CN113664171A - Method for controlling quality of continuous casting head blank - Google Patents
Method for controlling quality of continuous casting head blank Download PDFInfo
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- CN113664171A CN113664171A CN202110973594.4A CN202110973594A CN113664171A CN 113664171 A CN113664171 A CN 113664171A CN 202110973594 A CN202110973594 A CN 202110973594A CN 113664171 A CN113664171 A CN 113664171A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/116—Refining the metal
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/116—Refining the metal
- B22D11/117—Refining the metal by treating with gases
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/18—Controlling or regulating processes or operations for pouring
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- 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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Abstract
The invention relates to the field of continuous casting head blank production, and discloses a method for controlling the quality of a continuous casting head blank, which comprises the following steps: (1) feeding electricity to the refining position for one time, and adding refined lime; (2) the deep vacuum degree of the vacuum position is less than or equal to 67Pa, and the time is more than or equal to 5 min; (3) coating the tundish, and controlling the temperature to be between 100 and 200 ℃; (4) baking the tundish: baking with small fire, and baking with medium fire and large fire; (5) argon blowing operation, namely performing argon blowing operation on the impact area and the pouring area by using an argon blowing pipe, wherein the pressure of the argon is more than 1.0MPa, and the argon blowing time of each area is less than 3 min; (6) the liquid level of the tundish reaches the casting liquid level, and casting operation is carried out; (7) and carrying out continuous casting and blank forming operations. The invention solves the problem of poor quality of the continuous casting head blank in the prior art and improves the purity of the head blank quality.
Description
Technical Field
The invention belongs to the field of continuous casting head blank production, and particularly relates to a method for controlling the quality of a continuous casting head blank.
Background
Continuous casting has high production efficiency and low production cost, is one of the indispensable important processes of various iron and steel enterprises, and develops with continuous casting technology. With the increasing demand for steel quality, continuous casting tundishes have not been used as a single storage for molten steel, separate molten steel, etc. as one of the main continuous casting devices. The concept of tundish metallurgy is more and more emphasized by people. It plays a decisive role in purifying molten steel. However, when the sliding plate for pouring the ladle molten steel is opened in the initial stage of continuous casting and then the molten steel is poured into the tundish, the molten steel not only contacts with and erodes the refractory material on the inner wall of the tundish to cause secondary pollution of the molten steel, but also the tundish brings a large amount of oxygen content in the baking stage to ensure that the molten steel is secondarily oxidized to form a large amount of MnO and Al2O3Inclusions contaminate the pure molten steel.
Disclosure of Invention
The invention provides a method for controlling the quality of a continuous casting head blank, which aims to solve the problem of poor quality of the continuous casting head blank in the prior art.
The technical scheme of the invention is as follows: a method of controlling the quality of a continuous casting head blank, the method comprising the steps of:
(1) 300-400kg of refined lime, 0-100kg of deoxidized and desulfurized refining slag and 70-80kg of mixed deoxidizer are added into the refining site by one-time electrification; raising the temperature of the molten steel, sampling, and adjusting the components until the S content of the steel grade is less than or equal to 0.005 percent;
(2) the deep vacuum degree of the vacuum position is less than or equal to 67Pa, and the time is more than or equal to 5 min; after vacuum is broken, adding a heat insulating agent to the surface of the molten steel to start soft blowing, wherein the soft blowing time is prolonged by 10-12min compared with the normal casting heat;
(3) coating the tundish, and controlling the temperature to be between 100 and 200 ℃ and the time to be less than 1.5 hours;
(4) baking the tundish: baking with soft fire for 0.5-1 hr when the flame length is 300 mm; baking for 1-1.2 hours when the flame length is 500 mm; the baking time is more than 1 hour when the flame length is 700 mm; baking with medium fire, wherein the flame length is 0.5-0.8 hour from the bottom of the ladle to the cover of the ladle, and the time from the bottom of the ladle to the cover of the ladle is more than 0.5 hour; baking with big fire, returning the flame length from the ladle bottom to the ladle cover, gradually opening the air volume valve to the maximum when the baking is dark red, wherein the air volume is based on that the flame length returns to 100mm above the ladle cover, and the baking time is longer than 2 hours; wherein the baking temperature of the tundish in the impact area is more than or equal to 1200 ℃; the temperature of a casting area is more than or equal to 1050 ℃; baking the tundish nozzle to be more than or equal to 950 ℃;
(5) argon blowing operation, namely performing argon blowing operation on the impact area and the pouring area by using an argon blowing pipe, wherein the pressure of the argon is more than 1.0MPa, and the argon blowing time of each area is less than 3 min;
(6) the liquid level of the tundish reaches the casting liquid level, and casting operation is carried out;
(7) and carrying out continuous casting and blank forming operations.
