S355J0 vs A572 Gr.50
These two grades are listed as equivalents of each other: their chemistry windows overlap and they serve the same applications. They are not always identical — check the differences below before substituting, especially in certified designs.
S355J0
Structural & HSLA Steel
S355J0 sits between S355JR and the −20 °C grade S355J2 in the EN 10025-2 family, with a 0 °C impact guarantee. It is widely used for outdoor and transport structures in temperate-to-cold service.
Standards: DIN 1.0553 (S355J0) · AISI A572 Gr.50 (near) · JIS SM520B (near) · GB Q355B (near)
A572 Gr.50
Structural & HSLA Steel
ASTM A572 Grade 50 is the standard American HSLA structural steel — the 50 ksi yield grade that replaced A36 in most US bridge and heavy construction work. Strength comes from Nb/V microalloying and grain refinement rather than carbon, so weldability remains good.
Standards: DIN S355J2 (near) · AISI A572 Gr.50 · JIS SM520B (near) · GB Q355B (near)
Chemical composition compared (%)
| Element | S355J0 | A572 Gr.50 |
|---|---|---|
| C | ≤0.20 | ≤0.23 |
| Si | ≤0.55 | ≤0.40 |
| Mn | ≤1.60 | ≤1.35 |
| P | ≤0.030 | ≤0.035 |
| S | ≤0.030 | ≤0.045 |
| Cu | ≤0.55 | — |
| V | — | 0.01–0.15 (Type 2) |
Properties compared
| Property | S355J0 | A572 Gr.50 |
|---|---|---|
| Yield strength | ≥355 MPa (≤16 mm) | ≥345 MPa |
| Tensile strength | 470–630 MPa | ≥450 MPa |
| Impact | J0: 27 J at 0 °C | — |
| Density | 7.85 g/cm³ | 7.85 g/cm³ |
Sourcing either grade?
Nasteel stocks both families from Shenzhen with EN 10204 3.1 mill certificates by heat number.
Ask for a quotationSee full data sheets: S355J0 · A572 Gr.50. Substitution decisions for certified parts stay with the design authority.