Aluminum 5A02: 5A02 aluminum characteristic for Al-Mg series aluminum alloy, compared with 3A21, 5A02 aluminum high strength, especially those with higher fatigue strength; and 3A21 similar plasticity and high corrosion resistance; heat treatment can not strengthen, and hydrogen atoms with contact welding welding is good, there is a tendency when welding solidification cracking; 5A02 aluminum in work hardening and work hardening state semi-good machinability, can poor machinability in the annealed condition , can be polished. Purpose: 5A02 aluminum is an AL-Mn alloy, is the most widely used an aluminum alloy, high strength of this alloy, especially with anti-fatigue strength: high ductility and corrosion resistance, heat treatment can enhance ,, When the plastic is still good half-cold hardening, work hardening plasticity when low, good corrosion resistance, good weldability, machinability bad, can be polished. Mainly used for high plasticity and good weldability, working in a liquid or gaseous medium low load parts, such as tanks, gasoline or oil conduit, and a variety of other liquid containers made by deep drawing of a small load parts: wire used to make rivets. Chemical composition: Al Al: margin silicon Si: ≤0.40 copper Cu: ≤0.10 magnesium Mg: 2.0 ~ 2.8 Mn Mn: 0.15 ~ 0.40 Los Cr: 0.15 ~ 0.40 Titanium Ti: ≤0.15 iron Fe: 0.000 ~ 0.400 Fe + Si Fe + Si: 0.000 ~ 0.600 Note: Individual: ≤0.05; Total: ≤0.15 Mechanical Properties: Tensile strength σb (MPa): ≤147 Elongation δ10 (%): ≥14 Note: The vertical bar at room temperature mechanical properties of the test sample size: bar diameter (square bar, hexagonal bar circle diameter) ≤150 heat treatment specifications: 1) homogenization: Heat 440 ℃; holding 12 ~ 14h; air cooling. 2) rapid thermal annealing: heating 350 ~ 410 ℃; holding time 30 ~ 120min; air or water. 3) high temperature annealing: heating 350 ~ 420 ℃; finished thickness ≥6mm or <6mm, the holding time of 2 ~ 10min or 10 ~ 30min; air cooling. 4) low-temperature annealing: heating 250 ~ 300 ℃ or 150 ~ 180 ℃; holding time of 1 ~ 2h, air-cooled state: aluminum and aluminum checkered plate (O state)