7 series aluminum alloys are still widely used in the aviation industry. Its characteristics are that after solid solution treatment and plasticity, the heat treatment strengthening effect is very good, it has high strength below 150℃, and has very good strength at low temperature; poor welding performance; has a tendency of stress corrosion cracking; needs to be protected with aluminum or other used together with processing. Two-stage aging can improve the alloy's ability to resist stress corrosion cracking. In the annealed and quenched state, the plasticity is slightly lower than that of 2A12 in the same state.
The 7075 varieties are divided into plates, thick plates, bars, profiles, rows, wire rods, rolled or cold-processed bars, and cold-processed wire rods. There are O state, T6 state, T651 state, T6511 state, T73 state, T7351 state, T7651 state, T76511 state and H13 state. Typical applications: aerospace industry, blow molding (bottle) molds, ultrasonic plastic welding molds, golf heads, shoe molds, paper molds, foam molding molds, dewaxing molds, templates, fixtures, mechanical equipment, mold processing, etc. Stressed structural parts.
