6061-T6 Aluminum Alloy: Properties, Heat Treatment & Equivalents
ASTM B209/B211 · Updated: 2026-05-25
6061-T6 is the most versatile heat-treatable aluminum alloy, widely used in structural, aerospace, automotive, and marine applications. Its composition (0.8-1.2% Mg, 0.4-0.8% Si, 0.15-0.4% Cu) balances strength, corrosion resistance, and weldability. The T6 temper—solution heat-treated at 530°C, quenched, and artificially aged—achieves the highest strength level. 6061-T6 offers approximately one-third the density of steel with comparable yield strength to mild carbon steel, making it ideal for weight-sensitive applications.
Quick Facts
| Category | Aluminum Alloy |
| Standard | ASTM B209/B211 |
| Density | 2.70 g/cm³ |
| Yield Strength | 276 MPa (40 ksi) |
| Tensile Strength | 310 MPa (45 ksi) |
Global Equivalents & Cross-Reference
| Alternative Standard / Grade | Action |
|---|---|
| EN AW-6061 | Compare |
| AlSi1MgCu | Compare |
| A6061 | Compare |
| AA6061-T6 | Compare |
| ISO AlSi1MgCu | Compare |
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Frequently Asked Questions
Can 6061-T6 be bent without cracking?
6061-T6 has limited formability. For tight-radius bending, use 6061-T4 (naturally aged), perform bending, then age to T6. Alternatively, bend with a minimum radius of 2-3 times material thickness in T6. Hot forming at 175-260°C improves formability but may reduce final strength.