Carbon Steel Square Pipe for Durable Industrial Applications

Carbon steel square pipe is a versatile structural material formed by welding or cold rolling steel strips into rectangular or square cross sections, valued for its rigidity and ease of fabrication. Common grades include Q235B (China), ASTM A500 Grade C (USA), and EN 10210 S355J2 (Europe), offering yield strengths 235–355 MPa to suit different load requirements. The manufacturing process involves roll forming steel sheets into the desired shape, with ERW for thin walls (≤10mm) and SAW for thicker sections, followed by cutting to length (6–12 meters standard). Dimensional specifications range from 20x20x2mm (light duty) to 600x600x20mm (heavy duty), with inner corners typically radiused to prevent stress concentrations. Surface treatments vary from bare steel (painted on site) to galvanized (ISO 1461) or powder coated for outdoor use. Mechanical properties such as elongation (≥20% for ductility) and bendability (180° without cracking) make it suitable for on site modifications. Applications include: building columns and beams, agricultural equipment frames, signage supports, and industrial ductwork. Design considerations involve calculating sectional properties (area, moment of inertia) to ensure compliance with structural codes, while corrosion protection in humid environments often requires zinc rich primers or periodic maintenance.