S275J2 S355J2 HEA360 Large size H beam
Chemical composition and standards
S275J2 and S355J2 are both European standard low alloy steels, in line with EN 10025 standards.
S275J2 h section steel: C≤0.22%, Si≤0.55%, Mn≤1.60%, P/S≤0.025%, yield strength ≥275MPa (when thickness ≤16mm).
S355J2 h shaped steel: C≤0.22%, Mn≤1.60%, added Nb/V microalloy elements, yield strength ≥355MPa (when thickness ≤16mm), tensile strength 450-680MPa.
Difference comparison: S355J2 has higher strength and better impact toughness (-20℃ impact energy ≥27J), suitable for heavy load and low temperature environment.
Heat treatment and processability
1. Both S275J2/S355J2 material h beam support normalizing (+N) process to improve grain uniformity, weldability and fatigue resistance.
2. Low carbon equivalent (S355J2 CEV≤0.41%), excellent compatibility with arc welding and submerged arc welding, and stable toughness of welded joints.
3. Supports flame cutting, laser cutting and other processes, with high surface finish, which can meet the needs of complex structures.
HEA360 steel structure parameters
| parameter |
Specifications (Based on S355J2 material) |
Remark |
|---|---|---|
| Cross-section height (h) | 350 mm | Adapt to large span and heavy load scenarios |
| Flange width (b) | 300 mm | Enhanced bending stability |
| Web thickness (s) | 10 mm | Optimized shear performance |
| Flange thickness (t) | 17.5 mm | Outstanding local pressure bearing capacity |
| Unit weight | Approx. 112 kg/m | Significant weight-to-strength ratio advantage |
Mechanical properties
| Performance Category | S275J2 h beam material | S355J2 h section beam |
|---|---|---|
| Yield Strength | ≥275MPa (thickness ≤16mm) | ≥355MPa (thickness ≤16mm) |
| tensile strength | 360-530MPa | 450-680MPa |
| Elongation after fracture | ≥17% | ≥22% |
| Low Temperature Impact Energy | -20℃≥27J | -20℃≥27J (better stability) |
