CN110144433B - Deoxidation slagging method of low-carbon aluminum killed steel - Google Patents
Deoxidation slagging method of low-carbon aluminum killed steel Download PDFInfo
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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
- C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
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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
- C21C7/0087—Treatment of slags covering the steel bath, e.g. for separating slag from the molten metal
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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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- 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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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
Abstract
The invention discloses a deoxidation and slagging method for low-carbon aluminum killed steel, belonging to the technical field of steel smelting. The invention comprises the following steps: the method comprises the following steps: adding a carburant to pre-deoxidize molten steel during converter tapping; step two: refining the molten steel in an LF furnace, and adding a carburant to the slag surface to deoxidize the slag; step three: adjusting the flow of argon blown from the bottom of the steel ladle; step four: after measuring the temperature, starting heating; step five: after heating is stopped, measuring the temperature and determining the oxygen, and beginning to deoxidize the molten steel and produce reducing slag; step six: adding the aluminum iron and the aluminum particles, stirring for 5 minutes, and sampling. The invention pre-deoxidizes the molten steel by the carburant in the tapping period, deeply deoxidizes and alloys the molten steel by the aluminum iron in the refining period of the LF furnace, and manufactures the reducing slag by the carburant, the aluminum particles and the refining slag, has the advantages of high slag-forming speed, low slag-forming cost, low nitrogen content of the molten steel, high cleanliness of the molten steel and the like, can improve the molten steel quality of the low-carbon aluminum killed steel, and has obvious economic benefit.
Description
Technical Field
The invention relates to the technical field of steel smelting, in particular to a deoxidation and slagging method of low-carbon aluminum killed steel.
Background
Low-carbon aluminum killed steel (C: 0.03-0.06%, Al: 0.02-0.07%, Si ≤ 0.03%) is a typical steel grade of cold-rolled sheet, and can be widely used in automobile, household appliance and building industries. At present, mainstream steel mills at home and abroad generally adopt four process paths for production: (1) "molten iron pretreatment → top and bottom combined blown converter → CAS-OB → continuous casting"; (2) "molten iron pretreatment → top and bottom combined blown converter → argon blowing station → continuous casting"; (3) "molten iron pretreatment → top and bottom combined blown converter → RH → continuous casting"; (4) "molten iron pretreatment → top and bottom combined blown converter → LF → continuous casting". When the continuous casting machine is of a CSP type, the sulfur content in molten steel is required to be less than 0.006 percent due to the characteristics of the continuous casting machine, and the molten steel needs to be fed into an LF furnace for deep desulfurization. Chinese patent 'a smelting method of low-carbon aluminum killed steel'. The disadvantage is that the RH process cannot carry out deep desulfurization and is difficult to adapt to CSP continuous casting machines. Chinese patent 'a production method of medium-low carbon aluminium killed steel' has the following defects: firstly, the oxygen in steel and the oxygen in slag are removed by utilizing the aluminum, the total generation amount of the molten steel Al2O3 is large, a large amount of calcium wires are required to be fed in the later period of the LF furnace for calcium treatment, and the cost is high.
Disclosure of Invention
1. Technical problem to be solved by the invention
Aiming at the defects and shortcomings in the prior art, the invention provides a deoxidation and slagging method of low-carbon aluminum killed steel, which pre-deoxidizes molten steel through a carburant in the tapping period, deeply deoxidizes and alloys the molten steel by adopting aluminum iron in the refining period of an LF furnace, and manufactures reducing slag through the carburant, aluminum particles and refining slag.
