Compare / SM490 vs S355
SM490 vs S355
JIS G 3106 · Steel
Japanese welded-structure steel; the 490 is minimum tensile strength, yield is 325 MPa.
EN 10025-2:2019 · Steel
Europe's workhorse structural steel: 355 MPa minimum yield up to 16 mm, 470–630 MPa tensile from 3 to 100 mm.
Not equivalentUsually listed as the JIS equivalent, but its guaranteed yield is 325 MPa — 30 MPa (8 %) below S355. Fine as a tensile-class match, not for yield-governed design.
Mechanical
| Property | Condition | SM490 | S355 | Difference |
|---|---|---|---|---|
| Yield strength ReH | t = 16 mm | ≥ 325MPa1 | ≥ 355MPa3 | +9.2 % |
| t = 40 mm | ≥ 315MPa— | ≥ 345MPa3 | +9.5 % | |
| Tensile strength Rm | t = 3 mm | 490–610MPa2 | 510–680MPa3 | +4.1 % |
| t = 100 mm | 490–610MPa2 | 470–630MPa5 | −4.1 % | |
| t = 150 mm | 490–610MPa2 | 450–600MPa2 | −8.2 % | |
| t = 250 mm | 490–610MPa2 | 450–600MPa1 | −8.2 % | |
| t = 400 mm | 490–610MPa2 | 450–600MPa1 | −8.2 % |
Rows are matched by condition (thickness band, temperature, product form). A dash means the grade has no sourced value for that condition. Differences are S355 relative to SM490; for ranges the lower bound is compared.