EN10025-2 S355NL steel plate

EN10025-2 S355NL is a structural steel grade from the European EN 10025 standard, but this is an error in the query, as S355NL falls under the EN 10025-3 part of the standard. It is a hot-rolled, low-carbon manganese steel characterized by its fine grain structure, good weldability, and excellent impact resistance at sub-zero temperatures down to -50°C.

The “S355” signifies a minimum yield strength of 355 MPa, while “N” denotes a normalized condition, and “L” indicates low-temperature impact properties.

Characteristics of EN10025-2 S355NL Steel Plate

Balanced High Strength and Toughness

• Yield strength: ≥355 MPa (ranging from 275-355 MPa under certain standards), tensile strength: 470-630 MPa, and elongation at fracture: 21-22%.
• Low-temperature toughness: Maintains specified minimum impact energy at -50°C (NL grade), making it suitable for extremely cold regions or low-temperature operating conditions.

Excellent Weldability
The reasonable proportion of carbon content and alloying elements (e.g., silicon, manganese) minimizes cracking or porosity during welding, supporting various welding processes (e.g., manual arc welding, gas metal arc welding).

Corrosion and Weather Resistance
Enhanced service life in humid or corrosive environments through the addition of chromium, molybdenum, copper, and other elements.

Fine-Grained Structure
Normalizing or normalizing rolling processes refine grain size, improve material uniformity, and ensure stable mechanical properties.

Outstanding Machinability
Supports flame cutting, laser cutting, cold bending, stamping, and other fabrication methods, with a reduction of area reaching 45-55%, meeting the demands of complex structural manufacturing.

Applications of EN10025-2 S355NL Steel Plate

Infrastructure for Extreme Environments

• Cold-region construction: Structures such as Arctic Circle bridges and high-rise building frames in alpine regions, withstanding wind, snow loads, and low-temperature brittleness risks.
• Low-temperature storage equipment: LNG storage tanks and frozen food warehouse bodies, capable of enduring pressures from cryogenic media at -196°C.

Energy Equipment Manufacturing

• Wind power equipment: Tower tubes for wind turbines above 3 MW (e.g., Vestas V150 models), enduring strong wind loads and dynamic fatigue.
• Nuclear power pressure vessels: Meeting ASME standards for high strength, ensuring structural safety in radiation environments.
• Oil and gas pipelines: High-pressure and corrosion-resistant properties suitable for long-distance pipeline systems.

Specialized Engineering Structures

• Polar research stations: Support structures must adapt to temperatures below -50°C and highly corrosive sea winds.
• Deep-sea drilling platforms: Such as the hulls of Russia’s Project 22220 icebreakers, resisting seawater corrosion and ice impacts.

Transportation Infrastructure and Heavy Machinery

• Railway bridges: Components for bridges on the Qinghai-Tibet Railway, ensuring long-term stability under complex geological conditions.
• Construction machinery: Key parts like excavator booms, loader buckets, and crane towers, withstanding high stress and impact.
• Mining equipment: Bodies of mining trucks and hammer mounts for crushers, adapted to harsh operating conditions and heavy loads.

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FAQ

What is S355NL steel grade?
S355NL is a hot rolled, medium tensile, low carbon manganese steel which is readily weldable and possess good impact resistance (also in sub-zero temperatures).

What is the difference between S355J2 and S355NL?
S355J2: Requires preheating for thick sections (>30 mm). S355NL: Better weldability due to fine grain and low impurities; suitable for critical welds without extensive preheating. Choose S355J2 for cost-effective, general-purpose structures in moderate climates.

What temperature is the impact test for S355NL?
In the second,S355J2 steel plate shall be done charpy impacting test at low temperature minus 20 Degree Celsius,but S355NL steel plate shall be done this test at low temperature minus 50 Degree Celsius with minimum impact energy value 27J on longitudinal. Alt min. Mpa Min.