Compare / 350W vs S355
350W vs S355
CSA G40.21 · Steel
Canada's standard weldable structural grade: 350 MPa (50 ksi) yield, 450–650 MPa tensile.
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.
ApproximateYield 350 MPa (50 ksi), 5 MPa below S355, and only 46 ksi above 2½ in.; tensile 65–95 ksi. W has no guaranteed impact test; 350WT adds it.
Mechanical
| Property | Condition | 350W | S355 | Difference |
|---|---|---|---|---|
| Yield strength ReH | t = 16 mm | ≥ 350MPa1 | ≥ 355MPa3 | +1.4 % |
| t = 40 mm | ≥ 350MPa1 | ≥ 345MPa3 | −1.4 % | |
| t = 63 mm | ≥ 350MPa1 | ≥ 335MPa2 | −4.3 % | |
| t = 63.5 mm | ≥ 350MPa1 | ≥ 325MPa3 | −7.1 % | |
| t = 80 mm | ≥ 317MPa1 | ≥ 325MPa3 | +2.5 % | |
| t = 100 mm | ≥ 317MPa1 | ≥ 315MPa3 | −0.6 % | |
| t = 101.6 mm | ≥ 317MPa1 | ≥ 295MPa2 | −6.9 % | |
| Tensile strength Rm | t = 3 mm | 450–655MPa2 | 510–680MPa3 | +13 % |
| t = 100 mm | 450–655MPa2 | 470–630MPa5 | +4.4 % | |
| t = 150 mm | 450–655MPa2 | 450–600MPa2 | same | |
| t = 250 mm | 450–655MPa2 | 450–600MPa1 | same | |
| t = 400 mm | 450–655MPa2 | 450–600MPa1 | same |
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 350W; for ranges the lower bound is compared.