Process for producing 1060 aluminum alloy deep drawing material through continuous cast rolling

Abstract

The invention relates to the technical field of aluminum alloy production, in particular to a process for producing a 1060 aluminum alloy deep drawing material through continuous cast rolling, which comprises the following steps of: screening electrolytic aluminum liquid, proportioning, refining in a furnace, carrying out online treatment, carrying out cast rolling and carrying out cold rolling, according to the method, pure electrolytic aluminum liquid and aluminum ingots are selected, alloy element composition is optimized, metal Sr is added into alloy components to conduct modification treatment on melt, spheroidizing treatment of an AlFeSi secondary phase is achieved, the grain uniformity of materials is improved, and the metallurgical quality of cast-rolled strip billets is improved; the crushing effect of a grain structure and a secondary phase is improved through a large machining rate, a finished product annealing process between recovery and complete recrystallization is adopted, the basic balance of an internal deformation texture and a cubic texture of the material is adjusted, the deep drawing performance of the material is improved, the earing rate of the 1060 deep drawing material is controlled within 2%, grain refinement during recrystallization annealing is facilitated, and the yield of the 1060 deep drawing material is improved. The problem that lines on the high-deep-drawing surface are thick is solved.

Description

Technical Field

[0001] The invention relates to the technical field of aluminum alloy production, in particular to a process for producing 1060 aluminum alloy deep-drawing material by continuous casting and rolling. Background Art

[0002] The existing technology has changed the production method of a large number of aluminum alloy products for cookware from hot rolling to casting and rolling. The production of 1060 aluminum alloy deep-drawing materials by electrolytic aluminum liquid casting and rolling is the shortest processing method at present. The energy medium consumption is one-third of the hot rolling production method. It has significant environmental and economic benefits, and the performance can also meet the needs. It has been widely adopted in the industry. 1060 aluminum alloy deep-drawing materials are widely used in the field of cookware, and there are strict requirements on the elongation and earing rate of aluminum plate and strip products. Summary of the invention

[0003] The purpose of the present invention is to provide a process for producing 1060 aluminum alloy deep-drawing material by continuous casting and rolling. By adding the alloy element Sr and further optimizing the casting and rolling process parameters of the 1060 aluminum alloy, a casting and rolling billet with fine and uniform grains is produced, and then through reasonable pass distribution and heat treatment process, a 1060 aluminum alloy deep-drawing material with fine grains and small anisotropy is finally obtained.