The mixed deoxidizer consists of aluminum particles, silicon carbide and carbon powder.
The sampling condition in the step (1) is to sample under the condition that the temperature of the molten steel is 30-40 ℃ higher than the liquidus temperature.
After the components are adjusted in the step (1), if the component content does not enter the internal control requirement, secondary power supply heating is carried out, and the Al component in the steel is controlled to be 0.025-0.035%.
And (3) controlling the stable summer temperature of the coating tundish in the step (3) to be between 100 ℃ and 200 ℃, and controlling the temperature to be not less than 100 ℃ in winter.
Naturally preserving the tundish in the step (3) for more than 4 hours in summer after the coating construction of the tundish is finished; naturally preserving in winter for more than 6 hours.
In the step (3), water is used for mixing coating materials in the tundish coating construction, and the water temperature is 10-40 ℃; when the materials are mixed, the adding amount of the materials is less than 550 Kg/roller each time, the adding amount of the water is 15-18%, the dry materials are added into the roller and stirred for 1-2 minutes, then the water is added, and the materials are discharged after being stirred for 10-15 minutes.
Opening a ladle sliding nozzle, receiving drainage sand, quickly sleeving the ladle sliding nozzle into a long nozzle, and vertically hanging the ladle sliding nozzle; introducing argon at a flow rate of 20-40L/min, and adding a tundish covering agent into the tundish to ensure that the molten steel does not contact air along with the increase of the tonnage of the molten steel in the tundish; and when the liquid level of the tundish reaches the casting liquid level, casting, and maintaining the normal casting speed of the casting speed to be stable to finish casting.
And (5) after the casting operation in the step (6), increasing the residence time of the molten steel in the tundish for 10-30 min.
And (5) after the casting operation in the step (6), increasing the residence time of the molten steel in the tundish for 12-20 min.
The invention has the beneficial effects that:
according to the invention, the purity of the molten steel at the refining position is controlled, so that impurities in the steel can float sufficiently, and the purity of the molten steel can meet the pouring requirement; through measures such as tundish building, baking, pretreatment and the like, the content of harmful gas in steel can be reduced, the molten steel is ensured not to be exposed in the soft blowing stage, and Al formed by the contact of the molten steel and air is reduced2O3The inclusions reduce the generation of inclusions in the steel. The invention improves the quality of the furnace end blank of the pouring head, improves the purity of the quality of the head blank, solves the problem of poor quality of the continuous casting head blank, and meets the rolling requirement.
Drawings
FIG. 1 is a graph showing the inclusion content obtained without the method of the present invention;
FIG. 2 is a graph showing the inclusion content obtained by the method of the present invention.
Detailed Description
The technical solutions of the present invention are further described below with reference to the following examples, but the present invention is not limited thereto, and any modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention. The process equipment or apparatus not specifically mentioned in the following examples are conventional in the art, and if not specifically mentioned, the raw materials and the like used in the examples of the present invention are commercially available; unless otherwise specified, the technical means used in the examples of the present invention are conventional means well known to those skilled in the art.
