Preparation process for preparing 3003M aluminum alloy new energy battery water cooling plate

Abstract

The invention relates to the technical field of preparation of aluminum alloy strip new energy battery water-cooling plates, in particular to a preparation process for preparing a 3003M aluminum alloy new energy battery water-cooling plate. Comprising the steps of smelting, turning down, cast rolling and cold rolling. The 3003 + Zn alloy strip is produced by using an electrolytic aluminum liquid direct continuous casting and rolling process technology through improving components, the high-performance and high-quality 3003M aluminum alloy new energy battery water-cooling plate is obtained, a stable production process is determined, and a guarantee is provided for controlling the accuracy of parameters in all links of production; according to the 3003M aluminum alloy new energy battery water-cooling plate prepared through the method, the tensile strength ranges from 165 Mpa to 185 Mpa, the yield strength ranges from 65 Mpa to 100 Mpa, the ductility ranges from 15% to 35%, the user requirements are met, and the problem that an aluminum alloy strip for a new energy automobile battery water-cooling plate is prepared through a continuous casting and rolling technology instead of an existing method is solved.

Description

Technical Field

[0001] The invention relates to the technical field of preparing aluminum alloy strip new energy battery water cooling plates, and specifically to a preparation process for preparing 3003M aluminum alloy new energy battery water cooling plates. Background Art

[0002] The power battery is the core component of new energy vehicles. The 3003M aluminum alloy new energy battery water cooling plate is used in the power battery of new energy vehicles to make new energy vehicles lightweight.

[0003] 3003M aluminum alloy new energy battery water-cooling plate has high requirements for performance indicators and grain structure. In order to meet the requirements, a high content of alloy elements is added. At present, the domestic production of 3003M aluminum alloy new energy battery water-cooling plate basically adopts hot rolling process. Compared with continuous casting and rolling process, hot rolling process is not only costly, but also has disadvantages such as long process and long production cycle. Summary of the invention

[0004] The purpose of the present invention is to provide a preparation process for a 3003M aluminum alloy new energy battery water-cooling plate, which can utilize electrolytic aluminum liquid to directly cast and roll to prepare the 3003M aluminum alloy new energy battery water-cooling plate.

[0005] The invention discloses a preparation process for a 3003M aluminum alloy new energy battery water-cooling plate, wherein the mass percentage of the alloying elements of the 3003M aluminum alloy is as follows: Fe: 0.25%-0.30%, Si: 0.25%-0.30%, Cu: 0.70%-0.75%, Ti: 0.015%-0.030%, Mn: 1.40%-1.50%, Zn: 0.05%-0.10%, Mg: ≤0.02%, a single impurity content <0.03%, a total impurity content <0.15%, and the balance is Al.

