6025-H21 Aluminum
6025-H21 aluminum is 6025 aluminum in the H21 temper. To achieve this temper, the metal is strain hardened, and then partially annealed, to a strength that is roughly 1/8 of the way between annealed (O) and full-hard (H28).
It has the second highest ductility compared to the other variants of 6025 aluminum.
The graph bars on the material properties cards below compare 6025-H21 aluminum to: 6000-series alloys (top), all aluminum alloys (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.
Mechanical Properties
Elastic (Young's, Tensile) Modulus
70 GPa 10 x 106 psi
Elongation at Break
5.1 %
Fatigue Strength
88 MPa 13 x 103 psi
Poisson's Ratio
0.33
Shear Modulus
26 GPa 3.8 x 106 psi
Shear Strength
110 MPa 16 x 103 psi
Tensile Strength: Ultimate (UTS)
190 MPa 28 x 103 psi
Tensile Strength: Yield (Proof)
110 MPa 16 x 103 psi
Thermal Properties
Latent Heat of Fusion
410 J/g
Maximum Temperature: Mechanical
160 °C 330 °F
Melting Completion (Liquidus)
650 °C 1190 °F
Melting Onset (Solidus)
550 °C 1030 °F
Specific Heat Capacity
900 J/kg-K 0.21 BTU/lb-°F
Thermal Conductivity
130 W/m-K 77 BTU/h-ft-°F
Thermal Expansion
23 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
33 % IACS
Electrical Conductivity: Equal Weight (Specific)
110 % IACS
Otherwise Unclassified Properties
Base Metal Price
9.5 % relative
Density
2.8 g/cm3 170 lb/ft3
Embodied Carbon
8.5 kg CO2/kg material
Embodied Energy
150 MJ/kg 65 x 103 BTU/lb
Embodied Water
1160 L/kg 140 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
8.4 MJ/m3
Resilience: Unit (Modulus of Resilience)
91 kJ/m3
Stiffness to Weight: Axial
14 points
Stiffness to Weight: Bending
50 points
Strength to Weight: Axial
19 points
Strength to Weight: Bending
27 points
Thermal Diffusivity
54 mm2/s
Thermal Shock Resistance
8.4 points
Alloy Composition
| Al | 91.7 to 96.3 | |
| Mg | 2.1 to 3.0 | |
| Si | 0.8 to 1.5 | |
| Mn | 0.6 to 1.4 | |
| Cu | 0.2 to 0.7 | |
| Fe | 0 to 0.7 | |
| Zn | 0 to 0.5 | |
| Cr | 0 to 0.2 | |
| Ti | 0 to 0.2 | |
| res. | 0 to 0.15 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Further Reading
Handbook of Aluminum vol. 2: Alloy Production and Materials Manufacturing, George Totten and D. Scott MacKenzie (editors), 2003
EN 485-2: Aluminium and aluminium alloys. Sheet, strip and plate. Mechanical properties
ISO 6361-2: Wrought aluminium and aluminium alloys - Sheets, strips and plates - Part 2: Mechanical properties
EN 573-3: Aluminium and aluminium alloys. Chemical composition and form of wrought products. Chemical composition and form of products