S355JR and S355J2H Round Seamless Steel Tubes for Structural Applications
1. Product Description:
S355JR and S355J2H Round Seamless Steel Tubes are engineered for structural applications that require high strength and ductility. These tubes are manufactured from low alloy steel and are seamless, ensuring uniform wall thickness and superior structural integrity. The S355 designation indicates the minimum yield strength of 355 MPa, while the JR and J2H grades denote varying levels of impact resistance.
2. Product Features:
- Seamless Construction: Provides consistent wall thickness and enhanced resistance to pressure.
- High Yield Strength: Offers a minimum yield strength of 355 MPa for robust structural support.
- Impact Resistance: J2H grade has enhanced impact resistance for use in colder environments.
- Weldability: Suitable for welding, facilitating easy integration into structural frameworks.
- Corrosion Resistance: Offers resistance to atmospheric corrosion for extended service life.
3. Product Parameters:
Parameter | Description |
Standards | EN 10210-2 (for seamless tubes) |
Material | Low Alloy Steel (Seamless) |
Grades | S355JR, S355J2H |
Shape | Round |
Size Range | Various diameters and wall thicknesses as per EN 10210-2 |
Length | Standard lengths, customizable upon request |
Ends | Plain ends, beveled ends, threaded, or socket-weld ends |
Surface Treatment | As-rolled, annealed, or normalized |
4. Mechanical Properties:
Property | S355JR Requirements | S355J2H Requirements |
Tensile Strength | ≥440 MPa | ≥440 MPa |
Yield Strength | ≥235 MPa | ≥235 MPa |
Elongation | ≥21% | ≥21% |
Impact Energy | Varies by grade | Enhanced for J2H |
5. Chemical Composition:
Element | Typical Range (%) |
Carbon | 0.16 - 0.24 |
Manganese | 1.00 - 1.70 |
Phosphorus | ≤0.025 |
Sulfur | ≤0.025 |
Silicon | ≤0.50 |
6. Product Applications:
- Structural Framing: Used in building and construction for structural framing.
- Mechanical Equipment: Ideal for manufacturing equipment that requires a strong and stable framework.
- Piping Systems: Suitable for use in industrial piping systems for various fluids.
- Infrastructure Projects: Employed in bridges, highways, and other large-scale infrastructure projects.


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