S355NL Steel Plate Specifications

S355NL Steel Plate Specifications

S355NL plate, S355NL steel plate, and S355NL specification refer to the technical details of this high-strength, low-alloy structural steel under EN 10025-3, a European standard for normalized or normalized rolled weldable fine grain structural steels. Renowned for its excellent toughness, weldability, and strength in cold climates, S355NL is ideal for applications like offshore platforms and bridges. This article provides a comprehensive overview of the S355NL specification, including chemical composition, mechanical properties, delivery conditions, and applications, addressing core keywords s355nl plate, s355nl steel plate, and s355nl specification. For more details, visit our EN 10025-3 S355NL normalized structural steel plate.

What is S355NL Steel Plate?

S355NL steel plate is a fine-grain structural steel under EN 10025-3, designed for high strength and low-temperature performance. Its designation indicates:

• S: Structural steel.
• 355: Minimum yield strength of 355 MPa for thicknesses up to 16 mm.
• NL: Normalized or normalized rolled, with impact toughness tested at -50°C.

The S355NL specification ensures reliability in demanding environments, making it suitable for cold-climate structural applications.

S355NL Specification: Chemical Composition

The S355NL plate chemical composition is tightly controlled to ensure strength, toughness, and weldability:

Key Elements:

• Low Carbon (C): ≤0.18% ensures toughness and weldability, reducing brittleness.
• Manganese (Mn): 0.90-1.65% enhances strength for load-bearing applications.
• Aluminum (Al), Niobium (Nb): Promote fine-grain structure for low-temperature toughness.
• Low Sulfur (S) and Phosphorus (P): Minimize inclusions, improving weld quality.

Carbon Equivalent (CEV): ≤0.43% (≤63 mm), calculated as CEV = C + Mn/6 + (Cr + Mo + V)/5 + (Ni + Cu)/15, ensures excellent weldability per the S355NL specification.

S355NL Specification: Mechanical Properties

The mechanical properties of S355NL steel plate are critical for its structural applications:

• Yield Strength: ≥355 MPa (≤16 mm) supports heavy loads in structures like bridges.
• Tensile Strength: 470-630 MPa ensures durability under tension.
• Elongation: ≥22% allows ductility for complex designs.
• Impact Toughness: ≥27 J at -50°C (Charpy V-notch) ensures performance in cold climates.
• Hardness: Typically 150-190 HB (Brinell), moderate for machinability.

S355NL Specification: Delivery Conditions

The S355NL specification includes:

• Standard: EN 10025-3:2019.
• Condition: Normalized (+N) or normalized rolled, ensuring a fine-grain microstructure.
• Thickness Range: 6–250 mm.
• Widths: 2000, 2500, 3000 mm (standard).
• Lengths: Up to 12,000 mm.
• Surface: Hot-rolled, optional priming for corrosion resistance.
• Certifications: EN 10204 3.1/3.2, UT testing (EN 10160 optional).
• Z-Quality (Optional): Z15, Z25, Z35 for through-thickness properties, reducing lamellar tearing risk in heavy welds.

Welding and Heat Treatment

S355NL plate is highly weldable:

• Welding: Compatible with GMAW and SAW per EN 1011-2. Preheating (100-150°C) for >20 mm; no preheat for thinner plates.
• PWHT: Optional at 550-650°C for critical welds.
• Consumables: ER70S-6 (GMAW), EM12K flux with EH14 wire (SAW).

The fine-grain structure ensures weld integrity, supporting complex fabrications.

Applications of S355NL Steel Plate

The S355NL specification makes it ideal for:

• Offshore Platforms: Resists fatigue in cold marine environments (e.g., Arctic seas).
• Wind Turbine Towers: Supports sub-zero loads in northern climates.
• Bridges and Cranes: Load-bearing components in cold regions (e.g., Scandinavia).
• Pressure Vessels: Low-temperature storage for LNG or gases.

Explore related grades like EN 10025-3 S420NL normalized structural steel plate.

Equivalent Grades

See EN 10025-3 S355N normalized structural steel plate.

Why Choose Gangsteel?

Gangsteel supplies S355NL steel plate:

• Inventory: Extensive stock in China.
• Sizes: Thickness 6–250 mm, widths 2000/2500/3000 mm, lengths up to 12,000 mm.
• Delivery: 7-30 days globally.
• Certifications: EN 10204 3.1/3.2, UT testing (EN 10160), ABS/LR/BV/DNV approvals.
• Processing: Cutting, welding, bending.

Contact us for EN 10025-3 S355NL normalized structural steel plate.

FAQ

What is the S355NL specification?
The S355NL specification under EN 10025-3 includes yield strength ≥355 MPa, tensile strength 470-630 MPa, elongation ≥22%, impact toughness ≥27 J at -50°C, and CEV ≤0.43% for weldability, ideal for cold-climate structures.

What are the dimensions of S355NL plate?
S355NL plate is available in thicknesses 6–250 mm, widths 2000/2500/3000 mm, and lengths up to 12,000 mm, suitable for large-scale applications like offshore platforms.

How weldable is S355NL steel plate?
S355NL steel plate is highly weldable with CEV ≤0.43%, supporting GMAW/SAW with minimal preheating (100-150°C for >20 mm), ensuring robust welds for bridges and wind towers.

What applications use S355NL plate?
S355NL plate is used in