[0006] The present invention provides a preparation process for a 3003M aluminum alloy new energy battery water cooling plate, comprising the following steps: S1. Melting: S1.1. The ingredients are prepared according to the mass percentage of the alloying elements of 3003M aluminum alloy, wherein Al uses more than 99.70% of electrolytic aluminum liquid and 18% to 30% of solid waste as raw materials; after the ingredients are prepared, the raw materials are placed in the furnace and are completely melted. When the aluminum liquid temperature reaches above 710°C, the surface scum is removed. After the scum is removed, the temperature is raised to 730°C and electromagnetic stirring is performed for 3 minutes to 5 minutes before sampling; S1.2. After the sample taken in step S1.1 is subjected to composition analysis, the temperature of the aluminum liquid is raised to 735°C. According to the mass percentage of the alloying elements of the 3003M aluminum alloy, the melt composition is adjusted to the middle limit except for Ti, and the Ti alloy composition is controlled at 0.008%-0.015%; according to the principle of high-temperature slag removal and low-temperature degassing, the aluminum liquid temperature is maintained at 745°C to 755°C, and the first refining agent of nitrogen + 1.0kg / t.Al to 1.5kg / t.Al is used. After powder spray refining, let it stand for 20 minutes, remove the slag, and then carry out electromagnetic stirring. The electromagnetic stirring time is 24-30 minutes. After the electromagnetic stirring is completed, take samples to test the composition of the aluminum liquid until the composition is qualified; after the composition is qualified, the aluminum liquid is heated to 720℃~735℃, and the second powder spray refining is carried out using argon + 0.6kg / t.Al~1.0kg / t.Al remelting type particle refining agent. After refining, let it stand for 20 minutes, remove the slag after standing until the aluminum liquid surface is mirror-like, and then pour the furnace; S2.Turning furnace: S2.1. After the converter, the static furnace is refined every 4 hours. The first refining is carried out using nitrogen + granular refining agent, and the refining agent dosage is 0.5 kg / t·Al -1.0kg / t·Al. The second refining is carried out using nitrogen + 100kg-120kg solid waste. The temperature of the aluminum liquid in the static furnace before refining is controlled at 750℃-755℃, and each refining time is 10min; S3. Casting and rolling: S3.1. After completing step S2, open the furnace eye, let the furnace aluminum liquid temperature stand at 740℃-750℃, control the aluminum liquid temperature at the furnace eye mouth at 730℃±3℃, add Al-Ti5-B1 ​​grain refiner after preheating temperature>100℃ at the furnace eye, and control the online Ti increment to above 0.008%; the aluminum liquid flows into the online degassing box, and two gases are introduced, both of which are argon with a purity of 99.995%. One of the two gases is introduced into the silicon nitride rotor for online degassing, the working gas pressure is 0.30 MPa-0.55MPa, the flow rate is L / Min 4-15L / Min, and the other of the two gases is used as a covering gas for liquid surface protection, the gas pressure is ≥0.2MPa, the gas flow rate is 10 L / Min-20L / Min, and the temperature is 20℃; after the aluminum liquid flows out of the degassing box, it enters the filter box, and the filter box adopts a foam ceramic filter plate + ceramic filter tube bipolar filter device; S3.2. The casting and rolling adopts a double-roll inclined casting and rolling mill. The upper and lower rolls of