ASTM A283 Square Steel Bar is a cost-effective carbon structural steel square bar, available in Grades A, B, C and D with hot-rolled and cold-finished variants for general structural fabrication. It features well-balanced tensile strength and ductility, excellent weldability, machinability and cold workability for easy on-site processing and customization. Its square cross-section delivers superior bending and torsion resistance, paired with precise dimensional tolerance and uniform material quality. Stable under normal temperature and pressure, it’s highly accessible and economical, a mainstream general-purpose square bar for industrial and civil structural projects.