Rectangular/ Square hollow section are formed from coils and then ran through a series of dies. They are are welded from the inside to form their shape.
Manufacturing flow chart
They are measured by their outside dimensions and their wall thickness.
Rectangular/ Square hollow section is commonly available in Q195, Q215, Q235, Q345 grade.
It can be purchased online and at any Metal Supermarkets location. It can be cut to your exact specifications.
Chemical composition
Steel Grade: Q195, Q215, Q235, Q345, S235JR, S275JR, SS4007-| Data | Elements（%） | ||||
| Materal Grade | C | Mn | S | P | Si |
| Q195 | 0.06-0.12 | 0.25-0.50 | <0.05 | <0.045 | <0.30 |
| Q215 | 0.09-0.15 | 0.25-0.55 | <0.05 | <0.045 | <0.30 |
| Q235 | 0.12-0.20 | 0.30-0.70 | <0.045 | <0.045 | <0.30 |
| Q345 | <0.20 | 1.0-1.6 | <0.04 | <0.04 | <0.55 |
Mechanical property
| Materal Grade | Yield point (Mpa) | Tensile Strength (Mpa) | Elongation(%) |
| Q195 | >195 | 315-430 | 32-33 |
| Q215 | >215 | 335-450 | 26-31 |
| Q235 | >235 | 375-500 | 24-26 |
| Q345 | >345 | 470-630 | 21-22 |