Surface treatment of forge-welded gratings
Steels S235JR, S355JR
- mill finish, without surface treatment
- hot-dip galvanized according to EN ISO 1461
- powder coated – RAL shades
Excerpt from EN ISO 1461
Minimum thickness of zinc coating on steel
| Steel material thickness t [mm] | Local coating thickness (minimum) [μm] | Average coating thickness (minimum) [μm] |
| t < 1.5 | 35 | 45 |
| 1.5 ≤ t ≤ 3 | 45 | 55 |
| 3 < t ≤ 6 | 55 | 70 |
| t > 6 | 70 | 85 |
Excerpt from EN ISO 9223
Atmospheric corrosivity categories
| Category | Corrosivity | Corrosion loss steel [μm/year] | Corrosion loss zinc [μm/year] |
| C1 | Very low | less than 1.3 | less than 0.1 |
| C2 | Low | 1.3 to 25 | 0.1 to 0.7 |
| C3 | Medium | 25 to 50 | 0.7 to 2.1 |
| C4 | High | 50 to 80 | 2.1 to 4.2 |
| C5 | Very high | 80 to 200 | 4.2 to 8.4 |
| CX | Extreme | 200 to 700 | 8.4 to 25 |