S420
EUApproximate matchCEN · EN 10025-2:2019
Family of high-strength low-alloy (HSLA) structural steels, produced by microalloying (Nb, V, Ti) and controlled or thermomechanical rolling. Used to reduce structural weight in bridges, cranes, high-rise buildings and mobile equipment where the strength-to-weight ratio is critical.
| Grade | Region | Standard | Re (MPa) | Rm (MPa) | Delta |
|---|---|---|---|---|---|
| S420 | EU | EN 10025-2:2019 | 420 | 500–660 | reference |
| A572 Grade 60 | US | ASTM A572/A572M | 414 | ≥517 | -1% |
| S460M | EU | EN 10025-4:2019 | 460 | 540–720 | +10% |
| SM570 | JP | JIS G3106:2020 | 460 | 570–720 | +10% |
| SM570 | KR | KS D3515:2019 | 460 | 570–720 | +10% |
| Neighboring grades — different strength | |||||
| S355J2 | EU | EN 10025-2:2019 | 355 | 470–630 | -15% |
| A572 Grade 50 | US | ASTM A572/A572M | 345 | ≥450 | -18% |
| Grade | C | Mn | Si | P | S | Cu | CEV |
|---|---|---|---|---|---|---|---|
| S420 | ≤0.2 | ≤1.7 | ≤0.6 | ≤0.03 | ≤0.03 | — | — |
| A572 Grade 60 | ≤0.26 | ≤1.35 | ≤0.4 | ≤0.03 | ≤0.03 | — | — |
| S460M | 0.1–0.14 | — | — | — | — | — | 0.42–0.46 |
| SM570 | ≤0.18 | ≤1.7 | ≤0.55 | ≤0.035 | ≤0.035 | — | — |
| SM570 | ≤0.18 | ≤1.6 | ≤0.55 | ≤0.035 | ≤0.035 | — | — |
| S355J2 | ≤0.2 | ≤1.6 | ≤0.55 | ≤0.03 | ≤0.03 | ≤0.55 | — |
| A572 Grade 50 | ≤0.23 | ≤1.35 | 0.15–0.4 | ≤0.03 | ≤0.03 | — | — |
Note: Intermediate microalloyed (Nb, V) HSLA grade, normalized-rolled (N variant) or thermomechanically rolled (M variant, e.g. S420M/S420ML with a refined composition). Used for bridges, cranes and heavy structural frames requiring a weight saving over S355. Typical composition reconstructed from the published ML variant; the exact limits of the standard N variant could not be cross-checked against two reliable independent sources.
Values compiled from public sources for guidance only — always verify against the official standard before use in design or fabrication.