CN110484782B - 8021 alloy high-elongation aluminum foil and preparation process thereof - Google Patents
8021 alloy high-elongation aluminum foil and preparation process thereof Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/40—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling foils which present special problems, e.g. because of thinness
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Abstract
The invention belongs to the technical field of aluminum alloy materials, and discloses an 8021 alloy high-elongation aluminum foil which comprises the following alloy components: si: 0.08-0.1%; fe: 1.25-1.5%; cu: 0.03 percent; mn: 0.03 percent; mg: 0.01 percent; zn: 0.03 percent; cr: 0.03 percent; ti: 0.01 percent; the balance of Al and other inevitable impurity elements. Meanwhile, the production process of the 8021 alloy high-elongation aluminum foil comprises rough rolling, intermediate rolling, coiling, finish rolling, slitting and annealing, wherein the thicknesses of all passes from rough rolling to finished products are respectively as follows: 260 μm → 110 μm → 45 μm → 16.5 μm → 7 μm, wherein the annealing process is at a temperature rising stage, wherein the temperature is raised from room temperature to 210 ℃ for 10 h; and in the high-temperature heat preservation stage, heat preservation is carried out at 210 ℃ for 50-90 h, the material is taken out of the furnace, heat preservation is carried out outside the furnace by covering the material within 30 minutes, and the material is cooled to room temperature. The invention has scientific process, adopts the heat preservation outside the furnace to improve the efficiency of the annealing furnace, is beneficial to improving the elongation, has the aluminum foil elongation higher than domestic similar products, and meets the use requirement of high elongation of customers.
Description
Technical Field
The invention belongs to the technical field of aluminum alloy materials, and relates to a 8021 alloy high-elongation aluminum foil and a preparation process thereof.
Background
Aluminum foil has excellent characteristics such as sealability, light-shielding properties, inertness, formability, hygiene, safety, and the like, and can be directly contacted with food, and has been used as a packaging material in various industrial fields because it has an elegant silvery white luster and is easy to process various colors of beautiful patterns and decorative patterns. The common flexible packaging aluminum foil is mature after years of development. With the wider application of the packaging materials made of aluminum foils, the special requirements on various properties of the aluminum foils are more and more. In order to package high-grade solid substances, packaging enterprises put new requirements on the performance of aluminum foils for solid packaging, mainly the requirements on the elongation and the bursting strength of the aluminum foils are high, and the requirements on the number of needle holes are very low for the packaging tightness.
At present, the performance of aluminum foil products for flexible packaging in China has the burst strength and the pinhole number of individual enterprises reaching the level of Japanese enterprises, and the main problems exist: the elongation is low, the elongation of domestic 7 mu m aluminum foil is 1.5-2.5%, the process level is controlled better internationally, and the elongation of the produced 7 mu m aluminum foil is 2.5-4%.
Disclosure of Invention
In view of the above-mentioned shortcomings in the prior art, the present invention aims to provide a 8021 alloy high-elongation aluminum foil.
Technical scheme
An 8021 alloy high-elongation aluminum foil comprises the following components in percentage by mass: si: 0.08-0.1%; fe: 1.25-1.5%; cu: 0.03 percent; mn: 0.03 percent; mg: 0.01 percent; zn: 0.03 percent; cr: 0.03 percent; ti: 0.01 percent; the balance of Al and other inevitable impurity elements, the blank is 8021 alloy, the tensile strength is 130-160 MPa, and the elongation is more than 3.5%.
In a preferred embodiment of the present invention, the 8021 alloy high-elongation aluminum foil comprises the following components by mass percent: si: 0.08 percent; fe: 1.25 percent; cu: 0.03 percent; mn: 0.03 percent; mg: 0.01 percent; zn: 0.03 percent; cr: 0.03 percent; ti: 0.01 percent; the balance of Al and other inevitable impurity elements, the blank is 8021 alloy, the tensile strength is 138MPa, and the elongation is 3.68%.