the casting and rolling mill are made of alloy steel roll sleeves. The casting and rolling zone is 48mm-58mm long, the front box temperature is controlled at 705℃-710℃, the casting and rolling speed is 650 mm / min-850mm / min, the cooling water temperature is 29℃-33℃, and the cast and rolled strip with a thickness of 6.5mm-7.0mm is obtained. After the coil is naturally cooled to room temperature, cold rolling production begins; S4. Cold rolling: The billet uniform annealing process is adopted, and the cast-rolled strip obtained in step S3.2 is subjected to homogenization annealing according to an annealing process of 540℃~600℃ / 6h. After being taken out of the furnace, when the material temperature drops to room temperature, it is rolled to a thickness of 2.8mm~3.0mm according to a cold rolling process rate of 55%, and the edge cracks are cut off according to a trimming amount of 50mm~70mm. Then, it is rolled to 1.0mm through cold rolling process rates of 47% and 38%. After the material temperature drops to room temperature, the surface oil and aluminum powder are cleaned; after trimming to the specified width range, the finished product is annealed to a tensile strength Rm of 145 MPa-165MPa and an elongation A50≥15%, and the finished product annealing process is 295℃~340℃ / 4h; at this point, the processing of 3003M is completed.

[0007] In step S1.2, the electromagnetic stirring is performed for 24 min to 30 min each time after slagging to ensure uniform diffusion of alloy elements and avoid deposition.

[0008] Furthermore, in step S3.2, the front box uses a high-precision laser flow control system to control the liquid level, requiring the liquid level fluctuation amplitude to be ≤±0.3mm.

[0009] The beneficial effects of the present invention are as follows: based on 3003 alloy, the present invention proposes to produce 3003+Zn alloy strips by using electrolytic aluminum liquid direct continuous casting and rolling process technology by improving the composition, innovatively adding trace Zn elements, and successfully producing high-Cu and high-Mn alloy strips for the first time by using continuous casting and rolling process, solving the technical problem of high-alloy melt sticking to rollers in the continuous casting and rolling process, obtaining high-performance and high-quality 3003M aluminum alloy new energy battery water-cooling plates, determining a stable production process, providing a guarantee for accurately controlling parameters in various links of production, achieving stable product quality in large-scale industrial production, with low production control difficulty, and mechanical properties meeting user requirements, and strip products meeting user stamping requirements; the 3003M aluminum alloy new energy battery water-cooling plates prepared by the present invention have a tensile strength of 165 Mpa-185 Mpa, a yield strength of 65 Mpa-100 Mpa, and an elongation of 15%-35%, meeting user requirements, and solving the problem of using continuous casting and rolling process to replace the existing method to prepare aluminum alloy strips for new energy vehicle battery water-cooling plates. DETAILED DESCRIPTION

[0010] The invention discloses a preparation process for a 3003M aluminum alloy new energy battery water-cooling plate, wherein the mass percentage of the alloying elements of the 3003M aluminum alloy is as follows: Fe: 0.25%-0.30%, Si: 0.25%-0.30%, Cu: 0.70%-0.75%, Ti: 0.015%-0.030%, Mn: 1.40%-1.50%, Zn: 0.05%-0.10%, Mg: ≤0.02%, a single impurity content <0.03%, a total impurity content <0.15%, and the balance is Al.