2. Technical scheme
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
the invention relates to a deoxidation and slagging method of low-carbon aluminum killed steel, which comprises the following steps:
the method comprises the following steps: adding a carburant to pre-deoxidize molten steel in the tapping process of the converter, and adding a slag making material to adjust a slag system;
step two: refining the molten steel in an LF furnace, adding 0.5-0.6 kg of carburant per ton of steel to the slag surface, and uniformly distributing the carburant during adding;
step three: adjusting the argon blowing flow at the bottom of the steel ladle, setting the argon blowing flow at 400-600 NL/min, and immediately setting the argon blowing flow at 200-400 NL/min after a slag layer is blown, so as to ensure that the bright surface of molten steel is 100-150 mm;
step four: after temperature measurement, heating is carried out, wherein the heating target temperature is 1620-1630 ℃, and during heating, refining slag is added in 2-4 portions for submerged arc, and the adding amount of each portion is 0.4-0.8 kg/ton of steel;
step five: after heating is stopped, measuring the temperature and determining the oxygen, and beginning to deoxidize the molten steel and produce reducing slag;
step six: adding aluminum iron and aluminum particles, stirring for 5 minutes, taking a steel sample A and a slag sample B, and observing the color of the slag;
step seven: after the analysis result of the steel sample A is obtained, adding aluminum and iron according to the content of Als to adjust the Als to a target LF station-exiting value + 0.005% ", and adding manganese alloy according to the content of Mn to adjust the content of manganese to a target value;
step eight: after adding the aluminum-iron and manganese alloys, stirring for 3 minutes, taking a steel sample C, fishing a slag sample D, and continuing the sixth step until the color of the slag is white, yellow-white or green-white;
step nine: after the color of the furnace slag is white or yellow-white or green-white, continuously stirring for 3-5 minutes, closing the furnace door during strong stirring, adjusting the opening degree of dust removal to ensure the micro-positive pressure atmosphere in the furnace, measuring the temperature after the strong stirring is finished, determining whether to heat according to the measured temperature, and adjusting the temperature to the wire feeding temperature;
step ten: feeding calcium wires;
step eleven: and after the calcium feeding line is finished, adjusting the bottom blowing flow rate to keep the bright surface of the molten steel to be less than 30mm, stirring for 6 minutes, measuring the temperature, sampling, and continuously casting on a station.
Further, the first step: adding 0.3-0.6 kg of carburant into a steel ladle before tapping, adding 0.3-0.4 kg of carburant into the steel ladle per ton aiming at a steel stream in the tapping process, adding 2-5 kg of lime into the steel ladle per ton when tapping for 30 seconds, and adding no aluminum-containing material in the tapping process.
Further, the fifth step: and adjusting the argon blowing flow at the bottom of the steel ladle for strong stirring, setting the argon blowing flow at 400-600 NL/min, enabling the bright surface of the molten steel to be 200-300 mm, closing a furnace door during the strong stirring period, adjusting the dust removal opening degree, and ensuring the micro-positive pressure atmosphere in the furnace. Adding aluminum iron to deoxidize and alloy molten steel under a strong stirring state, and adjusting the target value of the aluminum content of the molten steel to be 'an LF furnace outbound target value + 0.015%', wherein the adding amount of the aluminum iron is aluminum iron for deoxidation and aluminum iron for alloying, and is 54 multiplied by the oxygen content of the molten steel (ppm) multiplied by the molten steel amount (t) ÷ (1000 multiplied by 48 multiplied by the aluminum iron content multiplied by the aluminum yield) + the molten steel amount (t) × 1000 multiplied by (the LF furnace outbound target value + 0.015%)/(the aluminum iron content multiplied by the aluminum yield); adding aluminum particles to deoxidize the slag, wherein the adding amount of the aluminum particles is 0.5-0.6 kg per ton of steel, and the aluminum particles are uniformly distributed when being added.
Further, in the sixth step, when the slag is black, 3-4 kg/ton of steel of the refining slag is added, when the slag is brown, 2-3 kg/ton of steel of the refining slag is added, when the slag is gray or brown, 1.5-2 kg/ton of steel of the refining slag is added, when the slag is white, yellow white or green white, the reducing slag is produced, the refining slag is not added, the refining slag is stirred strongly after being added, the furnace door is closed in the period, the dedusting opening degree is adjusted, and the micro-positive pressure atmosphere in the furnace is ensured.
The specific working principle is as follows:
when the converter discharges steel, the recarburizer is added to pre-deoxidize the molten steel, the reaction formula is [ C ] + [ O ] ═ CO }, the reaction product is gaseous CO, the molten steel is not polluted, and the cleanliness of the molten steel is improved.
