CN112831692A - Aluminum-manganese alloy strip and preparation method thereof - Google Patents
Aluminum-manganese alloy strip and preparation method thereof Download PDFInfo
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Abstract
The invention discloses an aluminum-manganese alloy strip and a preparation method thereof, wherein the aluminum-manganese alloy strip comprises 98.00-98.30% of Al, less than or equal to 0.60% of Si, less than or equal to 0.70% of Fe, less than or equal to 0.05% of Cu, less than or equal to 0.02% of Mg, 1.0-1.5% of Mn, less than or equal to 0.10% of Zn, 0.01-0.03% of Ti and the balance of inevitable impurities, wherein the ratio of the mass of Fe to the mass of Si is 3.1-3.2; the casting process adopts a semi-continuous casting method to prepare the cast ingot. Compared with the prior art, the aluminum-manganese alloy strip prepared by the method has excellent comprehensive mechanical properties, good stamping forming performance and tensile strength of 170-180 MPa, can be applied to a capacitor shell, and solves the problems of serious segregation of internal structures, uneven and thick local crystal grains and high earing rate in the prior art.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the field of preparation of aluminum and aluminum alloy strips, in particular to a preparation method of an aluminum-manganese alloy strip.
[ background of the invention ]
With the change of electronic information technology, the technology of digital products is more and more updated, and one of the elements that the digital products can not be separated from is a capacitor, and because the aluminum manganese alloy has the outstanding advantages of light weight, high strength, corrosion resistance and the like, the application of aluminum manganese alloy materials in the capacitor industry is gradually increased.
In the preparation method of the aluminum-manganese alloy strip in the related technology, the steps of smelting, casting, homogenizing, rolling, annealing and the like are usually included, but when the casting and rolling method is used for producing the pure aluminum strip, the mechanical performance problems of serious segregation of chemical components and internal tissues, local uneven and coarse grains, high earing rate and the like exist, and the surface defects of orange peel, roughness, pine-tree-shaped patterns, blackened surface and the like exist; when the pure aluminum strip is produced by a hot rolling method, the tensile strength is only 100-110 MPa, the strength is low, the explosion-proof pressure is unstable, and the like, so that the problems not only can cause the leakage accident of the capacitor, but also can cause the explosion of the capacitor and damage the safety.
Therefore, there is a need to provide a new method for preparing an aluminum manganese alloy strip to solve the above problems.
[ summary of the invention ]
The invention aims to provide an aluminum-manganese alloy strip with excellent corrosion resistance and high tensile strength and a preparation method thereof.
In order to achieve the above object, the present invention provides a method for preparing an aluminum-manganese alloy strip, which comprises the following steps:
step S1, the components and the mass percentage are as follows: 98.00-98.30% of Al, less than or equal to 0.60% of Si, less than or equal to 0.70% of Fe, less than or equal to 0.05% of Cu, less than or equal to 0.02% of Mg, 1.0-1.5% of Mn, less than or equal to 0.10% of Zn, 0.01-0.03% of Ti and the balance of inevitable impurities, wherein the ratio of the mass of Fe to the mass of Si is 3.1-3.2; the casting process adopts a semi-continuous casting method to prepare the cast ingot, and specifically comprises the following steps:
step S11, preparing materials, wherein the proportion of the primary waste solid cold materials is 25-30%, the rest of the solid cold materials are remelted aluminum ingots with the contents of Cu, Mg, Zn and Al meeting the mass percentage are selected as melts and smelted into aluminum liquid, the temperature of the smelted aluminum liquid is not more than 750 ℃, and after the temperature of the melts reaches 730-750 ℃, the elements Fe, Si and Mn are added according to the mass percentage;
s12, refining the aluminum liquid in a smelting furnace, wherein 20-30 Kg of granular refining agent and argon are added into the smelting furnace for refining for 20-30 minutes, and the ratio of the mass of the refining agent with the granularity distribution of 0.85-3.15 mm to the total mass of the granular refining agent is greater than or equal to 96%;
s13, transferring the aluminum liquid treated in the step S12 into a heat preservation furnace for secondary refining, and refining for 25-35 minutes by using chlorine;