The invention provides a method for controlling the quality of a continuous casting head blank, which comprises the following steps:
(1) 300-400kg of refined lime, 0-100kg of deoxidized and desulfurized refining slag and 70-80kg of mixed deoxidizer are added into the refining site by one-time electrification; raising the temperature of the molten steel, sampling, and adjusting the components until the S content of the steel grade is less than or equal to 0.005 percent;
(2) the deep vacuum degree of the vacuum position is less than or equal to 67Pa, and the time is more than or equal to 5 min; after vacuum is broken, adding a heat insulating agent to the surface of the molten steel to start soft blowing, wherein the soft blowing time is prolonged by 10-12min compared with the normal casting heat;
(3) coating the tundish, and controlling the temperature to be between 100 and 200 ℃ and the time to be less than 1.5 hours;
(4) baking the tundish: baking with soft fire for 0.5-1 hr when the flame length is 300 mm; baking for 1-1.2 hours when the flame length is 500 mm; the baking time of the flame length of 700mm is longer than that of the flame length of 700 mm; baking with medium fire, wherein the flame length is 0.5-0.8 hour from the bottom of the ladle to the cover of the ladle, and the time from the bottom of the ladle to the cover of the ladle is more than 0.5 hour; baking with big fire, returning the flame length from the ladle bottom to the ladle cover, gradually opening the air volume valve to the maximum when the baking is dark red, wherein the air volume is based on that the flame length returns to 100mm above the ladle cover, and the baking time is longer than 2 hours; wherein the baking temperature of the tundish in the impact area is more than or equal to 1200 ℃; the temperature of a casting area is more than or equal to 1050 ℃; baking the tundish nozzle to be more than or equal to 950 ℃; the tundish is baked, so that the baking temperature of the tundish is ensured, and the molten steel is not easy to be quenched and suddenly heated when contacting the molten steel;
(5) argon blowing operation, namely performing argon blowing operation on the impact area and the pouring area by using an argon blowing pipe, wherein the pressure of the argon is more than 1.0MPa, and the argon blowing time of each area is less than 3 min; protective pouring is carried out on the continuous casting position, and the molten steel is prevented from being secondarily oxidized to form inclusion mixed in the molten steel in the pouring process;
(6) the liquid level of the tundish reaches the casting liquid level, and casting operation is carried out;
(7) and carrying out continuous casting and blank forming operations.
The mixed deoxidizer consists of aluminum particles, silicon carbide and carbon powder.
The sampling condition in the step (1) is to sample under the condition that the temperature of the molten steel is 30-40 ℃ higher than the liquidus temperature.
After the components are adjusted in the step (1), if the component content does not enter the internal control requirement, secondary power supply heating is carried out, and the Al component in the steel is controlled to be 0.025-0.035%.
The stable summer temperature of the coating tundish in the step (3) is controlled to be between 100 ℃ and 200 ℃, and the winter temperature is not less than 100 ℃; the coating material of the middle ladle is completely stuck on the ladle wall, and the refractory material is not easy to fall off.
Naturally preserving the tundish in the step (3) for more than 4 hours in summer after the coating construction of the tundish is finished; naturally preserving in winter for more than 6 hours.
In the step (3), water is used for mixing coating materials in the tundish coating construction, and the water temperature is 10-40 ℃; when the tundish coating material is mixed, the adding amount is less than 550 Kg/roller each time, the adding amount is 15-18%, the dry material is added into the roller and stirred for 1-2 minutes, then water is added, and the mixture is discharged after being stirred for 10-15 minutes, so that the falling of refractory materials and the pollution to molten steel can be reduced.
Opening a ladle sliding nozzle, receiving drainage sand, quickly sleeving the ladle sliding nozzle into a long nozzle, and vertically hanging the ladle sliding nozzle; introducing argon at a flow rate of 20-40L/min, and adding a tundish covering agent into the tundish to ensure that the molten steel does not contact air along with the increase of the tonnage of the molten steel in the tundish; and when the liquid level of the tundish reaches the casting liquid level, casting, and maintaining the normal casting speed of the casting speed to be stable to finish casting. The ladle drainage sand is taken to prevent the drainage sand from flowing into the ladle to pollute molten steel and influence the purity of the molten steel.
And (5) after the casting operation in the step (6), increasing the residence time of the molten steel in the tundish for 10-30 min.
And (5) after the casting operation in the step (6), increasing the residence time of the molten steel in the tundish for 12-20 min.
Example 1
A method for controlling the quality of a continuous casting head blank.
