CN111719037A - Method for increasing number of continuous casting furnaces of double-flow plate blank tundish - Google Patents
Method for increasing number of continuous casting furnaces of double-flow plate blank tundish Download PDFInfo
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- CN111719037A CN111719037A CN201910218051.4A CN201910218051A CN111719037A CN 111719037 A CN111719037 A CN 111719037A CN 201910218051 A CN201910218051 A CN 201910218051A CN 111719037 A CN111719037 A CN 111719037A
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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
- C21C7/072—Treatment 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
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/111—Treating the molten metal by using protecting powders
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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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- 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
- C21C7/076—Use of slags or fluxes as treating agents
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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
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The invention relates to the field of continuous casting, in particular to a method for increasing the number of continuous casting furnaces of a double-flow plate blank tundish, (1) a steelmaking process: the temperature before argon blowing is more than the upper limit of the leaving station temperature after argon blowing plus 25 ℃, and the argon blowing time is more than or equal to 10 minutes; after argon blowing is finished, adding 50-70 Kg of carbonized rice hulls or 100-140 Kg of covering agent; (2) a refining procedure: the refining argon blowing time of the LF furnace is more than or equal to 10 minutes; after argon blowing is finished, adding 50-70 Kg of carbonized rice hulls or 100-140 Kg of covering agent; (3) the gap between the nozzle of the tundish and the brick cup is adjusted from 5 +/-1 mm to 2.5 +/-1 mm. The invention reduces the superheat degree of the tundish, improves the casting machine pulling speed, relieves the steel seepage of the nozzle block of the tundish, ensures the casting safety, and can improve the continuous casting furnace number of the tundish of the double-flow plate blank plain carbon steel (Q235B).
Description
Technical Field
The invention relates to the field of continuous casting, in particular to a method for increasing the number of continuous casting furnaces of a double-flow plate blank tundish.
Background
The tundish is a middle container between the ladle and the crystallizer, and has the main functions of storing molten steel, reducing the static pressure of the molten steel, stabilizing the flow of the molten steel and creating conditions for multi-furnace continuous casting. The number of continuous casting furnaces of the tundish is an important index for measuring the production energy and cost control of a steel plant. On the premise of ensuring the safety of continuous casting and casting blank quality, the number of continuous casting furnaces of the tundish is increased, the consumption of the tundish can be reduced, the cost of continuous casting refractory materials is reduced, the times of changing the tundish during starting can be reduced, the loss of steel materials is reduced, the yield of molten steel is increased, the labor intensity of tundish masonry and unpacking workers is reduced, the usage amount of baking gas of the tundish is reduced, and the quality defects and production accidents of the casting blank caused by high temperature of changing the tundish during starting are reduced.
Disclosure of Invention
The invention aims to provide a method for increasing the number of continuous casting furnaces of a double-flow plate blank tundish, which reduces the superheat degree of the tundish, increases the casting machine pulling speed, relieves the steel infiltration of a tundish nozzle pocket brick, ensures the casting safety and can increase the number of continuous casting furnaces of the double-flow plate blank plain carbon steel (Q235B) of the tundish.
The technical scheme of the invention is as follows:
a method for increasing the number of continuous casting furnaces of a double-flow plate blank tundish specifically comprises the following steps:
(1) a steel making process: the temperature before argon blowing is more than the upper limit of the leaving station temperature after argon blowing plus 25 ℃, and the argon blowing time is more than or equal to 10 minutes; after argon blowing is finished, adding 50-70 Kg of carbonized rice hulls or 100-140 Kg of covering agent;
(2) a refining procedure: the refining argon blowing time of the LF furnace is more than or equal to 10 minutes; after argon blowing is finished, adding 50-70 Kg of carbonized rice hulls or 100-140 Kg of covering agent;
(3) the gap between the nozzle of the tundish and the brick cup is adjusted from 5 +/-1 mm to 2.5 +/-1 mm.
The method for increasing the number of the continuous casting furnaces of the double-flow plate blank tundish further comprises the following continuous casting process: baking the continuous casting tundish, and covering the continuous casting tundish within 1-3 minutes when the continuous casting is finished; starting up the furnace, expanding the liquid level of the tundish to 200-400 mm, and adding a covering agent and carbonized rice husks; and the continuous casting achieves the whole-process protection casting, and the full ladle casting is carried out in the casting process.
