I. 6061-T6
6061-T6, known as aviation hard aluminum, is lightweight, high-strength, and has high production costs, hence its high price.
It is an abbreviation for the T6 hardening treatment of 6061 aviation aluminum alloy, which has excellent formability, weldability, machinability, and medium strength. It can still maintain good operability after annealing.
Typical applications are aviation fixtures, trucks, tower buildings, ships, pipes, and other areas requiring strength, weldability, and corrosion resistance.
The chemical composition range is 0.4-0.8Si, 0.70Femax, 0.15-0.40Cu, 0.15Mnmax, 0.80-1.20Mg, 0.04-0.35Cr, 0.25Znmax, 0.15Timax, with each component having a maximum content of 0.05, and the total maximum content of other components is 0.15, the remainder being Al.
The main alloying elements in the 6061 alloy are magnesium and silicon, which provide medium strength, good corrosion resistance, weldability, and better oxidation effects.
It is widely used in various industrial structural parts that require certain strength and high corrosion resistance, such as manufacturing trucks, tower buildings, ships, trams, railway vehicles, furniture, etc.
1. Chemical Composition Limits wt%
| Cu | 0.15-0.4 |
| Si | 0.4-0.8 |
| Fe | 0.7 |
| Mn | 0.15 |
| Mg | 0.8-1.2 |
| Zn | 0.25 |
| Cr | 0.04-0.35 |
| Ti | 0.15 |
| Pb.Bi | / |
| Al | Remaining |
2. Typical Mechanical & Physical Properties
| Weldability | Machinability | Corrosion resistance | Electrical Conductivity at 20°C (68°F) (%IACS) | Density (20℃) (g/cm3) |
| Very good | General | Good | 40-50 | 2.70 |
| Tensile strength (25°C MPa) | Yield Strength (25°C MPa) | Hardness 500kg force 10mm ball | Elongation rate 1.6mm (1/16in) Thickness | Maximum Shear Stress MPa |
| 310 | 276 | 95 | 12 | 205 |
II. 6063 Alloys
The primary alloying elements in 6063 alloy are magnesium and silicon.
According to expert analysis, it has excellent machinability, superior weldability, extrudability, and electroplating, good corrosion resistance, and toughness.
It is easy to polish, color, and the anodizing effect is excellent, making it a typical extrusion alloy.
The 6063 alloy is widely used in architectural profiles, irrigation pipes, vehicles, stands, furniture, elevators, fencing, and other pipes, rods, and profiles.
1. Chemical Composition Limits wt%
| Cu | 0.1 |
| Si | 0.2-0.6 |
| Fe | 0.35 |
| Mn | 0.1 |
| Mg | 0.45-0.9 |
| Zn | 0.1 |
| Cr | 0.1 |
| Ti | 0.1 |
| Pb.Bi | / |
| Al | Remaining |
2. Typical Mechanical & Physical Properties
| Weldability | Machinability | Corrosion resistance | Electrical Conductivity 20℃(68℉) (%IACS) | Density (20℃)(g/cm3) |
| Very good | General | Very good | 55-63 | 2.70 |
| Tensile strength (25°C MPa) | Yield Strength (25°C MPa) | Hardness500kg force 10mm ball | Elongation rate 1.6mm(1/16in) Thickness | Maximum Shear Stress MPa |
| 185 | 145 | 60 | 12 | 115 |
III. 7075-T6
After solution treatment, 7075-T6 has good plasticity and excellent heat treatment strengthening effects.
It maintains high strength at temperatures below 150 degrees and has particularly good low-temperature strength.
However, it has poor welding performance and a tendency for stress corrosion cracking.
Double aging can improve its resistance to SCC. The main alloying element of 7075 is zinc, which gives it high strength, good mechanical properties, and anodic reactions.
It is mainly used to manufacture aircraft structures and other high-stress structural parts that require high strength and strong corrosion resistance, such as the upper and lower wing wall panels and stringers on aircraft.
After solution treatment, it has good plasticity, good heat treatment strengthening effects, good strength at temperatures below 150 degrees, and particularly good low-temperature strength, but poor welding performance and a tendency for stress corrosion cracking.
It is also widely used in mold processing, mechanical equipment, and fixture clamps.
1. Chemical Composition Limits wt%
| Cu | 1.2-2.0 |
| Si | 0.4 |
| Fe | 0.5 |
| Mn | 0.3 |
| Mg | 2.1-2.9 |
| Zn | 5.1-6.1 |
| Cr | 0.4 |
| Ti | 0.06 |
| Pb.Bi | / |
| Al | Remaining |
2. Typical Mechanical & Physical Properties
| Weldability | Machinability | Corrosion resistance | Electrical Conductivity 20℃(68℉) (%IACS) | Density (20℃) (g/cm3) |
| Bad | Very Good | Average | 40-50 | 2.85 |
| Tensile Strength (25°C MPa) | Yield Strength (25°C MPa) | 500kg force 10mm ball | Elongation Rate 1.6mm(1/16in) Thickness | Maximum Shear Stress MPa |
| 570 | 505 | 150 | 11 | 330 |
