Aluminum 2A80-O (Annealed)
Temper
GB 2A80
Pick the annealed intermediate state for forging and machining when maximum plasticity (18% elongation, 60 HB) is needed for secondary forming before solution treatment and ageing.
Values for the O condition
Other 2A80 tempers and conditions
2A80 is listed in 5 conditions; see the grade overview at 2A80.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
OThis page Annealed | Pick the annealed intermediate state for forging and machining when maximum plasticity (18% elongation, 60 HB) is needed for secondary forming before solution treatment and ageing. | 90 | 180 | 18 | 60 HB | 46 % IACS |
As fabricated | Use as-forged or hot-extruded stock only as a blank for subsequent heat treatment and machining; at 155 MPa yield and 12% elongation it is not intended for load-bearing service. | 155 | 275 | 12 | 80 HB | 44 % IACS |
T6 variant, underaged | Choose the solution treated and under-aged temper when complex high-temperature forgings need extra ductility and toughness (11% elongation) at a strength trade-off down to 340 MPa yield. | 340 | 420 | 11 | 115 HB | 41 % IACS |
T6, stress relieved by compression | Pick for large open-die or closed-die forgings: compression stress relief between solution treatment and artificial ageing cuts machining distortion and residual-stress cracking, with 7% elongation. | 370 | 430 | 7 | 122 HB | 40 % IACS |
T6Default Solution heat treated and artificially aged | Specify solution heat treated and artificially aged material for pistons, impellers and hot-running forgings needing the best strength/heat resistance mix (380 MPa yield, 200 °C); elongation drops to 8%. | 380 | 440 | 8 | 125 HB | 40 % IACS |
What is 2A80-O?
2A80-O is 2A80 in the O temper — pick the annealed intermediate state for forging and machining when maximum plasticity (18% elongation, 60 HB) is needed for secondary forming before solution treatment and ageing. 2A80-O has a yield strength of 90 MPa (13.1 ksi) and a tensile strength of 180 MPa (26.1 ksi) — weaker than 87% of aluminum grades. Elongation at break is 18% and the elastic modulus is 73 GPa (10.6 Msi). 2A80-O has a density of 2.8 g/cm³ (0.101 lb/in³), heavier than 81% of aluminum grades. It melts at 510°C (950 °F). T6 is the default condition FabDigit quotes; O is available on request or by drawing note.
Advantages
- Tough — resists crack growth — 34 MPa·√m (30.9 ksi·√in), better than 90% of aluminum grades
- High electrical conductivity — 46 % IACS, better than 87% of aluminum grades
- Ductile — tolerates forming and impact — 18%, better than 86% of aluminum grades
- Conducts heat well — 170 W/m·K (98.2 BTU/hr·ft·°F), better than 82% of aluminum grades
Limitations
- Low strength — 90 MPa (13.1 ksi), worse than 87% of aluminum grades
- Limited service temperature — 120°C (248 °F), worse than 79% of aluminum grades
- Needs corrosion protection — 38/100, worse than 79% of aluminum grades
2A80-O properties
Typical room-temperature values for 2A80-O; 22 are specific to this condition. Other listed values are 2A80 reference data and may not represent this condition. Bars are the position among aluminum grades.
Physical3
2A80-O has a density of 2.8 g/cm³ (0.101 lb/in³), heavier than 81% of aluminum grades. It melts at 510°C (950 °F).
Mechanical12
2A80-O has a yield strength of 90 MPa (13.1 ksi) and a tensile strength of 180 MPa (26.1 ksi) — weaker than 87% of aluminum grades. Elongation at break is 18% and the elastic modulus is 73 GPa (10.6 Msi).
Thermal6
2A80-O is rated for continuous service to 120°C (248 °F). It conducts heat at 170 W/m·K (98.2 BTU/hr·ft·°F), better than 82% of aluminum grades. Thermal expansion is 22.3 µm/m·K (12.4 µin/in·°F).
Electrical3
2A80-O conducts electricity at 46 % IACS, better than 87% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is fair (38/100), worse than 79% of aluminum grades.
