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Elimination method of annealing white spots on the edge of cold-rolled aluminum

An annealing and aluminum coil technology, applied in the field of aluminum alloy heat treatment, can solve problems such as white spot defects in aluminum coils

Active Publication Date: 2020-12-01
GUANGXI LIUZHOU YINHAI ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The problem to be solved by the present invention is to provide a method for eliminating white spots on the edges of cold-rolled aluminum coils, so as to solve the problem of white spots on the edges of existing aluminum coils during complete annealing

Method used

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  • Elimination method of annealing white spots on the edge of cold-rolled aluminum
  • Elimination method of annealing white spots on the edge of cold-rolled aluminum
  • Elimination method of annealing white spots on the edge of cold-rolled aluminum

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Embodiment 1

[0022] The method for eliminating the annealed white spots at the edge of cold-rolled aluminum coils deals with aluminum coil 1, alloy 1235, thickness 4.0mm, width 1350mm, and coil diameter 2000mm, including the following steps:

[0023] A. When fully annealed, after pushing the aluminum coil into the annealing furnace, fill the annealing furnace with high-purity argon gas, and the argon concentration reaches 90%;

[0024] B. Annealing begins to heat up. When the material temperature rises to 200°C, keep it warm for 6 hours, and control the coiling tensile stress before annealing at 25MPa;

[0025] C. After the heat preservation is over, continue to fill with high-purity argon until the argon concentration in the furnace reaches 98.0%;

[0026] D. Continue to heat up to a material temperature of 500°C, keep it warm for 5 hours, and then cool it to a material temperature of 150°C with the furnace and then release it from the furnace. After unpacking inspection, there is no ann...

Embodiment 2

[0028] The method for eliminating the annealed white spots on the edge of cold-rolled aluminum coils deals with aluminum coil 2, alloy 5052, with a thickness of 1.17mm, a width of 2600mm, and a coil diameter of 2500mm, including the following steps:

[0029] A. When fully annealed, after the aluminum coil is pushed into the annealing furnace, the annealing furnace is filled with high-purity argon gas, and the argon concentration reaches 98%;

[0030] B. Annealing begins to heat up. When the material temperature rises to 240°C, keep it warm for 15 hours, and control the coiling tensile stress before annealing at 50MPa;

[0031] C. After the heat preservation is over, continue to fill with high-purity argon until the argon concentration in the furnace reaches 100%;

[0032] D. Continue to heat up to a material temperature of 320°C, keep it warm for 8 hours, and cool down to a material temperature of 200°C with the furnace before it is released from the furnace. After unpacking ...

Embodiment 3

[0034] The method for eliminating the annealed white spots on the edge of cold-rolled aluminum coils deals with aluminum coil 2, alloy 5052, with a thickness of 1.17mm, a width of 2600mm, and a coil diameter of 2500mm, including the following steps:

[0035] A. When fully annealed, push the aluminum coil into the annealing furnace, and fill the annealing furnace with high-purity neon gas, and the neon gas concentration reaches 91%;

[0036] B. Annealing begins to heat up. When the material temperature rises to 220°C, keep it warm for 8 hours, and control the coiling tensile stress before annealing at 35MPa;

[0037] C. After the heat preservation is over, continue to fill high-purity neon gas until the concentration of neon gas in the furnace reaches 99.5%;

[0038] D. Continue to heat up to a material temperature of 400°C, keep it warm for 7 hours, and cool it to a material temperature of 190°C with the furnace before it is released from the furnace. After unpacking inspecti...

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Abstract

The invention discloses a method for eliminating annealing white spots on the edge of a cold-rolled aluminum coil, and relates to the technical field of aluminum alloy heat treatment. The method comprises the steps: A, when complete annealing is about to be carried out, after the aluminum coil is pushed into an annealing furnace, filling the annealing furnace with high-purity inert gas, wherein the concentration of the inert gas reaches 90-98%; B, during annealing, increasing the temperature to 200 to 240 DEG C, preserving the temperature for 6 to 15 hours, and controlling the coiling tensilestress before annealing to be 25 MPa or more; C, after the heat preservation is finished, filling the annealing furnace with high-purity argon until the concentration of the inert gas in the furnace reaches 98-100%; and D, increasing the temperature to the target temperature for complete annealing, preserving the temperature, cooling to 200 DEG C or below along with the furnace, and discharging. Compared with the prior art, the method can solve the problem that the edge of an existing aluminum coil has white spot defects in the process of complete annealing.

Description

technical field [0001] The invention relates to the technical field of heat treatment of aluminum alloys, in particular to a method for eliminating edge annealing white spots in the complete annealing process of an aluminum coil. Background technique [0002] In the production process of aluminum alloy, since complete annealing can eliminate work hardening, restore the material to its original state, and obtain O state, it is often necessary to perform complete annealing, and then perform corresponding cold deformation after complete annealing to obtain the corresponding state and performance . For example, the production of 1235 alloy aluminum foil blanks with a thickness of 0.25 mm and a state of H14 often requires complete annealing at a thickness of 0.5 mm to 0.6 mm, and then undergoes a cold deformation of 50% to 58% to obtain the state of H14. For another example, to produce a 5052 alloy sheet with a thickness of 1 mm and a state of H32, complete annealing in the thic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/04C22F1/02
CPCC22F1/02C22F1/04
Inventor 蒙春标赵明伟张伟付平黄成安陈兴旺庞凤彭响娥
Owner GUANGXI LIUZHOU YINHAI ALUMINUM IND
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