[0011] The present invention provides a preparation process for a 3003M aluminum alloy new energy battery water cooling plate, comprising the following steps: S1. Melting: S1.1. The ingredients are prepared according to the mass percentage of the alloying elements of 3003M aluminum alloy, wherein Al uses more than 99.70% of electrolytic aluminum liquid and 18% to 30% of solid waste as raw materials; after the ingredients are prepared, the raw materials are placed in the furnace and are completely melted. When the aluminum liquid temperature reaches above 710°C, the surface scum is removed. After the scum is removed, the temperature is raised to 730°C and electromagnetic stirring is performed for 3 minutes to 5 minutes before sampling; S1.2. After the sample taken in step S1.1 is subjected to composition analysis, the temperature of the aluminum liquid is raised to 735°C. According to the mass percentage of the alloying elements of the 3003M aluminum alloy, the melt composition is adjusted to the middle limit except for Ti, and the Ti alloy composition is controlled at 0.008%-0.015%. According to the principle of high-temperature slag removal and low-temperature degassing, the aluminum liquid temperature is maintained at 745°C to 755°C, and the first powder spray refining is carried out using nitrogen + 1.0kg / t.Al to 1.5kg / t.Al particle refining agent. After the refining is completed, it is allowed to stand for 20 minutes, and the slag is removed. After slagging, electromagnetic stirring is carried out for 24-30 minutes. After the electromagnetic stirring is completed, the aluminum liquid is sampled and tested for the composition until the composition is qualified; after the composition is qualified, the aluminum liquid is heated to 720℃~735℃, and a second powder spray refining is carried out using argon + 0.6kg / t.Al~1.0kg / t.Al remelting type particle refining agent. After refining, it is allowed to stand for 20 minutes. After standing, the slag is removed until the aluminum liquid surface is mirror-like and then the furnace is poured; each electromagnetic stirring after slagging lasts for 24-30 minutes to ensure uniform diffusion of alloy elements and avoid deposition; S2.Turning furnace: S2.1. After the converter, the static furnace is refined every 4 hours. The first refining is carried out using nitrogen + granular refining agent, and the refining agent dosage is 0.5 kg / t·Al -1.0kg / t·Al. The second refining is carried out using nitrogen + 100kg-120kg solid waste. The temperature of the aluminum liquid in the static furnace before refining is controlled at 750℃-755℃, and each refining time is 10min; S3. Casting and rolling: S3.1. After completing step S2, open the furnace eye, let the furnace aluminum liquid temperature stand at 740℃-750℃, control the aluminum liquid temperature at the furnace eye mouth at 730℃±3℃, add Al-Ti5-B1 ​​grain refiner after preheating temperature>100℃ at the furnace eye, and control the online Ti increment to above 0.008%; the aluminum liquid flows into the online degassing box, and two gases are introduced, both of which are argon with a purity of 99.995%. One of the two gases is introduced into the silicon nitride rotor for online degassing, the working gas pressure is 0.30 MPa-0.55MPa, the flow rate is L / Min 4-15L / Min, and the other of the two gases is used as a covering gas for liquid surface protection, the gas pressure is ≥0.2MPa, the gas flow rate is 10 L / Min-20L / Min, and the temperature is 20℃; after the aluminum liquid flows out of the degassing box, it enters the filter box, and the filter box adopts a foam ceramic filter plate + ceramic filter tube bipolar filter device; S3.2. The casting and rolling adopts a double-roll inclined casting and rolling machine. The upper and lower rolls of the casting and rolling machine are made of alloy steel roll sleeves. The casting and rolling area is 48mm-58mm long, the front box temperature is controlled at 705℃-710℃, the casting and rolling speed is 650 mm / min-850mm / min, the cooling water temperature is 29℃-33℃, and the cast and rolled strip with a thickness of 6.5mm-7.0mm is obtained. After the material coil is naturally cooled to room temperature, cold rolling production begins; the front box adopts a high-precision laser flow control system to control the liquid level height, and the liquid level height fluctuation amplitude is required to be ≤±0.3mm; it should be noted that the front box liquid level height, nozzle roller gap, casting and rolling speed and cooling intensity should be matched according to the actual production to ensure that there is no water ripple defect on the surface of the cast and rolled billet; S4. Cold rolling: The billet uniform annealing process is adopted, and the cast-rolled strip obtained in step S3.2 is subjected to homogenization annealing according to an annealing process of 540℃~600℃ / 6h. After being taken out of the furnace, when the material temperature drops to room temperature, it is rolled to a thickness of 2.8mm~3.0mm according to a cold rolling process rate of 55%, and the edge cracks are cut off according to a trimming amount of 50mm~70mm. Then, it is rolled to 1.0mm through cold rolling process rates of 47% and 38%. After the material temperature drops to room temperature, the surface oil and aluminum powder are cleaned; after trimming to the specified width range, the finished product is annealed to a tensile strength Rm of 145 MPa-165MPa and an elongation A50≥15%, and the finished product annealing process is 295℃~340℃ / 4h; at this point, the processing of 3003M is completed.