The method for increasing the number of continuous casting furnaces of the double-flow plate blank tundish further comprises a scheduling system: the molten steel of the ladle is just poured by the double-flow plate blank is more than or equal to 40t, the time from the furnace time of drawing the argon tube of the converter direct-supply casting machine to the ladle casting is less than or equal to 18 minutes, and the temperature measurement and the calm of the continuous casting station are ensured until the casting time is less than or equal to 10 minutes.
The method for increasing the number of continuous casting furnaces of the double-flow plate blank tundish comprises the following steps of mixing high-alumina bauxite and water glass to form joint mud, wherein: 8-10% of water glass and the balance of high-alumina bauxite.
The method for increasing the number of continuous casting furnaces of the double-flow plate blank tundish is characterized in that a gland is built above a nozzle, so that the joint of the nozzle and a brick cup does not directly contact with molten steel, the flow direction of the molten steel is changed through the circumferential joint of the gland, the erosion of the molten steel to the joint is slowed down, and the lower part of the brick cup is knotted by adopting a ramming mass with the thickness of 40-60 mm.
The method for increasing the number of continuous casting furnaces of the double-flow plate blank tundish is based on 230 mm-1250 mm of the plate blank section, the average superheat degree of the tundish is 27.8 ℃, the average casting speed is 1.15m/min, and the average casting period of a single ladle is 29.1 minutes.
The invention has the advantages and beneficial effects that:
the method has the advantages that the system temperature is reduced through the whole process, the superheat degree of the tundish is controlled, the casting speed of the casting machine is improved, and the number of continuous casting furnaces of the tundish is increased.
According to the invention, through a comparison test and an optimized masonry process, the steel infiltration of the nozzle pocket brick is effectively controlled, and the number of continuous casting furnaces of the tundish is increased.
The invention can adjust the matching size of the nozzle and the brick cup: through a contrast test, when the gap between the nozzle and the brick cup is adjusted to be 2 +/-1 mm, the steel infiltration length is shortest and the safety is highest.
The invention improves the material of the joint mud of the nozzle and the brick cup: the original magnesium material is modified into a high-alumina material by mixing with glass water, so that the conditions of melting, cracking and uneven filling of the joint cement at high temperature are relieved.
The invention changes the molten steel flow field at the water gap: the upper edge of the nozzle is additionally provided with the gland, so that the joint of the nozzle and the brick cup is not directly contacted with the molten steel, and the flow direction of the molten steel is changed through the circular seam of the gland, thereby slowing down the erosion of the molten steel to the joint.
Drawings
FIG. 1 is a graph showing the relationship between the fitting size of a nozzle brick and the amount of carburized steel.
FIG. 2 is a diagram showing the relationship between joint mud material and steel infiltration.
FIG. 3 is a diagram showing the relationship between the loading of the gland and the infiltration of steel.
FIG. 4 is a schematic diagram of the joint compound before adjustment.
FIG. 5 is a schematic diagram of the adjusted joint compound material.
Detailed Description
In the specific implementation process, the method for increasing the number of continuous casting furnaces of the double-flow plate blank tundish comprises the following steps:
process flow of steel plant and double-flow slab casting machine
1. The production process route of the double-flow plate blank comprises the following steps:
molten iron pretreatment → 120 ton converter → ladle bottom argon blowing station → 120 ton LF furnace refining → continuous casting double-flow slab caster tundish → slab → delivery (warehousing).
2. Main technical parameters of double-flow plate blank casting machine and tundish
The main technical parameters of the double-flow slab caster are shown in table 1, and the main technical parameters of the double-flow slab tundish are shown in table 2.
TABLE 1 Main technological parameters of double-flow slab caster
TABLE 2 Main technological parameters of the tundish for double-flow slabs
(II) technique for increasing number of double-flow plate blank continuous casting furnaces
1. Main reason for influencing continuous casting furnace number of double-flow plate blank intermediate ladle
The main reasons influencing the number of continuous casting furnaces of the double-flow plate blank tundish have two aspects, namely that the superheat degree of the tundish is higher, and the continuous casting furnace number is less due to the slow drawing speed of a casting machine. Secondly, the pouring safety is poor due to steel infiltration between the nozzle pocket bricks of the tundish nozzle.
