7075-T6 vs 6082-T6
7075-T6 and 6082-T6 sit at different ends of the aluminum strength spectrum. 7075 is a zinc-based aerospace alloy with exceptional strength (~572 MPa tensile / 503 MPa yield) but poor weldability and weaker corrosion resistance. 6082 is a magnesium-silicon structural alloy — far weaker (~310 MPa tensile / 260 MPa yield) but weldable, more corrosion-resistant, and cheaper. Peak strength versus weldable structural value.
The verdict
Choose 7075-T6 for high-stress, non-welded machined parts — aerospace fittings, tooling, and load-critical components where its ~503 MPa yield is decisive. Choose 6082-T6 for welded structural frames, extrusions, and corrosion-exposed parts where weldability, better corrosion resistance, and lower cost matter more than peak strength.
Side-by-side data
| Property | 7075-T6 | 6082-T6 |
|---|---|---|
| Category | Aluminum | Aluminum |
| Density (g/cm³) | 2.81 | 2.7 |
| Tensile strength (MPa) | 572 | 310 |
| Yield strength (MPa) | 503 | 260 |
| Elongation (%) | 11 | 10 |
| Hardness | 150 HB | 95 HB |
| Max service temp (°C) | 130 | 150 |
| Machinability | ●●●●● | ●●●●● |
| Corrosion resistance | ●●●●● | ●●●●● |
| Relative cost | ●●●●● | ●●●●● |
| Thermal cond. (W/m·K) | 130 | 170 |
| Typically used for | High-strength aerospace & high-stress parts | Structural extrusions & frames |
Which should you choose?
Choose 7075-T6 when…
- Maximum strength is required (~503 MPa yield, ~63% higher than 6082)
- Machining high-stress aerospace fittings, brackets, and tooling
- Parts are CNC-machined, not welded (7075 is not weldable)
- Weight-critical designs benefit from high strength-to-weight
- Highly stressed jigs, molds, and competition components
- Service is dry/protected, since corrosion resistance is modest (2.5/5)
Choose 6082-T6 when…
- Building welded structural frames and weldments (6082 welds well)
- Extruded structural profiles and frames are the product form
- Better corrosion resistance is needed (3.5/5 vs 7075's 2.5/5)
- Lower cost matters (~2.1 vs 7075's ~3.5 index)
- Moderate strength (~260 MPa yield) is adequate for the load
- Easier machining and forming with good general workability (4.0 index)
Key differences that matter
- Strength: 7075-T6 ~572 MPa tensile / 503 MPa yield vs 6082-T6 ~310 MPa / 260 MPa — 7075 has ~93% higher yield
- 7075 is essentially non-weldable (zinc-based 7xxx); 6082 is a weldable 6xxx structural alloy
- Corrosion: 6082 (3.5/5) outperforms 7075 (2.5/5); 7075 is prone to stress-corrosion cracking unless tempered (e.g. T73)
- 7075 max service temp is lower (~130°C) than 6082 (~150°C) and it's costlier (~3.5 vs ~2.1)
- 6082 is extrusion-friendly (lists Extrusion, CNC, Sheet Metal); 7075 lists CNC only — a machined, not extruded/welded, alloy
- Density is similar (7075 2.81 vs 6082 2.70 g/cc); 7075's strength advantage drives its strength-to-weight lead
- Machinability is comparable, with 6082 slightly easier in general forming and a smaller chip-control challenge
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Open the Material SelectorGet a Quote →Frequently asked questions
Is 7075 stronger than 6082 aluminum?
Yes, significantly. 7075-T6 reaches about 572 MPa tensile and 503 MPa yield, nearly double 6082-T6's roughly 310 MPa tensile and 260 MPa yield. 7075 is a high-strength aerospace alloy, but it can't be welded and resists corrosion less well, so 6082 remains the choice for welded structural work.
Can 7075 aluminum be welded?
7075 is generally considered non-weldable by conventional fusion methods — the zinc-based 7xxx chemistry is highly prone to hot cracking and severe loss of corrosion resistance in the weld zone. It's used as machined parts with mechanical fasteners. If you need a weldable structural aluminum, choose 6082 or 6061 instead.
Which aluminum resists corrosion better, 7075 or 6082?
6082 resists corrosion better, rated about 3.5/5 versus 2.5/5 for 7075. The zinc in 7075 makes it susceptible to stress-corrosion cracking unless a special temper like T73 is used. For corrosion-exposed structural parts, 6082's magnesium-silicon chemistry is more forgiving and reliable.
When should I choose 6082 over 7075?
Choose 6082 when you need to weld, extrude, or expose parts to corrosion, and when moderate strength (~260 MPa yield) is enough. It's cheaper, more corrosion-resistant, and far easier to fabricate. Reserve 7075 for highly stressed, machined, fastened parts where its ~503 MPa yield strength is genuinely required.
Property values are typical/nominal figures for early-stage guidance only and vary by temper, grade, supplier and heat treatment. Confirm critical specifications against a certified datasheet or with an mfgiq engineer before production.