[0012] The present invention is based on 3003 alloy. By improving the composition, it is proposed to use the electrolytic aluminum liquid direct continuous casting and rolling process technology to produce 3003+Zn alloy strips, and obtain high-performance and high-quality 3003M aluminum alloy new energy battery water-cooling plates. A stable production process is determined, which provides a guarantee for accurately controlling the parameters of each link in the production, and achieves stable product quality in large-scale industrial production. The production control difficulty is relatively low, the mechanical properties meet the user requirements, and the strip products meet the user's stamping requirements.

[0013] Example 1 The invention discloses a preparation process for a 3003M aluminum alloy new energy battery water-cooling plate, wherein the mass percentage of the alloying elements of the 3003M aluminum alloy is as follows: Fe: 0.25%-0.30%, Si: 0.25%-0.30%, Cu: 0.70%-0.75%, Ti: 0.015%-0.030%, Mn: 1.40%-1.50%, Zn: 0.05%-0.10%, Mg: ≤0.02%, a single impurity content <0.03%, a total impurity content <0.15%, and the balance is Al.

[0014] The present invention provides a preparation process for a 3003M aluminum alloy new energy battery water cooling plate, comprising the following steps: S1. Melting: S1.1. The ingredients are prepared according to the mass percentage of the alloying elements of 3003M aluminum alloy, wherein Al uses more than 99.70% of electrolytic aluminum liquid and 18% to 30% of solid waste as raw materials; after the ingredients are prepared, the raw materials are placed in the furnace and are completely melted. When the aluminum liquid temperature reaches above 710°C, the surface scum is removed. After the scum is removed, the temperature is raised to 730°C and electromagnetic stirring is performed for 3 minutes to 5 minutes before sampling; S1.2. After the sample taken in step S1.1 is subjected to composition analysis, the temperature of the aluminum liquid is raised to 735°C. According to the mass percentage of the alloying elements of the 3003M aluminum alloy, the melt composition is adjusted to the middle limit except for Ti, and the Ti alloy composition is controlled at 0.008%-0.015%. According to the principle of high-temperature slag removal and low-temperature degassing, the aluminum liquid temperature is maintained at 745°C to 755°C, and the first powder spray refining is carried out using nitrogen + 1.0kg / t.Al to 1.5kg / t.Al particle refining agent. After the refining is completed, it is allowed to stand for 20 minutes. Slag removal, electromagnetic stirring is performed after slag removal, and the electromagnetic stirring time is ≤30min. After the electromagnetic stirring is completed, the aluminum liquid is sampled and tested for the composition until the composition is qualified; after the composition is qualified, the aluminum liquid is heated to 720℃~735℃, and a second powder spray refining is performed using argon + 0.6kg / t.Al~1.0kg / t.Al remelting type particle refining agent. After refining, it is allowed to stand for 20min. After standing still, the slag is removed until the aluminum liquid surface becomes a mirror surface and then the furnace is poured; each time the electromagnetic stirring after slag removal lasts for 24min-30min to ensure uniform diffusion of alloy elements and avoid deposition; S2.Turning furnace: S2.1. After the converter, the static furnace is refined every 4 hours. The first refining is carried out using nitrogen + granular refining agent, and the refining agent dosage is 0.5 kg / t·Al -1.0kg / t·Al. The second refining is carried out using nitrogen + 100kg-120kg solid waste. The temperature of the aluminum liquid in the static furnace before refining is controlled at 750℃-755℃, and each refining time is 10min; S3. Casting and rolling: S3.1. After completing step S2, open the furnace eye, let the furnace aluminum liquid temperature stand at 740℃-750℃, control the aluminum liquid temperature at the furnace eye mouth at 735℃±3℃, add Al-Ti5-B1 ​​grain refiner after preheating temperature>100℃ at the furnace eye, and control the online Ti increment to above 0.008%; the aluminum liquid flows into the online degassing box, and two gases are introduced, both of which are argon with a purity of 99.995%. One of the two gases is introduced into the silicon nitride rotor for online degassing, the working gas pressure is 0.30 MPa-0.55MPa, the flow rate is L / Min 4-15L / Min, and the other of the two gases is used as a covering gas for liquid surface protection, the gas pressure is ≥0.2MPa, the gas flow rate is 10 L / Min-20L / Min, and the temperature is 20℃; after the aluminum liquid flows out of the degassing box, it enters the filter box, and the filter box adopts a foam ceramic filter plate + ceramic filter tube bipolar filter device; S3.2. The casting and rolling adopts a double-roll inclined casting and rolling machine. The upper and lower rolls of the casting and rolling machine are made of alloy steel roll sleeves. The casting and rolling area is 48mm-58mm long, the front box temperature is controlled at 705℃-710℃, the casting and rolling speed is 650 mm / min-850mm / min, the cooling water temperature is 29℃-33℃, and the cast and rolled strip with a thickness of 6.5mm-7.0mm is obtained. After the material coil is naturally cooled to room temperature, cold rolling production begins; the front box adopts a high-precision laser flow control system to control the liquid level height, and the liquid level height fluctuation amplitude is required to be ≤±0.3mm; it should be noted that the front box liquid level height, nozzle roller gap, casting and rolling speed and cooling intensity should be matched according to the actual production to ensure that there is no water ripple defect on the surface of the cast and rolled billet; S4. Cold rolling: The billet uniform annealing process is adopted, and the cast-rolled strip obtained in step S3.2 is subjected to homogenization annealing according to an annealing process of 540℃~600℃ / 6h. After being taken out of the furnace, when the material temperature drops to room temperature, it is rolled to a thickness of 2.8mm~3.0mm according to a cold rolling process rate of 55%, and the edge cracks are cut off according to a trimming amount of 50mm~70mm. Then, it is rolled to 1.0mm through cold rolling process rates of 47% and 38%. After the material temperature drops to room temperature, the surface oil and aluminum powder are cleaned; after trimming to the specified width range, the finished product is annealed to a tensile strength Rm of about 184MPa and an elongation A50 of about 18%, and the finished product annealing process is 295℃~340℃ / 4h; at this point, the processing of 3003M is completed.

