It is a long steel bar with a cross-section in the shape of a right-angle L, consisting of two mutually perpendicular sides (legs). It belongs to the shaped steel products in carbon structural steel. Its core characteristics include: Material: Commonly used Q235B, Q355B (Chinese standard), SS400 (Japanese), ASTM A36 (American), etc., with tensile strength ≥375MPa (Q235B). Surface Treatment: Galvanized (hot-dip galvanized layer thickness ≥85μm), painted, black material (bare steel), with decreasing rust resistance in that order. Process: Hot-rolled forming (commonly used), cold-bent forming (higher precision, suitable for thin-walled parts).