Method for safely producing 4343 alloy blank with low carbon and low cost

Abstract

The invention belongs to the technical field of aluminum alloy production, and particularly discloses a low-carbon, low-cost and safe method for producing a 4343 alloy blank, raw materials are weighed according to a certain proportion, an aluminum melt obtained through smelting in a smelting furnace is refined and subjected to on-line degassing and filtering, the 4343 alloy blank is produced through a continuous casting and rolling method, a finished product is small in crack edge, segregation of internal components of the material is small, and the production cost is low. The method has the advantages that secondary aluminum can be used as raw materials in a large proportion, low carbon and consumption reduction are achieved, and the method is different from a traditional casting production mode, a matched casting deep well is not needed, the phenomenon that cooling water is accumulated in the deep well or a narrow area is avoided, and the explosion problem possibly occurring after high-temperature aluminum water makes contact with the cooling water is avoided; the production process is simple, the safety degree is high, aluminum-strontium alloy is not needed in the production process, the production cost is reduced, and meanwhile the strontium poisoning phenomenon caused by misoperation of field operators is completely eradicated.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of aluminum alloy production, and specifically discloses a method for producing 4343 alloy blank with low carbon, low cost and safe production. BACKGROUND

[0002] The automobile radiator functions to forcibly cool the core components such as the battery and motor of the new energy automobile, and transfer the excess heat generated during operation to the air to ensure that the core components always operate in a safe temperature range. The automobile radiator includes a radiator frame, a radiator pipe and a radiator core body produced by using aluminum alloy materials, wherein the radiator pipe and the radiator core body are welded by high-temperature brazing, and the radiator core body is a composite material, and the surface layer 4 system alloy has a high-temperature brazing function.

[0003] The 4 system aluminum alloy required for high-temperature brazing is commonly 4045 and 4343 alloy, which has a very high silicon content and is difficult to produce. The conventional method is to produce a blank by using hot rolling, which includes the following processes: melting, flat ingot casting, sawing and milling, homogenization treatment, hot rolling to 7mm thick coil, annealing, cold rolling to blank, etc. This production method has the problems of long process flow, high repeated rolling cost, large edge cracking in multi-pass rolling process, low comprehensive product yield, high production energy consumption and high production cost. In recent years, some enterprises have tried to produce by using cast-rolling low-cost method. For example, Chinese patents CN103008345B, CN104178667B and CN103215480B use cast-rolling method to produce 4343 alloy. However, the existing methods for producing 4343 alloy by using cast-rolling method all need to use aluminum strontium alloy, which has a high price and high cost, and may threaten the health of the operators if not used properly. SUMMARY

[0004] In order to solve the problems in the background art, the application discloses a method for producing 4343 alloy blank with low carbon, low cost and safe production, which produces 4343 alloy blank by continuous casting and rolling method, does not need to use aluminum strontium alloy, realizes low carbon, low cost, high efficiency and short process production, and eliminates the occupational health hazards caused by aluminum strontium alloy.

[0005] In order to achieve the above-mentioned application purposes, the application adopts the following technical solutions: A method for producing 4343 alloy blank with low carbon, low cost and safe production includes the following steps: S1, batching and smelting: put 25-35% of electrolytic aluminum liquid and 65-75% of recycled aluminum scrap into a smelting furnace to prepare an aluminum melt, and then add fast-dissolving silicon, iron agent, copper agent, manganese agent, titanium agent into the smelting furnace in sequence, and adjust the alloy components to be qualified, wherein the mass percentage of each component is: Si: 7.6-8.1%, Fe: 0.3-0.4%, Cu≤0.1%, Mn≤0.1%, Ti: 0.045-0.055%, other single impurities≤0.03%, total≤0.15%, and the balance is Al; S2, melt purification treatment: under electromagnetic stirring, the aluminum melt with qualified ingredients in the smelting furnace is refined by a refiner, the hydrogen content in the refined aluminum melt is less than 0.15 mg / 100 g Al, the refining gas of the refiner is argon, the argon pressure is 0.5±0.1 MPa, and the refined aluminum melt is subjected to slagging, and after slagging, the aluminum melt is placed for more than 30 min before being taken out of the furnace, and the temperature of the aluminum melt at the outlet of the smelting furnace is 705-715℃. S3, grain refiner addition: after the furnace is started, the aluminum melt flows smoothly into the flow guide chute, and the aluminum titanium boron wire is uniformly added into the aluminum melt at a constant speed; S4, on-line degassing and filtration: the aluminum melt with added grain refiner flows into a degassing tank, argon is introduced into the degassing tank for on-line degassing, the temperature of the aluminum liquid at the outlet of the degassing tank is 695-705℃, the degassed aluminum melt enters a plate filter tank for filtration, the temperature of the aluminum liquid at the outlet of the plate filter tank is 685-695℃, and the degassed and filtered aluminum melt directly flows into a forehearth; S5, continuous casting: the temperature of the forehearth is 670-680℃, the aluminum melt in the forehearth flows into the casting cavity of the casting machine through the casting nozzle, the aluminum melt solidifies in the casting cavity to form a cast slab, and the stably supplied aluminum melt is discharged out of the plate along with the same direction rotation of the upper and lower steel belts, the outlet temperature of the cast slab is 500-560℃, the casting speed is 6.7-7.2 m / min, and the thickness of the cast slab is 19 mm; S6, three-stand rolling: the cast slab passes through a looper table and enters a three-stand rolling mill for rolling, the thickness of the plate slab at the outlet of the first stand of the three-stand rolling mill is 9.0-10.0 mm, the thickness of the plate slab at the outlet of the second stand of the three-stand rolling mill is 5.0-6.0 mm, the thickness of the plate slab at the outlet of the third stand of the three-stand rolling mill is 3.0-4.0 mm, and the material at the outlet of the third stand of the three-stand rolling mill is directly coiled to obtain a 4343 alloy billet.

