EN 10025-3 S355N High-strength Low-alloy (HSLA) Steel Plate

EN10025-3 S355N High-strength Low-alloy (HSLA) Steel Plate is normalized/normalized rolled weldable fine grain structural steel plate under the European standard.

Standard and Grade Designation

Standard: EN 10025-3 (European Norm for hot-rolled structural steel products)

Material Type: High-strength low-alloy (HSLA) steel

Grade: S355N

"S" = Structural steel

"355" = Minimum yield strength of 355 MPa at room temperature (16mm thickness)

"N" = Normalized rolled (thermomechanical processing for improved toughness)

Advantages：

✔ Higher strength-to-weight ratio vs. mild steel (e.g., S235)

✔ Better toughness at low temperatures (suitable for cold climates)

✔ Good weldability & machinability (with proper procedures)

1. Buildings and bridges, such as high-rise building frameworks, bridge girders, and piers;

2. Heavy machinery, such as cranes, steam turbines, excavators, and other components;

3. Energy facilities, such as oil and gas pipelines, storage tanks, and liquefied natural gas (LNG) tanks;

4. Marine engineering, such as offshore platforms and coastal structures;

5. Pressure vessels, such as medium-pressure boilers, high-pressure boilers, and high-pressure containers;

6. Railway vehicles, mining machinery, metallurgical and environmental protection equipment, etc.

Comparison with Other S355 Grades:

S355JR (EN 10025-2): Non-alloy, general-purpose structural steel (not normalized).

S355NL (EN 10025-3): Similar to S355N but with improved low-temperature toughness (tested at -50°C).

S355M (EN 10025-4): Thermomechanically rolled steel (higher strength without heat treatment).