Aluminum 1050A-O (Annealed)
Temper
AA 1050A · EN AW-1050A, Al99.5 · BS 1B
Maximum ductility for deep drawing, spinning, roll forming and complex bending.
Values for the O condition
Other 1050A tempers and conditions
1050A is listed in 13 conditions; see the grade overview at 1050A.
Compare all 13 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
OThis page Annealed | Maximum ductility for deep drawing, spinning, roll forming and complex bending. | 28 | 78 | 40 | 20 HB | 61.8 % IACS |
Slightly strain hardened | Near-O condition arising from levelling/straightening after annealing; use where O-temper properties are wanted on flattened coil or plate. | 32 | 80 | 35 | 21 HB | 61.5 % IACS |
Strain hardened from hot working only | Hot-rolled plate or extrusion with guaranteed minima; the usual temper for thick 1050A plate. | 40 | 85 | 28 | 23 HB | 61.5 % IACS |
As fabricated | Hot-rolled/extruded stock with no mechanical property guarantee; pick for downstream forming or remelt-tolerant parts. | 45 | 90 | 25 | 22 HB | 61.5 % IACS |
Strain hardened and partially annealed, quarter hard | Back-annealed 1/4-hard temper: same strength class as H12 but with better bend ductility and stability. | 70 | 100 | 14 | 26 HB | 61.3 % IACS |
Strain hardened, quarter hard | Light cold work for a small strength gain while keeping good bendability. | 80 | 100 | 12 | 26 HB | 61.2 % IACS |
Strain hardened and partially annealed, half hard | Most common half-hard temper for coil that must still be bent or profiled after slitting. | 90 | 115 | 10 | 30 HB | 61.1 % IACS |
H14Default Strain hardened, half hard | The default stock condition for 1050A sheet and coil: usable stiffness/flatness with enough ductility for bending and roll forming. | 105 | 115 | 8 | 30 HB | 61 % IACS |
Strain hardened and partially annealed, three-quarter hard | Three-quarter-hard back-annealed strip for profiled sheet needing higher strength with controlled bending. | 110 | 135 | 6 | 35 HB | 61 % IACS |
Strain hardened, three-quarter hard | Higher strength strip for shallow forming, stiffened panels and shutter/roofing profiles. | 125 | 135 | 5 | 35 HB | 61 % IACS |
Strain hardened and partially annealed, full hard | Full-hard back-annealed temper for thin strip/foil where H18 strength is wanted with slightly more consistent ductility. | 130 | 155 | 5 | 38 HB | 60.8 % IACS |
Strain hardened, full hard | Full-hard strip and foil stock: maximum strength and flatness, minimum bend ductility. | 145 | 155 | 4 | 39 HB | 60.8 % IACS |
Strain hardened, extra hard | Extra-hard thin strip, foil and drawn wire where maximum as-rolled strength and springback are required. | 165 | 175 | 3 | 42 HB | 60.5 % IACS |
What is 1050A-O?
1050A-O is 1050A in the O temper — maximum ductility for deep drawing, spinning, roll forming and complex bending. 1050A-O has a yield strength of 28 MPa (4.06 ksi) and a tensile strength of 78 MPa (11.3 ksi) — weaker than 98% of aluminum grades. Elongation at break is 40% and the elastic modulus is 69 GPa (10 Msi). 1050A-O has a density of 2.71 g/cm³ (0.0977 lb/in³), lighter than 54% of aluminum grades. It melts at 646°C (1,195 °F). H14 is the default condition FabDigit quotes; O is available on request or by drawing note.
Advantages
- Readily welded — 95/100, better than 99% of aluminum grades
- Ductile — tolerates forming and impact — 40%, better than 98% of aluminum grades
- High electrical conductivity — 61.8 % IACS, better than 98% of aluminum grades
- Conducts heat well — 231 W/m·K (133.5 BTU/hr·ft·°F), better than 97% of aluminum grades
- Forms and bends easily — 97/100, better than 97% of aluminum grades
Limitations
- Low strength — 28 MPa (4.06 ksi), worse than 98% of aluminum grades
- Difficult to machine — 25/100, worse than 96% of aluminum grades
1050A-O properties
Typical room-temperature values for 1050A-O; 15 are specific to this condition. Other listed values are 1050A reference data and may not represent this condition. Bars are the position among aluminum grades.
Physical3
1050A-O has a density of 2.71 g/cm³ (0.0977 lb/in³), lighter than 54% of aluminum grades. It melts at 646°C (1,195 °F).
