Aluminum 7040-F (As fabricated)
Temper
AA 7040 · EN AW-7040, AW 7040
Mill intermediate plate for re-heat-treatment by the user; no guaranteed properties.
Values for the F condition
Other 7040 tempers and conditions
7040 is listed in 7 conditions; see the grade overview at 7040.
Compare all 7 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Pick for maximum formability or before re-solution heat treating; strength is far below service level. | 115 | 250 | 15 | 65 HB | 45 % IACS |
FThis page As fabricated | Mill intermediate plate for re-heat-treatment by the user; no guaranteed properties. | 180 | 300 | 12 | 90 HB | 44 % IACS |
T73, stress relieved by stretching | Pick for the most SCC-critical thick sections where toughness beats peak strength. | 425 | 490 | 11 | 138 HB | 41.5 % IACS |
T7451Default T74, stress relieved by stretching | The standard supply condition for 7040 aerospace thick plate: near-T6 strength with good through-thickness toughness, SCC resistance and low residual stress for deep machining. | 450 | 505 | 10 | 145 HB | 40.5 % IACS |
T76, stress relieved by stretching | Choose when high strength plus exfoliation-corrosion resistance is needed in moderately thick plate; toughness a little below T7451. | 480 | 530 | 9 | 153 HB | 39 % IACS |
T6, stress relieved by stretching | T6 strength with stretch stress relief so heavily machined plate stays dimensionally stable. | 505 | 565 | 8 | 163 HB | 33 % IACS |
Solution heat treated and artificially aged | Choose when maximum static strength matters and exfoliation/SCC exposure is low; toughness and stress-corrosion resistance are the lowest of the aged tempers. | 510 | 570 | 8 | 165 HB | 33 % IACS |
What is 7040-F?
7040-F is 7040 in the F temper — mill intermediate plate for re-heat-treatment by the user; no guaranteed properties. 7040-F has a yield strength of 180 MPa (26.1 ksi) and a tensile strength of 300 MPa (43.5 ksi) — weaker than 54% of aluminum grades. Elongation at break is 12% and the elastic modulus is 71 GPa (10.3 Msi). 7040-F has a density of 2.82 g/cm³ (0.102 lb/in³), heavier than 89% of aluminum grades. It melts at 480°C (896 °F). T7451 is the default condition FabDigit quotes; F is available on request or by drawing note.
Advantages
- Tough — resists crack growth — 45 MPa·√m (41 ksi·√in), better than 100% of aluminum grades
- High electrical conductivity — 44 % IACS, better than 85% of aluminum grades
- Conducts heat well — 168 W/m·K (97.1 BTU/hr·ft·°F), better than 81% of aluminum grades
Limitations
- Needs corrosion protection — 38/100, worse than 79% of aluminum grades
- Difficult to weld — 25/100, worse than 76% of aluminum grades
7040-F properties
Typical room-temperature values for 7040-F; 22 are specific to this condition. Other listed values are 7040 reference data and may not represent this condition. Bars are the position among aluminum grades.
Physical3
7040-F has a density of 2.82 g/cm³ (0.102 lb/in³), heavier than 89% of aluminum grades. It melts at 480°C (896 °F).
Mechanical12
7040-F has a yield strength of 180 MPa (26.1 ksi) and a tensile strength of 300 MPa (43.5 ksi) — weaker than 54% of aluminum grades. Elongation at break is 12% and the elastic modulus is 71 GPa (10.3 Msi).
Thermal6
7040-F is rated for continuous service to 150°C (302 °F). It conducts heat at 168 W/m·K (97.1 BTU/hr·ft·°F), better than 81% of aluminum grades. Thermal expansion is 23.4 µm/m·K (13 µin/in·°F).
Electrical3
7040-F conducts electricity at 44 % IACS, better than 85% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is fair (38/100), worse than 79% of aluminum grades.
Sustainability4
Producing a kilogram of 7040-F takes about 205 MJ of energy and emits 12.5 kg of CO₂ — more than 76% of aluminum grades. Typical recycled content is 10%.
