Aluminum 1100A-O (Annealed)
Temper
AA 1100A · EN AW-1100A
Pick for maximum ductility: deep drawing, spinning, hand forming, foil and fin stock.
Values for the O condition
Other 1100A tempers and conditions
1100A is listed in 9 conditions; see the grade overview at 1100A.
Compare all 9 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
OThis page Annealed | Pick for maximum ductility: deep drawing, spinning, hand forming, foil and fin stock. | 34 | 90 | 40 | 23 HB | 59 % IACS |
Strain hardened from hot working only | Pick for hot-rolled plate, extrusions and thick sections where only modest strength above annealed is needed. | 45 | 95 | 25 | 25 HB | 59 % IACS |
Strain hardened and partially annealed, quarter hard | Pick when H12 strength is wanted with more uniform ductility and less springback after forming. | 95 | 110 | 14 | 27 HB | 58 % IACS |
Strain hardened, quarter hard | Pick when annealed sheet is too limp but full forming ductility must be kept. | 105 | 110 | 12 | 28 HB | 57 % IACS |
Strain hardened and partially annealed, half hard | Pick for H14-level strength in deep-drawn or roll-formed parts where cracking risk must be lower. | 105 | 125 | 12 | 31 HB | 57 % IACS |
H14Default Strain hardened, half hard | Default stock condition: best all-round balance of stiffness in handling, bendability and price for sheet and coil. | 115 | 125 | 9 | 32 HB | 57 % IACS |
Strain hardened and partially annealed, three-quarter hard | Pick for higher-strength strip/coil that still needs moderate bending, e.g. shutters, fin and closure stock. | 130 | 145 | 8 | 36 HB | 57 % IACS |
Strain hardened, three-quarter hard | Pick for flat panels, shields and stampings needing more stiffness with only mild bending. | 140 | 145 | 6 | 38 HB | 57 % IACS |
Strain hardened, full hard | Pick for maximum strength/hardness in pure aluminium — flat strip, foil stock, blanking parts with little forming. | 150 | 165 | 5 | 44 HB | 57 % IACS |
What is 1100A-O?
1100A-O is 1100A in the O temper — pick for maximum ductility: deep drawing, spinning, hand forming, foil and fin stock. 1100A-O has a yield strength of 34 MPa (4.93 ksi) and a tensile strength of 90 MPa (13.1 ksi) — weaker than 97% of aluminum grades. Elongation at break is 40% and the elastic modulus is 69 GPa (10 Msi). 1100A-O has a density of 2.71 g/cm³ (0.0979 lb/in³), heavier than 51% of aluminum grades. It melts at 643°C (1,189 °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
- Forms and bends easily — 98/100, better than 98% of aluminum grades
- Good corrosion resistance — 80/100, better than 97% of aluminum grades
- High electrical conductivity — 59 % IACS, better than 95% of aluminum grades
Limitations
- Low strength — 34 MPa (4.93 ksi), worse than 97% of aluminum grades
- Difficult to machine — 28/100, worse than 94% of aluminum grades
1100A-O properties
Typical room-temperature values for 1100A-O; 16 are specific to this condition. Other listed values are 1100A reference data and may not represent this condition. Bars are the position among aluminum grades.
Physical3
1100A-O has a density of 2.71 g/cm³ (0.0979 lb/in³), heavier than 51% of aluminum grades. It melts at 643°C (1,189 °F).
Mechanical11
1100A-O has a yield strength of 34 MPa (4.93 ksi) and a tensile strength of 90 MPa (13.1 ksi) — weaker than 97% of aluminum grades. Elongation at break is 40% and the elastic modulus is 69 GPa (10 Msi).
Thermal6
1100A-O is rated for continuous service to 200°C (392 °F). It conducts heat at 222 W/m·K (128.3 BTU/hr·ft·°F), better than 94% of aluminum grades. Thermal expansion is 23.6 µm/m·K (13.1 µin/in·°F).
Electrical3
1100A-O conducts electricity at 59 % IACS, better than 95% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is very good (80/100), better than 97% of aluminum grades.