Molten steel enters an LF furnace, a recarburizing agent is added to the slag surface, and the ladle slag is pre-deoxidized under the combined action of electric arc and ladle bottom argon blowing energy during molten steel heating, wherein the reaction formula is [ C ]]+(FeO)＝[Fe]+ { CO }, followed by addition of aluminumThe steel ladle slag is deeply deoxidized by particles, and the reaction formula is 2[ Al]+3(FeO)＝[Al2O3]+3[Fe]。
In the LF furnace process, the molten steel is subjected to precipitation deoxidation and alloying by adding the aluminum and the iron, and the method has the advantages of high deoxidation speed and accurate control of Als content.
Deep deoxidation is not carried out in the tapping period of the converter, nitrogen absorption of deoxidized molten steel is reduced, and when the LF furnace is used for deoxidation, micro-positive pressure atmosphere in the furnace is maintained, and nitrogen absorption is reduced.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:
the invention pre-deoxidizes the molten steel by the carburant in the tapping period, deeply deoxidizes and alloys the molten steel by adopting the aluminum iron in the refining period of the LF furnace, and manufactures the reducing slag by the carburant, the aluminum particles and the refining slag, has the advantages of high slag forming speed, low slag forming cost, low nitrogen content of the molten steel, high cleanliness of the molten steel and the like, can improve the molten steel quality of the low-carbon aluminum killed steel, and has obvious economic benefit.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The invention is further described with reference to the following figures and examples:
example 1
As shown in fig. 1, the deoxidation and slagging method for the low-carbon aluminum killed steel of the embodiment includes the following steps:
the method comprises the following steps: tapping after converter blowing is finished, adding 0.3-0.6 kg of carburant into a steel ladle before tapping, adding 0.3-0.4 kg of carburant into the steel ladle in the tapping process aiming at a steel stream, adding 2-5 kg of lime into the steel ladle per ton when tapping for 30 seconds, wherein no aluminum-containing material is added in the tapping process, and the aluminum-containing material is a metallurgical material containing aluminum elements such as aluminum iron, aluminum particles, steel core aluminum, aluminum-silicon alloy and the like;
step two: refining the molten steel in an LF furnace, adding 0.5-0.6 kg of carburant per ton of steel to the slag surface, and uniformly distributing the carburant during adding;
step three: adjusting the argon blowing flow at the bottom of the steel ladle, setting the argon blowing flow at 400-600 NL/min, and immediately setting the argon blowing flow at 200-400 NL/min after a slag layer is blown, so as to ensure that the bright surface of molten steel is 100-150 mm;
step four: after temperature measurement, heating is carried out, wherein the heating target temperature is 1620-1630 ℃, and during heating, refining slag is added in 2-4 portions for submerged arc, and the adding amount of each portion is 0.4-0.8 kg/ton of steel;
step five: after the heating is stopped, the temperature is measured, the oxygen is determined, and the deoxidation of the molten steel and the production of reducing slag are started. And adjusting the argon blowing flow at the bottom of the steel ladle for strong stirring, setting the argon blowing flow at 400-600 NL/min, enabling the bright surface of the molten steel to be 200-300 mm, closing a furnace door during the strong stirring period, adjusting the dust removal opening degree, and ensuring the micro-positive pressure atmosphere in the furnace. Adding aluminum iron to deoxidize and alloy molten steel under a strong stirring state, and adjusting the target value of the aluminum content of the molten steel to be 'an LF furnace outbound target value + 0.015%', wherein the adding amount of the aluminum iron is aluminum iron for deoxidation and aluminum iron for alloying, and is 54 multiplied by the oxygen content of the molten steel (ppm) multiplied by the molten steel amount (t) ÷ (1000 multiplied by 48 multiplied by the aluminum iron content multiplied by the aluminum yield) + the molten steel amount (t) × 1000 multiplied by (the LF furnace outbound target value + 0.015%)/(the aluminum iron content multiplied by the aluminum yield); adding aluminum particles to deoxidize the slag, wherein the adding amount of the aluminum particles is 0.5-0.6 kg per ton of steel, and the aluminum particles are uniformly distributed when being added.
