Similar tensile strength does not necessarily mean similar behaviour after fabrication, says Industrial Tube Manufacturing sales manager Jared Knapp.
He says a comparative study by Industrial Tube provides a practical comparison of how normalised 4130 chromium-molybdenum tube and its dual-phase steel tube, UltraTube RS, behaved under welding and deformation conditions.
“The tested materials had closely comparable yield and tensile strengths, but differences emerged during axial compression,” Knapp says.
“UltraTube RS developed broader, progressive folds, while the tested 4130 specimens formed sharper localised folds with visible tearing.”
The investigation also examined tensile behaviour, weld-zone hardness and joint geometry. Both materials accommodated the applied bending and flattening conditions, while hardness testing identified different responses around the heat affected zone.
“For engineers and fabricators, the findings highlight the value of considering deformation behaviour and local weld-zone properties alongside conventional strength figures,” Knapp says.
Sponsored content: For more information phone 0800 77 11 77, email sales@industrialtube.co.nz or visit www.industrialtube.co.nz.