The technical scheme of the invention is as follows: a method of controlling the quality of a continuous casting head blank, the method comprising the steps of:
(1) 300kg of refined lime, 100kg of deoxidized and desulfurized refining slag and 80kg of mixed deoxidizer are added into the refining position by one-time electrification; raising the temperature of the molten steel, sampling, and adjusting the components until the S content of the steel grade is 0.001%;
(2) the deep vacuum degree of the vacuum position is 67Pa, and the time is 5 min; after vacuum is broken, adding a heat insulating agent to the surface of the molten steel to start soft blowing, wherein the soft blowing time is prolonged by 10min compared with a normal casting heat;
(3) coating the tundish, and controlling the temperature to be between 100 ℃ and the time to be less than 1.5 hours;
(4) baking the tundish: baking with soft fire for 0.5 hour when the flame length is 300 mm; baking for 1 hour when the flame length is 500 mm; the flame length is 700mm, and the baking time is 3 hours; baking with medium fire, wherein the flame length is 0.5 hour from the bottom of the ladle to the cover of the ladle, and the baking time is more than 0.5 hour from the bottom of the ladle to the cover of the ladle; baking with big fire, returning the flame length from the ladle bottom to the ladle cover, gradually opening the air volume valve to the maximum when the baking is dark red, wherein the air volume is based on that the flame length returns to 100mm above the ladle cover, and the baking time is longer than 2 hours; wherein the baking temperature of the tundish in the impact area is 1200 ℃; the temperature of a casting area is 1050 ℃; baking the tundish nozzle to 950 ℃;
(5) argon blowing operation, namely performing argon blowing operation on the impact area and the pouring area by using an argon blowing pipe, wherein the pressure of the argon is more than 1.0MPa, and the argon blowing time of each area is less than 3 min;
(6) the liquid level of the tundish reaches the casting liquid level, and casting operation is carried out;
(7) and carrying out continuous casting and blank forming operations.
Example 2
The invention provides a method for controlling the quality of a continuous casting head blank, which comprises the following steps:
(1) 400kg of refined lime, 100kg of deoxidized and desulfurized refining slag and 70kg of mixed deoxidizer are added into the refining position by one-time electrification; raising the temperature of the molten steel, sampling, and adjusting the components until the S content of the steel grade is 0.005%;
(2) the deep vacuum degree of the vacuum position is 30Pa, and the time is 3 min; after vacuum breaking, adding a heat insulating agent to the surface of the molten steel to start soft blowing, wherein the soft blowing time is 12min longer than that of a normal pouring heat;
(3) coating the tundish, and controlling the temperature to be 200 ℃ for 1 hour;
(4) baking the tundish: baking with soft fire for 1 hour when the flame length is 300 mm; baking for 1.2 hours when the flame length is 500 mm; the flame length is 700mm and the baking time is 2 hours; baking with medium fire, wherein the flame length is 0.8 hour from the bottom of the ladle to the cover of the ladle, and the baking time is 1 hour from the bottom of the ladle to the cover of the ladle; baking with big fire, returning the flame length from the ladle bottom to the ladle cover, gradually opening an air volume valve to the maximum when the baking is dark red, wherein the air volume is based on that the flame length returns to 100mm above the ladle cover, and the baking time is 3 hours; wherein the baking temperature of the tundish in the impact area is 1200 ℃; the temperature of a casting area is 1050 ℃; baking the tundish nozzle to 1050 ℃; the tundish is baked, so that the baking temperature of the tundish is ensured, and the molten steel is not easy to be quenched and suddenly heated when contacting the molten steel;
(5) argon blowing operation, namely performing argon blowing operation on the impact area and the pouring area by using an argon blowing pipe, wherein the pressure of the argon is 1.0MPa, and the argon blowing time of each area is 2 min; protective pouring is carried out on the continuous casting position, and the molten steel is prevented from being secondarily oxidized to form inclusion mixed in the molten steel in the pouring process;
(6) the liquid level of the tundish reaches the casting liquid level, and casting operation is carried out;
(7) and carrying out continuous casting and blank forming operations.
The mixed deoxidizer comprises 30kg of aluminum particles, 20kg of silicon carbide and 20kg of carbon powder.
The sampling condition in the step (1) is to sample under the condition that the temperature of the molten steel is 30 ℃ higher than the liquidus temperature.
Naturally preserving the tundish in the step (3) for 4 hours in summer after the coating construction of the tundish is finished; and naturally preserving in winter for 6 hours.
