Aluminum 2A50-O (Annealed)
Temper
GB 2A50
Softest condition for deep forming, straightening or re-machining before heat treatment.
Values for the O condition
Other 2A50 tempers and conditions
2A50 is listed in 6 conditions; see the grade overview at 2A50.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
OThis page Annealed | Softest condition for deep forming, straightening or re-machining before heat treatment. | 95 | 180 | 20 | 45 HB | 50 % IACS |
Strain hardened from hot working only | Stock condition of hot-forged or extruded semi-product supplied for later solution treatment. | 160 | 260 | 14 | 70 HB | 47 % IACS |
Solution heat treated and naturally aged | Choose when moderate strength with the best ductility after quenching is needed, or for forming before final ageing. | 200 | 320 | 18 | 75 HB | 34 % IACS |
T6, heat treated by the user | Use when parts are heat treated after forming/welding from O or H112 stock; properties equivalent to T6. | 300 | 395 | 11 | 98 HB | 40 % IACS |
T6Default Solution heat treated and artificially aged | Standard delivery condition for 2A50 forgings — peak strength and hardness for structural parts. | 310 | 400 | 12 | 100 HB | 40 % IACS |
T6, stress relieved by stretching | Pick for large forgings or plate that must stay dimensionally stable during heavy machining. | 315 | 400 | 11 | 100 HB | 40 % IACS |
What is 2A50-O?
2A50-O is 2A50 in the O temper — softest condition for deep forming, straightening or re-machining before heat treatment. 2A50-O has a yield strength of 95 MPa (13.8 ksi) and a tensile strength of 180 MPa (26.1 ksi) — weaker than 86% of aluminum grades. Elongation at break is 20% and the elastic modulus is 71 GPa (10.3 Msi). 2A50-O has a density of 2.75 g/cm³ (0.0994 lb/in³), heavier than 67% 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
- High service temperature — 200°C (392 °F), better than 90% of aluminum grades
- High electrical conductivity — 50 % IACS, better than 90% of aluminum grades
- Ductile — tolerates forming and impact — 20%, better than 89% of aluminum grades
- Conducts heat well — 190 W/m·K (109.8 BTU/hr·ft·°F), better than 89% of aluminum grades
- Forms and bends easily — 75/100, better than 86% of aluminum grades
Limitations
- Low strength — 95 MPa (13.8 ksi), worse than 86% of aluminum grades
- Needs corrosion protection — 35/100, worse than 85% of aluminum grades
- Difficult to weld — 25/100, worse than 76% of aluminum grades
2A50-O properties
Typical room-temperature values for 2A50-O; 11 are specific to this condition. Other listed values are 2A50 reference data and may not represent this condition. Bars are the position among aluminum grades.
Physical3
2A50-O has a density of 2.75 g/cm³ (0.0994 lb/in³), heavier than 67% of aluminum grades. It melts at 510°C (950 °F).
Mechanical12
2A50-O has a yield strength of 95 MPa (13.8 ksi) and a tensile strength of 180 MPa (26.1 ksi) — weaker than 86% of aluminum grades. Elongation at break is 20% and the elastic modulus is 71 GPa (10.3 Msi).
Thermal6
2A50-O is rated for continuous service to 200°C (392 °F). It conducts heat at 190 W/m·K (109.8 BTU/hr·ft·°F), better than 89% of aluminum grades. Thermal expansion is 22.5 µm/m·K (12.5 µin/in·°F).
Electrical3
2A50-O conducts electricity at 50 % IACS, better than 90% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is fair (35/100), worse than 85% of aluminum grades.
Sustainability4
Producing a kilogram of 2A50-O takes about 200 MJ of energy and emits 12.5 kg of CO₂ — less than 60% of aluminum grades. Typical recycled content is 25%.
Manufacturability8
2A50-O's machinability is fair (45/100, worse than 72% of aluminum grades); weldability poor (25/100); formability very good (75/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 2A50-O
Is 2A50 easy to machine?
Machines very well in T4/T6 with sharp carbide tooling, high speeds and flood coolant; gummy and prone to built-up edge in the O temper.
Can 2A50 be welded?
Poor fusion weldability (hot cracking, loss of aged strength) — join by riveting, bolting or friction/resistance welding rather than TIG/MIG.
Can 2A50 be formed, bent or molded?
Excellent hot forgeability at 420–470 °C, which is why it is a preferred die-forging alloy; cold forming should be done in O or T4 only.
What surface finishes work on 2A50?
Chromate/phosphate conversion coating, hard anodizing or primer+paint for corrosion protection; clear decorative anodizing gives an uneven grey tone due to Cu and Si.
2A50 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 |
|---|---|---|
| Si | 0.7 – 1.2 | 0.9 |
| Cu | 1.8 – 2.6 | 2.2 |
| Mg | 0.4 – 0.8 | 0.6 |
| Mn | 0.4 – 0.8 | 0.6 |
| Feimpurity limit | ≤ 0.7 | — |
| Znimpurity limit | ≤ 0.3 | — |
| Niimpurity limit | ≤ 0.1 | — |
| Tigrain refiner / impurity | ≤ 0.15 | — |
| Others (each)total 0.15 max | ≤ 0.05 | — |
| Al | balance | — |
2A50-O — frequently asked
What is 2A50-O used for?
2A50-O is typically used for die-forged engine brackets, forged wheel hubs, pump and gearbox housings, complex structural forgings, forged levers and control arms and machined fittings from forged blanks. In short: preferred 2000-series die-forging alloy; 2014-class strength; complex shapes hot forged.
What is the yield strength of 2A50-O?
2A50-O has a typical yield strength of 95 MPa (13.8 ksi) and a tensile strength of 180 MPa (26.1 ksi) — weaker than 86% of aluminum grades. Strength varies by condition: see the 6 listed tempers.
Is 2A50-O easy to machine?
Reasonably — machinability is rated fair (45/100, worse than 72% of aluminum grades). Machines very well in T4/T6 with sharp carbide tooling, high speeds and flood coolant; gummy and prone to built-up edge in the O temper.
Can 2A50-O be welded?
Not readily — weldability is rated poor (25/100). Poor fusion weldability (hot cracking, loss of aged strength) — join by riveting, bolting or friction/resistance welding rather than TIG/MIG.
What surface finishes work on 2A50-O?
Chromate/phosphate conversion coating, hard anodizing or primer+paint for corrosion protection; clear decorative anodizing gives an uneven grey tone due to Cu and Si.
Can 2A50-O be formed, bent or molded?
Excellent hot forgeability at 420–470 °C, which is why it is a preferred die-forging alloy; cold forming should be done in O or T4 only.
What is the maximum service temperature of 2A50-O?
2A50-O is rated for continuous use to about 200°C (392 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 2A50-T6 and 2A50-O?
T6 is the default condition — standard delivery condition for 2A50 forgings — peak strength and hardness for structural parts. O: softest condition for deep forming, straightening or re-machining before heat treatment. Yield strength is 310 MPa in T6 versus 95 MPa in O.
Sources
- ASM Handbook Vol.2 — Properties and Selection: Nonferrous Alloys (2014 alloy data) — ASM International (1990)
- MMPDS-typical values for 2014 forgings — Battelle/FAA (2022)
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.