[0004] The present invention discloses a process for producing 1060 aluminum alloy deep-drawing material by continuous casting and rolling, comprising the following steps: S1. Screening of electrolytic aluminum liquid: Screen the electrolytic aluminum liquid from the source of aluminum electrolysis, and select the electrolytic aluminum liquid in the electrolytic cell as the raw material. The electrolytic aluminum liquid is required to meet the following conditions: Fe≤0.15%; Si≤0.04%; Na content≤0.007%; S2. Ingredients: The materials are added to the smelting furnace according to the charge, solid materials are added first, and then the electrolytic aluminum liquid selected in step S1 is added, the weight of the solid materials accounts for 30%-35% of the total charge of the materials, and the temperature is raised after all the materials are put into the furnace, and waste materials below the first level shall not be added; after all the solid materials in the smelting furnace are melted, the composition is adjusted, and the aluminum liquid in the smelting furnace is adjusted to be composed of the following mass percentages: Fe is 0.20%-0.26%; Si is 0.048%-0.06%; Ti is 0.010%-0.020%; Sr is 0.010%-0.012%; other impurities are ≤0.15%; the balance is Al; S3. Furnace refining: S3.1. Refining in the smelting furnace: S3.1.1. When the aluminum liquid temperature reaches 730℃, the first refining begins. The melt refining uses a remelting type particle refining agent with a dosage of 1.0kg / t·Al. Argon is used to evenly load the remelting particle refining agent into the aluminum liquid. The refining covers all areas of the aluminum liquid. The refining time is 25 minutes. After the refining is completed, the slag is allowed to stand and the slag is removed; S3.1.2. After the slag removal is completed, samples are taken to adjust the chemical composition, and the intermediate alloy is added according to the target composition range of each alloy. After the components other than Ti meet the mass percentage composition recorded in step S2, a second refining is performed; S3.1.3. The amount of refining agent used in the second refining is 0.6kg / t·Al, the refining time is 20min, after the refining is completed, the slag is allowed to stand and then the converter is used; S3.1.4. The converter temperature of the aluminum liquid in the smelting furnace is 735℃-750℃. After the temperature and composition of the smelting furnace meet the control requirements, the converter is started. During the converter process, AlTi10 master alloy is added to the converter chute, and the Ti content of the melt is 0.005%-0.008%; S3.2. Static furnace refining: S3.2.1. The aluminum liquid is kept at a temperature of 740℃-750℃ after the melt is transferred from the converter to the static furnace to ensure that the aluminum liquid temperature at the static furnace eye is controlled at 720℃-725℃. Refining begins within 20 minutes after the furnace is poured; S3.2.2. The refining adopts Ar+remelting type granular refining agent, the refining agent dosage is 1.0kg / t·Al, the refining time is 20min, and the slag is removed 30min after refining; S4. Online processing: The melt after completing step S3 is processed online, and the Al-Ti5-B1 ​​grain refiner is preheated and added at the inlet of the degassing box. The temperature of the preheated Al-Ti5-B1 ​​grain refiner before entering the aluminum liquid is not less than 400°C. The amount of Al-Ti5-B1 ​​grain refiner added is 1.8kg / t·Al of the aluminum liquid passing through. The temperature of the melt at the adding point is not less than 715°C, and the final mass percentage of Ti is controlled at 0.010%-0.020%; the aluminum liquid flows out of the degassing box and enters the filter box, and the filter box adopts a 40 mesh + 50 mesh foam ceramic filter plate; S5. Casting and rolling: The casting and rolling adopts a double-roll inclined casting and rolling mill, the front box temperature is controlled at 695℃±2℃, the casting and rolling speed is 700 mm / min-900mm / min, the cooling water temperature is 25℃-35℃, and the cooling water flow rate of the single-side casting and rolling roll is 110 m 3 / t·Al -130m 3 / t·Al, a cast strip with a thickness of 7.0mm-8.0mm is obtained; S6. Cold rolling: After the temperature of the cast-rolled strip coil obtained in step S5 is lower than 60°C, cold rolling production is started. The cast-rolled strip is cold rolled three times to a finished product thickness of 1.5 mm-2.2 mm. After rolling to the finished product thickness, the edges are trimmed. After trimming, the finished product is annealed. After annealing, the strip is taken out of the furnace and air-cooled to complete the production of 1060 aluminum alloy deep-drawing material.

[0005] Furthermore, the solid material in step S2 is Al99.80 grade remelted aluminum ingot or cast-rolled plate waste of the same alloy.

[0006] Furthermore, in step S5, the length of the casting and rolling zone is 65 mm-75 mm.

[0007] Furthermore, the processing rate of the first pass in the three cold rolling passes recorded in step S6 is controlled at 60%-65%.

[0008] Furthermore, the finished product annealing process recorded in step S6 is to heat the metal from 400°C to 440°C in low-temperature furnace gas to 350-360°C for 4-6 hours, and the final tensile strength is 60 MPa-100 MPa, and the elongation is 30%-60%.

[0009] The beneficial effects are: The present invention selects relatively pure electrolytic aluminum liquid and aluminum ingots, optimizes the alloy element composition, and innovatively adds metal Sr to modify the melt, thereby achieving spheroidization of the AlFeSi secondary phase, improving the grain uniformity of the material, and improving the metallurgical quality of the cast-rolled strip. In addition, the present invention refines the grains of the cast-rolled strip by increasing the rolling processing rate during the casting and rolling process, creating conditions for subsequent production. The present invention also improves the crushing effect of the grain structure and the secondary phase through a large processing rate, adopts an annealing process between recovery and complete recrystallization, and adjusts the basic balance of the internal deformation texture and cubic texture of the material through technical means, improves the deep drawing performance of the material, and controls the earing rate of 1060 deep drawing material within 2%. It is also beneficial to the refinement of grains during recrystallization annealing, solves the problem of coarse surface textures in high deep drawing, and finally achieves the purpose of mass production of 1060 alloy high deep drawing performance aluminum strips by green short-process casting and rolling process. DETAILED DESCRIPTION

