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Overview
EN 10210 is a European standard that specifies hot-finished structural hollow sections (steel pipes, square/rectangular tubes) made from non-alloy and fine-grain structural steels. The S355 grades indicate high-strength steel with a minimum yield strength of 355 MPa. The suffixes (J0H, J2H, K2H) denote different toughness levels and testing conditions.
EN 10210 S355 Steel Grades Pipes
- Standard: EN 10210
- Grade: S355J0H, S355J2H, S355K2H
- Outside Diameter:
1/2 INCH - 24 INCH(CHS)
20MM × 20MM - 1200MM × 1200MM(SHS)
20MM × 30MM - 1000MM × 1500MM(RHS)
- Wall Thickness:
1.3MM - 22MM(CHS)
1.3MM - 50MM(SHS,RHS)
- The Wall Thickness Tolerance: control within the standard limits
- Length: Normally used 5.8m, 6m, 12m
- Surface Treatment: Bare Finish, Painting, Oiling, Galvanization, 3PE, FBE coated, etc.
-
Applications: Construction, Mechanical Engineering, Automotive, Offshore and Marine, Pipeline Systems.
Material Grades & Key Differences
| Grade | Impact Test Temperature | Charpy V-Notch (Min. Energy) | Notable Properties |
|---|---|---|---|
| S355J0H | 0°C (optional at -20°C for certain applications) | 27 J | Standard toughness for general structural use. |
| S355J2H | -20°C | 27 J | Improved low-temperature toughness for cold climates. |
| S355K2H | -20°C | 40 J | Higher impact energy, suitable for critical/welded structures. |
Chemical Composition and Mechanical Properties
Chemical Composition (Typical, EN 10210-1)
- Carbon (C): ≤ 0.22%
- Manganese (Mn): ≤ 1.60%
- Silicon (Si): ≤ 0.55%
- Phosphorus (P): ≤ 0.035%(S355J0H);≤ 0.030%(S355J2H, S355K2H)
- Sulfur (S): ≤ 0.035%(S355J0H);≤ 0.030%(S355J2H, S355K2H)
- Microalloying (Nb, V, Ti): Optional for enhanced strength.
(Exact composition varies by manufacturer and heat treatment.)
Mechanical Properties (EN 10210-2)
| Property | S355J0H/J2H/K2H (Typical Values) |
|---|---|
| Yield Strength (ReH) | ≥ 355 MPa (thickness≤16mm) |
| Tensile Strength (Rm) | 470–630 MPa (thickness＞3mm,≤100mm) |
| Elongation (A₅) | ≥ 22% (thickness≤40mm) |
| Impact Energy | As per grade (27J or 40J at specified temps) |
Characteristics：
- S355J0H: This grade is characterized by its good weldability and formability. It is suitable for general structural applications where high impact resistance is not a primary concern.
- S355J2H: This grade offers improved impact resistance compared to S355J0H, making it suitable for applications that may experience higher stress levels or dynamic loads.
- S355K2H: This grade provides the highest level of impact resistance among the three. It is ideal for applications in cold environments or where the steel pipe may be subjected to severe mechanical stress.
Manufacturing Process
Hot-finished: Pipes are formed at high temperatures (seamless or welded), improving uniformity and structural integrity.
Normalized/Normalized-rolled: Enhances mechanical properties and toughness.
Standards & Certifications
Complies with EN 10210-1 (Material) and EN 10210-2 (Dimensions/Tolerances).
Optional certifications: CE Marking, ISO 9001, EN 1090 (Execution Class).
Advantages and Applications
Advantages
- High strength-to-weight ratio.
- Excellent weldability and machinability.
- Grades like J2H/K2H offer superior low-temperature performance.
Applications
- Construction: Building frames, bridges, offshore structures.
- Heavy machinery: Cranes, transport equipment.
- Cold environments: S355J2H/K2H are preferred for Arctic/low-temperature applications.
- Welded structures: S355K2H's higher impact energy reduces brittle fracture risk.
Conclusion
EN 10210 S355 grade steel pipes, including S355J0H, S355J2H, and S355K2H, are essential materials in modern engineering and construction. Their balanced combination of strength, ductility, and impact resistance makes them versatile and reliable for a wide range of applications. Whether used in structural frameworks, industrial machinery, or pipeline systems, these steel pipes offer excellent performance and durability.
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