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) (EN 10025-3) vs S420N / 1.8902 (EN) (EN 10025-3)
| Element | S420N (EN) | S420N / 1.8902 (EN) | Overlap |
|---|---|---|---|
| C | 0–0.2% | 0–0.2% | OK |
| Si | 0–0.5% | 0–0.5% | OK |
| Mn | 0–1.7% | 0–1.7% | OK |
| V | 0–0.12% | 0–0.12% | OK |
| Al | ≥ 0.02% | ≥ 0.02% | OK |
| Nb | 0–0.05% | 0–0.05% | OK |
Mechanical properties
Normalized
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 520–680 | MPa |
| Yield Strength | ≥ 420 | MPa |
| Elongation | ≥ 18 | % |
| charpy_impact_minus20 | ≥ 27 | J |
| Elastic Modulus | ≥ 210 | GPa |
| Density | ≥ 7.85 | g/cm3 |
Compatibility verdict
S420N and S420N / 1.8902: 100% 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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