[0010] The present invention discloses a process for producing 1060 aluminum alloy deep-drawing material by continuous casting and rolling, comprising the following steps: S1. Screening of electrolytic aluminum liquid: Screen the electrolytic aluminum liquid from the source of aluminum electrolysis, and select the electrolytic aluminum liquid in the electrolytic cell as the raw material. The electrolytic aluminum liquid is required to meet the following conditions: Fe≤0.15%; Si≤0.04%; Na content≤0.007%; S2. Ingredients: According to the charge, the smelting furnace is charged with materials, solid materials are added first, and the solid materials are Al99.80 grade remelted aluminum ingots or cast and rolled plate waste of the same alloy, and then the electrolytic aluminum liquid selected in step S1 is added, and the weight of the solid materials accounts for 30%-35% of the total charge. After all the materials are put into the furnace, the temperature is started to rise, and waste materials below the first level shall not be added; after all the solid materials in the smelting furnace are melted, the composition is adjusted, and the aluminum liquid in the smelting furnace is adjusted to be composed of the following mass percentages: Fe is 0.20%-0.26%; Si is 0.048%-0.06%; Ti is 0.010%-0.020%; Sr is 0.010%-0.012%; other impurities are ≤0.15%; the balance is Al; S3. Furnace refining: S3.1. Refining in the smelting furnace: S3.1.1. When the aluminum liquid temperature reaches 730℃, the first refining begins. The melt refining uses a remelting type particle refining agent with a dosage of 1.0kg / t·Al. Argon is used to evenly load the remelting particle refining agent into the aluminum liquid. The refining covers all areas of the aluminum liquid. The refining time is 25 minutes. After the refining is completed, the slag is allowed to stand and the slag is removed; S3.1.2. After the slag removal is completed, samples are taken to adjust the chemical composition, and the intermediate alloy is added according to the target composition range of each alloy. After the components other than Ti meet the mass percentage composition recorded in step S2, a second refining is performed; S3.1.3. The amount of refining agent used in the second refining is 0.6kg / t·Al, the refining time is 20min, after the refining is completed, the slag is allowed to stand and then the converter is used; S3.1.4. The converter temperature of the aluminum liquid in the smelting furnace is 735℃-750℃. After the temperature and composition of the smelting furnace meet the control requirements, the converter is started. During the converter process, AlTi10 master alloy is added to the converter chute, and the Ti content of the melt is 0.005%-0.008%; S3.2. Static furnace refining: S3.2.1. The aluminum liquid is kept at a temperature of 740℃-750℃ after the melt is transferred from the converter to the static furnace to ensure that the aluminum liquid temperature at the static furnace eye is controlled at 720℃-725℃. Refining begins within 20 minutes after the furnace is poured; S3.2.2. The refining adopts Ar+remelting type granular refining agent, the refining agent dosage is 1.0kg / t·Al, the refining time is 20min, and the slag is removed 30min after refining; S4. Online processing: The melt after completing step S3 is processed online, and the Al-Ti5-B1 ​​grain refiner is preheated and added at the inlet of the degassing box. The temperature of the preheated Al-Ti5-B1 ​​grain refiner before entering the aluminum liquid is not less than 400°C. The amount of Al-Ti5-B1 ​​grain refiner added is 1.8kg / t·Al of the aluminum liquid passing through. The temperature of the melt at the adding point is not less than 715°C, and the final mass percentage of Ti is controlled at 0.010%-0.020%; the aluminum liquid flows out of the degassing box and enters the filter box, and the filter box adopts a 40 mesh + 50 mesh foam ceramic filter plate; S5. Casting and rolling: The casting and rolling adopts a double-roll inclined casting and rolling machine, the casting and rolling zone length is 65mm-75mm, the front box temperature is controlled at 695℃±2℃, the casting and rolling speed is 700 mm / min-900mm / min, the cooling water temperature is 25℃-35℃, and the cooling water flow rate of the single-side casting and rolling roller is 110m 3 / t·Al -130m 3 / t·Al, a cast strip with a thickness of 7.0mm-8.0mm is obtained; S6. Cold rolling: After the temperature of the cast-rolled strip coil obtained in step S5 is lower than 60°C, cold rolling production is started, and the cast-rolled strip is cold-rolled three times to a finished product thickness of 1.5 mm-2.2 mm, and the edges are trimmed after rolling to the finished product thickness, and the finished product is annealed after trimming. After annealing, the product is taken out of the furnace and air-cooled to complete the production of 1060 aluminum alloy deep-drawing material; the processing rate of the first pass in the three-pass cold rolling is controlled at 60%-65%.