[0006] Further, in step S2 of the method for producing the low-carbon, low-cost and safe 4343 alloy billet, after the melt is refined, slagged and placed, samples are taken from both sides of the furnace door of the smelting furnace for component detection, and the deviation of each alloy content is 0.01% or less.

[0007] Further, in the method for producing the low-carbon, low-cost and safe 4343 alloy blank, the speed of the rotor of the refiner in step S2 is 450-550 rpm, the rotor enters the aluminum melt at an angle of 45° from the refining window, and the height of the aluminum melt surface is at least 30 cm higher than the height of the surface when the rotor is completely submerged.

[0008] Further, in the method for producing the low-carbon, low-cost and safe 4343 alloy blank, the melt refining time in step S2 is more than 50 min to ensure the melt refining effect and achieve local uniform stirring and avoid composition segregation.

[0009] Further, in the method for producing the low-carbon, low-cost and safe 4343 alloy blank, the aluminum-titanium-boron wire is added at a uniform speed of 2.5±1 m / min in step S3.

[0010] Further, in the method for producing the low-carbon, low-cost and safe 4343 alloy blank, eight groups of aluminum-titanium-boron wires are added to the melt at a uniform speed in step S3, two groups of aluminum-titanium-boron wires are added to the Y-type flow port, four groups of aluminum-titanium-boron wires are added after the degassing tank, two groups of aluminum-titanium-boron wires are added after the plate filter tank, the distance between each group of aluminum-titanium-boron wires is more than 0.5 m, and a titanium wire stirring device is arranged at each aluminum-titanium-boron wire adding position, and the speed of the titanium wire stirring device is 60±2 rpm to ensure that the titanium wire does not deposit.

[0011] Further, in the method for producing the low-carbon, low-cost and safe 4343 alloy blank, the argon pressure in the degassing tank in step S4 is 0.5±0.05 MPa, the rotor speed is 500±10 rpm, the gas temperature in the degassing tank is 930-970°C, two ceramic filter plates with a size of 30+40 ppi are arranged in the plate filter tank, and the temperature in the plate filter tank is 910-950°C.

[0012] Further, in the method for producing the low-carbon, low-cost and safe 4343 alloy blank, the steel belt jump during continuous casting in step S5 does not exceed 0.01±0.005 mm, and helium gas is used for cooling during continuous casting of the 4343 alloy.

[0013] Further, in the method for producing the low-carbon, low-cost and safe 4343 alloy blank, the emulsion mass percentage concentration is 3.5±0.1% and the emulsion temperature is 48±3°C during continuous rolling in step S6.

[0014] Further, in the step S6 of the method for producing the low-carbon, low-cost and safe 4343 alloy blank, the emulsion spraying amount of the first stand of the three-stand tandem mill is 3300 L / min to 4700 L / min, the emulsion spraying amount of the second stand of the three-stand tandem mill is 2900 L / min to 4100 L / min, and the emulsion spraying amount of the third stand of the three-stand tandem mill is 2500 L / min to 3500 L / min, and the aluminum coil after the tandem rolling has no quality defects such as press marks, edge cracks and holes.

