6061 Aluminum Tooling Plate (Alloy: 6061 T651) / Thickness: 1/4″ (0.25″) / Dimensions: 6″ x 12″ / Dimensional Tolerance: Thickness: +0.023″ / -0.000″, Cut Size: +0.120″ / -0.000″ / Tensile Strength: 45 kSI / Yield Strength: 40-42 kSI / Shear Strength: 31 kSI / Brinell Hardness: 95 / Alloy Composition (% of weight): Al 95.8-98.6, Cr 0.04-0.35, Fe 0.7 Max, Mg 0.8-1.2, Mn 0.15 Max, Si 0.4-0.8, Ti 0.15 Max, Zn 0.25 Max. Other elements not more than 0.05% each and every, 0.15% total.
Processing: Excellent Machinability, Weldability, and High Strength. Welding: 6061 may also be readily welded the use of the entire common welding techniques.
Forging: 6061 may also be forged at temperatures within the range of 750°F to 900°F. Hot working is also done within the temperature range of 500°F to 700°F.
Heat Treating: Solution heat treat at 990°F for adequate time to allow for thorough heating after which water quenched. Precipitation hardening is done at 320°F for 18 hours and air cool, followed by 350°F for 8 hours and air cooled.
Annealing: Must be done at 775°F for at 2 to 3 hours at temperature, followed by controlled cooling at 50°F per hour down to 500°F, then air cooled.
Aging: The aging precipitation heat remedy is done at 350°F for 8 hours, followed by air cooling. This produces the T6 temper.