Comprehensive analysis of S355J2 seamless steel tube

1. Standards and specifications

International standard: Complies with European standard EN 10210-1:2006, belongs to non alloy and fine grain structural steel hot formed pipes, and some specifications need to be imported.

2. Mechanical properties

Yield strength: ≥ 355 MPa, tensile strength range 470-630 MPa 45.

Impact toughness: meets the requirements of -20 ° C low-temperature impact test (impact energy ≥ 27J), suitable for cold environments.

Endurance strength: Excellent performance under high temperature or high pressure conditions, commonly used in thermal equipment and thermal power plant pipelines.

3. Chemical composition (typical values)

Carbon (C): ≤ 0.22%, Manganese (Mn): ≤ 1.60%, Phosphorus (P)/Sulfur (S): ≤ 0.035%.

Silicon (Si): ≤ 0.55%, ensuring weldability and cold working performance.

4. Production process

Hot rolling/cold drawing process: Through continuous rolling, cold drawing or extrusion forming, the accuracy of outer diameter and wall thickness can reach ± 0.1mm.

Heat treatment: Normalization treatment enhances toughness, combined with ultrasonic testing to ensure no internal defects.

5. Application scenarios

Architecture and bridges: High precision cold drawn pipes are used for mechanical structural components such as trusses and support columns.

Energy sector: boiler tubes for thermal power plants, wind turbine tower components, and oil and gas transmission pipelines.

Heavy machinery: hydraulic cylinder barrels, transmission shafts, and load-bearing components of lifting equipment.

6. Processing and usage suggestions

Welding: Low hydrogen welding rods are recommended, and thick walled pipes (>20mm) need to be preheated to 100-150 ° C.

Cold processing: supports bending and expansion, and requires control of deformation rate to avoid cracking.

Corrosion resistance: Non weather resistant steel, requires coating or plating protection in humid environments.

7. Supplier and Market Information

Specification range: outer diameter 8-1020mm, wall thickness 1-300mm, supports customized cutting.

Precautions

Standard update: Confirm the latest version of the project location (such as EN 10210:2017).