1. The basic properties of aluminum

Silver white, can form an oxide film to prevent metal corrosion in humid air, relative density 2.7g/cm3, melting point 660℃, boiling point 2327℃, high specific strength, good electrical and thermal conductivity, high reflection properties and oxidation resistance.

2. Type

Profiles: aluminum profiles, aluminum pipes, aluminum bars, etc.

Sheets: aluminum sheet, aluminum foil, aluminum strip (coil)

Casting: aluminum castings, aluminum pellets

3. Commonly used grades


The first digit of the grade represents the aluminum alloy series, the second digit represents the modification of the original aluminum alloy, and the last two digits represent the purity of the aluminum alloy in the same group.

1100: For processing parts that require good formability and high corrosion resistance, but do not require high strength. Such as storage containers, sheet metal workpieces, deep-drawn concave vessels, heat exchangers, printing plates, nameplates, reflectors, etc.

2011: Free-cutting alloy, good machinability and high strength, but poor corrosion resistance, suitable for volume shafts, optical components, screw heads, screws and machining products that require good cutting performance.

3003: The performance of 1xxx series alloys is higher than that of 1xxx series alloys, such as kitchenware, food and chemical products processing and storage devices, tanks and tanks for transporting liquid products, and various pressure vessels and pipes for sheet processing.
4A01: High silicon content, heat-resistant, wear-resistant, it belongs to building materials, mechanical parts, forging materials, welding materials.

5052: The most representative alloy of medium strength (5083 is the highest), with good corrosion resistance, weldability and formability, especially high fatigue strength, good seawater resistance, used in the manufacture of aircraft fuel tanks, oil pipes, and transportation vehicles, Sheet metal parts of ships, instruments, street lamp brackets and rivets, hardware products, etc.

6061: Heat-treated corrosion-resistant alloy. Treated with T6, it can have a very high endurance value, but the strength of the welded joint is low, so it is suitable for screws, ships, vehicles, and land structures.

6N01: A medium-strength extrusion alloy, which can be used for large-scale thin meat profiles with complex shapes, with good corrosion resistance and weldability. Suitable for vehicles, land structures, ships.

6063: A representative alloy for extrusion, with lower strength than 6061, good extrudability, can be used as profiles with complex cross-sectional shapes, good corrosion resistance and surface treatment, suitable for building highway guardrails, vehicles, furniture, home appliances Products, decorations.

7072: Low electrode potential, mainly used for anti-corrosion covering leather, also suitable for heat exchanger fins, air conditioner aluminum foil and ultra-thin strips.

7075: One of the alloys with the highest strength among the aluminum alloys, but the corrosion resistance is not good. The covering with 7072 can improve its corrosion resistance, but the cost increases. Suitable for aircraft, ski poles, thick plate forgings.

Material selection example:

The product requirements are relatively hard, the surface treatment is coarse wire drawing or coarse sand surface, 5000 series aluminum alloy is selected, commonly used: 5052
For products with high surface treatment requirements, there should be no sand holes or traces of profiles. 6000 series aluminum alloys are selected. Commonly used: 6063/6061
The price of the product is cheap, and the stretched body needs to be reviewed. 2000 series pure aluminum is selected. Commonly used: 2011
The product has high strength and high hardness. It needs to be used for load-bearing structure. Choose 7000 series aluminum alloy. Commonly used: 7075

4. Surface treatment of aluminum

1. Anodizing after sandblasting or wire drawing

2. Electrophoretic paint

3. Powder electrostatic spraying after polishing, fluorocarbon spraying

4. Electroplating after polishing mirror

5. Wood grain heat transfer printing

6. Polymer PVC film