Fine-grain homogeneous mirror surface aluminum alloy rolled plate strip and preparation method thereof
A technology for aluminum alloy and rolled sheet, which is applied in the field of fine-grained homogeneous mirror-finished aluminum alloy rolled sheet and strip and its preparation, and can solve the problem of uneven grain size and orientation distribution of aluminium material, surface discoloration of domestic mirror-finished aluminium, The problem of low order degree of the oxide film can achieve the effect of random distribution of texture, excellent surface quality and small grain size
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[0026] A method for preparing a fine-grain homogeneous mirror-surface aluminum alloy rolling plate and strip, comprising the following steps:
[0027] (1) The fine-grain homogeneous mirror-surface aluminum alloy ingot is hot-rolled after semi-continuous casting and homogenization heat treatment to obtain a hot-rolled strip; the hot-rolling final rolling temperature is 260°C to 360°C. The thickness of the hot-rolled strip is 6.0 mm to 10.0 mm.
[0028] (2) Cold rolling and recrystallization annealing are performed on the hot-rolled strip to obtain the treated strip; the recrystallization annealing temperature is 300° C. to 350° C. The thickness of the strip after treatment is 2.0mm-5.0mm.
[0029] (3) Carry out mirror rolling and secondary annealing treatment on the treated strip to obtain fine-grained homogeneous mirror aluminum alloy rolled strip for anodic oxidation with excellent surface quality; the secondary annealing temperature is 260°C to 310°C ℃. The thickness of t...
Embodiment 1
[0033] The components and mass percentages of the fine-grain homogeneous mirror aluminum alloy are: Si≤0.06%, Fe≤0.04%, Mn≤0.03%, Zn≤0.04%, Mg 0.8%-1.1%, Ti≤0.01%, The sum of other impurity elements is ≤0.01%, and the balance is Al.
[0034] The ingot obtained by smelting the fine-grain homogeneous mirror-surface aluminum alloy is subjected to semi-continuous casting and homogenization heat treatment, and then hot-rolled to obtain a hot-rolled strip with a thickness of 7mm; the final hot-rolling temperature is 270°C.
[0035] The hot-rolled strip is subjected to cold rolling and recrystallization annealing treatment to obtain a treated strip with a thickness of 4 mm; the recrystallization annealing temperature is 340° C.
[0036] Mirror rolling and secondary annealing are carried out on the treated strip to obtain a fine-grained homogeneous mirror aluminum alloy rolled strip with a thickness of 2.0mm and excellent surface quality for anodic oxidation; the secondary annealing t...
Embodiment 2
[0041] The composition and mass percentage of the fine-grain homogeneous mirror aluminum alloy are: Si≤0.06%, Fe≤0.04%, Cu≤0.2%, Mn≤0.03%, Mg 0.5%-1.1%, and the sum of other impurity elements≤ 0.01%, and the balance is Al.
[0042] The ingot obtained by smelting the fine-grain homogeneous mirror-surface aluminum alloy is subjected to semi-continuous casting and homogenization heat treatment, and then hot-rolled to obtain a hot-rolled strip with a thickness of 8 mm; the final hot-rolling temperature is 330°C.
[0043] The hot-rolled strip is subjected to cold rolling and recrystallization annealing treatment to obtain a treated strip with a thickness of 3 mm; the recrystallization annealing temperature is 320° C.
[0044] Mirror rolling and secondary annealing are carried out on the treated strip to obtain a fine-grained homogeneous mirror aluminum alloy rolled strip with a thickness of 1.2mm and excellent surface quality for anodic oxidation; the secondary annealing temperatur...
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