[0011] The finished product annealing process is to heat the metal from 400℃-440℃ low-temperature furnace gas to 350-360℃ / 4-6h, with the final tensile strength of 60MPa-100MPa and elongation of 30%-60%.

[0012] The mass percentage of Sr in the aluminum liquid of the present invention is 0.010%-0.012%. By adding Sr to the melt to perform a modification treatment on the melt, the AlFeSi secondary phase is spheroidized, the grain uniformity of the material is improved, and the elongation is increased.

[0013] The solid material in step S2 is Al99.80 grade remelted aluminum ingot or cast-rolled plate waste of the same alloy, and high-quality cold material is used in the batching process to improve the metallurgical quality of the casting and rolling process.

[0014] The processing rate of the first pass in the three cold rolling passes recorded in step S6 and the first pass after annealing is controlled at 60%-65% in order to improve the crushing effect of the grain structure and the secondary phase through a large processing rate, which is beneficial to the refinement of the grains during recrystallization annealing and solves the problem of coarse surface texture in high deep drawing.

[0015] The finished product annealing process of the present invention recorded in step S6 adopts an annealing process between recovery and complete recrystallization to achieve a basic balance between the internal deformation texture and cubic texture of the material, improve the deep drawing performance of the material, and the earing rate is controlled within 2% after testing.

[0016] Embodiment 1: The process of producing 1060 aluminum alloy deep-drawing material by continuous casting and rolling of the present invention is used to produce 1060 aluminum alloy deep-drawing material, and the specific steps are as follows: S1. Screening of electrolytic aluminum liquid: Screen the electrolytic aluminum liquid from the aluminum electrolysis source, and select the electrolytic aluminum liquid in the electrolytic cell as the raw material for double-zero aluminum foil. The electrolytic aluminum liquid is required to meet the following conditions: Fe0.13%, Si0.04%; Na0.005%; S2. Ingredients: According to the charge, the smelting furnace is charged with materials, solid materials are added first, and then the electrolytic aluminum liquid selected in step S1 is added, the weight of the solid materials accounts for 30% of the total charge, and the temperature is raised after all the materials are put into the furnace, and waste materials below the first level shall not be added; after all the solid materials in the smelting furnace are melted, the composition is adjusted, and the aluminum liquid in the smelting furnace is adjusted to the following mass percentage components: Fe 0.23%; Si 0.048%; Ti 0.010%; Sr 0.010%; other impurities 0.10%; the balance is Al; S3. Furnace refining: S3.1. Refining in the smelting furnace: S3.1.1. When the aluminum liquid temperature reaches 730℃, the first refining begins. The melt refining uses a remelting type particle refining agent with a dosage of 1.0kg / t·Al. Argon is used to evenly load the remelting particle refining agent into the aluminum liquid. The refining covers all areas of the aluminum liquid. The refining time is 25 minutes. After the refining is completed, the slag is allowed to stand and the slag is removed; S3.1.2. After the slag removal is completed, sample and adjust the chemical composition, add the intermediate alloy according to the target composition range of each alloy, and perform the second refining after the components other than Ti meet the composition of step S2; S3.1.3. The amount of refining agent used in the second refining is 0.6kg / t·Al, the refining time is 20min, after the refining is completed, the slag is allowed to stand and then the converter is used; S3.1.4. The converter temperature of the aluminum liquid in the smelting furnace is 736°C. After the temperature and composition of the smelting furnace meet the control requirements, the converter is started. During the converter process, AlTi10 master alloy is added to the converter chute, and the Ti content of the melt is 0.006%; S3.2. Static furnace refining: S3.2.1. The aluminum liquid is kept at 740℃ after the melt is transferred from the converter to the static furnace to ensure that the aluminum liquid temperature at the static furnace eye is controlled at 721℃. Refining begins within 20 minutes after the furnace is poured; S3.2.2. The refining adopts Ar+remelting type granular refining agent, the refining agent dosage is 1.0kg / t·Al, the refining time is 20min, and the slag is removed 30min after refining; S4. Online processing: The melt after completing step S3 is processed online. The Al-Ti5-B1 ​​grain refiner is preheated and added at the inlet of the degassing box. The temperature of the preheated Al-Ti5-B1 ​​grain refiner before entering the aluminum liquid is 400°C. The amount added is 1.8kg / t·Al of the aluminum liquid passing through. The temperature of the melt at the adding point is 715°C, and the final mass percentage of Ti is controlled at 0.011%. After the aluminum liquid flows out of the degassing box, it enters the filter box, and a 40+50 mesh foam ceramic filter plate is used for filtration. S5. Casting and rolling: The casting and rolling adopts a double-roll inclined casting and rolling machine, the casting and rolling zone length is 65mm, the front box temperature is controlled at 697℃, the casting and rolling speed is 900mm / min, the cooling water temperature is 25℃, and the cooling water flow rate of the single-side casting and rolling roller is 110m 3 / t·Al, a cast strip with a thickness of 7.0 mm is obtained; S6. Cold rolling: After the temperature of the cast-rolled strip coil obtained in step S5 is lower than 60°C, cold rolling production is started. The cast-rolled strip is cold rolled in three passes to a finished product thickness of 1.5 mm, wherein the processing rate of the first pass and the first pass after annealing is controlled at 60%. After rolling to the finished product thickness, the edges are trimmed, and then the finished product is annealed. The finished product annealing process is 350°C / 4h. After annealing, the strip is taken out of the furnace and air-cooled to complete the production of 1060 alloy deep-drawing material, with a final tensile strength of 90MPa and an elongation of 30%.