step S14, slagging off the aluminum liquid after the secondary refining is finished, and standing for 30-40 minutes;
s15, degassing the aluminum liquid after standing in a degassing box in sequence, wherein the hydrogen content in the degassing box is less than 0.12mL/100gAl, and in the whole degassing process of the degassing box, adding a titanium wire AlTi5B0.2A on line according to the mass percent of the Ti element for grain refinement; the degassed aluminum liquid passes through a filter box, and the filter box performs two-stage filtration; casting the filtered molten aluminum through a crystallizer to obtain the ingot, wherein the casting speed is 42-52 mm/min, and the flow rate of casting cooling water is 220-320L/min;
step S2, preparing the cast ingot into a hot-rolled blank with the thickness of 4.0mm by adopting a hot-rolling procedure:
step S21, milling the cast ingot, milling each 10mm large surface, and milling the cold shut;
step S22, carrying out homogenization treatment on the cast ingot after surface milling, determining the homogenization process temperature to be 605 +/-5 ℃ by adopting differential thermal analysis, and carrying out heat preservation for 7 hours; after homogenization treatment, continuously preserving heat for 2 hours and then discharging from the furnace for rolling, wherein in the period of 2 hours of heat preservation, the ingot casting temperature is 515-525 ℃;
step S23, rolling the ingot after the homogenization treatment by a hot continuous rolling mill, wherein the hot rolling and the rough rolling are carried out for 21 times, the thickness of the intermediate billet after the rough rolling is 28mm, and then, carrying out the finish rolling by a 3-stand to obtain a hot rolled blank with the thickness of 4.0mm, wherein the finish rolling temperature is 320-330 ℃;
step S3, cold rolling the hot rolled blank to obtain an aluminum-manganese alloy strip with the thickness of 0.3 mm:
step S31, cold rolling the hot rolled blank, and finally obtaining an aluminum coil with the thickness of 0.3mm through 4 times of rolling, wherein the rolling speed is kept at 800-1000 m/min;
step S32, washing the aluminum coil with alkali liquor in sequence to remove rolling oil, aluminum powder and iron powder falling off from the roller;
and step S33, carrying out low-temperature annealing treatment on the cleaned aluminum coil in an annealing furnace to obtain the aluminum-manganese alloy strip with the thickness of 0.3mm, wherein the annealing temperature is 260 ℃ and the temperature is kept for 10 hours.
Preferably, in step S11, master alloys are used for the preparation elements Fe, Si, and Mn.
Preferably, in step S15, the dual-stage filtration employs a 40PPi +60PPi ceramic filter plate combined filter structure.
Preferably, in the step S23, the hot rolled blank rolled by the finish rolling 3 stand to form 4.0mm is sequentially subjected to rolling passes of 28mm, 14mm, 8.0mm and 4.0 mm.
Preferably, in step S23, the hot rolled billet is forcibly and rapidly cooled by a fan after being discharged.
Preferably, in the step S31, the aluminum coil having a final thickness of 0.3mm is formed by performing rolling passes of 4.0mm, 1.8mm, 0.85mm, 0.45mm, and 0.3mm in this order.
Preferably, in the step S31, the temperature of the aluminum coil is maintained between 140 ℃ and 150 ℃ when the aluminum coil is off-machine.
Preferably, the aluminum manganese alloy strip is prepared by the method for preparing the aluminum manganese alloy strip of any one of claims 1 to 7, and the aluminum manganese alloy strip is used for capacitor shells.
Compared with the prior art, the preparation method of the aluminum-manganese alloy strip has the advantages that through excellent chemical component design, particularly control of the ratio of the Fe quality to the Si quality, matching of casting process parameters, ingot casting homogenization process system and the like, the tensile strength of the obtained aluminum-manganese alloy strip can reach 170-180 MPa, crystal grains are fine, anisotropy is good, 8 lugs of 0 degree, 90 degrees and 45 degrees are formed, and the lug making rate is below 0.4%; by controlling the cooling mode of the hot rolled blank and the aluminum coil, the aluminum-manganese alloy strip has excellent comprehensive mechanical properties and good stamping forming performance; adopts an excellent melt refining process to ensure that the content of melt slag is only 0.012mm2The aluminum manganese alloy strip has high strength and uniformly dispersed second phase distribution, so that the potential difference is extremely small.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:
FIG. 1 is a flow chart of the method for preparing the aluminum-manganese alloy strip.