In a preferred embodiment of the present invention, the 8021 alloy high-elongation aluminum foil comprises the following components by mass percent: si: 0.09%; fe: 1.40 percent; cu: 0.03 percent; mn: 0.03 percent; mg: 0.01 percent; zn: 0.03 percent; cr: 0.03 percent; ti: 0.01 percent; the balance of Al and other inevitable impurity elements, the blank is 8021 alloy, the tensile strength is 148MPa, and the elongation is 3.71%.
In a preferred embodiment of the present invention, the 8021 alloy high-elongation aluminum foil comprises the following components by mass percent: si: 0.10 percent; fe: 1.5 percent; cu: 0.03 percent; mn: 0.03 percent; mg: 0.01 percent; zn: 0.03 percent; cr: 0.03 percent; ti: 0.01 percent; the balance of Al and other inevitable impurity elements, the blank is 8021 alloy, the tensile strength is 156MPa, and the elongation is 3.58%.
The invention also discloses a preparation process of the 8021 alloy high-elongation aluminum foil, which comprises the following steps:
A. rough rolling: the rough rolling is divided into two passes, the thickness of a blank used for the rough rolling is 260 mu m, and after the rough rolling is finished, the thickness of a product is 45 mu m;
B. intermediate rolling: carrying out medium rolling on the 45 mu m aluminum plate obtained by rough rolling for one pass to obtain an aluminum plate with the outlet thickness of 16.5 mu m;
C. double combination: doubling the aluminum foil with the thickness of 16.5 mu m;
D. finish rolling: carrying out finish rolling on the doubled aluminum foil with the thickness of 16.5 multiplied by 2 mu m for one pass to obtain an aluminum foil with the thickness of 7 mu m;
E. slitting: cutting the aluminum foil according to the width required by a customer;
F. annealing: and annealing the cut aluminum foil by adopting a box type aluminum foil annealing furnace.
In the preferred embodiment of the invention, during rough rolling in the step A, the rough rolling first pass rolling speed is 900-1000 m/min, the rolling force is 1150-1300 KN, the uncoiling tension is less than or equal to 45N/mm, the strip shape curve is 16-17, the oil temperature is 40-50 ℃, the roughness of the working roll is 0.4 μm, the convexity of the working roll is 20% o, the rough rolling second pass rolling speed is 950-1100 m/min, the rolling force is 1350-1500 KN, the uncoiling tension is less than or equal to 45N/mm, the strip shape curve is 16, the oil temperature is 40-50 ℃, the roughness of the working roll is 0.4 μm, and the convexity of the working roll is 20% o.
In the preferred embodiment of the invention, during the intermediate rolling in the step B, the rolling speed is 1150-1300 m/min, the rolling force is 1800-2200 KN, the uncoiling tension is less than or equal to 65N/mm, the sheet profile curve 15, the oil temperature is 40-50 ℃, the roughness of the working roll is 0.16 μm, and the convexity of the working roll is 20 per thousand.
In the preferred embodiment of the invention, during the finish rolling in the step D, the rolling speed is 450-550 m/min, the rolling force is 1700-1900 KN, the uncoiling tension is 25-45N/mm, the sheet profile curve 20, the oil temperature is 40-50 ℃, the roughness of the working roll is 0.11 μm, and the convexity of the working roll is 70 per mill.
In the preferred embodiment of the invention, when the aluminum foil is annealed in the step F, the temperature is raised from room temperature to 210 ℃ in the temperature raising stage, and the temperature raising time is 10 hours; and in the high-temperature heat preservation stage, heat preservation is carried out at 210 ℃ for 50-80 h, after the heat preservation reaches the time, the material is directly discharged out of the furnace, the heat preservation is carried out outside the furnace within 30 minutes by covering the material, and the material is cooled to the room temperature.
Advantageous effects
The 8021 alloy is adopted, the alloy components are adjusted within the national standard range, and the alloy proportion is reasonable; when the aluminum foil is rolled, four-pass high-speed rolling with large rolling reduction is adopted; and low-temperature long-time annealing is adopted, so that the elongation of the product is high, and the breakage resistance and the pinholes reach the international advanced level. When the aluminum foil produced by the invention is used for solid flexible packaging materials, the use requirements of the aluminum foil on elongation, bursting strength and pinhole number can be met.