[0015] Example 2 Fe: 0.47%~0.52%, Si: ≤0.15%, Cu: 0.06%~0.10%, Ti: 0.015%~0.030%, Mn: 1.00%~1.10%, Zn: ≤0.02%, Mg: ≤0.02%, single impurity content <0.03%, total impurity content <0.15%, and the balance is Al.

[0016] S1. Melting: S1.1. The ingredients are prepared according to the mass percentage of the alloying elements of 3003 aluminum alloy, where Al uses more than 99.70% of electrolytic aluminum liquid and 15% to 20% of solid waste as raw materials; after the ingredients are prepared, the raw materials are placed in the furnace and are completely melted. When the aluminum liquid temperature reaches above 710°C, the surface scum is removed. After the scum is removed, the temperature is raised to 730°C and electromagnetic stirring is performed for 3 minutes to 5 minutes before sampling; S1.2. After the sample taken in step S1.1 is subjected to composition analysis, the temperature of the aluminum liquid is raised to 735°C. According to the mass percentage of the alloying elements of the 3003M aluminum alloy, the melt composition is adjusted to the middle limit except for Ti, and the Ti alloy composition is controlled at 0.008%-0.015%. According to the principle of high-temperature slag removal and low-temperature degassing, the aluminum liquid temperature is maintained at 730°C to 745°C, and the first powder spray refining is carried out using nitrogen + 1.0kg / t.Al to 1.5kg / t.Al particle refining agent. After the refining is completed, it is allowed to stand for 20 minutes. , slag removal, electromagnetic stirring after slag removal, electromagnetic stirring time ≤ 30min, after electromagnetic stirring is completed, sample and test the composition of aluminum liquid until the composition is qualified; after the composition is qualified, the aluminum liquid is heated to 720℃~735℃, and the second powder spray refining is carried out using argon + 0.6kg / t.Al~1.0kg / t.Al particle refining agent. After refining, let it stand for 20min, and then remove the slag until the surface of the aluminum liquid is mirror-like and then pour the furnace; each time of electromagnetic stirring after slag removal lasts 24min-30min to ensure uniform diffusion of alloy elements and avoid deposition; S2.Turning furnace: S2.1. After the converter, the static furnace is refined every 5 hours. The first refining is carried out using nitrogen + granular refining agent, and the refining agent dosage is 0.5 kg / t·Al -1.0kg / t·Al. The second refining is carried out using nitrogen + 80kg-100kg solid waste. The temperature of the aluminum liquid in the static furnace before refining is controlled at 750℃-755℃, and each refining time is 10min; S3. Casting and rolling: S3.1. After completing step S2, open the furnace eye, let the furnace aluminum liquid temperature stand at 740℃-750℃, control the aluminum liquid temperature at the furnace eye mouth at 730℃±3℃, add Al-Ti5-B1 ​​grain refiner after preheating temperature>100℃ at the furnace eye, and control the online Ti increment to above 0.008%; the aluminum liquid flows into the online degassing box, and two gases are introduced, both of which are argon with a purity of 99.995%. One of the two gases is introduced into the silicon nitride rotor for online degassing, the working gas pressure is 0.30 MPa-0.55MPa, the flow rate is L / Min 4-15L / Min, and the other of the two gases is used as a covering gas for liquid surface protection, the gas pressure is ≥0.2MPa, the gas flow rate is 10 L / Min-20L / Min, and the temperature is 20℃; after the aluminum liquid flows out of the degassing box, it enters the filter box, and the filter box adopts a foam ceramic filter plate + ceramic filter tube bipolar filter device; S3.2. Casting and rolling adopts a double-roll inclined casting and rolling machine. The upper and lower rolls of the casting and rolling machine are made of alloy steel roll sleeves. The casting and rolling area is 52mm-58mm long. The temperature of the front box is controlled at 701℃-710℃, the casting and rolling speed is 850mm / min-900mm / min, and the cooling water temperature is 30℃-35℃. The cast and rolled strip with a thickness of 6.5mm-7.0mm is obtained. After the coil is naturally cooled to room temperature, cold rolling production begins; the front box adopts a high-precision laser flow control system to control the liquid level height, and the liquid level height fluctuation amplitude is required to be ≤±0.3mm; it should be noted that the liquid level height of the front box, the gap between the nozzle rollers, the casting and rolling speed and the cooling intensity should be matched according to the actual production to ensure that there is no water ripple defect on the surface of the cast and rolled billet; S4. Cold rolling: The billet uniform annealing process is adopted, and the cast-rolled strip obtained in step S3.2 is rolled to a thickness of 0.8mm-1.0mm according to a cold rolling process rate of 84%, and the edge cracks are cut off according to a trimming amount of 50mm-70mm. After the material temperature drops to room temperature, the surface oil and aluminum powder are cleaned; the finished product is annealed to a tensile strength Rm of about 161MPa and an elongation A50 of 8%-10%, and the finished product annealing process is 560℃-580℃ / 4h; at this point, 3003 processing is completed.

[0017] Example 3 Fe: 0.40%~0.45%, Si: 0.53%~0.58%, Cu: 0.48%~0.52%, Ti: 0.015%~0.030%, Mn: 1.40%~1.45%, Zn: ≤0.02%, Mg: ≤0.02%, single impurity content <0.03%, total impurity content <0.15%, and the balance is Al.

