Aluminum 7076
AA 7076 · UNS A97076
7076 is an older Zn-Mg-Cu wrought alloy (A97076) used historically for structural extrusions and forgings, and now largely replaced by 7075 and later 7000-series alloys.
Reference datasheet — 7076 is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the T61 condition
7076 tempers and conditions
7076 is supplied in 4 conditions, soft to hard. T61 is the default FabDigit quotes; the values on this page are for it.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Choose for severe cold forming or straightening before solution treating and ageing to T6/T61. | 105 | 230 | 17 | 60 HB | 40 % IACS |
As fabricated | Mill/forge delivery condition for stock that will be solution treated and aged by the customer. | 180 | 300 | 12 | 85 HB | 40 % IACS |
Solution heat treated and artificially aged | Standard peak-strength condition for extrusions and machined parts where SCC exposure is limited. | 435 | 500 | 11 | 140 HB | 32 % IACS |
T61Default T6 variant, underaged | The historically standard supply condition for 7076 forgings and propeller blades — full strength with slightly improved toughness/consistency over plain T6. | 448 | 510 | 12 | 142 HB | 33 % IACS |
What is 7076?
7076 is an older Zn-Mg-Cu wrought alloy (A97076) used historically for structural extrusions and forgings, and now largely replaced by 7075 and later 7000-series alloys. It offers 448 MPa yield, 510 MPa tensile, 12% elongation and 142 HB in the default aged condition, with F, O, T6 and T61 tempers on file and a machinability score of 70. Availability is the main constraint, alongside no practical arc weldability, low formability (score 25), corrosion resistance rated 35 and a 120 °C service ceiling. Specify 7075 for new designs unless a legacy drawing calls out 7076. 7076 has a density of 2.8 g/cm³ (0.101 lb/in³), heavier than 81% of aluminum grades. It melts at 475°C (887 °F). 7076 has a yield strength of 448 MPa (65 ksi) and a tensile strength of 510 MPa (74 ksi) — stronger than 91% of aluminum grades. Elongation at break is 12% and the elastic modulus is 71 GPa (10.3 Msi).
What is 7076 used for?
- Structural extrusions
- Legacy aerospace components
- Replacement forgings for older airframes
- Machined structural fittings
- Bolted frame and beam sections
- Repair and MRO spares
Advantages
- High strength — 448 MPa (65 ksi), better than 91% of aluminum grades
Limitations
- Difficult to weld — 20/100, worse than 89% of aluminum grades
- Needs corrosion protection — 35/100, worse than 85% of aluminum grades
- Limited service temperature — 120°C (248 °F), worse than 79% of aluminum grades
7076 properties
Typical room-temperature values for 7076-T61; bars are the position among aluminum grades.
Physical3
7076 has a density of 2.8 g/cm³ (0.101 lb/in³), heavier than 81% of aluminum grades. It melts at 475°C (887 °F).
Mechanical12
7076 has a yield strength of 448 MPa (65 ksi) and a tensile strength of 510 MPa (74 ksi) — stronger than 91% of aluminum grades. Elongation at break is 12% and the elastic modulus is 71 GPa (10.3 Msi).
Thermal6
7076 is rated for continuous service to 120°C (248 °F). It conducts heat at 150 W/m·K (86.7 BTU/hr·ft·°F), better than 58% of aluminum grades. Thermal expansion is 23.6 µm/m·K (13.1 µin/in·°F).
Electrical3
7076 conducts electricity at 33 % IACS, worse than 57% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is fair (35/100), worse than 85% of aluminum grades.
Sustainability4
Producing a kilogram of 7076 takes about 200 MJ of energy and emits 12 kg of CO₂ — less than 60% of aluminum grades. Typical recycled content is 20%.
Manufacturability7
7076's machinability is very good (70/100, better than 72% of aluminum grades); weldability poor (20/100); formability poor (25/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the aluminum family
Yield strength against density for every aluminum grade FabDigit runs. 7076 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 7076
Is 7076 easy to machine?
