EN 10219 S355J2H pipe belongs to the European standard cold-formed structural hollow steel. Its main performance indicators and Chinese material benchmarking relationship and key characteristics are as follows:
1. Core benchmarking relationship
National standard equivalent grade:
Q345D (some manufacturers mark it as Q355D) is its closest domestic corresponding steel grade, and both must meet the -20℃ low temperature impact toughness requirements (≥27J).
Key difference: The upper limit of phosphorus (P) and sulfur (S) content of S355J2H (≤0.025%) is stricter than Q345D (P≤0.030%, S≤0.025%), and the sensitivity to welding hot cracking is lower.
2. Performance Parameters Comparison
| Features | S355J2H | Q345D |
|---|---|---|
| Yield Strength | ≥355MPa(thickness ≤16mm)to ≥265MPa(thickness 250-400mm) | ≥345MPa(thickness ≤16mm) |
| Tensile strength | 470-630MPa | 470-630MPa |
| Low temperature toughness | -20℃ impact energy ≥27J (standard requirement) | -20℃ impact energy ≥34J (actual test is stricter) |
| Elongation | ≥22%(thickness ≤40mm) | ≥21% |
3. Chemical composition control (%)
| Elements | S355J2H Upper limit | Q345D Upper limit | Function |
|---|---|---|---|
| C | ≤0.22 | ≤0.18 | Weldability and strength balance |
| Mn | ≤1.60 | ≤1.70 | Solid solution strengthening |
| P | ≤0.025 | ≤0.030 | Cold brittleness control |
| S | ≤0.025 | ≤0.025 | Thermal crack suppression |
4. Typical application scenarios
Construction engineering: high-rise steel structure support column (30% weight reduction and earthquake resistance);
Bridge engineering: main beam of cross-sea bridge (salt spray corrosion resistance + low temperature toughness guarantee);
Heavy machinery: crane boom pipe (fatigue life >10⁶ cycles).
5. Precautions for use
Welding process: Thick-walled pipe (>25mm) requires 150℃ preheating + low-hydrogen welding rod;
Anti-corrosion treatment: Galvanized layer is required for marine environment (salt spray resistance >500 hours);
Acceptance standard: EN10204-3.1 warranty + ultrasonic flaw detection report (EN10219 Level B) is required