Step six: adding aluminum iron and aluminum particles, stirring strongly for 5 minutes, taking a steel sample A and a slag sample B, observing the color of slag, adding 3-4 kg/ton of steel of refining slag when the slag is black, adding 2-3 kg/ton of steel of refining slag when the slag is brown, adding 1.5-2 kg/ton of steel of refining slag when the slag is gray or brown, when the color of the slag is white, yellow white or green white, reducing slag is manufactured, no refining slag is added, stirring strongly after adding the refining slag, closing a furnace door during the period, adjusting the degree of dust removal opening, and ensuring the micro-positive pressure atmosphere in the furnace;
step seven: after the analysis result of the steel sample A is obtained, adding aluminum and iron according to the content of Als to adjust the Als to a target LF station-exiting value + 0.005% ", and adding manganese alloy according to the content of Mn to adjust the content of manganese to a target value;
step eight: after adding the aluminum-iron and manganese alloys, stirring for 3 minutes, taking a steel sample C, fishing a slag sample D, and continuing the sixth step until the color of the slag is white, yellow-white or green-white;
step nine: after the color of the furnace slag is white, yellow-white or green-white, continuously and forcibly stirring for 3-5 minutes, closing the furnace door during the period of the forcible stirring, adjusting the opening degree of dust removal to ensure the micro-positive pressure atmosphere in the furnace, measuring the temperature after the forcible stirring is finished, determining whether to heat according to the measured temperature, and adjusting the temperature to the wire feeding temperature;
step ten: feeding calcium wires;
step eleven: and after the calcium feeding line is finished, adjusting the bottom blowing flow rate to keep the bright surface of the molten steel to be less than 30mm, stirring for 6 minutes, measuring the temperature, sampling, and continuously casting on a station.
The low-carbon aluminum killed steel has the following chemical component requirements: c: 0.03-0.06%, less than or equal to 0.03% of Si, 0.08-0.35% of Mn, less than or equal to 0.030% of P, less than or equal to 0.008% of S, 0.030-0.050% of Als, less than or equal to 0.0050% of N, and the carburant comprises the following chemical components: c is more than or equal to 92 percent, S: less than or equal to 0.005 percent, less than or equal to 5 percent of volatile component and ash content, and 5-10 mm of granularity.
The aluminum-iron chemical composition is 40-50% of Al, more than or equal to 45% of Fe, less than or equal to 0.030% of S, and 30-50 mm in bulk.
The aluminium grain is the cylinder, diameter 8 ~ 10mm, length: 10-15 mm, and the chemical component Al is more than or equal to 99 percent.
The yield of aluminum is 70-80%.
The refining slag is a premelted sphere and comprises the chemical components of more than or equal to 10 percent of Al, 30-50 percent of CaO and SiO2≤5.0％，H2O is less than or equal to 1.0 percent, and the diameter is 10-20 mm.
Adding the aluminum iron and the refining slag, weighing by an electronic scale, and adding the aluminum iron and the refining slag into a steel ladle from a high-level bin of an LF furnace through a belt.
The recarburizing agent and the aluminum particles are added into a steel ladle through a furnace door manually.
In the method, the operations of adjusting the manganese content, heating, feeding calcium wire and the like are commonly adopted in a steel mill for smelting the low-carbon aluminum killed steel LF furnace, and the method is not described in detail in the application.
The invention pre-deoxidizes the molten steel by the carburant in the tapping period, deeply deoxidizes and alloys the molten steel by adopting the aluminum iron in the refining period of the LF furnace, and manufactures the reducing slag by the carburant, the aluminum particles and the refining slag, has the advantages of high slag forming speed, low slag forming cost, low nitrogen content of the molten steel, high cleanliness of the molten steel and the like, can improve the molten steel quality of the low-carbon aluminum killed steel, and has obvious economic benefit.