Detailed Description
The present invention will be described in detail below with reference to examples to enable those skilled in the art to better understand the present invention, but the present invention is not limited to the following examples.
Unless otherwise defined, terms (including technical and scientific terms) used herein should be construed to have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms used herein should be interpreted as having a meaning that is consistent with their meaning in the context of this specification and the relevant art, and should not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
Example 1
The 8021 alloy high-elongation aluminum foil comprises the following components in percentage by mass: si: 0.08 percent; fe: 1.25 percent; cu: 0.03 percent; mn: 0.03 percent; mg: 0.01 percent; zn: 0.03 percent; cr: 0.03 percent; ti: 0.01 percent; the balance of Al and other inevitable impurity elements. The blank adopts 8021 alloy, the tensile strength is 138MPa, and the elongation is 3.68%.
The preparation process of the 8021 alloy high-elongation aluminum foil comprises the following steps:
(1) rough rolling: the rough rolling is divided into two passes, the thickness of a blank used for the rough rolling is 260 mu m, and after the rough rolling is finished, the thickness of a product is 45 mu m;
(2) intermediate rolling: carrying out medium rolling on the 45 mu m aluminum plate obtained by rough rolling for one pass to obtain an aluminum plate with the outlet thickness of 16.5 mu m;
(3) double-closing: doubling the aluminum foil with the thickness of 16.5 mu m;
(4) finish rolling: carrying out finish rolling on the doubled aluminum foil with the thickness of 16.5 multiplied by 2 mu m for one pass to obtain an aluminum foil with the thickness of 7 mu m;
(5) slitting: cutting the aluminum foil according to the width required by a customer;
(6) annealing: and annealing the cut aluminum foil by adopting a box type aluminum foil annealing furnace.
During rough rolling in step 1, the rough rolling first pass rolling speed is 920m/min, the rolling force is 1190KN, the uncoiling tension is 40N/mm, the slab shape curve 17, the oil temperature is 45 ℃, the roughness of the working roll is 0.4 μm, the convexity of the working roll is 20 per thousand, the rough rolling second pass rolling speed is 1080m/min, the rolling force is 1440KN, the uncoiling tension is 42N/mm, the slab shape curve 16, the oil temperature is 45 ℃, the roughness of the working roll is 0.4 μm, and the convexity of the working roll is 20 per thousand.
During the medium rolling in the step 2, the rolling speed is 1220m/min, the rolling force is 1900KN, the uncoiling tension is 48N/mm, the plate shape curve 15, the oil temperature is 44 ℃, the roughness of the working roll is 0.16 mu m, and the convexity of the working roll is 20 per mill.
And 4, during finish rolling, the rolling speed is 475m/min, the rolling force is 1770KN, the uncoiling tension is 36N/mm, the plate shape curve is 18, the oil temperature is 46 ℃, the roughness of the working roll is 0.11 mu m, and the convexity of the working roll is 70 per mill.
And F, during annealing of the aluminum foil, in a heating stage, heating from room temperature to 210 ℃ for 10h, in a high-temperature heat preservation stage, preserving heat at 210 ℃ for 50h, directly discharging the aluminum foil out of the furnace after 50h of heat preservation, covering the aluminum foil for heat preservation within 20 minutes, and cooling to room temperature.
And (3) detecting the performance of a finished product: the thickness of the aluminum foil is 0.007mm, the tensile strength is 72Mpa, the elongation is 3.5%, the elongation is 1.0% higher than that of domestic like products (1.5-2.5%), and the pinhole 29/m achieves the international advanced level.
Example 2
The 8021 alloy high-elongation aluminum foil comprises the following components in percentage by mass: si: 0.09%; fe: 1.40 percent; cu: 0.03 percent; mn: 0.03 percent; mg: 0.01 percent; zn: 0.03 percent; cr: 0.03 percent; ti: 0.01 percent; the balance of Al and other inevitable impurity elements. The blank adopts 8021 alloy, the tensile strength is 148MPa, and the elongation is 3.71%.