[0018] S1. Melting: S1.1. The ingredients are prepared according to the mass percentage of the alloying elements of 3003M aluminum alloy, wherein Al uses more than 99.70% of electrolytic aluminum liquid and 18% to 30% of solid waste as raw materials; after the ingredients are prepared, the raw materials are placed in the furnace and are completely melted. When the aluminum liquid temperature reaches above 710°C, the surface scum is removed. After the scum is removed, the temperature is raised to 730°C and electromagnetic stirring is performed for 3 minutes to 5 minutes before sampling; S1.2. After the sample taken in step S1.1 is subjected to composition analysis, the temperature of the aluminum liquid is raised to 735°C. According to the mass percentage of the alloying elements of the 3003M aluminum alloy, the melt composition is adjusted to the middle limit except for Ti, and the Ti alloy composition is controlled at 0.008%-0.015%. According to the principle of high-temperature slag removal and low-temperature degassing, the aluminum liquid temperature is maintained at 745°C to 755°C, and the first powder spray refining is carried out using nitrogen + 1.0kg / t.Al to 1.5kg / t.Al particle refining agent. After the refining is completed, it is allowed to stand for 20 minutes. Slag removal, electromagnetic stirring is performed after slag removal, and the electromagnetic stirring time is ≤30min. After the electromagnetic stirring is completed, the aluminum liquid is sampled and tested for the composition until the composition is qualified; after the composition is qualified, the aluminum liquid is heated to 720℃~735℃, and a second powder spray refining is performed using argon + 0.6kg / t.Al~1.0kg / t.Al remelting type particle refining agent. After refining, it is allowed to stand for 20min. After standing still, the slag is removed until the aluminum liquid surface becomes a mirror surface and then the furnace is poured; each time the electromagnetic stirring after slag removal lasts for 24min-30min to ensure uniform diffusion of alloy elements and avoid deposition; S2.Turning furnace: S2.1. After the converter, the static furnace is refined every 4 hours. The first refining is carried out using nitrogen + granular refining agent, and the refining agent dosage is 0.5 kg / t·Al -1.0kg / t·Al. The second refining is carried out using nitrogen + 100kg-120kg solid waste. The temperature of the aluminum liquid in the static furnace before refining is controlled at 750℃-755℃, and each refining time is 10min; S3. Casting and rolling: S3.1. After completing step S2, open the furnace eye, let the furnace aluminum liquid temperature stand at 740℃-750℃, control the aluminum liquid temperature at the furnace eye mouth at 730℃±3℃, add Al-Ti5-B1 ​​grain refiner after preheating temperature>100℃ at the furnace eye, and control the online Ti increment to above 0.008%; the aluminum liquid flows into the online degassing box, and two gases are introduced, both of which are argon with a purity of 99.995%. One of the two gases is introduced into the silicon nitride rotor for online degassing, the working gas pressure is 0.30 MPa-0.55MPa, the flow rate is L / Min 4-15L / Min, and the other of the two gases is used as a covering gas for liquid surface protection, the gas pressure is ≥0.2MPa, the gas flow rate is 10 L / Min-20L / Min, and the temperature is 20℃; after the aluminum liquid flows out of the degassing box, it enters the filter box, and the filter box adopts a foam ceramic filter plate + ceramic filter tube bipolar filter device; S3.2. Casting and rolling adopts a double-roll inclined casting and rolling machine. The upper and lower rolls of the casting and rolling machine are made of alloy steel roll sleeves. The casting and rolling area is 45mm-50mm long, the front box temperature is controlled at 705℃-715℃, the casting and rolling speed is 750 mm / min-800mm / min, and the cooling water temperature is 25℃-30℃. The cast and rolled strip with a thickness of 6.5mm-7.0mm is obtained. After the material coil is naturally cooled to room temperature, cold rolling production begins; the front box adopts a high-precision laser flow control system to control the liquid level height, and the liquid level height fluctuation amplitude is required to be ≤±0.3mm; it should be noted that the front box liquid level height, nozzle roller gap, casting and rolling speed and cooling intensity should be matched according to the actual production to ensure that there is no water ripple defect on the surface of the cast and rolled billet; S4. Cold rolling: The billet uniform annealing process is adopted. When the cast-rolled strip obtained in step S3.2 is rolled to a thickness of 4.0mm-4.5mm at a cold rolling pass processing rate of 30%, intermediate annealing is adopted, and the intermediate annealing process is 430℃-450℃ / 4h. It is rolled to 2.3mm-5.4mm at a cold rolling pass processing rate of 55%, and the edge cracks are removed with a trimming amount of 50mm-70mm. Then, it is rolled to 1.0mm at a cold rolling pass processing rate of 38% and 33%. After the material temperature drops to room temperature, the surface oil and aluminum powder are cleaned; after trimming to the specified width range, the finished product annealing is carried out to a tensile strength Rm of about 174MPa and an elongation A50 of about 14%, and the finished product annealing process is 350℃-370℃ / 4h; at this point, the processing of 3003M is completed.

[0019] The present invention innovatively adds a trace amount of Zn element and successfully produces high-Cu, high-Mn alloy strips for the first time using a continuous casting and rolling process, solving the technical problem of high-alloy melt sticking to the roller during the continuous casting and rolling process.

[0020] The 3003M aluminum alloy new energy battery water-cooling plate prepared by the present invention has a tensile strength of 165 MPa-185 MPa, a yield strength of 65 MPa-100 MPa, and an elongation of 15%-35%, which meets user requirements and solves the problem of using a continuous casting and rolling process to replace the existing method to prepare aluminum alloy strips for new energy vehicle battery water-cooling plates.

Claims

1. A preparation process for 3003M aluminum alloy new energy battery water cooling plate, characterized in that: The mass percentage of the alloying elements of 3003M aluminum alloy is: Fe: 0.25%~0.30%, Si: 0.25%~0.30%, Cu: 0.70%~0.75%, Ti: 0.015%~0.030%, Mn: 1.40%~1.50%, Zn: 0.05%~0.10%, Mg: ≤0.02%, single impurity content <0.03%, total impurity content <0.15%, and the balance is Al.

2. According to claim 1, a preparation process for preparing a 3003M aluminum alloy new energy battery water cooling plate is characterized in that: The steps include: S1. Melting: S1.

