S355JR square and rectangular tubes are a type of hot-rolled, weldable, fine-grained structural steel defined in European standard EN 10025-2. Its minimum yield strength is 355 MPa, and “JR” indicates that the material has an impact absorption energy of not less than 34 J at room temperature. The chemical composition mainly includes carbon, manganese, and silicon, with a carbon content not exceeding 0.21%. Mechanical properties range from tensile strength of 470-630 MPa, and elongation is typically not less than 21%. This material is widely used in building structures, bridges, vehicles, and machinery manufacturing, and possesses good processing and welding properties.
Application Areas
S355JR square and rectangular tubing, with its high strength, excellent processing performance, and wide applicability, demonstrates significant application potential in multiple fields:
1. Building Structures: As beams, columns, and supporting structures in steel structure buildings, its high strength and stability effectively support large-span spaces, improving the overall safety and durability of buildings.
2. Machinery Manufacturing: In heavy machinery, vehicle manufacturing, and agricultural equipment, S355JR square and rectangular tubing is used to manufacture key components such as frames, support frames, and drive shafts, ensuring stable equipment operation.
3. Bridge Construction: Due to its excellent fatigue resistance and weldability, it has become an indispensable component in bridge structures, such as bridge piers and bridge deck support systems.
4. Furniture Manufacturing: With the integration of modern design concepts, S355JR square and rectangular tubing, with its simple lines and good load-bearing capacity, is widely used in the design of office furniture and outdoor leisure furniture.
5. Automobile Manufacturing: With the trend of new energy vehicles and lightweight design, S355JR square tubes have become an important material for vehicle body structural components due to their high strength and low density.
