Aluminum 7449 T76511
Temper
AA 7449 · UNS A97449 · EN AW-7449
T76511 = extrusion, solution treated, stretched, T76 overaged
Stringer/spar extrusions needing high strength with exfoliation resistance.
Values for the T76511 condition
Other 7449 tempers and conditions
7449 is listed in 8 conditions; see the grade overview at 7449.
Compare all 8 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Mill/intermediate condition for heavy forming or re-heat-treat; not a service temper. | 110 | 235 | 16 | 65 HB | 45 % IACS |
Forging, solution treated, cold-compression stress relieved, overaged | Die/hand forgings where through-thickness SCC resistance and low residual stress matter. | 545 | 590 | 8 | 172 HB | 39 % IACS |
T7951Default Solution treated, stretched, retrogression/near-peak overaged plate | The standard supply condition for 7449 thick plate: near-peak strength with improved SCC/exfoliation over T6. | 570 | 620 | 10 | 180 HB | 38 % IACS |
T76, stress relieved by stretching | Best compromise of high strength with good exfoliation resistance for wing skin plate. | 605 | 640 | 9 | 188 HB | 35 % IACS |
T6, stress relieved by stretching | Peak-aged plate with low residual stress for machined parts where SCC exposure is limited. | 615 | 655 | 8 | 193 HB | 31 % IACS |
Extrusion, solution treated, stretched, T79 overaged | High-strength stringer extrusions for upper wing panels. | 615 | 645 | 9 | 188 HB | 37 % IACS |
Solution heat treated and artificially aged | Maximum strength for thin, non-stress-corrosion-critical parts; poorest SCC/exfoliation resistance. | 620 | 660 | 8 | 195 HB | 31 % IACS |
T76511This page Extrusion, solution treated, stretched, T76 overaged | Stringer/spar extrusions needing high strength with exfoliation resistance. | 620 | 650 | 9 | 190 HB | 35 % IACS |
What is 7449 T76511?
7449 T76511 is 7449 in the T76511 temper — stringer/spar extrusions needing high strength with exfoliation resistance. 7449 T76511 has a yield strength of 620 MPa (89.9 ksi) and a tensile strength of 650 MPa (94.3 ksi) — stronger than 99% of aluminum grades. Elongation at break is 9% and the elastic modulus is 70 GPa (10.2 Msi). 7449 T76511 has a density of 2.82 g/cm³ (0.102 lb/in³), heavier than 89% of aluminum grades. It melts at 475°C (887 °F). T7951 is the default condition FabDigit quotes; T76511 is available on request or by drawing note.
Advantages
- High strength — 620 MPa (89.9 ksi), better than 99% of aluminum grades
- Easy to machine — 79/100, better than 91% of aluminum grades
Limitations
- Difficult to weld — 18/100, worse than 94% of aluminum grades
- Limited service temperature — 120°C (248 °F), worse than 79% of aluminum grades
7449 T76511 properties
Typical room-temperature values for 7449 T76511; 20 are specific to this condition. Other listed values are 7449 reference data and may not represent this condition. Bars are the position among aluminum grades.
Physical3
7449 T76511 has a density of 2.82 g/cm³ (0.102 lb/in³), heavier than 89% of aluminum grades. It melts at 475°C (887 °F).
Mechanical13
7449 T76511 has a yield strength of 620 MPa (89.9 ksi) and a tensile strength of 650 MPa (94.3 ksi) — stronger than 99% of aluminum grades. Elongation at break is 9% and the elastic modulus is 70 GPa (10.2 Msi).
Thermal6
7449 T76511 is rated for continuous service to 120°C (248 °F). It conducts heat at 145 W/m·K (83.8 BTU/hr·ft·°F), better than 53% of aluminum grades. Thermal expansion is 23.4 µm/m·K (13 µin/in·°F).
Electrical3
7449 T76511 conducts electricity at 35 % IACS, better than 52% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is fair (42/100), worse than 69% of aluminum grades.
Sustainability4
Producing a kilogram of 7449 T76511 takes about 205 MJ of energy and emits 12.5 kg of CO₂ — more than 76% of aluminum grades. Typical recycled content is 12%.