[ detailed description ] embodiments
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the present invention provides a method for preparing an aluminum-manganese alloy strip, which specifically includes the following steps:
step S1, the components and the mass percentage are as follows: 98.00-98.30% of Al, less than or equal to 0.60% of Si, less than or equal to 0.70% of Fe, less than or equal to 0.05% of Cu, less than or equal to 0.02% of Mg, 1.0-1.5% of Mn, less than or equal to 0.10% of Zn, 0.01-0.03% of Ti and the balance of inevitable impurities, wherein the ratio of the mass of Fe to the mass of Si is 3.1-3.2; the casting process adopts a semi-continuous casting method to prepare the cast ingot.
Wherein, the ratio of the mass of Fe to the mass of Si is controlled to be 3.1-3.2, so that the formation of a large amount of hard brittle phase beta-phase Fe Si Al can be effectively avoided3The purpose that the aluminum-manganese alloy strip has high tensile strength is achieved.
Step S1 specifically includes:
step S11, preparing materials, wherein the proportion of the primary waste solid cold materials is 25-30%, the rest of the solid cold materials are remelted aluminum ingots with the contents of Cu, Mg, Zn and Al meeting the mass percentage are selected as melts and smelted into aluminum liquid, the temperature of the smelted aluminum liquid is not more than 750 ℃, and after the temperature of the melts reaches 730-750 ℃, the elements Fe, Si and Mn are added according to the mass percentage; specifically, the preparation elements Fe, Si and Mn adopt intermediate alloys, and other alloys are not added in a preparation way.
Specifically, the primary waste solid cold material is ingot saw cutting head and tail waste, the structure defect that the crystal grains of the original ingot of the aluminum-manganese alloy are thick can be fully reduced according to the batching requirement, and the subsequent processing performance is ensured. Wherein the primary waste solid cold material conforms to the waste classification specified in YS/T1004-2004.
In this embodiment, the configuration element Fe is AlFe20, Si is AlSi20, and Mn is AlMn 25.
And S12, refining the aluminum liquid in a smelting furnace, wherein 20-30 Kg of granular refining agent and argon are added into the smelting furnace for refining for 20-30 minutes, and the ratio of the mass of the refining agent with the granularity distribution of 0.85-3.15 mm to the total mass of the granular refining agent is greater than or equal to 96%.
And S13, transferring the aluminum liquid treated in the step S12 into a heat preservation furnace for secondary refining, and refining for 25-35 minutes by using chlorine.
In the embodiment, the molten aluminum refining process adopts a mode of combining a smelting furnace refining method and a holding furnace two-time refining process, so that a pure melt can be obtained, and the melt has no corrosive slag inclusion source. Specifically, the content of the melt slag is 0.012mm2The aluminum manganese alloy strip has high strength and uniformly dispersed second phase distribution, so that the potential difference is extremely small.
And S14, slagging off the aluminum liquid after the secondary refining is finished, and standing for 30-40 minutes.
S15, degassing the aluminum liquid after standing in a degassing box in sequence, wherein the hydrogen content in the degassing box is less than 0.12mL/100gAl, and in the whole degassing process of the degassing box, adding a titanium wire AlTi5B0.2A on line according to the mass percent of the Ti element for grain refinement; the degassed aluminum liquid passes through a filter box, and the filter box performs two-stage filtration; specifically, the double-stage filtration adopts a 40PPi +60PPi ceramic filter plate combined filtration structure. And casting the filtered aluminum liquid through a crystallizer to obtain the ingot, wherein the casting speed is 42-52 mm/min, and the flow rate of casting cooling water is 220-320L/min.
