S420N
1.8902Normalized fine-grain structural steel — ReH >=420 MPa with Charpy at -20°C (KV >=27J). Between S355N and S460N. Fine grain from Al/Nb/V micro-alloying + normalizing. Used for bridges, crane structures, pressure vessels, and heavy structural applications where TM-rolling (ML grades) is not available or where normalizing is required by code.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇪🇺 | EN | Europe | S420N / 1.8902 | 1.8902 | 100% |
Sources: EN 10025-3
Chemical composition comparison (wt%)
Side-by-side: S420N (EN 10025-3) vs S420N / 1.8902 (EN) (EN 10025-3)
| Element | S420N (EN 10025-3) | S420N / 1.8902 (EN) | Overlap |
|---|---|---|---|
| C | — | 0–0.2% | — |
| Si | — | 0–0.5% | — |
Mechanical properties
Compatibility verdict
S420N and S420N / 1.8902: 100% 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.
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).
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.
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