AL · aluminium
Aluminium 7050-T7451
Same family as 7075 and similar to cut, with one important difference: T7451 is stress relieved, so a big pocketed part stays flat after machining.
Quoting this material
- Typical lead time
- 12–18 working days
- Condition
- T7451 - solution heat treated, stress relieved by stretching, then artificially aged
- Achievable finish
- Ra 1.6 µm typical · Ra 0.4 µm best
Machined in-house to your drawing: see the precision CNC machining service and the machine and inspection capability it runs on.
Machinability
Our own 1–10 shop ranking, not a published index: 10 is free-cutting brass C360, 1 is Inconel 718. It ranks how a material behaves on the floor - cycle time, chip control and tool life together. Where a published index exists it is quoted in the note.
Same family as 7075 and similar to cut, with one important difference: T7451 is stress relieved, so a big pocketed part stays flat after machining.
Properties as supplied
| Parameter | Value | Unit |
|---|---|---|
| Tensile strength | 510 | MPa |
| Yield strength (0.2%) | 455 | MPa |
| Elongation | 10 | % |
| Hardness | 150 | HB |
| Thermal conductivity | 157 | W/m·K |
| Modulus of elasticity | 71.7 | GPa |
Hardness, tensile and thermal figures are typical published values for the condition stated. Actual mill certificates govern; send the specification with the drawing and we confirm against the certificate before the material is cut.
Condition
T7451 - solution heat treated, stress relieved by stretching, then artificially aged
Heat treatment
Delivered in T7451; not re-treatable in the shop. The stress relief is the reason to specify it and it comes from the mill.
Achievable surface finish
Ra 1.6 µm
Ra 0.4 µm
Anodises well; aerospace parts are usually primed or coated rather than left bare.
Tooling and cutting parameters
Cutting speed
- 400–700 m/min (carbide)
Feed
- 0.10–0.30 mm/rev turning · 0.08–0.20 mm/tooth milling
Tooling
- TiAlN-coated carbide with a strong edge
Coolant
- Flood, and plenty of it on deep pockets
Starting points for carbide on a rigid setup, not a guarantee. The right numbers depend on the machine, the toolholder and the fixturing - ask and we will say what we would actually run.
Typical applications
- Aerospace bulkheads and wing ribs
- Large machined structural frames
- Motorsport chassis nodes
- High-value tooling bodies
- Defence structural components
DFM notes for this grade
- Buy it for stability: on a part with a deep pocket in a thick plate, the difference between T6 and T7451 is whether the part is flat when it comes off the machine
- Higher strength means higher cutting force and more chatter risk on thin ribs - support the work and finish walls with a light radial engagement
- Not weldable; joints must be mechanical
Questions buyers ask
- When is T7451 worth the extra cost over 7075-T6?
- On any part where flatness matters after machining and the section is thin. T6 in a big pocketed plate can move 0.3–0.5 mm after the part is freed; T7451 is stress relieved before it reaches us, so most of that movement never happens.
- Can you machine a large 7050 part in one setup?
- Usually in two, and the sequence matters more than the setup count. Rough, let it move, semi-finish, then finish the datum and the critical features last. On a large aerospace frame that sequencing is most of the engineering.