[0015] Due to the above technical solutions, the present application has the following advantages: 1. The method for producing the low-carbon, low-cost and safe 4343 alloy blank produces the 4343 alloy blank by the continuous casting and rolling method, which is different from the traditional melting and casting production method. The method does not need to be matched with a deep well, and the phenomenon of the accumulation of cooling water in the deep well or narrow area does not occur. The explosion problem that may occur after the high-temperature aluminum water contacts the cooling water is avoided, the safety degree is high, and the production process does not need to use aluminum strontium alloy, which reduces the production cost, and at the same time, the phenomenon of strontium poisoning of the on-site operator due to misoperation is eliminated. 2. The finished product manufactured by the method for producing the low-carbon, low-cost and safe 4343 alloy blank has small edge cracks and less internal component segregation, which is convenient for subsequent processing and use, and the raw material can use recycled aluminum in a large proportion to achieve the goal of low-carbon and consumption reduction. DETAILED DESCRIPTION

[0016] The present application is further explained and described in conjunction with the embodiments below, which cannot limit the protection scope of the present application, and the purpose of disclosing the present application is to protect all technical improvements within the scope of the present application. Embodiment 1

[0017] A method for producing a low-carbon, low-cost and safe 4343 alloy blank, the specific steps are: S1, melting and batching: placing electrolytic aluminum liquid with a mass percentage of 25.6% and recycled aluminum waste with a mass percentage of 74.4% into a melting furnace to prepare an aluminum melt, and sequentially adding fast-acting silicon, iron agent, copper agent, manganese agent, titanium agent into the melting furnace to adjust the alloy components to be qualified, wherein the mass percentage of each component is: Si: 7.71%, Fe: 0.32%, Cu: 0.05%, Mn: 0.07%, Ti: 0.047%, other single impurities ≤0.03%, total ≤0.15%, and the balance is Al. S2, melt purification treatment: the qualified aluminum melt is refined by using HD2000 refiner, argon is used as refining gas, the argon pressure is 0.48 MPa, the rotating speed of the rotor of HD2000 refiner is 498 r / min, the rotor is 45° from the refining window into the aluminum liquid, the liquid level of the aluminum melt is higher than the liquid level of the completely submerged graphite rotor by more than 30 cm, the electromagnetic stirring is required to be opened during the refining, the melt refining time is more than 50 min, so as to ensure the refining effect of the melt and play a role in local stirring uniformity, avoid composition segregation, the hydrogen content in the aluminum melt after refining is less than 0.15 mg / 100 g Al; After refining, the slagging operation is performed by using the slagging car, the surface of the aluminum melt after slagging is mirror-like, there is no floating slag with an area of more than 50 mm x 50 mm, after the melt is refined, slagged and static, the composition is detected by sampling at the left and right sides of the furnace door, the deviation of the content of each alloy is less than 0.01%, the melt is static for more than 30 min after slagging, the melting furnace is started, and the temperature of the aluminum melt at the outlet of the melting furnace is 708℃; S3, grain refiner addition: after starting, the aluminum melt flows into the flow tank stably, eight groups of aluminum titanium boron wires are added into the melt at an adding speed of 2.5±1 m / min, two groups of aluminum titanium boron wires are added at the Y type flow port, four groups of aluminum titanium boron wires are added after the degassing box, two groups of aluminum titanium boron wires are added after the plate filter box, the adding distance of each group of aluminum titanium boron wires is more than 0.5 meters, the aluminum titanium boron wire adding position is provided with a titanium wire stirring device, the speed of the titanium wire stirring device is 60±2 r / min, so as to ensure that the titanium wire will not deposit; S4, on-line degassing and filtration: the aluminum melt flows into the degassing box, argon is introduced into the degassing box for on-line refining, the argon pressure is 0.48 MPa, the rotating speed of the three rotors is set to 501 r / min, the gas temperature in the degassing box is set to 942℃, the temperature of the aluminum liquid at the outlet of the degassing box is 699℃, the plate filter box is provided with two ceramic filter plates with a size of 30+40 ppi, the temperature of the plate filter box is set to 918℃, so as to ensure that the temperature of the aluminum liquid at the outlet of the plate filter box is 689℃, the aluminum melt after degassing and filtration directly flows into the front box; S5, continuous casting: the melt flows into the front box through the vertical flow stabilizer, the temperature of the front box is 672℃, the nozzle is connected with the front box, the melt in the front box flows into the casting cavity of the casting machine through the nozzle, the inside of the steel belt circulates cooling water to cool the melt through the cooling steel belt, the melt solidifies in the casting cavity to form a casting blank, the aluminum melt is continuously cast into a plate with the same direction rotation of the upper and lower steel belts, the casting speed is controlled at 6.9 m / min, the thickness of the casting blank is 19 mm, when the 4343 alloy is continuously cast, the helium gas should be closed and not be used, the outlet temperature of the casting plate is controlled in the range of 500-560℃; S6, three-stand rolling: the cast blank enters the three-stand rolling mill through the looper table, the emulsion temperature of the first stand of the three-stand rolling mill is controlled at 46℃, the spraying amount is controlled at 4600L / min, the slab outlet thickness is 9.5mm, the emulsion temperature of the second stand of the three-stand rolling mill is controlled at 46℃, the spraying amount is controlled at 3800L / min, the slab outlet thickness is 5.2mm; the emulsion temperature of the third stand of the three-stand rolling mill is controlled at 46℃, the spraying amount is controlled at 3400L / min, the slab outlet thickness is 3.2mm, the material at the outlet of the third stand of the three-stand rolling mill is directly coiled to obtain the 4343 alloy blank, and the surface of the aluminum coil coiled after the three-stand rolling shall not have quality defects such as pressing marks, edge cracks, holes and the like. Example 2

