Aluminum 5070-O (Annealed)
Temper
AA 5070 · EN AlMg4MnZn
Maximum formability for deep drawing, bending and spinning; lowest strength.
Values for the O condition
Other 5070 tempers and conditions
5070 is listed in 11 conditions; see the grade overview at 5070.
Compare all 11 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
OThis page Annealed | Maximum formability for deep drawing, bending and spinning; lowest strength. | 130 | 275 | 22 | 70 HB | 29 % IACS |
Strain hardened from hot working only | Thick hot-rolled plate and extrusions where only minimum guaranteed properties are needed. | 140 | 280 | 16 | 73 HB | 29 % IACS |
H111Default Slightly strain hardened | Standard stocked plate/sheet condition: near-annealed formability with slightly higher proof strength from straightening/levelling. | 150 | 290 | 17 | 75 HB | 29 % IACS |
Strain hardened, quarter hard | Cold-rolled quarter-hard sheet supplied without stabilizing anneal; use where age-softening is acceptable. | 210 | 300 | 12 | 84 HB | 29 % IACS |
Strain hardened and stabilized, quarter hard | General-purpose semi-hard sheet: good balance of formability and strength for tanks and structures. | 215 | 305 | 12 | 85 HB | 29 % IACS |
Strain hardened, corrosion-resistant marine temper | Marine hull and offshore plate: strength of H32 plus ASTM G66/G67 qualified resistance to exfoliation and intergranular attack. | 220 | 310 | 12 | 87 HB | 29 % IACS |
Strain hardened and stabilized, marine temper | Equivalent strength to H116 with a thermal stabilization step; specified for shipbuilding and cryogenic/LNG structures. | 220 | 310 | 12 | 87 HB | 29 % IACS |
Strain hardened, half hard | Cold-rolled half-hard sheet for flat, lightly formed components. | 255 | 335 | 9 | 94 HB | 29 % IACS |
Strain hardened and stabilized, half hard | Higher strength sheet for lightly formed panels, treadplate and vessel walls. | 260 | 340 | 9 | 95 HB | 29 % IACS |
Strain hardened and stabilized, three-quarter hard | Stiff, high-strength thin sheet and coil for lightly bent or roll-formed parts. | 290 | 360 | 7 | 100 HB | 29 % IACS |
Strain hardened and stabilized, full hard | Maximum strain-hardened strength for flat parts with minimal forming; lowest ductility. | 315 | 380 | 6 | 105 HB | 29 % IACS |
What is 5070-O?
5070-O is 5070 in the O temper — maximum formability for deep drawing, bending and spinning; lowest strength. 5070-O has a yield strength of 130 MPa (18.9 ksi) and a tensile strength of 275 MPa (39.9 ksi) — weaker than 73% of aluminum grades. Elongation at break is 22% and the elastic modulus is 70.5 GPa (10.2 Msi). 5070-O has a density of 2.66 g/cm³ (0.0961 lb/in³), lighter than 84% of aluminum grades. It melts at 575°C (1,067 °F). H111 is the default condition FabDigit quotes; O is available on request or by drawing note.
Advantages
- Good corrosion resistance — 80/100, better than 97% of aluminum grades
- Tough — resists crack growth — 38 MPa·√m (34.6 ksi·√in), better than 96% of aluminum grades
- Ductile — tolerates forming and impact — 22%, better than 91% of aluminum grades
- Forms and bends easily — 85/100, better than 91% of aluminum grades
- Readily welded — 90/100, better than 90% of aluminum grades
Limitations
- Limited service temperature — 65°C (149 °F), worse than 97% of aluminum grades
- Difficult to machine — 35/100, worse than 86% of aluminum grades
- Poor heat conductor — 119 W/m·K (68.8 BTU/hr·ft·°F), worse than 81% of aluminum grades
- Low electrical conductivity — 29 % IACS, worse than 78% of aluminum grades
5070-O properties
Typical room-temperature values for 5070-O; 22 are specific to this condition. Other listed values are 5070 reference data and may not represent this condition. Bars are the position among aluminum grades.
Physical3
5070-O has a density of 2.66 g/cm³ (0.0961 lb/in³), lighter than 84% of aluminum grades. It melts at 575°C (1,067 °F).
Mechanical16
5070-O has a yield strength of 130 MPa (18.9 ksi) and a tensile strength of 275 MPa (39.9 ksi) — weaker than 73% of aluminum grades. Elongation at break is 22% and the elastic modulus is 70.5 GPa (10.2 Msi).
Thermal6
5070-O is rated for continuous service to 65°C (149 °F). It conducts heat at 119 W/m·K (68.8 BTU/hr·ft·°F), worse than 81% of aluminum grades. Thermal expansion is 24 µm/m·K (13.3 µin/in·°F).
