S355J2
1.0577High-strength structural steel with impact testing at -20°C (J2). Higher toughness than S355JR (tested at +20°C). Used for bridges, crane structures, offshore platforms, and cold-weather applications where impact toughness at sub-zero temperatures is required.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | ASTM | USA | ASTM A572 Gr 50 | K02502 | REF |
| 🇪🇺 | EN | Europe | S355J2 | 1.0577 | 100% |
| 🇨🇳 | GB | China | Q355D | — | 95% |
| 🇪🇺 | DIN | Europe | St52-3 N (old) | — | 95% |
Sources: ASTM A572/A572M, EN 10025-2:2019, GB/T 1591, DIN 17100
Chemical composition comparison (wt%)
Side-by-side: S355J2 (EN) (EN 10025-2:2019) vs Q355D (GB)
| Element | S355J2 (EN) | Q355D (GB) | Overlap |
|---|---|---|---|
| C | 0–0.22% | — | — |
| Si | 0–0.55% | — | — |
| Mn | 0–1.6% | — | — |
| P | 0–0.025% | — | — |
| S | 0–0.025% | — | — |
| Cu | 0–0.55% | — | — |
| N | 0–0.012% | — | — |
Mechanical properties
General
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 470–630 | MPa |
| Yield Strength | ≥ 355 | MPa |
| Elongation | ≥ 22 | % |
| Elastic Modulus | ≥ 210 | GPa |
| Density | ≥ 7.85 | g/cm3 |
Heat treatment
| Process | Temperature | Medium | Holding Time | Notes |
|---|---|---|---|---|
| normalizing | 880–920 °C | air | min 2 min per mm | Improves toughness |
| stress_relief | 550–620 °C | furnace | 1 hour per 25mm | After welding of thick sections |
Compatibility verdict
S355J2 and Q355D: 95% composition match
Close equivalents but NOT identical.
Related materials
S355JR
1.0045High-strength low-alloy structural steel with minimum yield strength of 355 MPa. Standard grade for bridges, buildings, cranes, and general structural applications. Impact tested at +20°C (JR).
S690QL
1.8928High-strength quenched and tempered fine-grain structural steel with minimum yield strength of 690 MPa. Used for heavily loaded structures like mobile cranes, mining equipment, bridges, and pressure vessels.
S275JR
1.0044Medium-strength structural steel with minimum yield strength of 275 MPa. Bridges the gap between S235JR and S355JR. Used for general structural applications, lattice towers, masts, and light crane components. Impact tested at +20°C (JR).
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