Example 2
In the deoxidation slagging method of the low-carbon aluminum killed steel, after converter blowing is finished, 60kg of carburant is added into a ladle before steel tapping, 36kg of carburant is added into the ladle in alignment with steel flow in the steel tapping process, and 500kg of lime is added into the ladle when the steel tapping is carried out for 30 seconds; no aluminum-containing material is added in the tapping process;
after molten steel enters an LF procedure, 60kg of carburant is added to the slag surface, and the slag surface is uniformly distributed during adding;
adjusting the flow rate of argon blowing at the bottom of the steel ladle, setting the flow rate of argon blowing at 500 NL/min, immediately setting the flow rate of argon blowing at 300NL/min after blowing a slag layer, and setting the bright surface of molten steel to be about 120 mm;
measuring the temperature of molten steel, wherein the temperature of the molten steel is 1565 ℃, heating for 18 minutes, adding refining slag in 4 batches for submerged arc during the heating, adding 50kg, 30kg and 60kg in four batches respectively, measuring the temperature and determining oxygen after the heating is finished, wherein the temperature of the molten steel is 1628 ℃, the oxygen content of the molten steel is 425ppm, beginning to deoxidize the molten steel and produce reducing slag, adjusting the flow of argon blown at the bottom of a ladle to be 500 NL/minute, the bright surface of the molten steel to be about 280mm, and then adding aluminum iron to deoxidize and alloy the molten steel, wherein the target value of the aluminum content of the molten steel is adjusted to be 0.060 percent, the adding amount of the aluminum iron is 383kg (calculated according to an aluminum iron adding amount formula), adding 60kg of aluminum particles to deoxidize the slag, uniformly distributing on the slag surface during the adding, closing a furnace door at other times except for adding the aluminum particles, adjusting the dedusting opening.
After adding aluminum iron and aluminum particles, setting argon blowing flow at 500 NL/min, enabling the bright surface of molten steel to be about 300mm, carrying out strong stirring on the molten steel, taking a steel sample and a slag sample after 5 minutes, observing that the color of slag is black, adding 350kg of refining slag, closing a furnace door during strong stirring, adjusting the degree of dust removal opening, and ensuring the micro-positive pressure atmosphere in the furnace;
after the content of Als in the steel sample is 0.044%, adding 35kg of aluminum and iron to adjust Als, adjusting the aluminum content of molten steel to 0.049%, and adding manganese alloy to adjust the manganese content to a target value;
after aluminum iron and manganese alloy are added, strong stirring is carried out for 3 minutes, then a steel sample is taken, a slag sample is fished, the color of the slag is observed to be gray, 180kg of refining slag is added, strong stirring is carried out after the addition, the furnace door is closed during the period, the opening degree of dust removal is adjusted, the micro-positive pressure atmosphere in the furnace is ensured, after strong stirring is carried out for 5 minutes, the slag sample is fished, the color of the slag is observed to be yellow-white, and then strong stirring is carried out for 5 minutes. During the strong stirring period, the furnace door is closed, and the micro-positive pressure atmosphere in the furnace is ensured. After the strong stirring is finished, measuring the temperature of 1575 ℃ and the temperature of not reaching the wire feeding temperature (1585 ℃), heating for 3min, and measuring the temperature of the molten steel at 1586 ℃ and the wire feeding temperature;
starting to feed calcium wires;
and after the calcium feeding line is finished, adjusting the bottom blowing flow rate to keep the bright surface of the molten steel at 20mm, stirring for 6 minutes, measuring the temperature, sampling, and continuously casting and casting on a station.