Electrical3
5070-O conducts electricity at 29 % IACS, worse than 78% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is very good (80/100), better than 97% of aluminum grades.
Sustainability4
Producing a kilogram of 5070-O takes about 200 MJ of energy and emits 12.5 kg of CO₂ — less than 60% of aluminum grades. Typical recycled content is 35%.
Manufacturability8
5070-O's machinability is fair (35/100, worse than 86% of aluminum grades); weldability excellent (90/100); formability excellent (85/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 5070-O
Is 5070 easy to machine?
Machines like other Al-Mg alloys: use sharp polished high-rake carbide, high speed and generous coolant to avoid built-up edge and stringy chips; harder H3x tempers cut cleaner than O.
Can 5070 be welded?
Excellent GMAW/GTAW and FSW weldability with 5183/5356 filler; HAZ softens back toward the annealed strength, so design joints on O/H111 properties.
Can 5070 be formed, bent or molded?
Form in O/H111 for tight bends; watch for Lüders (stretcher-strain) marks on annealed sheet and increase bend radii sharply in H34–H38.
What surface finishes work on 5070?
Takes good clear or hard sulfuric anodizing and marine paint systems; mechanically polished surfaces stay slightly satin, and etch/anodize contrast can vary with Mn-Fe intermetallics.
5070 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 |
|---|---|---|
| Siimpurity limit | ≤ 0.25 | 0.1 |
| Feimpurity limit | ≤ 0.35 | 0.2 |
| Cukept low for corrosion resistance | ≤ 0.1 | 0.03 |
| Mngrain-structure control | 0.2 – 0.7 | 0.45 |
| Mgprincipal solid-solution strengthener | 3.6 – 4.6 | 4 |
| Cr | ≤ 0.3 | 0.1 |
| Zndeliberate addition for extra strength | 0.3 – 0.9 | 0.55 |
| Tigrain refiner | ≤ 0.15 | 0.03 |
| Zrrecrystallization control (when added) | ≤ 0.2 | 0.1 |
| Others (each) | ≤ 0.05 | — |
| Others (total) | ≤ 0.15 | — |
| Al | balance | — |
5070-O — frequently asked
What is 5070-O used for?
5070-O is typically used for marine structural sheet, welded hull and superstructure plate, boat deck and bulkhead panels, storage tank shells, truck and trailer body panels and welded structural fabrications. In short: zn-modified 5000-series sheet; higher strength than 5754; marine welded fabrication.
What is the yield strength of 5070-O?
5070-O has a typical yield strength of 130 MPa (18.9 ksi) and a tensile strength of 275 MPa (39.9 ksi) — weaker than 73% of aluminum grades. Strength varies by condition: see the 11 listed tempers.
Is 5070-O easy to machine?
Not especially — machinability is rated fair (35/100, worse than 86% of aluminum grades). Machines like other Al-Mg alloys: use sharp polished high-rake carbide, high speed and generous coolant to avoid built-up edge and stringy chips; harder H3x tempers cut cleaner than O.
Can 5070-O be welded?
Yes — weldability is rated excellent (90/100). Excellent GMAW/GTAW and FSW weldability with 5183/5356 filler; HAZ softens back toward the annealed strength, so design joints on O/H111 properties.
What surface finishes work on 5070-O?
Takes good clear or hard sulfuric anodizing and marine paint systems; mechanically polished surfaces stay slightly satin, and etch/anodize contrast can vary with Mn-Fe intermetallics.
Can 5070-O be formed, bent or molded?
Form in O/H111 for tight bends; watch for Lüders (stretcher-strain) marks on annealed sheet and increase bend radii sharply in H34–H38.
What is the maximum service temperature of 5070-O?
5070-O is rated for continuous use to about 65°C (149 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 5070-H111 and 5070-H38?
H111 is the default condition — standard stocked plate/sheet condition: near-annealed formability with slightly higher proof strength from straightening/levelling. H38: maximum strain-hardened strength for flat parts with minimal forming; lowest ductility. Yield strength is 150 MPa in H111 versus 315 MPa in H38.
Sources
- International Alloy Designations and Chemical Composition Limits for Wrought Aluminum (Teal Sheets) — The Aluminum Association (2018)
- EN 485-2 Aluminium and aluminium alloys — Sheet, strip and plate — Mechanical properties — CEN (2016)
- ASTM B209 / B928 — Aluminum-Alloy Sheet and Plate; High-Magnesium Marine Plate — ASTM International (2021)
- ASM Handbook Vol.2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- Aluminum: Properties and Physical Metallurgy (Hatch) — ASM International (1984)
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.