What is the difference between 6061-O and 6061-T6 aluminum sheet?

6061-O aluminum sheet and 6061-T6 aluminum sheet are two common specifications of aluminum sheets in the 6000 series 6061. They have better characteristics. What is the difference between 6061-O and 6061-T6 aluminum sheets? The main difference between 6061-O and 6061-T6 aluminum plates is their mechanical properties, especially strength and hardness, which are affected by the tempering process.

6061-O aluminum plate:

Temper: O (annealed)

Mechanical behavior:
Tensile Strength: Typically approximately 124 MPa (18 ksi)
Yield Strength: Typically approximately 55 MPa (8 ksi)
Elongation: usually around 25%
Hardness: lower
Formability: Excellent formability due to its softness. It can be molded, bent, and molded easily without cracking or weakening.

Typical uses:
Typically used in applications where high strength is not a critical requirement but formability and corrosion resistance are critical.
Ideal for applications requiring deep drawing or forming processes such as automotive parts, cans and kitchenware.

6061-T6 aluminum plate:

Condition: T6 (solution heat treatment and artificial aging)
Mechanical behavior:
Tensile Strength: Typically approximately 310 MPa (45 ksi)
Yield Strength: Typically approximately 275 MPa (40 ksi)
Elongation: usually around 12%
Hardness: Harder compared to 6061-O due to precipitation hardening process.
Formability: Although still formable, 6061-T6 is less ductile than 6061-O due to increased strength and hardness. It may require more force to bend or form.

Typical uses:
Structural applications requiring high strength and good corrosion resistance, such as aerospace components, bicycle frames and structural components in construction.
Machined components requiring high strength and excellent machining properties.

Comparison Table: