EN 10025-2 S235J0 is a High-strength Low-alloy (HSLA) structural steel plate standardized under the European EN 10025-2 specification. It is designed for improved mechanical properties and weldability compared to standard carbon steels.

Steel Type: High-Strength Low-Alloy (HSLA) – Contains small alloying additions (e.g., Nb, V, Ti) for better strength and toughness.

Standard and Grade Designation

Standard: EN 10025-2 (Hot-rolled structural steel products)

Material Grade: S235J0

"S" = Structural steel

"235" = Minimum yield strength (235 MPa) at ≤16mm thickness

"J0" = Impact toughness requirement at 0°C (minimum 27 Joules in Charpy V-notch test)

Key Features:

✔ Good weldability (low carbon equivalent)

✔ Improved toughness at low temperatures (J0 grade tested at 0°C)

✔ Higher strength-to-weight ratio compared to mild steel

✔ Suitable for structural applications (buildings, bridges, machinery)

S235J0 is widely used due to its moderate strength, good plasticity and toughness (especially at 0°C), and low cost. Its applications include:

1. Building structures: Load-bearing components such as factory buildings, warehouses, and frame structures.

2. Bridges and municipal engineering: Components like bridge supports and guardrails.

3. Mechanical manufacturing: Parts that do not require high strength, such as equipment frames, bases, and casings.

4. Steel structure fabrication: Welded or riveted structural components (this grade has good weldability and typically requires no preheating or only minimal preheating).

Equivalent Standards:

ISO 630: Fe360B

ASTM A36 (similar but not identical)

JIS G3101: SS400

Comparison with Similar Grades:

Conclusion:

EN 10025-2 S235J0 is a cost-effective HSLA steel with good strength, weldability, and low-temperature toughness, making it suitable for structural applications where moderate strength and impact resistance are required.