Mechanical11
1050A-O has a yield strength of 28 MPa (4.06 ksi) and a tensile strength of 78 MPa (11.3 ksi) — weaker than 98% of aluminum grades. Elongation at break is 40% and the elastic modulus is 69 GPa (10 Msi).
Thermal6
1050A-O is rated for continuous service to 200°C (392 °F). It conducts heat at 231 W/m·K (133.5 BTU/hr·ft·°F), better than 97% of aluminum grades. Thermal expansion is 23.6 µm/m·K (13.1 µin/in·°F).
Electrical3
1050A-O conducts electricity at 61.8 % IACS, better than 98% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is very good (72/100), better than 83% of aluminum grades.
Sustainability4
Producing a kilogram of 1050A-O takes about 200 MJ of energy and emits 12.5 kg of CO₂ — less than 60% of aluminum grades. Typical recycled content is 15%.
Manufacturability8
1050A-O's machinability is poor (25/100, worse than 96% of aluminum grades); weldability excellent (95/100); formability excellent (97/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 1050A-O
Is 1050A easy to machine?
Very soft and gummy — use polished high-rake carbide tools, high surface speed, generous chip clearance and lubricating coolant to prevent built-up edge; harder H16–H19 tempers cut cleaner.
Can 1050A be welded?
Readily TIG/MIG welded with 1100/1188 or 4043 filler and resistance/friction-stir welded; the HAZ reverts to O-temper strength so design joints for annealed properties.
Can 1050A be formed, bent or molded?
Outstanding cold formability — deep drawing, metal spinning, roll forming and tight bends (near 0T in O temper); interanneal at 340–410 °C when severe multi-stage drawing is needed.
What surface finishes work on 1050A?
Takes bright, clear and dyed anodizing exceptionally well and can be chemically brightened for reflectors; also easy to chromate/conversion coat, paint or electropolish, but soft surfaces mar easily.
1050A 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.
| Element | Spec limit (wt %) |
|---|---|
| Si | ≤ 0.25 |
| Fe | ≤ 0.4 |
| Cu | ≤ 0.05 |
| Mn | ≤ 0.05 |
| Mg | ≤ 0.05 |
| Zn | ≤ 0.07 |
| Ti | ≤ 0.05 |
| Others (each)total others 0.03 max per EN 573-3 | ≤ 0.03 |
| Al99.50 % Al minimum | ≥ 99.5 (balance) |
1050A-O — frequently asked
What is 1050A-O used for?
1050A-O is typically used for cookware, spun components, lighting reflectors, chemical equipment and roofing sheet. In short: tighter-purity European 1050; very high cold formability; 61% IACS conductivity.
What is the yield strength of 1050A-O?
1050A-O has a typical yield strength of 28 MPa (4.06 ksi) and a tensile strength of 78 MPa (11.3 ksi) — weaker than 98% of aluminum grades. Strength varies by condition: see the 13 listed tempers.
Is 1050A-O easy to machine?
Not especially — machinability is rated poor (25/100, worse than 96% of aluminum grades). Very soft and gummy — use polished high-rake carbide tools, high surface speed, generous chip clearance and lubricating coolant to prevent built-up edge; harder H16–H19 tempers cut cleaner.
Can 1050A-O be welded?
Yes — weldability is rated excellent (95/100). Readily TIG/MIG welded with 1100/1188 or 4043 filler and resistance/friction-stir welded; the HAZ reverts to O-temper strength so design joints for annealed properties.
What surface finishes work on 1050A-O?
Takes bright, clear and dyed anodizing exceptionally well and can be chemically brightened for reflectors; also easy to chromate/conversion coat, paint or electropolish, but soft surfaces mar easily.
Can 1050A-O be formed, bent or molded?
Outstanding cold formability — deep drawing, metal spinning, roll forming and tight bends (near 0T in O temper); interanneal at 340–410 °C when severe multi-stage drawing is needed.
What is the maximum service temperature of 1050A-O?
1050A-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 1050A-H14 and 1050A-O?
H14 is the default condition — the default stock condition for 1050A sheet and coil: usable stiffness/flatness with enough ductility for bending and roll forming. O: maximum ductility for deep drawing, spinning, roll forming and complex bending. Yield strength is 105 MPa in H14 versus 28 MPa in O.
Sources
- EN 573-3 Aluminium and aluminium alloys — Chemical composition — CEN (2019)
- EN 485-2 Aluminium and aluminium alloys — Sheet, strip and plate: mechanical properties — CEN (2016)
- ASM Handbook Vol.2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- International Alloy Designations and Chemical Composition Limits (Teal Sheets) — The Aluminum Association (2018)
- EN AW-1050A rolled products datasheet — Constellium / Hydro (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.