Structural Tube, Seamless Steel Tubes For Structural Purposes is made by heating a high-grade carbon steel billet to a suitably high temperature and then entering a hot rolling mill. Under the pressure of the mill, the billet undergoes plastic deformation to form seamless steel pipe. This process refines the internal structure and improves strength and toughness for a wide range of applications, making structural tubes ideal for building solid, reliable projects.
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| Grade | C | Mn | p | S | V | Nb | Ni | |
| Max. | Max.b | Min. | Max. | Max. | Max. | Max. | Max. | |
| L210 a | 0.22 | 0.9 | 0.03 | 0.03 | 0.03 | – | – | – |
| L245 b | 0.28 | 1.2 | 0.03 | 0.03 | 0.03 | c,d | c,d | c,d |
| L290 x42 | 0.28 | 1.3 | – | 0.03 | 0.03 | d | d | d |
| l320 x46 | 0.28 | 1.4 | – | 0.03 | 0.03 | d | d | d |
| L365 x52 | 0.28 | 1.4 | – | 0.03 | 0.03 | d | d | d |
| L390 x56 | 0.28 | 1.4 | – | 0.03 | 0.03 | d | d | d |
| L415 x60 | 0.28e | 1.40e | – | 0.03 | 0.03 | f | f | f |
| L450 x65 | 0.28e | 1.40e | – | 0.03 | 0.03 | f | f | f |
| L485 x70 | 0.28e | 1.40e | – | 0.03 | 0.03 | f | f | f |
| Steel grade | Yield strength | Tensile strength | Elongation |
| Mpa(psi) | Mpa(psi) | （50mm or 2inn） | |
| L210 or A | 210（30500） | 335（48600） | c |
| L245 or B | 245（35500） | 415（60200） | c |
| L290 or X42 | 290（42100） | 415（60200） | c |
| L320 or X46 | 320（46400） | 435（63100） | c |
| L365 or X52 | 360（52200） | 460（66700） | c |
| L390 or X56 | 390（56600） | 490（71100） | c |
| L415 or X60 | 415（60200） | 520（75400） | c |
| L450 or X65 | 450（65300） | 535（77600） | c |
| L485 or X70 | 485（70300） | 570（82700） | c |
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