7xxx series aluminum alloy sheet and preparation process thereof

An aluminum alloy plate and plate technology, applied in the field of 7xxx series aluminum alloy plate and its preparation process, can solve the problems of high strength and high surface aesthetics, many surface defects, and insufficient oxide film strength, etc., and achieve the reduction of residual Effects of stress, increased strength and hardness, and reduced tendency to deform

Pending Publication Date: 2018-09-18
广西南南铝加工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the above-mentioned technical problems, the present invention provides a 7xxx series aluminum alloy plate and its preparation method, aiming to overcome the many surface defects and insufficient oxide film strength of the 7xxx series aluminum alloy plate prepared in the prior art after anodic oxidation treatment. The defect that it is difficult to meet the requirements of high strength and high surface aesthetics at the same time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A preparation method of 7xxx series aluminum alloy plate, the operation steps are as follows:

[0035] (1) Smelting: In terms of mass percentage, the following elements of the alloy are prepared: Mg=1.87%, Zn=5.63%, Cu=0.33%, Fe=0.09%, Si=0.03%, Mn=0.002%, Zr=0.0003 %, Cr=0.0005%, Ti=0.026%, the balance is Al and other unavoidable elements, each unavoidable other element is less than 0.01% and the total amount is less than 0.05%; calculated according to the above alloy composition, each The two kinds of raw materials are mixed for smelting, that is, heated to 760°C to melt the materials and kept for 3 hours to obtain molten aluminum;

[0036] (2) degassing and filtering: degassing the molten aluminum obtained in step (1), and then filtering to remove the insoluble matter in the molten aluminum;

[0037] (3) Casting: casting the aluminum liquid obtained after degassing and filtering in step (2), cooling to room temperature, and obtaining an ingot with a thickness of 620...

Embodiment 2

[0047] A preparation method of 7xxx series aluminum alloy plate, the operation steps are as follows:

[0048] (1) Smelting: In terms of mass percentage, the following elements of the alloy are prepared: Mg=1.79%, Zn=5.93%, Cu=0.27%, Fe=0.08%, Si=0.04%, Mn=0.004%, Zr=0.0002 %, Cr=0.0003%, Ti=0.022%, the balance is Al and other unavoidable elements, each unavoidable other element is less than 0.01% and the total amount is less than 0.05%; calculated according to the above alloy composition, each The two kinds of raw materials are mixed for smelting, that is, heated to 750°C to melt the materials and kept for 6 hours to obtain molten aluminum;

[0049] (2) degassing and filtering: degassing the molten aluminum obtained in step (1), and then filtering to remove the insoluble matter in the molten aluminum;

[0050] (3) Casting: casting the aluminum liquid obtained after degassing and filtering in step (2), cooling to room temperature, and obtaining an ingot with a thickness of 320...

Embodiment 3

[0060] A preparation method of 7xxx series aluminum alloy plate, the operation steps are as follows:

[0061] (1) Smelting: In terms of mass percentage, the following alloy elements are prepared: Mg=1.9%, Zn=6.1%, Cu=0.29%, Fe=0.07%, Si=0.04%, Mn=0.0018%, Zr=0.0003 %, Cr=0.0006%, Ti=0.024%, the balance is Al and other unavoidable elements, each unavoidable other element is less than 0.01% and the total amount is less than 0.05%; calculated according to the above alloy composition, each The two kinds of raw materials are mixed for smelting, that is, heated to 760°C to melt the materials and kept for 5 hours to obtain molten aluminum;

[0062] (2) degassing and filtering: degassing the molten aluminum obtained in step (1), and then filtering to remove the insoluble matter in the molten aluminum;

[0063] (3) Casting: casting the molten aluminum obtained after degassing and filtering in step (2), cooling to room temperature, and obtaining an ingot with a thickness of 420 mm;

...

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Abstract

The invention discloses a 7xxx series aluminum alloy sheet and a preparation process thereof. The 7xxx series aluminum alloy sheet comprises the compositions of 1.7-1.9% of Mg, 5.0-6.5% of Zn, 0.25-0.40% of Cu, lass than or equal to 0.10% of Fe, less than or equal to 0.06% of Si, lass than or equal to 0.01% of Mn, less than or equal to 0.01% of Zr, less than or equal to 0.01% of Cr, 0.01-0.03% ofTi, and the balance Al and inevitable elements. The preparation process comprises the following steps that (1), smelting is performed; (2) degassing and filtration are performed; (3) casting is performed; (4) soaking is performed; (5) saw cutting and milling surface are performed; (6) preheating and hot rolling are performed; (7) edge trimming and transverse knife uncoiling are performed; (8) solid solution quenching is performed; (9) stretching is performed; (10) aging is performed; and (11) saw cutting is performed, and aluminum alloy sheet finished products are obtained. The surface hardness of the aluminum alloy sheet prepared by the preparation process is no less than 150HV, no bank mark on the surface after anodizing is achieved, the color is close to that of aluminum metal, and the7xxx series aluminum alloy sheet can be widely used in IT appearance structural parts.

Description

technical field [0001] The invention relates to an aluminum alloy plate and a preparation process thereof, in particular to a 7xxx series aluminum alloy plate and a preparation process thereof. Background technique [0002] Different elements are added to pure aluminum to cast different series of aluminum alloys, mainly 1xxx series pure aluminum, 2xxx series Al-Cu alloys, 3xxx series Al-Mn alloys, 4xxx series Al-Si alloys, 5xxx series Al-Mg alloys, 6xxx series Al-Mg-Si alloy, 7xxx Al-Zn-Mg and Al-Zn-Mg-Cu alloy. The conventional mechanical properties of aluminum alloy vary with the type, state and content of each added element. The tensile strength can vary between 50-800MPa, the yield strength can vary between 10-700MPa, and the elongation can vary between 2 Varies between % and 50%. Due to the low strength of 1xxx series and 3xxx series, the unsatisfactory anodizing effect of 2xxx series, and poor processability and surface color of 4xxx series, 5xxx series and 6xxx alum...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/10C22C1/02C22F1/053
Inventor 姜文平莫灼强莫肇月刘莹柳华炎曹宇邓松云朱玉涛
Owner 广西南南铝加工有限公司
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