Sustainability4
Producing a kilogram of 1100A-O takes about 200 MJ of energy and emits 11.5 kg of CO₂ — less than 60% of aluminum grades. Typical recycled content is 30%.
Manufacturability7
1100A-O's machinability is poor (28/100, worse than 94% of aluminum grades); weldability excellent (95/100); formability excellent (98/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 1100A-O
Is 1100A easy to machine?
Very gummy in O/H12 — use polished high-rake carbide, high surface speed, sharp tools and flood lubricant; H18 chips break better and gives cleaner threads.
Can 1100A be welded?
Excellent with GTAW/GMAW using ER1100 (or ER4043 for crack-sensitive joints), resistance and brazing; weld metal reverts to near-annealed strength.
Can 1100A be formed, bent or molded?
Outstanding cold formability — deep draw, spin, roll-form and hem in O/H12; interanneal at 340–415 °C when heavy redrawing is needed.
What surface finishes work on 1100A?
Takes bright and clear sulfuric anodizing, chemical conversion coating, paint and electroplating well; too soft for wear-resistant hard anodize, and mechanical polishing needs light pressure to avoid smearing.
1100A 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+Fecombined limit per EN 573-3 / AA registration | ≤ 0.95 | — |
| Cuintentional addition, raises strength slightly | 0.05 – 0.2 | 0.12 |
| Mn | ≤ 0.05 | — |
| Zn | ≤ 0.1 | — |
| Ticounted with 'others' in some registrations | ≤ 0.05 | — |
| Others (each)total others 0.15 max; 1100A applies slightly tightened impurity control vs 1100 | ≤ 0.05 | — |
| Al | ≥ 99 (balance) | — |
1100A-O — frequently asked
What is 1100A-O used for?
1100A-O is typically used for kitchenware, chemical tanks and general sheet metal fabrication. In short: general-purpose pure aluminum; weldability score 95; slightly stronger than 1050A.
What is the yield strength of 1100A-O?
1100A-O has a typical yield strength of 34 MPa (4.93 ksi) and a tensile strength of 90 MPa (13.1 ksi) — weaker than 97% of aluminum grades. Strength varies by condition: see the 9 listed tempers.
Is 1100A-O easy to machine?
Not especially — machinability is rated poor (28/100, worse than 94% of aluminum grades). Very gummy in O/H12 — use polished high-rake carbide, high surface speed, sharp tools and flood lubricant; H18 chips break better and gives cleaner threads.
Can 1100A-O be welded?
Yes — weldability is rated excellent (95/100). Excellent with GTAW/GMAW using ER1100 (or ER4043 for crack-sensitive joints), resistance and brazing; weld metal reverts to near-annealed strength.
What surface finishes work on 1100A-O?
Takes bright and clear sulfuric anodizing, chemical conversion coating, paint and electroplating well; too soft for wear-resistant hard anodize, and mechanical polishing needs light pressure to avoid smearing.
Can 1100A-O be formed, bent or molded?
Outstanding cold formability — deep draw, spin, roll-form and hem in O/H12; interanneal at 340–415 °C when heavy redrawing is needed.
What is the maximum service temperature of 1100A-O?
1100A-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 1100A-H14 and 1100A-O?
H14 is the default condition — default stock condition: best all-round balance of stiffness in handling, bendability and price for sheet and coil. O: pick for maximum ductility: deep drawing, spinning, hand forming, foil and fin stock. Yield strength is 115 MPa in H14 versus 34 MPa in O.
Sources
- EN 573-3 / EN 485-2 — wrought aluminium chemical composition and sheet properties — CEN (2019)
- ASTM B209 / B209M — Aluminum and Aluminum-Alloy Sheet and Plate — ASTM (2021)
- International Alloy Designations and Chemical Composition Limits (Teal Sheets) — The Aluminum Association (2018)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- Aluminum Standards and Data — The Aluminum Association (2017)
- MMPDS typical property tables for 1100 sheet — 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.