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
Mechanical properties
Compatibility verdict
S355JR and St52-3 (old): 98% composition match
Related materials
C45
1.0503Medium carbon unalloyed quality steel. Good machinability and moderate strength after heat treatment. Widely used for shafts, spindles, pins, studs, and general machine parts.
S235JR
1.0038General-purpose structural steel with minimum yield strength of 235 MPa. The most common structural steel grade in Europe for general construction, frames, and non-critical structural applications.
C35
1.0501Medium-carbon unalloyed steel with moderate strength. Good machinability and weldability. Used for lightly stressed components like levers, axles, bolts, and general machine parts.
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