Description of S235JR Rectangular Pipe S235JR is a non-alloy structural steel grade defined under the European standard EN 10025-2. When fabricated into rectangular hollow sections (RHS), it offers excellent mechanical properties, weldability, and versatility for construction and engineering applications. Material Properties S235JR steel is characterized by its minimum yield strength of 235 MPa, ensuring reliable load-bearing capacity. Its chemical composition includes low carbon content (typically ≤0.17%), manganese (≤1.40%), and trace amounts of phosphorus and sulfur (≤0.045% and ≤0.045%, respectively). This composition enhances ductility and formability while maintaining structural integrity. Manufacturing Process Rectangular pipes made from S235JR are produced through cold-forming or hot-rolling processes. Cold-formed sections are created by shaping flat steel coils into rectangular profiles, while hot-rolled pipes are formed at high temperatures for thicker walls and larger dimensions. Both methods ensure dimensional accuracy and smooth surfaces. Mechanical Performance - Yield Strength: ≥235 MPa - Tensile Strength: 360–510 MPa - Elongation at Break: ≥26% (for thicknesses ≤16mm) These properties make S235JR pipes suitable for static and dynamic loads in structural frameworks. Advantages 1. Weldability: Low carbon equivalent (CEV) minimizes cracking risks, allowing arc welding, MIG, and TIG methods without preheating under normal conditions. 2. Corrosion Resistance: While not inherently corrosion-resistant, surface treatments (galvanizing, painting) can enhance durability. 3. Machinability: Easily cut, drilled, or bent to fit custom designs. Applications - Construction: Beams, columns, and trusses in buildings. - Infrastructure: Bridges, guardrails, and support frameworks. - Industrial Equipment: Conveyor systems, machinery frames. - Furniture & Architecture: Modern designs requiring sleek, sturdy profiles. Standards & Certifications S235JR RHS complies with EN 10219 (cold-formed) or EN 10210 (hot-finished), ensuring traceability and quality. Additional certifications (e.g., CE marking) may apply based on regional regulations. Environmental Considerations S235JR is 100% recyclable, aligning with sustainable construction practices. Conclusion S235JR rectangular pipes combine strength, adaptability, and cost-efficiency, making them a preferred choice for diverse structural projects. Their compliance with international standards ensures reliability across industries. (Word count: 500)