Machines freely in T6/T61 with sharp carbide tooling, high speeds and generous coolant; produces clean chips but leaves high residual stress that can distort thin parts.
Can 7076 be welded?
Not recommended for arc welding (hot cracking and severe HAZ SCC due to Zn+Cu); join by riveting, bolting or friction-stir/adhesive methods.
Can 7076 be formed, bent or molded?
Hot forge/extrude at roughly 380–440 °C; do cold forming in the O or freshly quenched W temper, then age — T61 material has little cold formability.
7076 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 | ≤ 0.4 | |
| Feimpurity limit | ≤ 0.6 | |
| Cu | 0.3 – 1 | 0.6 |
| Mngrain-structure control in place of Cr | 0.3 – 0.8 | 0.55 |
| Mg | 1.2 – 2 | 1.6 |
| Znprincipal strengthening addition | 7 – 8 | 7.5 |
| Tigrain refiner | ≤ 0.2 | |
| Others (each) | ≤ 0.05 | |
| Others (total) | ≤ 0.15 | |
| Al | balance |
What surface finishes work on 7076?
Takes clear and hard anodizing well (slightly grey tone), chromate/trivalent conversion coating and primer-paint systems; shot peening plus a protective coating is advisable where stress-corrosion exposure is possible.
Surface treatments FabDigit runs on aluminum parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Organic Coating
Equivalent designations
Standards and trade names that resolve to Aluminum 7076 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- A97076
- Also called
- 7076-T61
How much does 7076 cost?
7076 is a high-cost aluminum ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
7076 — frequently asked
What is 7076 used for?
7076 is typically used for structural extrusions, legacy aerospace components, replacement forgings for older airframes, machined structural fittings, bolted frame and beam sections and repair and MRO spares. In short: legacy 7075 substitute; high-strength extrusion alloy; limited current availability.
What is the yield strength of 7076?
7076 has a typical yield strength of 448 MPa (65 ksi) and a tensile strength of 510 MPa (74 ksi) — stronger than 91% of aluminum grades. Strength varies by condition: see the 4 listed tempers.
Is 7076 easy to machine?
Yes — machinability is rated very good (70/100, better than 72% of aluminum grades). Machines freely in T6/T61 with sharp carbide tooling, high speeds and generous coolant; produces clean chips but leaves high residual stress that can distort thin parts.
Can 7076 be welded?
Not readily — weldability is rated poor (20/100). Not recommended for arc welding (hot cracking and severe HAZ SCC due to Zn+Cu); join by riveting, bolting or friction-stir/adhesive methods.
What surface finishes work on 7076?
Takes clear and hard anodizing well (slightly grey tone), chromate/trivalent conversion coating and primer-paint systems; shot peening plus a protective coating is advisable where stress-corrosion exposure is possible.
Can 7076 be formed, bent or molded?
Hot forge/extrude at roughly 380–440 °C; do cold forming in the O or freshly quenched W temper, then age — T61 material has little cold formability.
What is the maximum service temperature of 7076?
7076 is rated for continuous use to about 120°C (248 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 7076-T61 and 7076-O?
T61 is the default condition — the historically standard supply condition for 7076 forgings and propeller blades — full strength with slightly improved toughness/consistency over plain T6. O: choose for severe cold forming or straightening before solution treating and ageing to T6/T61. Yield strength is 448 MPa in T61 versus 105 MPa in O.
How much does 7076 cost?
7076 is a high-cost aluminum ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- International Alloy Designations and Chemical Composition Limits for Wrought Aluminum (Teal Sheets) — The Aluminum Association (2018)
- ASM Handbook Vol.2 — Properties and Selection: Nonferrous Alloys and Special-Purpose Materials — ASM International (1990)
- ASM Handbook Vol.5 — Surface Engineering; Vol.6 — Welding, Brazing and Soldering; Vol.13 — Corrosion — ASM International (1994)
- MMPDS-style typical property tables for 7000-series wrought alloys — Battelle/FAA (2021)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.