A572 Grade 50
USApproximate matchASTM · ASTM A572/A572M
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 |
|---|---|---|---|---|---|
| A572 Grade 50 | US | ASTM A572/A572M | 345 | ≥450 | reference |
| S355J2 | EU | EN 10025-2:2019 | 355 | 470–630 | +3% |
| Neighboring grades — different strength | |||||
| A572 Grade 60 | US | ASTM A572/A572M | 414 | ≥517 | +20% |
| S420 | EU | EN 10025-2:2019 | 420 | 500–660 | +22% |
| S460M | EU | EN 10025-4:2019 | 460 | 540–720 | +33% |
| SM570 | JP | JIS G3106:2020 | 460 | 570–720 | +33% |
| SM570 | KR | KS D3515:2019 | 460 | 570–720 | +33% |
| Grade | C | Mn | Si | P | S | Cu | CEV |
|---|---|---|---|---|---|---|---|
| A572 Grade 50 | ≤0.23 | ≤1.35 | 0.15–0.4 | ≤0.03 | ≤0.03 | — | — |
| S355J2 | ≤0.2 | ≤1.6 | ≤0.55 | ≤0.03 | ≤0.03 | ≤0.55 | — |
| A572 Grade 60 | ≤0.26 | ≤1.35 | ≤0.4 | ≤0.03 | ≤0.03 | — | — |
| S420 | ≤0.2 | ≤1.7 | ≤0.6 | ≤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 | — | — |
Note: The most widely used columbium-vanadium (Nb/V) HSLA grade in the United States for framing, bridges and beams. Yield strength of 50 ksi (345 MPa), commonly treated as a functional equivalent of S355/SM570 in distributor comparison charts, although ultimate strength is slightly lower than S355 (450 MPa min vs. 470-630 MPa).
Values compiled from public sources for guidance only — always verify against the official standard before use in design or fabrication.