The preparation process of the 8021 alloy high-elongation aluminum foil comprises the following steps:
(1) rough rolling: the rough rolling is divided into two passes, the thickness of a blank used for the rough rolling is 260 mu m, and after the rough rolling is finished, the thickness of a product is 45 mu m;
(2) intermediate rolling: carrying out medium rolling on the 45 mu m aluminum plate obtained by rough rolling for one pass to obtain an aluminum plate with the outlet thickness of 16.5 mu m;
(3) double-closing: doubling the aluminum foil with the thickness of 16.5 mu m;
(4) finish rolling: carrying out finish rolling on the doubled aluminum foil with the thickness of 16.5 multiplied by 2 mu m for one pass to obtain an aluminum foil with the thickness of 7 mu m;
(5) slitting: cutting the aluminum foil according to the width required by a customer;
(6) annealing: and annealing the cut aluminum foil by adopting a box type aluminum foil annealing furnace.
During rough rolling in the step 1, the rough rolling first pass rolling speed is 960m/min, the rolling force is 1230KN, the uncoiling tension is 45N/mm, the slab shape curve 16, the oil temperature is 48 ℃, the roughness of the working roll is 0.4 μm, the convexity of the working roll is 20 per thousand, the rough rolling second pass rolling speed is 1022m/min, the rolling force is 1500KN, the uncoiling tension is 45N/mm, the slab shape curve 16, the oil temperature is 48 ℃, the roughness of the working roll is 0.4 μm, and the convexity of the working roll is 20 per thousand.
Step 2, during intermediate rolling, the rolling speed is 1300m/min, the rolling force is 2180KN, the uncoiling tension is 60N/mm, the plate profile curve is 15, the oil temperature is 47 ℃, the roughness of the working roll is 0.16 mu m, and the convexity of the working roll is 20 per mill.
Step 4, during finish rolling, the rolling speed is 535m/min, the rolling force is 1870KN, the uncoiling tension is 44N/mm, the plate shape curve 18, the oil temperature is 47 ℃, the roughness of the working roll is 0.11 μm, and the convexity of the working roll is 70 per mill.
And F, during annealing of the aluminum foil, in a heating stage, heating from room temperature to 210 ℃ for 10h, in a high-temperature heat preservation stage, preserving heat at 210 ℃ for 65h, directly discharging the aluminum foil out of the furnace after preserving heat for 65h, covering the aluminum foil for heat preservation for 30 minutes, and cooling to room temperature.
And (3) detecting the performance of a finished product: the thickness of the aluminum foil is 0.007mm, the tensile strength is 76Mpa, the elongation is 3.86%, the elongation is 1.36% higher than that of domestic like products (1.5-2.5%), and the pinhole 25/m reaches the international advanced level.
Example 3
The 8021 alloy high-elongation aluminum foil comprises the following components in percentage by mass: si: 0.10 percent; fe: 1.5 percent; cu: 0.03 percent; mn: 0.03 percent; mg: 0.01 percent; zn: 0.03 percent; cr: 0.03 percent; ti: 0.01 percent; the balance of Al and other inevitable impurity elements. The blank adopts 8021 alloy, the tensile strength is 156MPa, and the elongation is 3.58%.
The preparation process of the 8021 alloy high-elongation aluminum foil comprises the following steps:
(1) rough rolling: the rough rolling is divided into two passes, the thickness of a blank used for the rough rolling is 260 mu m, and after the rough rolling is finished, the thickness of a product is 45 mu m;
(2) intermediate rolling: carrying out medium rolling on the 45 mu m aluminum plate obtained by rough rolling for one pass to obtain an aluminum plate with the outlet thickness of 16.5 mu m;
(3) double-closing: doubling the aluminum foil with the thickness of 16.5 mu m;
(4) finish rolling: carrying out finish rolling on the aluminum foil 16.5 multiplied by 2 mu m in one pass to obtain the aluminum foil with the thickness of 7 mu m;
(5) slitting: the obtained aluminum foil is cut according to the width required by a customer;
(6) annealing: and annealing the cut aluminum foil by adopting a box type aluminum foil annealing furnace.
