Temper Designation
The suffix after an aluminium alloy number — T3, T351, T651, T7451 — stating how it was worked and aged.
7075-T651 and 7075-T7351 are the same alloy with different lives: T651 is peak strength, T7351 is overaged for stress corrosion resistance at a strength penalty. Ordering “7075 plate” without a temper means the supplier chooses, and a part machined from the wrong temper can pass dimensional inspection and fail in service. The temper belongs on the purchase order and on the certificate.
Related terms
Where this applies
aerospace-plates
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