Sustainability4
Producing a kilogram of 2A80-O takes about 205 MJ of energy and emits 12.5 kg of CO₂ — more than 76% of aluminum grades. Typical recycled content is 12%.
Manufacturability6
2A80-O's machinability is fair (50/100, worse than 65% of aluminum grades); weldability poor (30/100); formability good (55/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 2A80-O
Is 2A80 easy to machine?
Machinability in T6 is good, but the Fe/Ni/Si hard phases abrade tooling; use diamond or fine-grain carbide inserts, high spindle speeds, large rake angles and ample coolant.
Can 2A80 be welded?
Fusion weldability is poor, with hot cracking and a large drop in joint strength. Use bolted or riveted joints, friction welding or diffusion bonding, and re-solution treat and age after any welding.
Can 2A80 be formed, bent or molded?
Hot forging and die forging at about 420–470 °C work well. T6 is essentially not cold formable, so complete any bending in the O temper and heat treat afterwards.
What surface finishes work on 2A80?
Hard anodizing raises wear resistance on piston ring grooves and skirts. Decorative anodizing comes out dark; for outdoor or humid service use chromate conversion coating plus paint, or alclad protection.
2A80 chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| Sideliberate addition, improves forgeability and hot strength | 0.5 – 1.2 | 0.8 |
| Feforms heat-resistant Al9FeNi phase with Ni | 1 – 1.6 | 1.3 |
| Cu | 1.9 – 2.5 | 2.2 |
| Mnimpurity limit | ≤ 0.2 | — |
| Mg | 1.4 – 1.8 | 1.6 |
| Ni | 0.9 – 1.5 | 1.2 |
| Znimpurity limit | ≤ 0.3 | — |
| Tigrain refiner | ≤ 0.15 | — |
| Other (each)individual other impurity | ≤ 0.05 | — |
| Other (total)sum of other impurities | ≤ 0.15 | — |
| Al | balance | — |
2A80-O — frequently asked
What is 2A80-O used for?
2A80-O is typically used for forged engine pistons, compressor rotors and impellers, compressor housings, high-temperature engine forgings, turbocharger-adjacent brackets and machined hot-section fittings. In short: 2618A performance class; load-bearing to 200 °C; forge-and-machine only.
What is the yield strength of 2A80-O?
2A80-O has a typical yield strength of 90 MPa (13.1 ksi) and a tensile strength of 180 MPa (26.1 ksi) — weaker than 87% of aluminum grades. Strength varies by condition: see the 5 listed tempers.
Is 2A80-O easy to machine?
Reasonably — machinability is rated fair (50/100, worse than 65% of aluminum grades). Machinability in T6 is good, but the Fe/Ni/Si hard phases abrade tooling; use diamond or fine-grain carbide inserts, high spindle speeds, large rake angles and ample coolant.
Can 2A80-O be welded?
Not readily — weldability is rated poor (30/100). Fusion weldability is poor, with hot cracking and a large drop in joint strength. Use bolted or riveted joints, friction welding or diffusion bonding, and re-solution treat and age after any welding.
What surface finishes work on 2A80-O?
Hard anodizing raises wear resistance on piston ring grooves and skirts. Decorative anodizing comes out dark; for outdoor or humid service use chromate conversion coating plus paint, or alclad protection.
Can 2A80-O be formed, bent or molded?
Hot forging and die forging at about 420–470 °C work well. T6 is essentially not cold formable, so complete any bending in the O temper and heat treat afterwards.
What is the maximum service temperature of 2A80-O?
2A80-O is rated for continuous use to about 120°C (248 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 2A80-T6 and 2A80-O?
T6 is the default condition — specify solution heat treated and artificially aged material for pistons, impellers and hot-running forgings needing the best strength/heat resistance mix (380 MPa yield, 200 °C); elongation drops to 8%. O: pick the annealed intermediate state for forging and machining when maximum plasticity (18% elongation, 60 HB) is needed for secondary forming before solution treatment and ageing. Yield strength is 380 MPa in T6 versus 90 MPa in O.
Sources
- ASM Handbook Vol.2 — Properties of Aluminum Alloys (2618 analog) — ASM International (1990)
- MMPDS typical properties, 2618-T61 — Battelle/FAA (2021)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.