NPI structural steels are produced in different quality classes. These include:
Used in construction frameworks, bridges, shipbuilding, and manufacturing of heavy machinery.
| Nominal Size (mm) | Thickness (mm) |
|---|---|
| NPI 80 | 4,00 |
| NPI 160 | 5,00 |
| NPI 300 | 6,50 |
| NPI 450 | 9,00 |
| NPI 600 | 12,00 |