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Structural Steel Grades Explained
The main structural steel grades and what the numbers mean.
| Grade | Yield (MPa) | Standard | Notes |
|---|---|---|---|
| S235 | 235 | EN 10025 | General mild steel |
| S275 | 275 | EN 10025 | Common structural |
| S355 | 355 | EN 10025 | High-strength structural |
| A36 | 250 | ASTM | US mild structural |
| A992 | 345 | ASTM | US wide-flange beams |
The number is the minimum yield strength in MPa. S355 is now the default for efficient structures (less steel for the same load); S235/S275 suit lighter or cost-driven work. We supply all grades as beams, plate, angle and hollow section.
Frequently asked questions
What does S355 mean?
S = structural steel, 355 = minimum yield strength of 355 MPa. It is a high-strength general structural grade.
Is S355 better than S275?
It is stronger, so it needs less steel for the same load — often more economical overall despite a higher price per tonne.
What is the ASTM equivalent of S355?
Roughly ASTM A572 Gr50 / A992 (345 MPa) — confirm exact properties against the project standard.
Need mill-certified steel in bulk?
Steel Pro Rebar Germany Gmbh exports structural steel, rebar, coil, plate and sections worldwide with EN 10204 3.1 MTCs.
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