In this embodiment, the ingot produced by matching the casting process parameters in step S1 has fine and uniform original crystal grains and no serious undesirable defects such as structure segregation.
Step S2, preparing the cast ingot into a hot-rolled blank with the thickness of 4.0mm by adopting a hot-rolling procedure:
and step S21, milling the cast ingot, milling each surface with the large surface of 10mm, and milling the cold shut.
Step S22, carrying out homogenization treatment on the cast ingot after surface milling, determining the homogenization process temperature to be 605 +/-5 ℃ by adopting differential thermal analysis, and carrying out heat preservation for 7 hours; and after homogenization treatment, continuously preserving heat for 2 hours and then discharging from the furnace for rolling, wherein the ingot casting temperature is 515-525 ℃ in the period of 2 hours of heat preservation.
The homogenization treatment in this embodiment can eliminate dendrite segregation of ingot and needle-like FeAl3The phase is obviously reduced, and simultaneously a large amount of short rod-shaped (Fe, Mn) Al is formed6Phase, and a large amount of granular (Fe, Mn) SiAl phase and short rod-shaped MnAl are precipitated between the grains6The dispersed second phase avoids the uneven growth of the crystal grains in the subsequent heat treatment; the crystal grains are fine and uniform, the punched surface of the strip cannot form orange peel, slip lines and other defects, the earing rate is small, the potential difference between phases is extremely small, and a micro battery cannot be formed, so the use safety performance of the capacitor is greatly improved.
And S23, rolling the ingot after the homogenization treatment by a hot continuous rolling mill, wherein the hot continuous rolling mill is a 1+3 hot continuous rolling mill. Wherein the hot rolling and the rough rolling are carried out for 21 times, the thickness of the intermediate blank after the rough rolling is 28mm, the finish rolling is carried out by a 3-frame rolling machine to obtain a hot rolling blank with the thickness of 3.0mm, the finish rolling temperature is 320-330 ℃, and the finish rolling temperature can ensure that the hot rolling blank is fully recrystallized.
Specifically, the hot rolled blank rolled by the finish rolling 3 stand to form 4.0mm needs to be subjected to rolling passes of 28mm, 14mm, 8.0mm and 4.0mm in sequence, and after the hot rolled blank is discharged, forced rapid cooling is carried out by using a fan, and optimally, 4 fans are arranged. Wherein, the forced rapid cooling is not easy to cause the crystal grains of the aluminum-manganese alloy to grow, is beneficial to the fine crystal grains of the final product and has excellent stamping performance.
Step S3, cold rolling the hot rolled blank to obtain an aluminum-manganese alloy strip with the thickness of 0.3 mm:
and step S31, cold rolling the hot rolled blank, and finally obtaining an aluminum coil with the thickness of 0.3mm through 4 times of rolling, wherein the rolling speed is kept at 800-1000 m/min.
Specifically, during cold rolling, the aluminum coils with the final thickness of 0.3mm are formed to be 4.0mm, 1.8mm, 0.85mm, 0.45mm and 0.3mm through rolling passes in sequence, the temperature of the aluminum coils is kept between 140 ℃ and 150 ℃ when the aluminum coils are taken off the rolling mill, then the aluminum coils are cooled in a natural cooling mode, and the dynamic recovery has a better effect compared with the dynamic recovery of simple heat treatment when the aluminum coils are in the natural cooling, so that the ear making in the 45-degree direction of the balanced rolling deformation is facilitated, and the ear making rate of finished strips is low.
Step S32, washing the aluminum coil with alkali liquor in sequence to remove rolling oil, aluminum powder and iron powder falling off from the roller; the cleaned surface of the aluminum coil has no quality defects of blacking, indentation, pocking marks and the like after the capacitor shell is punched.
And step S33, carrying out low-temperature annealing treatment on the cleaned aluminum coil in an annealing furnace to obtain the aluminum-manganese alloy strip with the thickness of 0.3mm, wherein the annealing temperature is 260 ℃ and the temperature is kept for 10 hours. The annealing production process can avoid the problem of uneven growth of crystal grains caused by uneven temperature rise of the inner ring and the outer ring of the aluminum coil during heat treatment, and the aluminum-manganese alloy strip obtained after heat treatment has fine and even crystal grains and low earing rate and meets the punching requirement.
