Q235 Square Pipe is a Chinese national standard carbon structural steel square pipe with a specified yield strength of 235MPa, available in hot-rolled and welded types for diverse application needs. It features well-balanced mechanical strength and plasticity, excellent weldability, machinability and cold workability for easy on-site fabrication and customization. Its square cross-section offers superior bending and torsion resistance, paired with precise dimensional tolerance and uniform wall thickness for stable structural performance. With high cost-effectiveness and wide availability, it’s a mainstream general-purpose square pipe for industrial and civil structural applications under normal temperature and pressure.