During rough rolling in the step 1, the rough rolling first pass rolling speed is 900m/min, the rolling force is 1160KN, the uncoiling tension is 32N/mm, the plate shape curve 16, the oil temperature is 42 ℃, the roughness of the working roll is 0.4 mu m, the convexity of the working roll is 20 per thousand, the rough rolling second pass rolling speed is 970m/min, the rolling force is 1400KN, the uncoiling tension is 36N/mm, the plate shape curve 16, the oil temperature is 42 ℃, the roughness of the working roll is 0.4 mu m, and the convexity of the working roll is 20 per thousand.
Step 2, during medium rolling: the rolling speed is 1170m/min, the rolling force is 1890KN, the uncoiling tension is 42N/mm, the plate shape curve 15, the oil temperature is 44 ℃, the roughness of the working roll is 0.16 mu m, and the convexity of the working roll is 20 per thousand.
And 4, during finish rolling: rolling speed is 485m/min, rolling force is 1750KN, uncoiling tension is 30N/mm, plate shape curve 18, oil temperature is 43 ℃, roughness of a working roll is 0.11 mu m, and convexity of the working roll is 70 per mill.
F, annealing the aluminum foil: and a temperature rising stage, wherein the temperature rises from room temperature to 210 ℃ for 10h, a high-temperature heat preservation stage, heat preservation is carried out at 210 ℃ for 80h, after the heat preservation is carried out for 80h, the furnace is directly discharged, the heat preservation is carried out for 30 min by covering cloth, and the furnace is cooled to the room temperature.
And (3) detecting the performance of a finished product: the thickness of the aluminum foil is 0.007mm, the tensile strength is 70Mpa, the elongation is 4.02%, the thickness is 1.52% higher than that of domestic like products (1.5-2.5%), and the pinhole 26/m reaches the international advanced level.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present invention or directly or indirectly applied to other related technical fields are included in the scope of the present invention.
Claims (4)
1. A preparation process of an 8021 alloy high-elongation aluminum foil comprises the following components in percentage by mass: si: 0.08-0.1%; fe: 1.25-1.5%; cu: 0.03 percent; mn: 0.03 percent; mg: 0.01 percent; zn: 0.03 percent; cr: 0.03 percent; ti: 0.01 percent; the balance of Al and other unavoidable impurity elements, the blank is 8021 alloy, the tensile strength of the blank is 130-160 MPa, and the elongation is more than 3.5%, and the method is characterized by comprising the following steps:
A. rough rolling: the rough rolling is divided into two passes, the thickness of a blank used in the rough rolling is 260 mu m, and after the rough rolling is finished, the thickness of a product is 45 mu m, wherein the rolling speed of a first pass of the rough rolling is 900-1000 m/min, the rolling force is 1150-1300 KN, the uncoiling tension is less than or equal to 45N/mm, the profile curve is 16-17, the oil temperature is 40-50 ℃, the roughness of a working roll is 0.4 mu m, the convexity of the working roll is 20 per thousand, the rolling speed of a second pass of the rough rolling is 950-1100 m/min, the rolling force is 1350-1500 KN, the uncoiling tension is less than or equal to 45N/mm, the profile curve is 16, the oil temperature is 40-50 ℃, the roughness of the working roll is 0.4 mu m, and the convexity of the working roll is 20 per thousand;
B. intermediate rolling: carrying out one-pass intermediate rolling on the 45-micrometer aluminum plate obtained by rough rolling to obtain an aluminum plate with the outlet thickness of 16.5 micrometers, wherein the rolling speed is 1150-1300 m/min, the rolling force is 1800-2200 KN, the uncoiling tension is not more than 65N/mm, the plate shape curve is 15, the oil temperature is 40-50 ℃, the roughness of a working roll is 0.16 micrometer, and the convexity of the working roll is 20 per thousand;
C. double combination: doubling the aluminum foil with the thickness of 16.5 mu m;
D. finish rolling: carrying out one-pass finish rolling on the doubled aluminum foil 16.5 multiplied by 2 mu m to obtain an aluminum foil with the thickness of 7 mu m, wherein the rolling speed is 450-550 m/min, the rolling force is 1700-1900 KN, the uncoiling tension is 25-45N/mm, the plate shape curve is 20, the oil temperature is 40-50 ℃, the roughness of a working roll is 0.11 mu m, and the convexity of the working roll is 70 per thousand;
E. slitting: cutting the aluminum foil according to the width required by a customer;
F. annealing: annealing the cut aluminum foil by adopting a box type aluminum foil annealing furnace, wherein in the temperature rise stage, the temperature rises from room temperature to 210 ℃ and the temperature rise time is 10 hours; and in the high-temperature heat preservation stage, heat preservation is carried out at 210 ℃ for 50-80 h, after the heat preservation reaches the time, the material is directly discharged out of the furnace, the heat preservation is carried out outside the furnace within 30 minutes by covering the material, and the material is cooled to the room temperature.