[0017] Embodiment 2: The process of producing 1060 aluminum alloy deep-drawing material by continuous casting and rolling of the present invention is used to produce 1060 aluminum alloy deep-drawing material, and the specific steps are as follows: S1. Screening of electrolytic aluminum liquid: The electrolytic aluminum liquid is screened from the source of aluminum electrolysis, and the electrolytic aluminum liquid in the electrolytic cell is selected as the raw material of double-zero aluminum foil. The impurity content in the electrolytic aluminum liquid is Fe0.15%; Si0.04%; Na0.007%; S2. Ingredients: The materials are added to the smelting furnace according to the charge, solid materials are added first, and then the electrolytic aluminum liquid selected in step S1 is added, the weight of the solid materials accounts for 33% of the total charge of the materials, and the temperature is raised after all the materials are put into the furnace, and waste materials below the first level shall not be added; after all the solid materials in the smelting furnace are melted, the composition is adjusted, and the aluminum liquid in the smelting furnace is adjusted to the following mass percentage components: Fe 0.24%; Si 0.052%; Ti 0.015%; Sr 0.011%; other impurities total 0.12%; the balance is Al; S3. Furnace refining: S3.1. Refining in the smelting furnace: S3.1.1. When the aluminum liquid temperature reaches 730℃, the first refining begins. The melt refining uses a remelting type particle refining agent with a dosage of 1.0kg / t·Al. Argon is used to evenly load the remelting particle refining agent into the aluminum liquid. The refining covers all areas of the aluminum liquid. The refining time is 25 minutes. After the refining is completed, the slag is allowed to stand and the slag is removed; S3.1.2. After the slag removal is completed, sample and adjust the chemical composition, add the intermediate alloy according to the target composition range of each alloy, and perform the second refining after the components other than Ti meet the composition of step S2; S3.1.3. The amount of refining agent used in the second refining is 0.6kg / t·Al, the refining time is 20min, after the refining is completed, the slag is allowed to stand and then the converter is used; S3.1.4. The converter temperature of the aluminum liquid in the smelting furnace is 742°C. After the temperature and composition of the smelting furnace meet the control requirements, the converter is started. During the converter process, AlTi10 master alloy is added to the converter chute, and the Ti content of the melt is 0.007%; S3.2. Static furnace refining: S3.2.1. The aluminum liquid is kept at 746℃ after the melt is transferred from the converter to the static furnace to ensure that the aluminum liquid temperature at the static furnace eye is controlled at 723℃. Refining begins within 20 minutes after the furnace is poured; S3.2.2. The refining adopts Ar+remelting type granular refining agent, the refining agent dosage is 1.0kg / t·Al, the refining time is 20min, and the slag is removed 30min after refining; S4. Online processing: The melt after completing step S3 is processed online. The Al-Ti5-B1 ​​grain refiner is preheated and added at the inlet of the degassing box. The temperature of the preheated Al-Ti5-B1 ​​grain refiner before entering the aluminum liquid is 422°C. The amount added is 1.8kg / t·Al of the aluminum liquid passing through. The temperature of the melt at the adding point is 724°C, and the final mass percentage of Ti is controlled at 0.016%. After the aluminum liquid flows out of the degassing box, it enters the filter box, and the filtration adopts a 40+50 mesh foam ceramic filter plate; S5. Casting and rolling: The casting and rolling adopts a double-roll inclined casting and rolling machine, the casting and rolling zone length is 70mm, the front box temperature is controlled at 695℃, the casting and rolling speed is 810mm / min, the cooling water temperature is 30℃, and the cooling water flow rate of the single-side casting and rolling roller is 120m 3 / t·Al, a cast strip with a thickness of 7.5 mm was obtained; S6. Cold rolling: After the temperature of the cast-rolled strip coil obtained in step S5 is lower than 60°C, cold rolling production is started. The cast-rolled strip is cold rolled in three passes to a finished product thickness of 1.8 mm, wherein the processing rate of the first pass and the first pass after annealing is controlled at 62%. After rolling to the finished product thickness, the edges are trimmed, and then the finished product is annealed. The finished product annealing process is 354°C / 5h. After annealing, the strip is taken out of the furnace and air-cooled to complete the production of 1060 alloy deep-drawing material, with a final tensile strength of 82MPa and an elongation of 49%.

