2A12 plate is a kind of hard aluminum with high strength, which can be strengthened by heat treatment. It has medium plasticity in annealing, hardening and hot states, and good weldability in spot welding. It tends to form intercrystalline cracks when it is used in gas welding and argon arc welding.
Product introduction
Properties and scope of application: it is a kind of high strength duralumin, which can be strengthened by heat treatment. It has medium plasticity in annealing, hardening and hot state. It has good weldability in spot welding, and tends to form intercrystalline cracks when used in gas welding and argon arc welding. The machinability of the alloy is good after quenching and cold work hardening, but poor after annealing. Corrosion resistance is not high, often using anodic oxidation treatment and paint method or surface coated with aluminum layer to improve corrosion resistance.
Chemical composition
Aluminum Al: allowance
Si Si: 0.50 or less
Copper Cu: 3.8 ~ 4.9
Magnesium Mg: 1.2 ~ 1.8
Zinc and zinc: 0.30 or less
Mn: 0.30 ~ 0.9
Ti Ti: 0.15 or less
Ni Ni: 0.10 or less
Iron Fe: 0.000 ~ 0.500
Fe+Ni Fe+Ni: 0.000 ~ 0.50
Applications
Aircraft structure (skin, frame, rib, frame, etc.), rivets, missile components, truck wheels, screw elements and other various structural parts.
Mechanical properties
Tensile strength σ B (MPa) : ≥410
Conditional yield strength σ0.2 (MPa) : ≥265
Elongation δ5 (%) : ≥12
Note: Longitudinal mechanical properties of bar at room temperature
Sample size: bar diameter (square bar, hexagonal bar inner circle diameter)≤22
Heat treatment specification
1) Homogenizing annealing: heating 480 ~ 495℃; Keep warm for 12-14h; Furnace cooling.
2) Complete annealing: heating 390 ~ 430℃; Holding time 30-120min; The furnace is cooled to 300℃ and air-cooled.
3) Rapid annealing: heating 350 ~ 370℃; The holding time is 30 ~ 120min. Air cooling.
4) Quenching and aging: quenching 495 ~ 505℃, water cooling; Artificial aging 185 ~ 195℃,6 ~ 12h, air cooling; Natural aging: 96h at room temperature.
Density
The density of the two is quite different. The density of 6061 can only reach 2.7, while the density of 2A12 can reach around 2.78-2.79 due to the high content of copper alloy. You can get the aluminium sheet density through the following formula:
Weight formula: thickness (mm) * density * length (m) * width (m) = weight
Application
6061 aluminum alloy belongs to 6xxx alloy, having higher silicon content. 2A12 aluminum belong to 2xxx alloy, a kind of Al-Cu-Mg alloy.
6061 aluminum is mainly used for bicycle parts, aerospace parts and building structures. In the aerospace industry, 6061 sheet is used n areas of greater ductility. Since it is easier to shape, 6061 sheet is more commonly used for cans and other round good. 2a12 is widely used in aircraft structures, rivets, and truck wheels.
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