Aluminum 2A17-O (Annealed)
Temper
GB 2A17
Softest condition for deep forming, bending or straightening before heat treatment.
Values for the O condition
Other 2A17 tempers and conditions
2A17 is listed in 6 conditions; see the grade overview at 2A17.
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, bending or straightening before heat treatment. | 95 | 210 | 18 | 48 HB | 45 % IACS |
Strain hardened from hot working only | Mill-supplied hot-worked stock intended for subsequent solution treatment and ageing. | 150 | 260 | 14 | 65 HB | 42 % IACS |
Solution heat treated and naturally aged | Pick when moderate strength with better ductility/formability is needed before final artificial ageing. | 235 | 380 | 14 | 100 HB | 30 % IACS |
T6, heat treated by the user | For parts formed or welded in the soft state and then fully heat treated to T6-level strength. | 310 | 430 | 8 | 116 HB | 35 % IACS |
T6, stress relieved by stretching | Choose for thick plate or bar that will be heavily machined and must stay dimensionally stable. | 315 | 430 | 8 | 118 HB | 35 % IACS |
T6Default Solution heat treated and artificially aged | Standard supply and service condition: peak strength plus retained strength at 200–300 °C. | 320 | 440 | 9 | 120 HB | 35 % IACS |
What is 2A17-O?
2A17-O is 2A17 in the O temper — softest condition for deep forming, bending or straightening before heat treatment. 2A17-O has a yield strength of 95 MPa (13.8 ksi) and a tensile strength of 210 MPa (30.5 ksi) — weaker than 86% of aluminum grades. Elongation at break is 18% and the elastic modulus is 72 GPa (10.4 Msi). 2A17-O has a density of 2.84 g/cm³ (0.103 lb/in³), heavier than 93% of aluminum grades. It melts at 540°C (1,004 °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
- Ductile — tolerates forming and impact — 18%, better than 86% of aluminum grades
- High electrical conductivity — 45 % IACS, better than 86% of aluminum grades
- Forms and bends easily — 70/100, better than 83% of aluminum grades
- Conducts heat well — 165 W/m·K (95.3 BTU/hr·ft·°F), better than 79% of aluminum grades
Limitations
- Needs corrosion protection — 30/100, worse than 98% of aluminum grades
- Low strength — 95 MPa (13.8 ksi), worse than 86% of aluminum grades
2A17-O properties
Typical room-temperature values for 2A17-O; 10 are specific to this condition. Other listed values are 2A17 reference data and may not represent this condition. Bars are the position among aluminum grades.
Physical3
2A17-O has a density of 2.84 g/cm³ (0.103 lb/in³), heavier than 93% of aluminum grades. It melts at 540°C (1,004 °F).
Mechanical13
2A17-O has a yield strength of 95 MPa (13.8 ksi) and a tensile strength of 210 MPa (30.5 ksi) — weaker than 86% of aluminum grades. Elongation at break is 18% and the elastic modulus is 72 GPa (10.4 Msi).
Thermal6
2A17-O is rated for continuous service to 200°C (392 °F). It conducts heat at 165 W/m·K (95.3 BTU/hr·ft·°F), better than 79% of aluminum grades. Thermal expansion is 22.6 µm/m·K (12.6 µin/in·°F).
Electrical3
2A17-O conducts electricity at 45 % IACS, better than 86% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is poor (30/100), worse than 98% of aluminum grades.
Sustainability4
Producing a kilogram of 2A17-O takes about 200 MJ of energy and emits 12.5 kg of CO₂ — less than 60% of aluminum grades. Typical recycled content is 10%.
Manufacturability8
2A17-O's machinability is fair (45/100, worse than 72% of aluminum grades); weldability good (58/100); formability very good (70/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 2A17-O
Is 2A17 easy to machine?
Machines well in T6 with sharp carbide tools, high speeds and flood coolant; gummy and prone to built-up edge in O/T4.
Can 2A17 be welded?
One of the more fusion-weldable 2000-series grades (TIG/MIG with Al-Cu or Al-Si-free Cu-bearing filler); expect strength loss in the HAZ unless re-solution treated and aged (T62).
Can 2A17 be formed, bent or molded?
Form in O or freshly quenched T4 (within a few hours); T6 material has low ductility and needs generous bend radii or hot forming at 200–300 °C.
What surface finishes work on 2A17?
Anodizes to a dull, darker film because of high Cu; use chromic/sulfuric anodize plus chromate-free primer, or clad sheet, for corrosion protection.
2A17 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 |
|---|---|---|
| Cuprimary strengthening element | 6 – 7 | 6.5 |
| Mndispersoid for high-temperature stability | 0.4 – 0.8 | 0.6 |
| Mgdistinguishes 2A17 from 2A16 | 0.25 – 0.45 | 0.35 |
| Tigrain refinement | 0.1 – 0.2 | 0.15 |
| Siimpurity limit | ≤ 0.3 | — |
| Feimpurity limit | ≤ 0.3 | — |
| Znimpurity limit | ≤ 0.1 | — |
| Niimpurity limit | ≤ 0.1 | — |
| Other (each)others total ≤ 0.15 | ≤ 0.05 | — |
| Al | balance | — |
2A17-O — frequently asked
What is 2A17-O used for?
2A17-O is typically used for high-temperature structural parts, engine components, airframe structure near heat sources, forged and machined hot-zone fittings, heat-resistant plate for brackets and welded elevated-temperature assemblies. In short: heat-resistant high-strength 2000 series; 440 MPa at 250 °C service; low formability, good machining.
What is the yield strength of 2A17-O?
2A17-O has a typical yield strength of 95 MPa (13.8 ksi) and a tensile strength of 210 MPa (30.5 ksi) — weaker than 86% of aluminum grades. Strength varies by condition: see the 6 listed tempers.
Is 2A17-O easy to machine?
Reasonably — machinability is rated fair (45/100, worse than 72% of aluminum grades). Machines well in T6 with sharp carbide tools, high speeds and flood coolant; gummy and prone to built-up edge in O/T4.
Can 2A17-O be welded?
Yes — weldability is rated good (58/100). One of the more fusion-weldable 2000-series grades (TIG/MIG with Al-Cu or Al-Si-free Cu-bearing filler); expect strength loss in the HAZ unless re-solution treated and aged (T62).
What surface finishes work on 2A17-O?
Anodizes to a dull, darker film because of high Cu; use chromic/sulfuric anodize plus chromate-free primer, or clad sheet, for corrosion protection.
Can 2A17-O be formed, bent or molded?
Form in O or freshly quenched T4 (within a few hours); T6 material has low ductility and needs generous bend radii or hot forming at 200–300 °C.
What is the maximum service temperature of 2A17-O?
2A17-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 2A17-T6 and 2A17-O?
T6 is the default condition — standard supply and service condition: peak strength plus retained strength at 200–300 °C. O: softest condition for deep forming, bending or straightening before heat treatment. Yield strength is 320 MPa in T6 versus 95 MPa in O.
Sources
- ASM Handbook Vol.2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- ASM Handbook Vol.13B — Corrosion: Materials — ASM International (2005)
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.