Aluminum Temper Designations
Release time:
Sep 26,2024
1. ALUMINUM TEMPER DESIGNATIONS
The temper designation follows the alloy code, separated by a hyphen, and indicates the material's condition:
-F As Fabricated: Refers to products formed by rolling or shaping without special control over thermal or work-hardening conditions. Since the mechanical properties can vary widely, no specific limits are assigned. This temper is typically applied to sheet products in intermediate production stages.
-H Strain-Hardened: Applies to wrought products that are strengthened through cold-rolling or cold-working processes.
-O Annealed: Refers to wrought products that have been heated above the recrystallization temperature, resulting in the lowest tensile strength condition for the alloy.
2. DESIGNATIONS OF THE –H STRAIN HARDENED TEMPERS
The First Digit
There are three methods used to achieve the final temper for strain-hardened materials:
–H1 Strain-Hardened Only: Refers to products that are strain-hardened to the desired strength level without any subsequent thermal treatment.
–H2 Strain-Hardened and Partially Annealed: Products are strain-hardened to a higher strength than needed, followed by a partial anneal (or “back anneal”) to reduce the strength to the desired level.
–H3 Strain-Hardened and Stabilized: This designation applies exclusively to magnesium-containing alloys that may gradually soften at room temperature after strain-hardening. A low-temperature anneal is used to stabilize the properties.
The Second Digit
The second digit indicates the degree of strain-hardening, reflecting the level of strength achieved.
-Hx2 | Quarter hard |
-Hx4 | Half hard |
-Hx6 | Three quarter |
-Hx8 | Full hard |
-Hx9 | Extra hard (the minimum tensile strength exceeds that of the Hx8 temper by 2 ksi or more) |
Hx1, Hx3, Hx5 and Hx7 tempers are intermediate between those defined above.
The mechanical property limits that correspond to each temper designation can be found by referring to an appropriate aluminum standard such as the Aluminum Association Standards and Data or ASTM B 209.
The Third Digit
A third digit is sometimes used to indicate a variation of the basic two-digit temper.
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