In this embodiment, the aluminum-manganese alloy strip prepared by the preparation method of the aluminum-manganese alloy strip can be used as a capacitor shell after further stamping. Experimental data show that the aluminum-manganese alloy strip prepared by the preparation method has the thickness of 0.3mm, the tensile strength of 170-180 MPa, fine crystal grains, good anisotropy and shapeThe ear making rate is below 0.4 percent when 8 ear making are carried out at 0 degree, 90 degrees and 45 degrees; the low slag content of the melt makes the melt meet the condition of extremely small potential difference, specifically, the slag content of the melt is 0.012mm2Therefore, the material meets the requirement that the capacitor shell is not easy to break down, and the material is used as the capacitor shell, so that the problems of serious segregation of chemical components and internal structures, uneven and thick local crystal grains, high earing rate and other mechanical properties in the prior art are solved.
Specifically, the finished product of the aluminum-manganese alloy strip prepared by the preparation method of the aluminum-manganese alloy strip has the thickness of 0.3mm, excellent comprehensive mechanical properties, tensile strength of 178MPa, good anisotropy, and a earing rate of 0.34%, and is excellent in stamping performance, free of wrinkling, warping and cracking during stamping, and bright in surface of a stamped shell.
Compared with the prior art, the preparation method of the aluminum-manganese alloy strip has the advantages that through excellent chemical component design, particularly control of the ratio of the Fe quality to the Si quality, matching of casting process parameters, ingot casting homogenization process system and the like, the tensile strength of the obtained aluminum-manganese alloy strip can reach 170-180 MPa, crystal grains are fine, anisotropy is good, 8 lugs of 0 degree, 90 degrees and 45 degrees are formed, and the lug making rate is below 0.4%; by controlling the cooling mode of the hot rolled blank and the aluminum coil, the aluminum-manganese alloy strip has excellent comprehensive mechanical properties and good stamping forming performance; adopts an excellent melt refining process to ensure that the content of melt slag is only 0.012mm2The aluminum manganese alloy strip has high strength and uniformly dispersed second phase distribution, so that the potential difference is extremely small.
The present invention provides an embodiment of the present invention, which is not limited to the scope of the present invention, and all equivalent structures or equivalent flow transformations made by using the contents of the specification and the drawings, or applied directly or indirectly to other related technical fields, are included in the scope of the present invention.
Claims (8)
1. The preparation method of the aluminum-manganese alloy strip is characterized by comprising the following steps of:
step S1, the components and the mass percentage are as follows: 98.00-98.30% of Al, less than or equal to 0.60% of Si, less than or equal to 0.70% of Fe, less than or equal to 0.05% of Cu, less than or equal to 0.02% of Mg, 1.0-1.5% of Mn, less than or equal to 0.10% of Zn, 0.01-0.03% of Ti and the balance of inevitable impurities, wherein the ratio of the mass of Fe to the mass of Si is 3.1-3.2; the casting process adopts a semi-continuous casting method to prepare the cast ingot, and specifically comprises the following steps:
step S11, preparing materials, wherein the proportion of the primary waste solid cold materials is 25-30%, the rest of the solid cold materials are remelted aluminum ingots with the contents of Cu, Mg, Zn and Al meeting the mass percentage are selected as melts and smelted into aluminum liquid, the temperature of the smelted aluminum liquid is not more than 750 ℃, and after the temperature of the melts reaches 730-750 ℃, the elements Fe, Si and Mn are added according to the mass percentage;
s12, refining the aluminum liquid in a smelting furnace, wherein 20-30 Kg of granular refining agent and argon are added into the smelting furnace for refining for 20-30 minutes, and the ratio of the mass of the refining agent with the granularity distribution of 0.85-3.15 mm to the total mass of the granular refining agent is greater than or equal to 96%;
