Airplanes
One of the most notable uses for 6061-T6 is aircraft construction. Because the material can be extruded and heat treated, it is commonly used for structural frameworks including the wings and fuselage. It is more commonly used in private aircraft than commercial aircraft, but its strength per unit weight ratio is very high, making it ideal for large parts that must be as light as possible.
Watercraft
Boat makers also use 6061-T6 aluminum because of its light weight and high strength. Hulls of larger yachts that cannot be fabricated from fiberglass are made of this material. It is also the material of choice for sailboat masts. Small, flat-bottom river and lake boats and canoes are made almost entirely of 6061-T6. While it is commonly used in watercraft, bare aluminum is susceptible to corrosion when exposed to salt water. The material is still used in these cases, but usually has an applied protective epoxy coating over the top.
Fluid Handling
Since 6061-T6 is less expensive than stainless steel and about a third the weight, it is a good choice for process piping and tubing. With its noncorrosive characteristics, it is usually used for water, air, and hydraulic and lube oil piping. Because it can fatigue the aluminum is regularly inspected for cracking, or just replaced on a routine basis. It's weight allows for lighter support structures and lower construction costs. It can be welded, but to maintain its strength must be heat-treated to relieve internal stresses and restore the material to its original strength.
Heat Exchangers
The 6061-T6 aluminum is frequently used in applications where heat transfer is required. Car and air conditioner radiator fins, plate heat exchangers, air coolers, and electronic part heat-sinks are common products. Aluminum conducts and dissipates heat well and since it can be extruded, it can be formed into almost any shape necessary.