Manufacturability7
7040-F's machinability is fair (50/100, worse than 65% of aluminum grades); weldability poor (25/100); formability fair (45/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 7040-F
Is 7040 easy to machine?
Excellent chip formation in T74/T76 tempers — high-speed carbide, polished flutes, 3–8 % emulsion coolant; stretch-relieved plate keeps distortion low on deep pocket milling.
Can 7040 be welded?
Not suitable for fusion welding (hot cracking, SCC in HAZ); join by riveting, bolting or friction-stir welding with qualified procedures.
Can 7040 be formed, bent or molded?
Form in O or freshly quenched W condition only; aged plate has limited bend ductility and needs generous radii and stress-relief planning.
What surface finishes work on 7040?
Chromic/tartaric-sulfuric anodize plus primer or hard anodize for wear; alkaline etch and conversion coatings work well, avoid strong caustics and dissimilar-metal contact without insulation.
7040 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 | ≤ 0.1 | 0.05 |
| Fe | ≤ 0.13 | 0.07 |
| Cu | 1.5 – 2.3 | 1.9 |
| Mn | ≤ 0.04 | 0.01 |
| Mg | 1.7 – 2.4 | 2 |
| Cr | ≤ 0.04 | 0.01 |
| Zn | 5.7 – 6.7 | 6.2 |
| Zrgrain-structure control (Al3Zr dispersoids) | 0.05 – 0.12 | 0.09 |
| Ti | ≤ 0.06 | 0.02 |
| Others (each)each | ≤ 0.05 | — |
| Others (total)total | ≤ 0.15 | — |
| Al | balance | — |
7040-F — frequently asked
What is 7040-F used for?
7040-F is typically used for wing spars, bulkheads and heavy frames. In short: thick aerospace plate.
What is the yield strength of 7040-F?
7040-F has a typical yield strength of 180 MPa (26.1 ksi) and a tensile strength of 300 MPa (43.5 ksi) — weaker than 54% of aluminum grades. Strength varies by condition: see the 7 listed tempers.
Is 7040-F easy to machine?
Reasonably — machinability is rated fair (50/100, worse than 65% of aluminum grades). Excellent chip formation in T74/T76 tempers — high-speed carbide, polished flutes, 3–8 % emulsion coolant; stretch-relieved plate keeps distortion low on deep pocket milling.
Can 7040-F be welded?
Not readily — weldability is rated poor (25/100). Not suitable for fusion welding (hot cracking, SCC in HAZ); join by riveting, bolting or friction-stir welding with qualified procedures.
What surface finishes work on 7040-F?
Chromic/tartaric-sulfuric anodize plus primer or hard anodize for wear; alkaline etch and conversion coatings work well, avoid strong caustics and dissimilar-metal contact without insulation.
Can 7040-F be formed, bent or molded?
Form in O or freshly quenched W condition only; aged plate has limited bend ductility and needs generous radii and stress-relief planning.
What is the maximum service temperature of 7040-F?
7040-F is rated for continuous use to about 150°C (302 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 7040-T7451 and 7040-O?
T7451 is the default condition — the standard supply condition for 7040 aerospace thick plate: near-T6 strength with good through-thickness toughness, SCC resistance and low residual stress for deep machining. O: pick for maximum formability or before re-solution heat treating; strength is far below service level. Yield strength is 450 MPa in T7451 versus 115 MPa in O.
Can FabDigit make parts in 7040-F?
Yes — 7040-F is available for CNC machining and sheet metal; every part is priced by an engineer rather than instantly. Upload a STEP file to get a price and a DFM check.
Sources
- International Alloy Designations and Chemical Composition Limits for Wrought Aluminum (Teal Sheets) — The Aluminum Association (2018)
- Aerospace thick plate alloys 7040/7050 (T7451, T7651) plate data — Constellium (formerly Pechiney/Alcan) (2020)
- ASM Handbook Vol. 2: Properties and Selection — Nonferrous Alloys — ASM International (1990)
- MMPDS-17 Metallic Materials Properties Development and Standardization — Battelle/FAA (2022)
- EN 485-2 Aluminium and aluminium alloys — Sheet, strip and plate: mechanical properties — CEN (2016)
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.