S355NL Material Properties Guide

S355NL Material Properties Guide

S355NL material properties and S355NL properties define this high-strength, low-alloy structural steel under EN 10025-3, making it a preferred choice for applications requiring robust performance in cold climates. Known for its fine-grain structure, excellent low-temperature toughness, and weldability, S355NL is ideal for structures like offshore platforms, wind towers, and bridges. This guide details the chemical composition, mechanical properties, weldability, and applications of S355NL, addressing core keywords s355nl material properties and s355nl properties. For more details, visit our EN 10025-3 S355NL normalized structural steel plate.

What is S355NL Steel?

S355NL 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 material properties make it suitable for demanding applications in harsh environments.

Chemical Composition Supporting Material Properties

The S355NL properties are driven by its chemical composition, optimized for strength, toughness, and weldability:

Key Elements:

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

Carbon Equivalent (CEV): ≤0.43% (≤63 mm), calculated as CEV = C + Mn/6 + (Cr + Mo + V)/5 + (Ni + Cu)/15, ensures excellent weldability, a key aspect of S355NL material properties.

Mechanical Properties of S355NL

The S355NL properties include high strength, toughness, and ductility, tailored for cold climates:

Key Mechanical Properties

• Yield Strength: ≥355 MPa (≤16 mm) ensures resistance to deformation under heavy loads, ideal for bridges and offshore platforms.
• Tensile Strength: 470-630 MPa provides durability against breaking forces.
• Elongation: ≥22% (≤63 mm) allows flexibility for complex structural designs.
• Impact Toughness: ≥27 J at -50°C (Charpy V-notch, longitudinal) ensures performance in sub-zero conditions, critical for S355NL material properties.
• Hardness: Typically 150-190 HB (Brinell), moderate due to normalization, supporting machinability.

Welding and Heat Treatment

The S355NL properties include excellent weldability:

• Welding: Compatible with GMAW (Gas Metal Arc Welding) and SAW (Submerged Arc Welding) per EN 1011-2. Preheating (100-150°C) recommended for thicknesses >20 mm; no preheat needed for thinner plates.
• Post-Weld Heat Treatment (PWHT): Optional at 550-650°C for critical welds, rarely required due to low CEV.
• Consumables: ER70S-6 (GMAW), EM12K flux with EH14 wire (SAW).

The fine-grain structure minimizes weld imperfections, enhancing the reliability of welded structures.

Applications of S355NL

The S355NL material properties make it ideal for:

• Offshore Platforms: Resists fatigue and brittle fracture in cold marine environments (e.g., Arctic seas), often with corrosion-resistant coatings.
• Wind Turbine Towers: Supports heavy loads in sub-zero climates (e.g., northern Europe), with high fatigue resistance.
• Bridges and Cranes: Load-bearing components in cold regions (e.g., Scandinavia), compliant with Eurocode 3 standards.
• Pressure Vessels: Low-temperature storage for LNG or other gases, leveraging -50°C toughness.

Explore related grades like EN 10025-3 S420NL normalized structural steel plate for higher-strength applications.

Equivalent Grades

The S355NL properties align with international equivalents:

See EN 10025-3 S355N normalized structural steel plate.

Why Choose Gangsteel for S355NL?

Gangsteel is a leading supplier of S355NL:

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

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

FAQ

What are the key S355NL material properties?
S355NL material properties include a yield strength of ≥355 MPa, tensile strength of 470-630 MPa, elongation ≥22%, impact toughness ≥27 J at -50°C, and hardness of 150-190 HB, ideal for cold-climate structural applications.

How do S355NL properties support cold climates?
S355NL properties include -50°C toughness (≥27 J), ensuring resistance to brittle fracture in arctic offshore platforms, wind towers, and bridges, with high strength for load-bearing.

Is S355NL weldable?
Yes, S355NL is highly weldable with a CEV ≤0.43%, supporting GMAW/SAW with minimal preheating (100-150°C for >20 mm), ensuring strong welds for complex structures like bridges.

What applications leverage S355NL material properties?
S355NL material properties support offshore platforms, wind turbine towers, bridges, cranes, and pressure vessels in cold climates, leveraging high strength and -50°C toughness.

How does the S355NL properties compare to S355J2?
S355NL properties include -50°C toughness for cold climates, while S355J2 is tested at -20°C for temperate regions; both have similar strength (355 MPa yield). See EN 10025-3 S355N normalized structural steel plate.

What certifications support S355NL?
S355NL comes with EN 10204 3.1/3.2 certificates, UT testing (EN 10160), and ABS/LR/BV/DNV approvals, ensuring compliance for global structural projects.