s13, transferring the aluminum liquid treated in the step S12 into a heat preservation furnace for secondary refining, and refining for 25-35 minutes by using chlorine;
step S14, slagging off the aluminum liquid after the secondary refining is finished, and standing for 30-40 minutes;
s15, degassing the aluminum liquid after standing in a degassing box in sequence, wherein the hydrogen content in the degassing box is less than 0.12mL/100gAl, and in the whole degassing process of the degassing box, adding a titanium wire AlTi5B0.2A on line according to the mass percent of the Ti element for grain refinement; the degassed aluminum liquid passes through a filter box, and the filter box performs two-stage filtration; casting the filtered molten aluminum through a crystallizer to obtain the ingot, wherein the casting speed is 42-52 mm/min, and the flow rate of casting cooling water is 220-320L/min;
step S2, preparing the cast ingot into a hot-rolled blank with the thickness of 4.0mm by adopting a hot-rolling procedure:
step S21, milling the cast ingot, milling each 10mm large surface, and milling the cold shut;
step S22, carrying out homogenization treatment on the cast ingot after surface milling, determining the homogenization process temperature to be 605 +/-5 ℃ by adopting differential thermal analysis, and carrying out heat preservation for 7 hours; after homogenization treatment, continuously preserving heat for 2 hours and then discharging from the furnace for rolling, wherein in the period of 2 hours of heat preservation, the ingot casting temperature is 515-525 ℃;
step S23, rolling the ingot after the homogenization treatment by a hot continuous rolling mill, wherein the hot rolling and the rough rolling are carried out for 21 times, the thickness of the intermediate billet after the rough rolling is 28mm, and then, carrying out the finish rolling by a 3-stand to obtain a hot rolled blank with the thickness of 4.0mm, wherein the finish rolling temperature is 320-330 ℃;
step S3, cold rolling the hot rolled blank to obtain an aluminum-manganese alloy strip with the thickness of 0.3 mm:
step S31, cold rolling the hot rolled blank, and finally obtaining an aluminum coil with the thickness of 0.3mm through 4 times of rolling, wherein the rolling speed is kept at 800-1000 m/min;
step S32, washing the aluminum coil with alkali liquor in sequence to remove rolling oil, aluminum powder and iron powder falling off from the roller;
and step S33, carrying out low-temperature annealing treatment on the cleaned aluminum coil in an annealing furnace to obtain the aluminum-manganese alloy strip with the thickness of 0.3mm, wherein the annealing temperature is 260 ℃ and the temperature is kept for 10 hours.
2. The method of claim 1, wherein in step S11, intermediate alloys are used for preparing Fe, Si and Mn.
3. The method of claim 1, wherein in step S15, the double-stage filtration employs a 40PPi +60PPi ceramic filter plate combined filter structure.
4. The method of claim 1, wherein in the step S23, the finish rolling 3 stand is required to perform rolling passes of 28mm, 14mm, 8.0mm and 4.0mm in sequence to form the hot rolled blank of 4.0 mm.
5. The method of claim 1, wherein in the step S23, the hot rolled billet is forced to be rapidly cooled by a fan after being discharged.
6. The method of claim 1, wherein in the step S31, the aluminum coil with a final thickness of 0.3mm is formed by rolling with 4.0mm, 1.8mm, 0.85mm, 0.45mm and 0.3mm in sequence.
7. The method for preparing the aluminum-manganese alloy strip according to claim 1, wherein in the step S31, the temperature of the aluminum coil is kept between 140 ℃ and 150 ℃ when the aluminum coil is off-machine.
8. An aluminum manganese alloy strip produced by the method of any one of claims 1 to 7 for use in capacitor cases.
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| CN115029569A (en) * | 2022-06-09 | 2022-09-09 | 中铝河南洛阳铝加工有限公司 | Explosion-proof sheet of cylindrical lithium battery cap and preparation method thereof |
| CN115247239A (en) * | 2021-12-30 | 2022-10-28 | 兰州理工大学 | Aluminum alloy strip for power battery shell and production method thereof |
| CN116555640A (en) * | 2023-05-08 | 2023-08-08 | 浙江永杰铝业有限公司 | Preparation method of aluminum alloy strip and aluminum alloy strip |
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