolled steel is characterized by comprising the following steps:
s1, adding molten iron into the converter, and adjusting the components and the temperature of the molten steel before tapping;
s2, alloying, deoxidizing and slagging the molten steel in the tapping process;
s3, carrying out slag washing on the ladle top slag;
s4, carrying out heavy calcium treatment on the molten steel;
and S5, continuously casting on the molten steel, and pouring.
2. The hot rolled steel converter slag washing direct upward continuous casting production process of claim 1, wherein in the step S1, the weight percentage of Si in the molten iron is less than or equal to 0.70%, the weight percentage of P is less than or equal to 0.120%, and the weight percentage of waste slag is less than 0.50%;
the weight percentage of C in the molten steel is more than or equal to 0.065%, the weight percentage of P is less than or equal to 0.020%, and the weight percentage of S is less than or equal to 0.020%;
the temperature of the molten steel is 30-40 ℃ higher than that of the molten steel of refined steel.
3. The hot rolled steel converter slag washing direct-upward continuous casting production process of claim 1, wherein in the step S2, FeMn65Si17 is added into a ladle during steel tapping, and the addition amount of the FeMn65Si17 is as follows: 3.5-4.0 Kg/T;
simultaneously adding aluminum ingots into the ladle, wherein the addition amount of the aluminum ingots is as follows: 0.6 to 1.2 Kg/T;
adding lime into a molten steel impact area when molten steel tapping enters a ladle 1/3, wherein the addition amount of the lime is as follows: 300-500 Kg;
argon is blown to the bottom of the ladle in the whole tapping process.
4. The converter slag washing direct-upward continuous casting production process of hot rolled steel as claimed in claim 1, characterized in that in step S3, after the reaction of the ladle top slag is completed, pure aluminum chips are continuously added into the top slag, and the addition amount of the pure aluminum chips is as follows: 30-60 Kg/furnace;
and blowing argon gas to the bottom of the steel ladle until the slag washing is finished, and continuing for 8-12 min.
5. The hot rolled steel converter slag washing direct-upward continuous casting production process of claim 1, wherein in the step S4, the ladle is closed to blowing argon gas, a calcium wire is added into the molten steel, and the addition amount of the calcium wire is as follows: 1.5-2.5 m/T;
after the calcium line is added, opening a steel ladle to blow argon, wherein the argon blowing time is more than or equal to 3 min;
the molten steel is shielded by the top slag in the step S4.
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| CN202111546714.9A CN114318113A (en) | 2021-12-17 | 2021-12-17 | Slag washing direct-upward continuous casting production process of hot rolled steel converter |
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| CN202111546714.9A CN114318113A (en) | 2021-12-17 | 2021-12-17 | Slag washing direct-upward continuous casting production process of hot rolled steel converter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117488184A (en) * | 2023-10-31 | 2024-02-02 | 唐山东华钢铁企业集团有限公司 | A method of using silicon-killed steel ladle slag modifier directly in the converter |
| CN118600149A (en) * | 2024-08-09 | 2024-09-06 | 山西建龙实业有限公司 | A method for producing small-section aluminum-containing square billet by slag washing and direct-lifting technology |
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2021
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117488184A (en) * | 2023-10-31 | 2024-02-02 | 唐山东华钢铁企业集团有限公司 | A method of using silicon-killed steel ladle slag modifier directly in the converter |
| CN118600149A (en) * | 2024-08-09 | 2024-09-06 | 山西建龙实业有限公司 | A method for producing small-section aluminum-containing square billet by slag washing and direct-lifting technology |
| CN118600149B (en) * | 2024-08-09 | 2024-11-01 | 山西建龙实业有限公司 | A method for producing small-section aluminum-containing square billet by slag washing and direct-lifting technology |
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Application publication date: 20220412 |