7A04 aluminum square bar/round bar manufacturer china suppli

7A04 aluminum square bar/round bar belongs to Al-Zn-Mg-Cu super-high strength aluminium alloy, also known as super hard aluminium, which is quite mature in super hard aluminium and has been used for a long time and widely. 7A04 aluminum square bar/round bar has high strength, good heat treatment strengthening effect and medium plasticity under annealing and new quenching conditions. Unlike hard aluminium, the corrosion resistance under artificial aging condition is better than that under natural aging condition, and the natural aging process is slow. It takes three months to reach the peak value of aging hardening, so 7A04 can be used under quenched artificial aging condition. Its disadvantages are low structure stability, low frequency fatigue strength and stress corrosion cracking tendency. Alloy spot welding has good weldability, bad gas welding, good machinability after heat treatment, but poor machinability after annealing.
 
 
 
7A04 aluminum square bar/round bar is used in aircraft skin, screw, and stress components such as girder truss, partition frame, wing rib, landing gear, etc.
7A04 aluminum square bar/round bar  performance：
 
Tensile strength b(MPa): > 530
 
Elongation stress P0.2 (MPa): > 400
 
Elongation of 10 (%): 5 %
 
Note: Longitudinal Mechanical Properties of Pipes at Room Temperature
 
1) Homogenization annealing: heating 450-465 C; holding 12-14 h; furnace cooling.
 
2) Complete annealing: heating 390-430 C; holding for 30-120 min; furnace cooling to 150 C air cooling.
 
3) Quenching and aging: quenching 465-480 C, water cooling.
 
4) Artificial aging (aluminium-clad sheet) at 115-125 24h, (non-aluminium-clad profile) at 135-145 16h, (semi-finished product) at 115-125 3H in grade 1, and air-cooled at 155-165 3H in grade 2.