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).
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | ASTM | USA | ASTM A572 Grade 50 | K02502 | REF |
| 🇪🇺 | EN | Europe | S355JR | 1.0045 | 100% |
| 🇪🇺 | DIN | Europe | St52-3 (old) | — | 98% |
| 🇨🇳 | GB | China | Q355B | — | 95% |
| 🇬🇧 | BS | United Kingdom | BS 4360 50B | — | 92% |
| 🇯🇵 | JIS | Japan | SM490A | — | 90% |
Sources: ASTM A572/A572M, EN 10025-2:2019, DIN 17100, GB/T 1591, BS 4360, JIS G3106
Chemical composition comparison (wt%)
Side-by-side: S355JR (EN) (EN 10025-2:2019) vs ASTM A572 Grade 50 (ASTM) (ASTM A572/A572M)
| Element | S355JR (EN) | ASTM A572 Grade 50 (ASTM) | Overlap |
|---|---|---|---|
| C | 0–0.24% | 0–0.23% | OK |
| Si | 0–0.55% | 0.15–0.4% | OK |
| Mn | 0–1.6% | 0–1.35% | OK |
| P | 0–0.035% | 0–0.04% | OK |
| S | 0–0.035% | 0–0.05% | OK |
| V | — | 0.01–0.15% | — |
| Cu | 0–0.55% | — | — |
| Nb | — | 0.005–0.05% | — |
| N | 0–0.012% | — | — |
Mechanical properties
General
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 470–630 | MPa |
| Yield Strength | ≥ 355 | MPa |
| Elongation | ≥ 22 | % |
| Hardness HB | ≤ 190 | HB |
| 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 | Optional, improves toughness |
| stress_relief | 550–620 °C | furnace | 1 hour per 25mm | After welding of thick sections |
Compatibility verdict
S355JR and ASTM A572 Grade 50: 93% composition match
Close equivalents but NOT identical. Critical differences: C range (0–0.24 vs 0–0.23), Si range (0–0.55 vs 0.15–0.4), Mn range (0–1.6 vs 0–1.35), P range (0–0.035 vs 0–0.04).
For dual certification, melt must hit: C 0–0.23, Si 0.15–0.4, Mn 0–1.35, P 0–0.035
Related materials
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).
C10
1.0301Low-carbon unalloyed steel. Excellent weldability, good formability, and low hardness. Used for pins, rivets, bushings, case-hardened parts with thin case depth, and general cold-formed components. Can be case-hardened for surface wear resistance.
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