SM570
JPApproximate matchJIS · JIS G3106:2020
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 |
|---|---|---|---|---|---|
| SM570 | JP | JIS G3106:2020 | 460 | 570–720 | reference |
| S460M | EU | EN 10025-4:2019 | 460 | 540–720 | 0% |
| SM570 | KR | KS D3515:2019 | 460 | 570–720 | 0% |
| S420 | EU | EN 10025-2:2019 | 420 | 500–660 | -9% |
| A572 Grade 60 | US | ASTM A572/A572M | 414 | ≥517 | -10% |
| Neighboring grades — different strength | |||||
| S355J2 | EU | EN 10025-2:2019 | 355 | 470–630 | -23% |
| A572 Grade 50 | US | ASTM A572/A572M | 345 | ≥450 | -25% |
| Grade | C | Mn | Si | P | S | Cu | CEV |
|---|---|---|---|---|---|---|---|
| SM570 | ≤0.18 | ≤1.7 | ≤0.55 | ≤0.035 | ≤0.035 | — | — |
| S460M | 0.1–0.14 | — | — | — | — | — | 0.42–0.46 |
| SM570 | ≤0.18 | ≤1.6 | ≤0.55 | ≤0.035 | ≤0.035 | — | — |
| S420 | ≤0.2 | ≤1.7 | ≤0.6 | ≤0.03 | ≤0.03 | — | — |
| A572 Grade 60 | ≤0.26 | ≤1.35 | ≤0.4 | ≤0.03 | ≤0.03 | — | — |
| 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: The strongest HSLA grade of the SM series (SM400/SM490/SM520/SM570), produced by microalloying and controlled rolling. Used for cranes, booms, chassis, bridges and buildings. Several distributor comparison charts place it close to S460M (EN) and A572 Gr60 (ASTM) in strength, but no standard asserts a strict compositional equivalence — treat this as an approximate performance match only.
Values compiled from public sources for guidance only — always verify against the official standard before use in design or fabrication.