S355K2 vs S355J0
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.
S355K2
Structural & HSLA Steel
S355K2 is the high-toughness quality of S355 to EN 10025-2. Where S355J2 guarantees 27 J at −20 °C, K2 raises the bar to 40 J at −20 °C, which designers use for fracture-sensitive, dynamically loaded or thick welded structures.
Standards: DIN 1.0596 (S355K2) · AISI A572 Gr.50 (near) · JIS SM520C (near) · GB Q355D class (near)
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)
Chemical composition compared (%)
| Element | S355K2 | S355J0 |
|---|---|---|
| C | ≤0.20 | ≤0.20 |
| Si | ≤0.55 | ≤0.55 |
| Mn | ≤1.60 | ≤1.60 |
| P | ≤0.025 | ≤0.030 |
| S | ≤0.025 | ≤0.030 |
| Cu | ≤0.55 | ≤0.55 |
Properties compared
| Property | S355K2 | S355J0 |
|---|---|---|
| Yield strength | ≥355 MPa (≤16 mm) | ≥355 MPa (≤16 mm) |
| Tensile strength | 470–630 MPa | 470–630 MPa |
| Impact | 40 J at −20 °C | 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: S355K2 · S355J0. Substitution decisions for certified parts stay with the design authority.