2A12 aluminum alloy is a high-strength hard aluminum that can be strengthened by heat treatment; 2A12 aluminum alloy has good spot welding performance, and there is a tendency to form intergranular cracks when using gas welding and argon arc welding; 2A12 aluminum alloy has good machinability after cold work hardening. The corrosion resistance is not high, and anodizing treatment and painting methods or surface coating with aluminum layer are often used to improve the corrosion resistance.
Standard: GB/T 3191-2010 replaces the old GB/T 3191-1998,
● Purpose:
The main purpose is to produce various high load parts and components (excluding stamped and forged parts) such as skeleton parts, skins, frames, ribs, beams, rivets, and other working parts below 150 ℃ on aircraft.
● Chemical composition:
Aluminum Al: Excess
Silicon Si: ≤ 0.50
Copper Cu: 3.8~4.9
Magnesium Mg: 1.2~1.8
Zinc: ≤ 0.30
Manganese Mn: 0.30-0.9
Titanium Ti: ≤ 0.15
Nickel Ni: ≤ 0.10
Iron Fe: 0.0000-0.500
Iron+Nickel Fe+Ni: 0.0000-0.500
Note: Single: ≤ 0.05; Total: ≤ 0.10
Tensile strength σ b (MPa): ≥ 410
Yield strength σ 0.2 (MPa): ≥ 265
Elongation rate δ 5 (%): ≥ 12
2A12 Aluminum Alloy Heat Treatment Specification:
1) Homogenization annealing: Heating at 480-495 ℃; Insulate for 12-14 hours; Furnace cold.
2) Complete annealing: Heating at 390-430 ℃; The insulation time is 30-120 minutes; Cool the furnace to 300 ℃ and air cool.
3) Rapid annealing: heating at 350-370 ℃; The insulation time is 30-120 minutes; Air cold.
4) Quenching and aging: Quenching at 495-505 ℃, water cooling; Artificial aging at 185-195 ℃, 6-12 hours, air cooling; Natural aging: 96 hours at room temperature.
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