What Is S355J2H?
S355J2H is a non-alloy, structural steel grade widely used in Europe. It’s part of the EN 10210 standard for hot-finished structural hollow sections. The designation tells us a lot:
- S355 = Minimum yield strength of 355 MPa
- J2 = Impact tested at -20°C
- H = Hollow section with specific wall thickness and guaranteed mechanical properties
S355J2H is commonly supplied as seamless or welded pipe for structural and mechanical applications.
Key Properties of S355J2H
| Property | Description |
|---|---|
| Yield Strength | Min. 355 MPa (for wall thickness ≤ 16mm) |
| Impact Resistance | 27J at -20°C (Charpy V-notch test) |
| Weldability | Excellent – low carbon content & CE value |
| Toughness | Suitable for cold regions |
| Production Standard | EN 10210-1/2 (Hot-finished structural hollow sections) |
It’s known for strength, reliability, and good performance in low temperatures.
S355J2H vs Chinese Standards: What’s the Equivalent?
The closest Chinese national standard (GB/T) equivalent is Q345D or Q355D.
| Standard | Material Grade | Impact Test | Equivalent to S355J2H? |
|---|---|---|---|
| GB/T 1591 | Q345D | -20°C | Similar but slightly lower yield strength |
| GB/T 1591 | Q355D | -20°C | Very close – similar yield and toughness |
Key differences:
- S355J2H is more strictly tested for impact strength
- European standard EN 10210 ensures tight tolerance in wall thickness and shape
- Chinese grades may vary slightly in carbon content or delivery condition
So, while they are functionally similar, S355J2H is often preferred for international projects needing full traceability and EN certification.
Where Is S355J2H Used?
S355J2H is ideal for projects that require high strength + good impact resistance, especially in cold climates.
Common applications include:
- Steel structure frames
- Bridge components
- Mechanical arms and booms
- Offshore platforms
- Cranes and lifting machinery
- Construction equipment frames
- Automotive and trailer parts
Because it’s hot-formed and offers uniform mechanical performance, S355J2H is also suitable for precision custom steel pipe structures.
How We Support S355J2H Projects
At YIGE Steel Pipe, we manufacture and supply custom S355J2H seamless and welded pipes, with:
- Sizes ranging from standard to special-shaped (square, rectangular, hexagonal, elliptical)
- Tight wall thickness control
- Third-party certification (ISO 9001, BV, etc.)
- In-house tooling & mold customization
- Support for urgent delivery and small MOQ
If you need a structural pipe with high reliability and international traceability, S355J2H is a solid choice.
Conclusion
S355J2H strikes a balance between strength, weldability, and impact toughness, making it a favorite for engineers across Europe and beyond.
Whether you’re building a crane boom, a construction frame, or a mechanical system—this steel grade is built to last.
Want to know if S355J2H suits your project? Contact our team at YIGE — we’ll guide you through materials, specifications, and even alternatives if needed.