[0018] A method for producing a 4343 alloy blank with low carbon and low cost and safe production, the specific steps are: S1, smelting and batching: placing electrolytic aluminum liquid with a mass percentage of 34.5% and recycled aluminum scrap with a mass percentage of 65.5% into a smelting furnace to prepare an aluminum melt, and sequentially adding fast-acting silicon, iron agent, copper agent, manganese agent, titanium agent into the smelting furnace, and adjusting the alloy components to be qualified, wherein the mass percentage of each component is: Si: 8.08%, Fe: 0.39%, Cu: 0.09%, Mn: 0.07%, Ti: 0.054%, other single impurities ≤0.03%, total ≤0.15%, and the balance is Al; S2, melt purification treatment: the aluminum melt with qualified batching is refined using an HD2000 refiner, argon gas is used as the refining gas, the argon gas pressure is ensured to be 0.58MPa, the rotor speed of the HD2000 refiner is kept at 520r / min, the rotor is at an angle of 45° and enters the aluminum liquid from the refining window, it is required to ensure that the aluminum melt completely submerges the graphite rotor by more than 30cm, the electromagnetic stirring is required to be turned on during the refining, the melt refining time is more than 50min to ensure the refining effect of the melt and to achieve local stirring uniformity to avoid composition segregation, the hydrogen content in the aluminum melt after refining is less than 0.15mg / 100gAl, the refined melt is subjected to slag removal operation using a slag removal car, the surface of the aluminum melt after slag removal is mirror-like, and there shall be no floating slag with an area of more than 50mm×50mm, after the melt is subjected to refining, slag removal and standing, samples are taken from both sides of the furnace door of the smelting furnace for component detection, the deviation of each alloy content is 0.01% or less, the smelting furnace is started after standing for more than 30min after slag removal, and the temperature of the aluminum melt at the outlet of the smelting furnace is 713℃; S3. Adding grain refiner: After starting the furnace, the aluminum melt flows smoothly into the diversion trough. Eight groups of aluminum titanium boron wires are uniformly added to the melt at a rate of 2.5±1m / min. Two groups of aluminum titanium boron wires are added at the Y-type flow port, four groups of aluminum titanium boron wires are added after the degassing box, and two groups of aluminum titanium boron wires are added after the plate filter box. The addition distance of each group of aluminum titanium boron wires is more than 0.5 meters. A titanium wire stirring device must be installed at the aluminum titanium boron wire addition position. The speed of the titanium wire stirring device is 60±2 rpm to ensure that the titanium wire does not deposit. S4. Online degassing and filtration: The aluminum melt flows into the degassing box, and argon gas is introduced into the degassing box for online refining. The argon pressure is 0.52MPa, the speed of the three rotors is set to 508 rpm, the gas temperature in the degassing box is set to 965℃, and the aluminum liquid temperature at the outlet of the degassing box is 701℃. The plate filter box is built with two ceramic filter plates of 30+40ppi. The plate filter box is set to a temperature of 942℃, and the aluminum liquid temperature at the outlet of the plate filter box is 693℃. The aluminum melt after degassing and filtration flows directly into the front box; S5. Continuous casting: The molten metal flows into the front box through a vertical flow stabilizer. The temperature of the front box is maintained at 678°C. The casting nozzle is connected to the front box. The molten metal in the front box flows into the casting cavity of the casting machine through the casting nozzle. The cooling water circulating inside the steel belt cools the melt through the cooling steel belt. The molten metal solidifies in the casting cavity to form a cast billet. The stable flow of aluminum melt is discharged from the plate as the upper and lower steel belts rotate in the same direction. The casting speed is 7.0m / min and the thickness of the cast billet is 19mm. When continuously casting 4343 alloy, helium must be turned off and not used. The outlet temperature of the cast plate is controlled within the range of 500-560°C. S6. Three-stage rolling: The ingot enters the three-stage rolling mill for rolling through the looper table. The emulsion temperature of the first stand of the three-stage rolling mill is controlled at 49°C, the spraying volume is controlled at 4200L / min, and the slab outlet thickness is 9.8mm. The emulsion temperature of the second stand of the three-stage rolling mill is controlled at 49°C, the spraying volume is controlled at 3800L / min, and the slab outlet thickness is 5.8mm; the emulsion temperature of the third stand of the three-stage rolling mill is controlled at 49°C, the spraying volume is controlled at 3400L / min, and the slab outlet thickness is 3.9mm. The material at the outlet of the third stand of the three-stage rolling mill is directly coiled into a coil to obtain 4343 alloy billet. The surface of the aluminum coil coiled after three-stage rolling shall not have quality defects such as pressing marks, cracks, holes, etc.