Example 3
The invention provides a method for controlling the quality of a continuous casting head blank, which comprises the following steps:
(1) 350kg of refined lime, 80kg of deoxidized and desulfurized refining slag and 20kg of mixed deoxidizer are added into the refining site by one-time electrification; raising the temperature of the molten steel, sampling, and adjusting the components until the S content of the steel grade is 0.005%;
(2) the deep vacuum degree of the vacuum position is 20Pa, and the time is 2 min; after vacuum breaking, adding a heat insulating agent to the surface of the molten steel to start soft blowing, wherein the soft blowing time is prolonged by 11min compared with a normal pouring heat;
(3) coating the tundish, and controlling the temperature to be between 150 ℃ and the time to be 0.5 hour;
(4) baking the tundish: baking with soft fire for 0.5 hour when the flame length is 300 mm; baking for 1 hour when the flame length is 500 mm; the flame length is 700mm, and the baking time is 3 hours; baking with medium fire, wherein the flame length is 0.6 hour from the bottom of the ladle to the cover of the ladle, and the baking time is 1 hour from the bottom of the ladle to the cover of the ladle; baking with big fire, returning the flame length from the ladle bottom to the ladle cover, gradually opening an air volume valve to the maximum when the baking is dark red, wherein the air volume is based on that the flame length returns to 100mm above the ladle cover, and the baking time is 3 hours; wherein the baking temperature of the tundish in the impact area is 1300 ℃; the temperature of a casting area is 1250 ℃; baking the tundish nozzle to 1050 ℃; the tundish is baked, so that the baking temperature of the tundish is ensured, and the molten steel is not easy to be quenched and suddenly heated when contacting the molten steel;
(5) argon blowing operation, namely performing argon blowing operation on the impact area and the pouring area by using an argon blowing pipe, wherein the pressure of the argon is 1.0MPa, and the argon blowing time of each area is 1 min; protective pouring is carried out on the continuous casting position, and the molten steel is prevented from being secondarily oxidized to form inclusion mixed in the molten steel in the pouring process;
(6) the liquid level of the tundish reaches the casting liquid level, and casting operation is carried out;
(7) and carrying out continuous casting and blank forming operations.
The mixed deoxidizer comprises 40kg of aluminum particles, 20kg of silicon carbide and 20kg of carbon powder.
The sampling condition in the step (1) is to sample under the condition that the temperature of the molten steel is 30 ℃ higher than the liquidus temperature.
In the step (3), water is used for mixing coating materials in the tundish coating construction, and the water temperature is 10 ℃; 500 Kg/roller is added each time when the materials are mixed, the water addition amount is 18%, the dry materials are added into the roller and stirred for 2 minutes, then water is added, and the materials are discharged after being stirred for 15 minutes.
Opening a ladle sliding nozzle, receiving drainage sand, quickly sleeving the ladle sliding nozzle into a long nozzle, and vertically hanging the ladle sliding nozzle; introducing argon at a flow rate of 20L/min, and adding a tundish covering agent into the tundish to ensure that the molten steel does not contact air along with the increase of the tonnage of the molten steel in the tundish; and when the liquid level of the tundish reaches the casting liquid level, casting, and maintaining the normal casting speed of the casting speed to be stable to finish casting.
And (5) after the casting operation in the step (6), increasing the residence time of the molten steel in the tundish for 10 min.
The method prolongs the white slag time, can effectively adsorb impurities to float upwards, removes harmful impurities in steel, prolongs the vacuum maintenance and soft blowing time, and effectively controls the removal of harmful gases and impurities; controlling the quality of the coating material ladle wall according to the seasonal temperature to prevent the pollution of pure molten steel caused by material dropping; purging the tundish with argon before casting to expel redundant oxygen out of the tundish; the double argon seal protection pouring is used for preventing the molten steel from contacting with air to cause secondary oxidation to form oxidized inclusions.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications may be made to the above-described embodiments, and it is not necessary, nor is it intended to be exhaustive of all the embodiments. And obvious variations or modifications of the invention may be made without departing from the scope of the invention.
