EN 10025-2 S275JR is a high-strength low-alloy (HSLA) structural steel plate standardized under the European EN 10025-2 specification. It is widely used in construction, bridges, machinery, and general structural applications due to its good mechanical properties, weldability, and cost-effectiveness.

1. Construction Field: Used as structural materials for large public buildings, industrial plants, high-rise buildings, etc., such as H-beams and I-beams; in bridge engineering, it can be used to manufacture bridge decks, support structures, and more.

2. Mechanical Manufacturing: Can be used to produce structural components for construction machinery such as excavators, loaders, and bulldozers, as well as mining machinery like electric shovels, electric wheel dump trucks, and coal mine hydraulic supports.

3. Shipbuilding and Offshore Engineering: Suitable for ship hulls and deck structures, such as ship shells and deck beams, and can also be used in offshore platforms and port machinery to withstand harsh marine environments.

4. Energy Equipment: Can be used to manufacture pressure vessels, such as boilers and storage tanks, as well as wind turbine towers and foundation structures to endure wind loads and dynamic stresses.

Performance Characteristics:

1. High Strength and Toughness: Through alloy design and heat treatment processes, a good balance between strength and toughness is achieved, enabling it to withstand heavy loads and resist fracture under impact.

2. Good Weldability: With a low carbon equivalent (CE), it exhibits excellent welding performance. However, preheating and post-weld treatment are still required to ensure welding quality.

3. Excellent Machinability: Supports various processing techniques such as cutting, bending, and stamping. Normalizing treatment can improve microstructural uniformity, further enhancing machinability.

4. Corrosion Resistance: Optional addition of copper enhances corrosion resistance, making it suitable for harsh environments.

Equivalent Grades:

ASTM A36 (similar properties but not identical)

ISO 630 E275B

Comparison with Other Grades:

S275JR sits between S235JR (lower strength) and S355JR (higher strength), striking a good balance between strength and cost, making it a common choice for small to medium-sized structural engineering projects.

Conclusion:

EN 10025-2 S275JR is a versatile, cost-effective structural steel with balanced strength and ductility, making it ideal for general construction and industrial applications. For higher strength requirements, S355JR or S420 grades may be considered.