[0018] Embodiment 3: The process of producing 1060 aluminum alloy deep-drawing material by continuous casting and rolling of the present invention is used to produce 1060 aluminum alloy deep-drawing material, and the specific steps are as follows: S1. Screening of electrolytic aluminum liquid: The electrolytic aluminum liquid is screened from the source of aluminum electrolysis, and the electrolytic aluminum liquid in the electrolytic cell is selected as the raw material of double-zero aluminum foil. The impurity content in the electrolytic aluminum liquid is Fe0.16%; Si0.04%; Na0.001%; S2. Ingredients: According to the charge, the smelting furnace is charged with materials, solid materials are added first, and then the electrolytic aluminum liquid selected in step S1 is added, the weight of the solid materials accounts for 35% of the total charge, and the temperature is raised after all the materials are put into the furnace, and waste materials below the first level shall not be added; after all the solid materials in the smelting furnace are melted, the composition is adjusted, and the aluminum liquid in the smelting furnace is adjusted to the following mass percentage components: Fe 0.26%; Si 0.060%; Ti 0.020%; Sr 0.012%; other impurities ≤ 0.10%; the balance is Al; S3. Furnace refining: S3.1. Refining in the smelting furnace: S3.1.1. When the aluminum liquid temperature reaches 730℃, the first refining begins. The melt refining uses a remelting type particle refining agent with a dosage of 1.0kg / t·Al. Argon is used to evenly load the remelting particle refining agent into the aluminum liquid. The refining covers all areas of the aluminum liquid. The refining time is 25 minutes. After the refining is completed, the slag is allowed to stand and the slag is removed; S3.1.2. After the slag removal is completed, sample and adjust the chemical composition, add the intermediate alloy according to the target composition range of each alloy, and perform the second refining after the components other than Ti meet the composition of step S2; S3.1.3. The amount of refining agent used in the second refining is 0.6kg / t·Al, the refining time is 20min, after the refining is completed, the slag is allowed to stand and then the converter is used; S3.1.4. The converter temperature of the aluminum liquid in the smelting furnace is 750°C. After the temperature and composition of the smelting furnace meet the control requirements, the converter is started. During the converter process, AlTi10 master alloy is added to the converter chute, and the Ti content of the melt is 0.008%; S3.2. Static furnace refining: S3.2.1. The aluminum liquid is kept at 750℃ after the melt is transferred from the converter to the static furnace to ensure that the aluminum liquid temperature at the static furnace eye is controlled at 725℃. Refining begins within 20 minutes after the furnace is poured; S3.2.2. The refining adopts Ar+remelting type granular refining agent, the refining agent dosage is 1.0kg / t·Al, the refining time is 20min, and the slag is removed 30min after refining; S4. Online processing: The melt after completing step S3 is processed online. The Al-Ti5-B1 ​​grain refiner is preheated and added at the inlet of the degassing box. The temperature of the preheated Al-Ti5-B1 ​​grain refiner before entering the aluminum liquid is 417°C. The amount added is 1.8kg / t·Al of the aluminum liquid passing through. The temperature of the melt at the adding point is 725°C, and the final mass percentage of Ti is controlled at 0.020%. After the aluminum liquid flows out of the degassing box, it enters the filter box, and a 40+50 mesh foam ceramic filter plate is used for filtration. S5. Casting and rolling: The casting and rolling adopts a double-roll inclined casting and rolling machine, the casting and rolling zone length is 75mm, the front box temperature is controlled at 697℃, the casting and rolling speed is 900mm / min, the cooling water temperature is 35℃, and the cooling water flow rate of the single-side casting and rolling roller is 130m 3 / t·Al, a cast strip with a thickness of 8.0 mm is obtained; S6. Cold rolling: After the temperature of the cast-rolled strip coil obtained in step S5 is lower than 60°C, cold rolling production is started. The cast-rolled strip is cold rolled in three passes to a finished product thickness of 2.2 mm, wherein the processing rate of the first pass and the first pass after annealing is controlled at 65%. After rolling to the finished product thickness, the edges are trimmed, and then the finished product is annealed. The finished product annealing process is 360°C / 6h. After annealing, the strip is taken out of the furnace and air-cooled to complete the production of 1060 alloy deep-drawing material, with a final tensile strength of 60MPa and an elongation of 60%.

