S275JR square and rectangular tubes are a type of low-alloy high-strength structural steel widely used in construction, bridges, vehicles, and other structural engineering. According to the international standard EN 10025, the main components of S275JR include carbon, manganese, silicon, phosphorus, and sulfur.
Specifically, the carbon content of S275JR structural tubes is typically between 0.10% and 0.21%, a relatively low carbon content that contributes to its good plasticity and toughness. Manganese is a key alloying element in S275JR, generally ranging from 0.30% to 0.60%, contributing to increased strength and hardness. Furthermore, the silicon content is generally between 0.1% and 0.4%, which helps improve the steel's oxidation resistance and strength.
Regarding impurities, the phosphorus and sulfur content in S275JR hollow tubes is strictly controlled, with phosphorus typically not exceeding 0.04% and sulfur not exceeding 0.05%. This control ensures the steel's toughness and weldability, as high phosphorus and sulfur content reduces the overall properties of the steel, leading to increased brittleness.
Chemical Composition of S275JR Steel Tube
Main Elements and Contents:
Carbon Content (C): ≤0.21.
Silicon Content (Si): ≤0.50.
Manganese Content (Mn): ≤1.50.
Phosphorus Content (P): ≤0.035.
Copper Content (Cu): ≤0.55.
Nitrogen Content (N): ≤0.012.
Mechanical Properties of S275JR Steel Pipe
Tensile Strength: Tensile strength (σb/MPa) ranges from 430 to 580 MPa.
Yield Point: Yield point (σs/MPa) ≥270 MPa.
Elongation after Fracture: Elongation after fracture (δ5/%) ≥14.
Impact Performance: Impact energy J ≥27 at an impact temperature of 20℃.
S275JR Square and Rectangular Tube Delivery Conditions and Machining Performance
Delivery Conditions: S275JR is typically delivered in hot-rolled, controlled-rolled, normalized rolled, and normalized conditions.
Machining Performance:
Cold Bending Performance: Good, easy to perform various bending processes.
Welding Performance: Excellent, suitable for various welding methods, such as manual arc welding and gas shielded welding.
Machining Performance: Good, easy to machine.
S257JR High Strength Structural Steel Tube factory