Manufacturability7
7449 T76511's machinability is very good (79/100, better than 91% of aluminum grades); weldability poor (18/100); formability poor (20/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 7449 T76511
Is 7449 easy to machine?
Machines well in T7x with sharp polished-flute carbide tools, high speed and flood or MQL coolant; plan symmetric stock removal and stress-relieved (T-x51/x52) material to control distortion in thin-web parts.
Can 7449 be welded?
Not suitable for fusion welding (hot cracking, severe HAZ softening and SCC); join by fasteners, bonding, or friction stir welding with qualified parameters.
Can 7449 be formed, bent or molded?
Form in W or freshly quenched condition or hot; aged T6/T7x plate has low ductility and large minimum bend radii — cold forming is limited to gentle contours and stretch-forming of skins.
What surface finishes work on 7449?
Chromic/sulphuric or tartaric-sulphuric anodize plus chromate-free primer is standard aerospace practice; hard anodize is possible but coating is dark and slightly brittle, and shot peening is often used on machined SCC-critical surfaces.
7449 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 | ≤ 0.12 | 0.06 |
| Feimpurity limit | ≤ 0.15 | 0.08 |
| Cu | 1.4 – 2.1 | 1.8 |
| Mn | ≤ 0.2 | 0.05 |
| Mg | 1.8 – 2.7 | 2.2 |
| Cr | ≤ 0.05 | 0.02 |
| Znprincipal strengthening addition | 7.5 – 8.7 | 8.1 |
| Tigrain refiner | ≤ 0.25 | 0.03 |
| Zrdispersoid former (reported with Ti as Ti+Zr limit in some registrations) | ≤ 0.25 | 0.12 |
| Others (each) | ≤ 0.05 | — |
| Others (total) | ≤ 0.15 | — |
| Al | balance | — |
7449 T76511 — frequently asked
What is 7449 T76511 used for?
7449 T76511 is typically used for aircraft wing plate, forged wing structure, high-strength structural components, machined wing ribs and spars, airframe forgings and fittings and thick plate for machined aerospace structure. In short: european 7055-class plate; good machinability for 7000 series; available in SCC-resistant T7x.
What is the yield strength of 7449 T76511?
7449 T76511 has a typical yield strength of 620 MPa (89.9 ksi) and a tensile strength of 650 MPa (94.3 ksi) — stronger than 99% of aluminum grades. Strength varies by condition: see the 8 listed tempers.
Is 7449 T76511 easy to machine?
Yes — machinability is rated very good (79/100, better than 91% of aluminum grades). Machines well in T7x with sharp polished-flute carbide tools, high speed and flood or MQL coolant; plan symmetric stock removal and stress-relieved (T-x51/x52) material to control distortion in thin-web parts.
Can 7449 T76511 be welded?
Not readily — weldability is rated poor (18/100). Not suitable for fusion welding (hot cracking, severe HAZ softening and SCC); join by fasteners, bonding, or friction stir welding with qualified parameters.
What surface finishes work on 7449 T76511?
Chromic/sulphuric or tartaric-sulphuric anodize plus chromate-free primer is standard aerospace practice; hard anodize is possible but coating is dark and slightly brittle, and shot peening is often used on machined SCC-critical surfaces.
Can 7449 T76511 be formed, bent or molded?
Form in W or freshly quenched condition or hot; aged T6/T7x plate has low ductility and large minimum bend radii — cold forming is limited to gentle contours and stretch-forming of skins.
What is the maximum service temperature of 7449 T76511?
7449 T76511 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 7449-T7951 and 7449-O?
T7951 is the default condition — the standard supply condition for 7449 thick plate: near-peak strength with improved SCC/exfoliation over T6. O: mill/intermediate condition for heavy forming or re-heat-treat; not a service temper. Yield strength is 570 MPa in T7951 versus 110 MPa in O.
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)
- EN 755-2 Aluminium and aluminium alloys — Extruded rod/bar, tube and profiles: mechanical properties — CEN (2016)
- High-strength 7000-series aerospace plate and extrusion product data (7449/7040/7050) — Constellium (formerly Alcan/Pechiney) (2021)
- ASM Handbook Vol. 2: Properties and Selection — Nonferrous Alloys — ASM International (1990)
- MMPDS-17 typical property practice for 7000-series wrought products — Battelle/FAA (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.