2A12 introduction / About 
 Features and Scope: hard aluminum is a high-strength, heat strengthened, annealed, just quenching and thermal state of plasticity in the middle spot welding, gas welding and argon have a tendency to the formation of intergranular cracks ; alloy after quenching and cold hardening, cutting performance is still good, bad when in the annealed condition. The corrosion resistance is not high, often anodized and painted or surface-coated aluminum layer to improve corrosion resistance. 
 2A12 aluminum chemical composition analysis 
 Al of Al: margin 
 Silicon Si: ≤ 0.50 
 Copper Cu: 3.8 ~~ 4. 
 9 Magnesium Mg: 1.2 to 1.8 
 Zinc of Zn: ≤ 0.30 
 Mn Mn: 0.30 ~ 0.9 
 Ti a Ti: ≤ 0.15 
 Ni - Ni: ≤ 0.10 
 Iron Fe: 0.000 to 0.500 
 Fe + Ni-Fe + Ni: 0.000 ~ 0.50 
 2A12 aluminum production technology and characteristics 
 Aircraft structures (skin, skeleton, ribbed, bulkheads, etc.), rivets, missile components, the card wheel hub, propeller components and various other structures. 
 The 2A12 technology standards 
 GB/T3180-97 
 The 2A12 heat status 

 O, T3, T361, T4, T72, T81, T861 
 O, T351, T361, T851, T861 
 O, T3, 
 O, T3, T3510, T3511, T81, T8510, T8511 
 O, T13, T351, T4, T6, T851 
 O, H13, T36, T4 in, T6, 
 T4 

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