6061 vs 5052 Aluminum
6061 is a heat-treatable Mg-Si alloy bought in T6 for machining and structure. 5052 is a non-heat-treatable Mg alloy bought as sheet in H32, strengthened by cold work. 6061-T6 is stronger and stiffer to machine; 5052-H32 bends tighter without cracking, resists salt water better, and keeps more of its strength in a weld because there is no temper to lose.
The rule of thumb in a sheet metal shop is 5052 for formed enclosures, brackets and tanks, and 6061 for plate, bar, extrusions and anything machined. Where a 6061 part must be bent tightly, anneal or use T4 and expect to lose the T6 numbers.
| Property | 6061-T6 | 5052-H32 |
|---|---|---|
| Alloy family | 6xxx (Mg-Si), heat treatable | 5xxx (Mg), strain-hardened |
| Tensile | 310 MPa (45 ksi), T6 | 228 MPa (33 ksi), H32 |
| Yield | 276 MPa (40 ksi), T6 | 193 MPa (28 ksi), H32 |
| Elongation | 12-17%, T6 | 12-18%, H32 |
| Density | 2.70 g/cm³ | 2.68 g/cm³ |
| Hardness | ~95 HB | ~60 HB |
| Min bend radius (1.5 mm sheet) | ~1.5-2.5t in T6 | ~0.5-1t in H32 |
| Weld strength retention | Drops to ~165 MPa tensile at the weld | Retains most of H32 strength |
| Saltwater corrosion | Good | Excellent |
| Typical uses | Machined parts, structure, extrusions | Sheet metal enclosures, tanks, marine panels |
Typical values for the stated conditions. Confirm against the mill certificate and your spec.
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Decision matrix
A check marks the side with the edge on that dimension.
| Dimension | 6061-T6 | 5052-H32 |
|---|---|---|
| Machining | ✓ Good; T6 chips cleanly | Fair; soft and gummy, builds up on the tool |
| Welding | Good; heat-affected zone loses T6 strength | ✓ Excellent; 5356 filler, small strength loss |
| Forming | Fair in T6; good in O or T4 | ✓ Excellent; tight bends and draws in H32 |
| Strength | ✓ 276 MPa yield in T6 | 193 MPa yield in H32 |
| Corrosion resistance | Good; anodize for marine | ✓ Excellent; the marine sheet alloy |
| Finishing | ✓ Anodizes uniformly, dyes well | Anodizes well; some batch-to-batch color variation |
| Material cost | Baseline for plate, bar, extrusion | Similar per pound in sheet; often cheaper in thin gauge |
| Availability | Plate, bar, tube, extrusions everywhere | Sheet and plate everywhere; no extrusions |
Choose 6061-T6 when
- Machined parts, plate and bar work, extrusions
- Strength or hardness sizes the part
- Threaded holes and press fits that would strip or deform in a soft alloy
- You want a uniform anodized cosmetic finish
Choose 5052-H32 when
- Formed sheet metal: enclosures, chassis, brackets with tight bends
- Welded tanks, boat parts and anything in salt spray
- The weld must carry load without a post-weld heat treat
- Thin gauge where 6061-T6 would crack on the brake
Frequently asked questions
- Which is stronger, 6061 or 5052?
- 6061-T6, at about 276 MPa yield against 193 MPa for 5052-H32. After welding the gap closes: 6061 loses its temper in the heat-affected zone while 5052 keeps most of its strain-hardened strength.
- Which bends better?
- 5052-H32. It takes inside bend radii near one material thickness without cracking. 6061-T6 needs two to three times the thickness and can still crack on the outside of the bend, so formed 6061 parts are often bent in T4 or O and aged afterward.
- Is 5052 good for marine use?
- Yes. The 5xxx magnesium alloys are the standard marine sheet alloys, and 5052 resists saltwater and salt spray better than 6061. For heavier structure in the same family, 5083 and 5086 are the usual steps up.
- Can I machine 5052?
- You can, but it is soft and gummy compared with 6061-T6. Expect built-up edge, burrs and a poorer surface finish. For machined parts specify 6061; for sheet metal that gets a few drilled holes, 5052 is fine.