2. Measures for reducing superheat degree of double-flow plate blank tundish
The temperature of a double-flow plate blank plain carbon steel (Q235B) system is higher, the average superheat degree of a tundish is 34.6 ℃, the continuous casting drawing speed is lower, the average drawing speed is 0.95m/min, the single-ladle pouring period is longer, the average casting time is 35.2 minutes based on 230mm x 1250mm of the plate blank section, and the number of continuous casting furnaces of the tundish is lower. In order to improve the current situation, measures for reducing the temperature of the double-flow slab system in the whole process of the steel plant are established.
A steel making process:
the method has the advantages that a temperature system must be strictly executed during steel making and tapping, the ladle condition is timely grasped, the tapping temperature is determined according to the ladle condition, and the qualified rate of the tapping temperature of the argon station is more than or equal to 85%.
The normal packing condition is as follows: the pre-argon temperature is more than the upper limit of the off-station temperature of the argon station and 25 ℃; special packing conditions: the pre-argon temperature is more than the upper limit of the off-station temperature of the argon station and 35 ℃.
The leaving temperature of the normal package condition is executed according to the middle and lower limits of the system temperature, and the argon blowing time is more than or equal to 10 minutes; the furnace time of the special ladle condition floats upwards according to the specified temperature, and the argon blowing time is more than or equal to 12 minutes. Ensuring the argon blowing time and the argon blowing effect.
After the direct-supply casting machine finishes blowing argon for the next time, 50-70 Kg of carbonized rice hulls or 100-140 Kg of covering agent is added.
A refining procedure:
the method includes the steps that an LF furnace refining must strictly execute a temperature system, the package condition is grasped in time, the outbound temperature is determined according to the package condition, and the outbound temperature qualified rate of the LF furnace is larger than or equal to 85%.
Secondly, the temperature of the normal bag leaving station is executed according to the middle and lower limits of the system temperature, and the argon blowing time is more than or equal to 10 minutes; the furnace time of the special ladle condition floats upwards according to the specified temperature, and the argon blowing time is more than or equal to 12 minutes. Ensuring the argon blowing time and the argon blowing effect.
And adding 50-70 Kg of carbonized rice hulls or 100-140 Kg of covering agent when the LF furnace is refined and leaves the station.
A ladle procedure:
the method has the advantages that after continuous casting steel casting is finished and off-line is finished, the time for casting the steel again is more than 90 minutes, baking is needed, and the steel can be cast at the baking temperature of more than or equal to 800 ℃.
The small repair package must be baked for more than 16 hours, the large repair package must be baked for more than 36 hours, and the baking temperature is guaranteed to be above 800 ℃ for use.
And the air permeability of the double plugs of the steel ladle is ensured to be more than or equal to 98 percent.
And (3) continuous casting process:
the tundish baking system is strictly executed during continuous casting tundish baking, and the baking effect is guaranteed.
And covering the ladle cover within 2 minutes after continuous casting arrives at a station, and removing the ladle cover when the crown block is in place after the casting is finished.
Thirdly, the liquid level of the tundish of the starting furnace is expanded to about 300mm, and a covering agent and carbonized rice hulls are added in time; the covering agent is coated in the middle of the starting furnace to be not less than 20 bags; rice husk is not less than 10 bags, the continuous casting furnace is timely and uniformly added with tundish covering agent, and the liquid level of molten steel cannot be exposed in the casting process.
And the continuous casting is realized through whole-course protection pouring, and full-ladle pouring is guaranteed in the pouring process.
The dispatching system:
the method has the advantages of stabilizing steel supply rhythm, avoiding equal water speed control phenomenon and ensuring that the steel liquid in the large ladle is more than or equal to 40t when the double-flow plate blank is just poured in the large ladle to the station. And ensuring that the time for drawing the argon tube to ladle casting is less than or equal to 18 minutes and the time for continuous casting to station for temperature measurement and calming to casting is less than or equal to 10 minutes.
And the superheat degree of the tundish is controlled in the steelmaking and refining operation area.
Thirdly, the baking time of the continuous casting tundish is required to be ensured by the dispatching room, and the baking time of the tundish is too short or too long due to the fact that the arrival of the tissue large ladle cannot be too early or delayed.