Claims (10)
1. A method of controlling the quality of a continuous casting head blank, the method comprising the steps of:
(1) 300-400kg of refined lime, 0-100kg of deoxidized and desulfurized refining slag and 70-80kg of mixed deoxidizer are added into the refining site by one-time electrification; raising the temperature of the molten steel, sampling, and adjusting the components until the S content of the steel grade is less than or equal to 0.005 percent;
(2) the deep vacuum degree of the vacuum position is less than or equal to 67Pa, and the time is more than or equal to 5 min; after vacuum is broken, adding a heat insulating agent to the surface of the molten steel to start soft blowing, wherein the soft blowing time is prolonged by 10-12min compared with the normal casting heat;
(3) coating the tundish, and controlling the temperature to be between 100 and 200 ℃ and the time to be less than 1.5 hours;
(4) baking the tundish: baking with soft fire for 0.5-1 hr when the flame length is 300 mm; baking for 1-1.2 hours when the flame length is 500 mm; the baking time is more than 1 hour when the flame length is 700 mm; baking with medium fire, wherein the flame length is 0.5-0.8 hour from the bottom of the ladle to the cover of the ladle, and the time from the bottom of the ladle to the cover of the ladle is more than 0.5 hour; baking with big fire, returning the flame length from the ladle bottom to the ladle cover, gradually opening the air volume valve to the maximum when the baking is dark red, wherein the air volume is based on that the flame length returns to 100mm above the ladle cover, and the baking time is longer than 2 hours; wherein the baking temperature of the tundish in the impact area is more than or equal to 1200 ℃; the temperature of a casting area is more than or equal to 1050 ℃; baking the tundish nozzle to stabilize the tundish nozzle to be more than or equal to 950 ℃;
(5) argon blowing operation, namely performing argon blowing operation on the impact area and the pouring area by using an argon blowing pipe, wherein the pressure of the argon is more than 1.0MPa, and the argon blowing time of each area is less than 3 min;
(6) the liquid level of the tundish reaches the casting liquid level, and casting operation is carried out;
(7) and carrying out continuous casting and blank forming operations.
2. The method for controlling the quality of a continuous casting head billet according to claim 1, wherein the mixed deoxidizer is composed of aluminum particles, silicon carbide and carbon powder.
3. The method for controlling the quality of a continuous casting head blank according to claim 2, wherein the sampling condition in the step (1) is to sample at a temperature of molten steel 30-40 ℃ higher than the liquidus temperature.
4. The method for controlling the quality of a continuous casting head blank according to claim 3, wherein the secondary power supply temperature rise is carried out after the composition adjustment in the step (1) if the composition content does not enter the internal control requirement, so as to ensure that the Al composition in the steel is controlled to be 0.025-0.035%.
5. The method for controlling the quality of a continuous casting head blank as claimed in claim 4, wherein the stable summer control temperature of the step (3) of applying the tundish is between 100 ℃ and 200 ℃, and the winter temperature is not less than 100 ℃.
6. The method for controlling the quality of the continuous casting head blank according to claim 5, wherein after the coating construction of the tundish in the step (3) is finished, the tundish is naturally cured for more than 4 hours in summer; naturally preserving in winter for more than 6 hours.
7. The method for controlling the quality of a continuous casting head blank according to claim 6, wherein the water for coating is mixed in the tundish coating construction in the step (3), and the water temperature is 10-40 ℃; when the materials are mixed, the adding amount of the materials is less than 550 Kg/roller each time, the adding amount of the water is 15-18%, the dry materials are added into the roller and stirred for 1-2 minutes, then the water is added, and the materials are discharged after being stirred for 10-15 minutes.
8. The method for controlling the quality of the continuous casting head blank according to the claim 7, wherein the concrete operation of the pouring of the step (6) is to open a ladle sliding nozzle, take drainage sand, quickly sleeve the ladle sliding nozzle, and vertically hang the ladle sliding nozzle right; introducing argon at a flow rate of 20-40L/min, and adding a tundish covering agent into the tundish to ensure that the molten steel does not contact air along with the increase of the tonnage of the molten steel in the tundish; and when the liquid level of the tundish reaches the casting liquid level, casting, and maintaining the normal casting speed of the casting speed to be stable to finish casting.
9. The method for controlling the quality of a continuous casting head billet according to claim 8, wherein the residence time of the molten steel in the tundish is increased by 10-30min after the casting operation in the step (6).
10. The method for controlling the quality of a continuous casting head billet according to claim 9, wherein the residence time of the molten steel in the tundish is increased by 12-20min after the casting operation in the step (6).
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|---|---|---|---|---|
| CN115255305A (en) * | 2022-08-23 | 2022-11-01 | 山东莱钢永锋钢铁有限公司 | Method for baking tundish of continuous casting machine |
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