2. The preparation process of the 8021 alloy high-elongation aluminum foil of claim 1, wherein the aluminum foil comprises the following components in percentage by mass: si: 0.08 percent; fe: 1.25 percent; cu: 0.03 percent; mn: 0.03 percent; mg: 0.01 percent; zn: 0.03 percent; cr: 0.03 percent; ti: 0.01 percent; the balance of Al and other inevitable impurity elements, the blank is 8021 alloy, the tensile strength is 138MPa, and the elongation is 3.68%.
3. The preparation process of the 8021 alloy high-elongation aluminum foil of claim 1, wherein the aluminum foil comprises the following components in percentage by mass: si: 0.09%; fe: 1.40 percent; cu: 0.03 percent; mn: 0.03 percent; mg: 0.01 percent; zn: 0.03 percent; cr: 0.03 percent; ti: 0.01 percent; the balance of Al and other inevitable impurity elements, the blank is 8021 alloy, the tensile strength of the alloy is 148MPa, and the elongation of the alloy is 3.71 percent.
4. The preparation process of the 8021 alloy high-elongation aluminum foil of claim 1, wherein the aluminum foil comprises the following components in percentage by mass: si: 0.10 percent; fe: 1.5 percent; cu: 0.03 percent; mn: 0.03 percent; mg: 0.01 percent; zn: 0.03 percent; cr: 0.03 percent; ti: 0.01 percent; the balance of Al and other inevitable impurity elements, the blank is 8021 alloy, the tensile strength of the alloy is 156MPa, and the elongation of the alloy is 3.58%.
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| CN111270109B (en) * | 2020-03-31 | 2022-03-15 | 江苏鼎胜新能源材料股份有限公司 | Method for producing 8021 aluminum alloy soft packaging foil for lithium battery by cast rolling method |
| CN111500900A (en) * | 2020-05-12 | 2020-08-07 | 江苏大亚铝业有限公司 | Solid packaging aluminum foil and production process thereof |
| CN112251652B (en) * | 2020-10-22 | 2022-05-06 | 厦门厦顺铝箔有限公司 | Production method of aluminum foil for high-elongation lithium ion battery |
| CN115401072A (en) * | 2022-09-07 | 2022-11-29 | 江苏大亚铝业有限公司 | Process for producing high-elongation hose foil from 8011 aluminum alloy blank |
| CN117701953B (en) * | 2023-12-27 | 2024-07-05 | 北京一控系统技术有限公司 | Aluminum alloy material and method for preparing double-zero aluminum foil by using same |
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| CN106011708A (en) * | 2016-06-06 | 2016-10-12 | 中南大学 | Heat treatment technology for 8021 high-performance aluminum foil for soft package |
| CN106311747A (en) * | 2016-08-23 | 2017-01-11 | 江苏中基复合材料股份有限公司 | Aluminum foil for lithium ion battery flexible package aluminum plastic film and production process for aluminum foil |
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| CN106011708A (en) * | 2016-06-06 | 2016-10-12 | 中南大学 | Heat treatment technology for 8021 high-performance aluminum foil for soft package |
| CN106311747A (en) * | 2016-08-23 | 2017-01-11 | 江苏中基复合材料股份有限公司 | Aluminum foil for lithium ion battery flexible package aluminum plastic film and production process for aluminum foil |
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