By reducing the implementation of measures for reducing the temperature of the double-flow slab system and strictly executing all the procedures, the superheat degree of the tundish is averagely 27.8 ℃, the average pulling speed is 1.15m/min, the casting period of the single ladle is averagely 29.1 minutes (the slab section is 230mm x 1250 mm), the continuous casting period of the tundish is 700 minutes, and the number of continuous casting furnaces can be increased by 4.2 furnaces compared with that of the tundish before the temperature of the system is reduced.
3. The main reason for the steel infiltration of nozzle brick cup
The other main reason that the number of continuous casting furnaces of the tundish is lower is that the steel is infiltrated by a nozzle and a brick cup of the tundish, and the steel infiltration of the brick cup of the nozzle is mainly caused by the following factors according to the conditions of continuously tracking the masonry, production and ladle turning of the tundish of the double-flow plate blank.
The matching size of the nozzle pocket brick is as follows:
in the original design, the fit size of the nozzle and the brick cup is clearance fit, the clearance is 5 +/-1 mm, and the designed clearance is too large. In the use process, because of the too big clearance, the seam mud coefficient of expansion can't compensate mouth of a river, brick cup thermal expansion gap, makes the seam crossing more weak, and the molten steel corrodes the infiltration steel downwards along the clearance. In addition, the gaps are too large, so that the joint mud cannot be filled, and the lower part of the joint mud does not have the joint mud and loses the protection effect.
Joint mud material
The original joint mud is made of magnesium material and is mixed with glass water, the conditions of melting and cracking exist at high temperature, the filling is uneven, and molten steel is easy to corrode and infiltrate the steel downwards along cracks or air holes.
Molten steel flow field at water gap
The original building mode only comprises the cooperation of the brick cup and the nozzle, the brick cup is directly built by coating materials, and when molten steel enters the nozzle, gaps of the nozzle brick cup are directly eroded, if the molten steel generates a swirling phenomenon, the erosion and steel infiltration are more serious.
Technological adjustment and improvement measures:
(1) adjusting the fit size of the nozzle and the brick cup
The comparative analysis of the fit sizes of different tundish nozzle pocket blocks is carried out, and the influence on the steel infiltration length is shown in figure 1. The shorter the nozzle penetration length, the less the possibility of molten steel penetrating the tundish, and the higher the safety. The contrast test shows that when the gap between the nozzle and the brick cup is adjusted to be less than or equal to 2mm, the steel infiltration length is shortest and the safety is highest.
However, if the gap is too small, the smooth installation of the brick cup cannot be ensured after the joint mud is smeared. Therefore, the gap between the nozzle and the brick cup is adjusted from 5 +/-1 mm to 2.5 +/-1 mm, thereby ensuring the smooth installation of the nozzle and the brick cup, reducing the gap between the nozzle and the brick cup and reducing the filling of joint pug. The gaps between the nozzle and the brick cup are more matched, the joint mud is full, and the penetration probability of molten steel is reduced.
(2) Improved joint mud material
The original joint mud is prepared by magnesium material and glass water, the melting and cracking conditions of the joint mud at high temperature are found through tracking, the filling is uneven, and molten steel is easy to corrode and infiltrate the steel downwards along cracks or air holes. Through continuous adjustment tests, the joint mud prepared by mixing high-alumina materials with glass water is free of melting and cracking, is uniformly expanded and filled, and can fully play a role in protection.
Comparative analysis of magnesium and high alumina joint mud is shown in figure 2 for the effect on the length of the bleed. The contrast test shows that the average length of the high-alumina joint mud is 40.7mm shorter than that of Mg joint mud in steel infiltration, and the high-alumina joint mud has good safety.
(3) Changing the flow field of molten steel at the nozzle
The original building mode only comprises the cooperation of a brick cup and a water gap, the brick cup is directly built by coating materials, and gaps of the brick cup of the water gap are directly eroded when molten steel enters the water gap. The original building mode is changed through tests, and a gland is built above the water gap. The purpose of using the nozzle gland is to prevent the joint of the nozzle and the brick cup from directly contacting molten steel, and change the flow direction of the molten steel through the annular seam of the gland, thereby slowing down the erosion of the molten steel to the joint. Through using, the gland has played and has alleviated the effect of pressing from both sides the steel. The effect on the carburized length is shown in FIG. 3 for a comparative analysis of the unheated and pressurized caps.