[0019] The present invention performs a modification treatment on the melt by innovatively adding metal Sr, thereby achieving a spheroidization treatment on the secondary phase of AlFeSi, improving the grain uniformity of the material, and improving the metallurgical quality of the cast-rolled strip. Secondly, the present invention verifies through three embodiments that the means of increasing the length of the casting and rolling zone and the thickness of the cast-rolled billet are adopted. On the one hand, the "hot rolling" rolling processing rate in the casting and rolling process is increased, and the grains of the cast-rolled strip are refined, creating conditions for subsequent production; on the other hand, through Examples 2 and 3, it is verified that the cold rolling processing rate is increased by increasing the thickness of the cast-rolled billet to improve the crushing effect of the grain structure and the secondary phase; at the same time, an annealing process between recovery and complete recrystallization is adopted, and the internal deformation texture and cubic texture of the material are adjusted by technical means to basically balance, improve the deep drawing performance of the material, and control the earing rate of the 1060 deep drawing material within 2%. At the same time, it is also beneficial to the refinement of the grains during recrystallization annealing, solve the problem of coarse surface textures in high deep drawing, and finally achieve the purpose of mass production of 1060 alloy high deep drawing performance aluminum strips by green short-process casting and rolling process.

Claims

1. A process for producing 1060 aluminum alloy deep-drawing material by continuous casting and rolling, characterized in that: The steps include: S1. Screening of electrolytic aluminum liquid: The electrolytic aluminum liquid in the electrolytic cell is selected as the raw material. The electrolytic aluminum liquid is required to meet the following conditions: Fe≤0.15%; Si≤0.04%; Na content≤0.007%; S2. Ingredients: The materials are added to the smelting furnace according to the charge, solid materials are added first, and then the electrolytic aluminum liquid selected in step S1 is added, the weight of the solid materials accounts for 30%-35% of the total charge of the materials, and the temperature is raised after all the materials are put into the furnace, and waste materials below the first level shall not be added; after all the solid materials in the smelting furnace are melted, the composition is adjusted, and the aluminum liquid in the smelting furnace is adjusted to be composed of the following mass percentages: Fe is 0.20%-0.26%; Si is 0.048%-0.06%; Ti is 0.010%-0.020%; Sr is 0.010%-0.012%; other impurities are ≤0.15%; the balance is Al; S3. Furnace refining: S3.