[0019] The method for producing 4343 alloy blank with low carbon, low cost and safe production of the application produces 4343 alloy blank through continuous casting and rolling method, does not need to be matched with casting deep well, and does not need to use aluminum strontium alloy in the production process, has high safety degree, reduces production cost, and eliminates the phenomenon of strontium poisoning caused by misoperation of on-site operators. Since the continuous casting machine uses a steel belt with a thickness of 2.5 mm, the heat conduction efficiency is extremely high, the instantaneous cooling speed is high during continuous casting production, the blank will not produce flaky eutectic silicon, thus the possibility of cracks can be avoided, the blank organization grain is uniform and small, the silicon precipitation phase in the eutectic structure is distributed in the form of dots or spheres, the quality of the blank edge is good, and the crack caused by the crack will not appear in the subsequent rolling process, so that the subsequent cold rolling process can realize large processing rate rolling, the rolling efficiency is high, thereby the rolling pass is less, the rolling speed is fast, the production output per unit time is higher, and the production cost is lower. The finished product manufactured by the method for producing 4343 alloy blank with low carbon, low cost and safe production of the application has small crack edge, less material internal component segregation, is convenient for subsequent processing and use, and the raw material can use recycled aluminum in a large proportion, realizes the goal of low carbon and consumption reduction.

[0020] The part not described in detail in the application is prior art.

[0021] The examples selected in the text for the purpose of disclosing the inventive object of the application are currently considered appropriate, but it should be understood that the application is intended to include all changes and improvements of the examples that belong to the scope of the concept and the invention.

Claims

1. A method for producing 4343 alloy billets with low carbon content, low cost and safety, characterized by: The steps include: S1. Batching and smelting: 25-35% by mass of electrolytic aluminum liquid and 65-75% of recycled aluminum scrap are placed in a smelting furnace to prepare an aluminum melt, and quick-dissolving silicon, iron agent, copper agent, manganese agent, and titanium agent are added to the smelting furnace in sequence to adjust the alloy composition to meet the requirements. The mass percentages of the components are as follows: Si: 7.6-8.1%, Fe: 0.3-0.4%, Cu≤0.1%, Mn≤0.1%, Ti: 0.045-0.055%, other individual impurities ≤0.03%, total ≤0.15%, and the balance is Al; S2. Melt purification: Under electromagnetic stirring, the aluminum melt with qualified ingredients in the smelting furnace is refined by a refiner. The hydrogen content in the aluminum melt after refining is less than 0.15mg / 100gAl. The refining gas of the refiner is argon with an argon pressure of 0.5±0.1MPa. The aluminum melt after refining is deslagging. After deslagging, it is left to stand for more than 30 minutes before starting the furnace. The temperature of the aluminum melt at the outlet of the smelting furnace is 705℃~715℃. S3. Adding grain refiner: After starting the furnace, the aluminum melt flows smoothly into the diversion trough, and aluminum titanium boron wire is added to the aluminum melt at a uniform speed; S4, online degassing and filtration: The aluminum melt with grain refiner added flows into the degassing box, and argon is introduced into the degassing box for online degassing. The aluminum liquid temperature at the outlet of the degassing box is 695℃~705℃. After degassing, the aluminum melt enters the plate filter box for filtration. The aluminum liquid temperature at the outlet of the plate filter box is 685℃~695℃. The aluminum melt after degassing and filtration flows directly into the front box; S5. Continuous casting: The front box temperature is 670-680°C. The aluminum melt in the front box flows into the casting cavity of the casting machine through the casting nozzle. The aluminum melt solidifies in the casting cavity to form a cast billet. The stable flow of aluminum melt is discharged from the plate as the upper and lower steel belts rotate in the same direction. The outlet temperature of the casting plate is 500-560°C, the casting speed is 6.7-7.2m / min, and the thickness of the cast billet is 19mm. S6. Three-stage rolling: The cast billet passes through the looper table and enters the three-stage rolling mill for rolling. The outlet thickness of the slab from the first stand of the three-stage rolling mill is 9.0-10.0 mm, the outlet thickness of the slab from the second stand of the three-stage rolling mill is 5.0-6.0 mm, and the outlet thickness of the slab from the third stand of the three-stage rolling mill is 3.0-4.0 mm. The material from the outlet of the third stand of the three-stage rolling mill is directly coiled into a coil to obtain 4343 alloy billet.