Table 1 example 2 LF outbound chemistry
Example 3
In the deoxidation slagging method of the low-carbon aluminum killed steel, after converter blowing is finished, tapping is carried out, 50kg of carburant is added into a ladle before tapping, 45kg of carburant is added into the ladle in alignment with steel flow in the tapping process, and 360kg of lime is added into the ladle when tapping is carried out for 30 seconds; no aluminum-containing material is added in the tapping process;
after molten steel enters an LF procedure, 70kg of carburant is added to the slag surface, and the slag surface is uniformly distributed during adding;
adjusting the flow rate of argon blowing at the bottom of the steel ladle, wherein the flow rate of argon blowing is set to be 550 NL/min, and after a slag layer is blown open, the flow rate of argon blowing is immediately set to be 330 NL/min, and the bright surface of molten steel is about 140 mm;
measuring the temperature of molten steel, namely measuring the temperature of the molten steel at 1555 ℃, heating for 20 minutes, adding refining slag into the molten steel for submerged arc in 4 batches during the heating period, wherein the four batches are respectively 60kg, 75kg, 60kg and 50kg, measuring the temperature and determining the oxygen after the heating is finished, measuring the temperature and determining the oxygen at 1625 ℃, the oxygen content of the molten steel is 385ppm, beginning to deoxidize the molten steel and produce reducing slag, adjusting the flow of argon blowing at the bottom of a steel ladle to be 540 NL/minute, and the bright surface of the molten steel to be about 300mm, and then adding aluminum iron to deoxidize and alloy the molten steel, wherein the target value of the aluminum content of the molten steel is adjusted to be 0.060 percent, and the adding amount of the; adding 70kg of aluminum particles to deoxidize the slag, uniformly distributing the aluminum particles on the slag surface during the adding, closing the furnace door at other times except the adding operation of the aluminum particles, adjusting the opening degree of dust removal, and ensuring the micro-positive pressure atmosphere in the furnace;
after adding aluminum iron and aluminum particles, setting argon blowing flow at 540 NL/min, enabling the bright surface of molten steel to be about 300mm, carrying out strong stirring on the molten steel, taking a steel sample I and a slag sample I after 5min, observing that the color of slag is tan, adding 360kg of refining slag, carrying out strong stirring, closing a furnace door during the period, adjusting the degree of dust removal opening, and ensuring the micro-positive pressure atmosphere in the furnace;
after the content of Als in the steel sample is 0.037%, adding 43kg of aluminum and iron to adjust the content of Als, adjusting the aluminum content of the molten steel to 0.049% in the step, and adding manganese alloy to adjust the manganese content to a target value;
after aluminum iron and manganese alloy are added, strong stirring is carried out for 3 minutes, then a steel sample is taken, a slag sample is fished, the color of the slag is observed to be yellow-white, then strong stirring is carried out for 5 minutes, during the strong stirring period, a furnace door is closed, the micro-positive pressure atmosphere in the furnace is ensured, the temperature is measured to be 1572 ℃ after the strong stirring is finished, the temperature does not reach the wire feeding temperature (1585 ℃), the temperature is measured after heating is carried out for 4 minutes, and the temperature of molten steel reaches 1587 ℃ and reaches the wire feeding temperature;
starting to feed calcium wires;
and after the calcium feeding line is finished, adjusting the bottom blowing flow rate to keep the bright surface of the molten steel at 25mm, stirring for 6 minutes, measuring the temperature, sampling, and continuously casting and casting on a station.
Table 2 example 3 LF outbound chemistry
The present invention and its embodiments have been described above schematically, without limitation, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching, without departing from the spirit of the invention, the person skilled in the art shall not inventively design the similar structural modes and embodiments to the technical solution, but shall fall within the scope of the invention.
Claims (2)
1. A deoxidation slagging method of low-carbon aluminum killed steel is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps: adding a carburant to pre-deoxidize molten steel during converter tapping, and adding a slag making material to adjust a slag system;
step two: refining the molten steel in an LF furnace, and adding 0.5-0.6 kg of carburant per ton of steel to the slag surface, wherein the carburant is required to be uniformly distributed;
step three: adjusting the argon blowing flow at the bottom of the steel ladle, setting the argon blowing flow at 400-600 NL/min, and immediately setting the argon blowing flow at 200-400 NL/min after a slag layer is blown, so as to ensure that the bright surface of molten steel is 100-150 mm;
