2.Corrosion resistance is poor, but it can be effectively protected by coating with pure aluminum; it is easy to crack when welding, but it can be welded by special process.
Chemical composition
| Element | Cu | Si | Fe | Mn | Mg | Zn | Cr | Ti | Al |
| Content | 3.8-4.9 | 0.5 | 0.5 | 0.3-0.9 | 1.2-1.8 | 0.25 | 0.1 | 0.15 | Remain |
Mechanical properties
| Tensile Strength MPa |
Yield strength MPa |
Elongation% |
Fatigue strength MPa |
Hardness HB |
| 470 | 325 | 10 | 105 | 120 |
