International standard · ISO
2024
ISO/TR 2778:1977 — ISO/TR 2778
Chemical composition
| Element | min | max | Similar | Remarks |
|---|---|---|---|---|
| Al | Bal | Bal | ||
| Cr | 0.1 | |||
| Cu | 3.8 | 4.9 | ||
| Fe | 0.5 | |||
| Mg | 1.2 | 1.8 | ||
| Mn | 0.3 | 0.9 | ||
| Others each | 0.05 | |||
| Si | 0.5 | |||
| Ti | 0.15 | |||
| Total Others | 0.15 | |||
| Zn | 0.25 |
Mechanical properties
| Heat treatment / condition | Yield strength | Tensile strength | Elongation | Reduction of area | Impact energy | Hardness |
|---|---|---|---|---|---|---|
| Drawn tubes +TB, 6.5 < t <= 12.5 mm | ≥275 | ≥420 | ≥10 Lo = 50mm; A = min 11% in Lo = 5.65√So mm | |||
| Drawn tubes +TB, t <= 6.5 mm | ≥285 | ≥430 | ≥10 Lo = 50mm; A = min 11% in Lo = 5.65√So mm |