1. Refining in the smelting furnace: S3.1.

1. When the aluminum liquid temperature reaches 730℃, the first refining begins. The melt refining uses a remelting type particle refining agent with a dosage of 1.0kg / t·Al. Argon is used to evenly load the remelting particle refining agent into the aluminum liquid. The refining covers all areas of the aluminum liquid. The refining time is 25 minutes. After the refining is completed, the slag is allowed to stand and the slag is removed; S3.1.

2. After the slag removal is completed, samples are taken to adjust the chemical composition, and the intermediate alloy is added according to the target composition range of each alloy. After the components other than Ti meet the mass percentage composition recorded in step S2, a second refining is performed; S3.1.

3. The amount of refining agent used in the second refining is 0.6kg / t·Al, the refining time is 20min, after the refining is completed, the slag is allowed to stand and then the converter is used; S3.1.

4. The converter temperature of the aluminum liquid in the smelting furnace is 735℃-750℃. After the temperature and composition of the smelting furnace meet the control requirements, the converter is started. During the converter process, AlTi10 master alloy is added to the converter chute, and the Ti content of the melt is 0.005%-0.008%; S3.

2. Static furnace refining: S3.2.

1. The aluminum liquid is kept at a temperature of 740℃-750℃ after the melt is transferred from the converter to the static furnace to ensure that the aluminum liquid temperature at the static furnace eye is controlled at 720℃-725℃. Refining begins within 20 minutes after the furnace is poured; S3.2.

2. The refining adopts Ar+remelting type granular refining agent, the refining agent dosage is 1.0kg / t·Al, the refining time is 20min, and the slag is removed 30min after refining; S4. Online processing: The melt after completing step S3 is processed online, and the Al-Ti5-B1 ​​grain refiner is preheated and added at the inlet of the degassing box. The temperature of the preheated Al-Ti5-B1 ​​grain refiner before entering the aluminum liquid is not less than 400°C. The amount of Al-Ti5-B1 ​​grain refiner added is 1.8kg / t·Al of the aluminum liquid passing through. The temperature of the melt at the adding point is not less than 715°C, and the final mass percentage of Ti is controlled at 0.010%-0.020%; the aluminum liquid flows out of the degassing box and enters the filter box, and the filter box adopts a 40 mesh + 50 mesh foam ceramic filter plate; S5. Casting and rolling: The casting and rolling adopts a double-roll inclined casting and rolling mill, the front box temperature is controlled at 695℃±2℃, the casting and rolling speed is 700 mm / min-900mm / min, the cooling water temperature is 25℃-35℃, and the cooling water flow rate of the single-side casting and rolling roll is 110 m 3 / t·Al -130m 3 / t·Al, a cast strip with a thickness of 7.0mm-8.0mm is obtained; S6. Cold rolling: After the temperature of the cast-rolled strip coil obtained in step S5 is lower than 60°C, cold rolling production is started. The cast-rolled strip is cold rolled three times to a finished product thickness of 1.5 mm-2.2 mm. After rolling to the finished product thickness, the edges are trimmed. After trimming, the finished product is annealed. After annealing, the strip is taken out of the furnace and air-cooled to complete the production of 1060 aluminum alloy deep-drawing material.

2. The process for producing 1060 aluminum alloy deep-drawing material by continuous casting and rolling according to claim 1, characterized in that: The solid material in step S2 is Al99.80 grade remelted aluminum ingot or cast-rolled plate waste of the same alloy.

3. The process for producing 1060 aluminum alloy deep-drawing material by continuous casting and rolling according to claim 1, characterized in that: In step S5, the length of the casting and rolling zone is 65 mm-75 mm.

4. The process for producing 1060 aluminum alloy deep-drawing material by continuous casting and rolling according to claim 1, characterized in that: The processing rate of the first pass in the three cold rolling passes recorded in step S6 is controlled at 60%-65%.

5. The process for producing 1060 aluminum alloy deep-drawing material by continuous casting and rolling according to claim 1, characterized in that: The finished product annealing process recorded in step S6 is to heat the metal to 350-360°C / 4-6h in a low temperature furnace gas at 400°C-440°C, and the final tensile strength is 60 MPa-100MPa, and the elongation is 30%-60%.