step four: after temperature measurement, heating is carried out, wherein the heating target temperature is 1620-1630 ℃, and during the heating period, refining slag is added for submerged arc for 2-4 times, and the adding amount of each batch is 0.4-0.8 kg/ton of steel;
step five: after heating is stopped, measuring temperature and determining oxygen, beginning to deoxidize molten steel and produce reducing slag, adjusting argon blowing flow at the bottom of a steel ladle to carry out strong stirring, wherein the argon blowing flow is set to be 400-600 NL/min, so that the bright surface of the molten steel is 200-300 mm, during the strong stirring, closing a furnace door, adjusting the degree of a dust removal opening, ensuring a micro-positive pressure atmosphere in the furnace, and adding aluminum iron to deoxidize and alloy the molten steel under the strong stirring state, wherein the target value of the aluminum content of the molten steel is 'an LF furnace exit target value + 0.015%', and the adding amount of the aluminum iron is 54 multiplied by the oxygen content of the molten steel (ppm) multiplied by the quantity of the molten steel (t) ÷ (1000 multiplied by 48 multiplied by the aluminum iron aluminum content multiplied by the aluminum yield) + the quantity of the molten steel (t) × multiplied by 1000 multiplied by (LF furnace exit target value + 0.015%)/(the aluminum content multiplied by the molten iron content; adding aluminum particles to deoxidize the slag, wherein the adding amount of the aluminum particles is 0.5-0.6 kg per ton of steel, and the aluminum particles are uniformly distributed during adding;
step six: adding aluminum iron and aluminum particles, stirring strongly for 5 minutes, taking a steel sample A and a slag sample B, observing the color of slag, adding 3-4 kg/ton of steel of refining slag when the slag is black, adding 2-3 kg/ton of steel of refining slag when the slag is brown, adding 1.5-2 kg/ton of steel of refining slag when the slag is gray or brown, making reducing slag when the slag is white, yellow white or green white, not adding the refining slag, stirring strongly after adding the refining slag, closing a furnace door during the period, adjusting the dedusting opening degree, and ensuring the micro-positive pressure atmosphere in the furnace;
step seven: after the analysis result of the steel sample A is obtained, adding aluminum and iron according to the content of Als to adjust the Als to a target LF station-exiting value + 0.005% ", and adding manganese alloy according to the content of Mn to adjust the content of manganese to a target value;
step eight: after adding the aluminum-iron and manganese alloys, forcibly stirring for 3 minutes, taking a steel sample C, fishing a slag sample D, observing the color of the slag, adding refining slag, and forcibly stirring until the color of the slag is white, yellow-white or green-white;
step nine: after the color of the furnace slag is white or yellow-white or green-white, continuously stirring for 3-5 minutes, closing the furnace door during strong stirring, adjusting the opening degree of dust removal to ensure the micro-positive pressure atmosphere in the furnace, measuring the temperature after the strong stirring is finished, determining whether to heat according to the measured temperature, and adjusting the temperature to the wire feeding temperature;
step ten: feeding calcium wires;
step eleven: and after the calcium feeding line is finished, adjusting the bottom blowing flow rate to keep the bright surface of the molten steel to be less than 30mm, stirring for 6 minutes, measuring the temperature, sampling, and continuously casting on a station.
2. The deoxidation and slagging method for low-carbon aluminum killed steel as claimed in claim 1, characterized in that: the first step is as follows: adding 0.3-0.6 kg of carburant into a steel ladle before tapping, adding 0.3-0.4 kg of carburant into the steel ladle per ton aiming at a steel stream in the tapping process, adding 2-5 kg of lime into the steel ladle per ton when tapping for 30 seconds, and adding no aluminum-containing material in the tapping process.
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| CN110484683B (en) * | 2019-09-04 | 2021-05-28 | 鞍钢股份有限公司 | LF refining carbon adjusting method for carbon steel |
| CN113355483A (en) * | 2020-03-05 | 2021-09-07 | 马鞍山钢铁股份有限公司 | Deoxidation slagging technology for LF (ladle furnace) |
| CN112322837B (en) * | 2020-11-05 | 2022-02-01 | 马鞍山钢铁股份有限公司 | Smelting process for efficient slagging and desulfurization of LF (ladle furnace) aluminum killed steel |
| CN113584257B (en) * | 2021-08-03 | 2022-12-02 | 攀钢集团西昌钢钒有限公司 | Method for efficient and economic sedation and aluminum alloying of aluminum killed steel |
| CN114908214B (en) * | 2022-06-28 | 2024-03-12 | 湖南华菱涟源钢铁有限公司 | Control method for linear defects of hot rolled edge of low-carbon aluminum killed steel |
| CN115725817B (en) * | 2022-11-21 | 2024-03-08 | 马鞍山钢铁股份有限公司 | Rapid desulfurization method for low-carbon low-silicon aluminum killed steel |
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