2. The method for producing 4343 alloy billets with low carbon content, low cost and safety according to claim 1, wherein: In step S2, after the melt is refined, slag-skimmed and allowed to stand, samples are taken from both sides of the smelting furnace door to test the composition. The deviation of the content of each alloy is less than 0.01%.

3. The method for producing 4343 alloy billets with low carbon content, low cost and safety according to claim 1, characterized in that: In step S2, the speed of the refiner rotor is 450 rpm to 550 rpm, the rotor enters the aluminum melt from the refining window at a 45° angle, and the height of the aluminum melt is at least 30 cm higher than the liquid level when the rotor is completely submerged.

4. The method for producing 4343 alloy billets with low carbon content, low cost and safety according to claim 1, wherein: In step S2, the melt refining time is more than 50 minutes to ensure the melt refining effect and achieve local uniform stirring to avoid component segregation.

5. The method for producing 4343 alloy billets with low carbon content, low cost and safety according to claim 1, wherein: In step S3, aluminum titanium boron wire is added at a constant speed of 2.5±1 m / min.

6. The method for producing 4343 alloy billets with low carbon content, low cost and safety according to claim 1, characterized in that: In step S3, eight groups of aluminum titanium boron wires are added to the melt at a uniform speed, wherein two groups of aluminum titanium boron wires are added at the Y-type flow port, four groups of aluminum titanium boron wires are added after the degassing box, and two groups of aluminum titanium boron wires are added after the plate filter box. The addition distance of each group of aluminum titanium boron wires is more than 0.5 meters, and the positions for adding the aluminum titanium boron wires are respectively equipped with titanium wire stirring devices, and the speed of the titanium wire stirring devices is 60±2 rpm.

7. The method for producing 4343 alloy billets with low carbon content, low cost and safety according to claim 1, wherein: In step S4, the argon pressure in the degassing box is 0.5±0.05MPa, the rotor speed is 500±10 rpm, the gas temperature in the degassing box is 930℃~970℃, the plate filter box has two ceramic filter plates with 30+40ppi built in, and the temperature in the plate filter box is 910℃~950℃.

8. The method for producing 4343 alloy billets with low carbon content, low cost and safety according to claim 1, wherein: In step S5, the steel strip runout during continuous casting shall not exceed 0.01±0.005 mm. When continuously casting 4343 alloy, the helium gas used for cooling the casting machine shall be turned off.

9. The method for producing 4343 alloy billets with low carbon content, low cost and safety according to claim 1, wherein: In step S6, the mass percentage concentration of the emulsion during continuous rolling is 3.5±0.1%, and the emulsion temperature is 48±3°C.

10. The method for producing 4343 alloy billets with low carbon content, low cost and safety according to claim 1, wherein: In step S6, the emulsion spraying rate of the first stand of the three-row rolling mill is 3300L / min~4700L / min; the emulsion spraying rate of the second stand of the three-row rolling mill is 2900L / min~4100L / min; the emulsion spraying rate of the third stand of the three-row rolling mill is 2500L / min~3500L / min. The surface of the aluminum coil wound after continuous rolling has no quality defects such as pressing marks, cracked edges, holes, etc.