1. The ingredients are prepared according to the mass percentage of the alloying elements of 3003M aluminum alloy, wherein Al uses more than 99.70% of electrolytic aluminum liquid and 18% to 30% of solid waste as raw materials; after the ingredients are prepared, the raw materials are placed in the furnace and are completely melted. When the aluminum liquid temperature reaches above 710°C, the surface scum is removed. After the scum is removed, the temperature is raised to 730°C and electromagnetic stirring is performed for 3 minutes to 5 minutes before sampling; S1.

2. After the sample taken in step S1.1 is subjected to composition analysis, the temperature of the aluminum liquid is raised to 735°C. According to the mass percentage of the alloying elements of the 3003M aluminum alloy, the melt composition is adjusted to the middle limit except for Ti, and the Ti alloy composition is controlled at 0.008%-0.015%; according to the principle of high-temperature slag removal and low-temperature degassing, the aluminum liquid temperature is maintained at 745°C to 755°C, and the first refining agent of nitrogen + 1.0kg / t.Al to 1.5kg / t.Al is used. After powder spray refining, let it stand for 20 minutes, remove the slag, and then carry out electromagnetic stirring. The electromagnetic stirring time is 24-30 minutes. After the electromagnetic stirring is completed, take samples to test the composition of the aluminum liquid until the composition is qualified; after the composition is qualified, the aluminum liquid is heated to 720℃~735℃, and the second powder spray refining is carried out using argon + 0.6kg / t.Al~1.0kg / t.Al remelting type particle refining agent. After refining, let it stand for 20 minutes, remove the slag after standing until the aluminum liquid surface is mirror-like, and then pour the furnace; S2.Turning furnace: S2.

1. After the converter, the static furnace is refined every 4 hours. The first refining is carried out using nitrogen + granular refining agent, and the refining agent dosage is 0.5 kg / t·Al -1.0kg / t·Al. The second refining is carried out using nitrogen + 100kg-120kg solid waste. The temperature of the aluminum liquid in the static furnace before refining is controlled at 750℃-755℃, and each refining time is 10min; S3. Casting and rolling: S3.

1. After completing step S2, open the furnace eye, let the furnace aluminum liquid temperature stand at 740℃-750℃, control the aluminum liquid temperature at the furnace eye mouth at 730℃±3℃, add Al-Ti5-B1 ​​grain refiner after preheating temperature>100℃ at the furnace eye, and control the online Ti increment to above 0.008%; the aluminum liquid flows into the online degassing box, and two gases are introduced, both of which are argon with a purity of 99.995%. One of the two gases is introduced into the silicon nitride rotor for online degassing, the working gas pressure is 0.30 MPa-0.55MPa, the flow rate is L / Min 4-15L / Min, and the other of the two gases is used as a covering gas for liquid surface protection, the gas pressure is ≥0.2MPa, the gas flow rate is 10 L / Min-20L / Min, and the temperature is 20℃; after the aluminum liquid flows out of the degassing box, it enters the filter box, and the filter box adopts a foam ceramic filter plate + ceramic filter tube bipolar filter device; S3.

2. The casting and rolling adopts a double-roll inclined casting and rolling mill. The upper and lower rolls of the casting and rolling mill are made of alloy steel roll sleeves. The casting and rolling zone is 48mm-58mm long, the front box temperature is controlled at 705℃-710℃, the casting and rolling speed is 650 mm / min-850mm / min, the cooling water temperature is 29℃-33℃, and the cast and rolled strip with a thickness of 6.5mm-7.0mm is obtained. After the coil is naturally cooled to room temperature, cold rolling production begins; S4. Cold rolling: The billet uniform annealing process is adopted, and the cast-rolled strip obtained in step S3.2 is subjected to homogenization annealing according to an annealing process of 540℃~600℃ / 6h. After being taken out of the furnace, when the material temperature drops to room temperature, it is rolled to a thickness of 2.8mm~3.0mm according to a cold rolling process rate of 55%, and the edge cracks are cut off according to a trimming amount of 50mm~70mm. Then, it is rolled to 1.0mm through cold rolling process rates of 47% and 38%. After the material temperature drops to room temperature, the surface oil and aluminum powder are cleaned; after trimming to the specified width range, the finished product is annealed to a tensile strength Rm of 145 MPa-165MPa and an elongation A50≥15%, and the finished product annealing process is 295℃~340℃ / 4h; at this point, the processing of 3003M is completed.

3. A process for preparing a 3003M aluminum alloy new energy battery water cooling plate according to claim 2, characterized in that: In the step S3.2, the front box uses a high-precision laser flow control system to control the liquid level height, and the liquid level height fluctuation amplitude is required to be ≤±0.3mm.