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7A04 Flat Welding Flange

Flange is the parts which connects two pipe ends, flange connection is defined by the flange, gasket and bolt three are connected as a group of combined sealing structure of the detachable connection.
  • LJ

7A04 is Al-Zn-Mg-CU ultra-high-strength aluminum alloy, also known as ultra-hard aluminum, which is a very mature aluminum in ultra-hard aluminum. It has a longer and wider alloy. High intensity, good thermal treatment reinforcement effect, medium plasticity in annealing and new quenching state; Different from hard aluminum, the corrosion resistance in the state of labor is better than the natural timeliness state, and the natural timeliness process is slow. It can reach the peak of timeliness after a month, so 7A04 is used in the state of quenching. The disadvantage is that the tissue stability is not high, the low-frequency fatigue strength is low, and the tendency of stress corrosion can be ruptured. The alloy point welding is good, the gas welding is poor, and the cutability is good after thermal treatment, but the cuttability after the annealing is not good.

Chemical Composition(%)


Mechanical Property

Tensile Strength  σb (MPa):≥530

Yield Strength σp0.2 (MPa):≥400

Elongation δ10 (%):≥5


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