(4) Adding protective measures
The lower part of the original brick cup is completely filled with the coating material, and the coating material has high humidity, cracks appear after baking and poor anti-erosion capability. If molten steel penetrates through the brick cup, the molten steel can directly penetrate through the tundish through cracks quickly, and accidents are caused. The lower part of the seat brick is knotted by adopting a ramming material with the thickness of 50mm, and the high temperature resistance and the scouring resistance of the ramming material are far better than those of a coating material. After adjustment, even if molten steel passes through the brick cup, the molten steel cannot leak to the outside of the tundish, and the protective effect of safe production is achieved, as shown in fig. 4 and 5.
The results of the examples show that:
the method has the advantages that through development of scientific research projects, key points for limiting the number of continuous casting furnaces of a tundish of the double-flow plate blank common carbon steel (Q235B) are found, namely the superheat degree of the tundish is reduced, the casting speed of a casting machine is increased, steel infiltration of a nozzle block of the tundish is relieved, casting safety is guaranteed, and the number of continuous casting furnaces of the tundish of the double-flow plate blank common carbon steel (Q235B) can be increased.
Through comparative tests, 4 key continuous casting tundish masonry processes are optimized, and the aim of continuous casting of the 22-furnace tundish of the double-flow plate blank plain carbon steel (Q235B) is achieved.
And thirdly, the purpose of reducing the cost is achieved by improving the technical research project of the number of the double-flow plate blank continuous casting furnaces, and a new management idea and a new management method are provided for the cost control work.
Claims (6)
1. A method for increasing the number of continuous casting furnaces of a double-flow plate blank tundish is characterized by comprising the following steps:
(1) a steel making process: the temperature before argon blowing is more than the upper limit of the leaving station temperature after argon blowing plus 25 ℃, and the argon blowing time is more than or equal to 10 minutes; after argon blowing is finished, adding 50-70 Kg of carbonized rice hulls or 100-140 Kg of covering agent;
(2) a refining procedure: the refining argon blowing time of the LF furnace is more than or equal to 10 minutes; after argon blowing is finished, adding 50-70 Kg of carbonized rice hulls or 100-140 Kg of covering agent;
(3) the gap between the nozzle of the tundish and the brick cup is adjusted from 5 +/-1 mm to 2.5 +/-1 mm.
2. The method for increasing the number of furnaces for continuous casting of a dual-flow slab tundish according to claim 1, further comprising the step of continuous casting: baking the continuous casting tundish, and covering the continuous casting tundish within 1-3 minutes when the continuous casting is finished; starting up the furnace, expanding the liquid level of the tundish to 200-400 mm, and adding a covering agent and carbonized rice husks; and the continuous casting achieves the whole-process protection casting, and the full ladle casting is carried out in the casting process.
3. The method for increasing the number of continuous casting furnaces for dual-flow slab intermediate ladles as claimed in claim 1, further comprising a scheduling system: the molten steel of the ladle is just poured by the double-flow plate blank is more than or equal to 40t, the time from the furnace time of drawing the argon tube of the converter direct-supply casting machine to the ladle casting is less than or equal to 18 minutes, and the temperature measurement and the calm of the continuous casting station are ensured until the casting time is less than or equal to 10 minutes.
4. The method for increasing the number of continuous casting furnaces for a dual-flow slab tundish according to claim 1, wherein the high-alumina bauxite is mixed with water glass to form joint cement, wherein: 8-10% of water glass and the balance of high-alumina bauxite.
5. The method for increasing the number of continuous casting furnaces of the double-flow slab tundish according to claim 1, wherein a gland is built above the nozzle, so that the joint of the nozzle and the brick cup does not directly contact with the molten steel, the flow direction of the molten steel is changed through the circumferential joint of the gland, the corrosion of the molten steel to the joint is slowed down, and the lower part of the brick cup is knotted by ramming mass to be 40-60 mm thick.
6. The method for increasing the number of continuous casting furnaces of a double-flow slab tundish according to claim 1, characterized in that the average superheat degree of the tundish is 27.8 ℃, the average casting speed is 1.15m/min and the average casting period of a single ladle is 29.1 minutes based on 230mm by 1250mm of the slab section.
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Application publication date: 20200929 |