S355NL Standard and Compliance

S355NL Standard and Compliance

S355NL standard refers to EN 10025-3, the European standard governing normalized or normalized rolled weldable fine grain structural steels, under which S355NL is specified as a high-strength, low-alloy steel. S355NL specifications outline its chemical composition, mechanical properties, and delivery conditions, ensuring compliance with stringent requirements for applications in cold climates, such as offshore platforms and bridges. This article details the EN 10025-3 standard, S355NL specifications, compliance certifications, and applications, addressing core keywords s355nl standard and s355nl specifications. For more details, visit our EN 10025-3 S355NL normalized structural steel plate.

What is the S355NL Standard?

The S355NL standard is EN 10025-3:2019, part of the EN 10025 series specifying technical delivery conditions for hot-rolled structural steels. EN 10025-3 focuses on normalized or normalized rolled fine-grain structural steels, including grades like S275N/NL, S355N/NL, S420N/NL, and S460N/NL. S355NL is a key grade with:

• S: Structural steel.
• 355: Minimum yield strength of 355 MPa (≤16 mm).
• NL: Normalized, with impact toughness tested at -50°C.

The standard ensures S355NL’s suitability for demanding structural applications through rigorous testing and quality controls.

S355NL Specifications: Chemical Composition

The S355NL specifications define a chemical composition optimized for strength, toughness, and weldability:

Key Elements:

• Low Carbon (C): ≤0.18% ensures toughness and weldability.
• Manganese (Mn): 0.90-1.65% enhances strength.
• Aluminum (Al), Niobium (Nb): Promote fine-grain structure for toughness.
• Low Sulfur (S) and Phosphorus (P): Minimize inclusions for 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 standard.

S355NL Specifications: Mechanical Properties

The mechanical properties of S355NL support its structural use:

• Yield Strength: ≥355 MPa (≤16 mm) for load-bearing capacity.
• Tensile Strength: 470-630 MPa for durability.
• Elongation: ≥22% for ductility.
• Impact Toughness: ≥27 J at -50°C for cold climates.
• Hardness: Typically 150-190 HB (Brinell) for machinability.

S355NL Standard: Delivery Conditions and Compliance

The S355NL standard specifies:

• Condition: Normalized (+N) or normalized rolled, ensuring 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 certificates for traceability and quality.
  • Ultrasonic testing (UT) per EN 10160 (optional) for internal quality.
  • Compliance with classification societies (e.g., ABS, LR, BV, DNV) for marine and offshore use.
  • Optional Z-quality (Z15, Z25, Z35) per EN 10164 for through-thickness properties, reducing lamellar tearing risk.
• Standards Compliance: Meets Eurocode 3 for structural design and PED (Pressure Equipment Directive) for pressure vessels when applicable.

Welding and Heat Treatment

S355NL specifications ensure weldability:

• 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).

Applications

S355NL is used in:

• Offshore Platforms: Cold marine environments (e.g., Arctic seas).
• Wind Turbine Towers: Sub-zero climates (e.g., northern Europe).
• Bridges and Cranes: Cold regions (e.g., Scandinavia).
• Pressure Vessels: Low-temperature storage (e.g., LNG systems).

Explore 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:

• 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 standard?
The S355NL standard is EN 10025-3:2019, specifying normalized fine-grain structural steels with 355 MPa yield, -50°C toughness, and weldability for cold-climate applications.

What are the S355NL specifications?
S355NL specifications include yield strength ≥355 MPa, tensile strength 470-630 MPa, elongation ≥22%, impact toughness ≥27 J at -50°C, CEV ≤0.43%, and thickness 6-250 mm.

How does S355NLensure compliance?
S355NL complies with EN 10025-3, offering EN 10204 3.1/3.2 certificates, UT testing (EN 10160), and approvals from ABS/LR/BV/DNV for structural and marine use.

What applications use the S355NL standard?
The S355NL standard supports offshore platforms, wind towers, bridges, and pressure vessels in cold climates, leveraging -50°C toughness and high strength.

Is S355NLweldable?
Yes, S355NL is highly weldable with CEV ≤0.43%, supporting GMAW/SAW with minimal preheating (100-150°C for >20 mm) per S355NL specifications.

How does S355NLcompare to S355J2?
S355NL is normalized, tested at -50°C for cold climates; S355J2 is hot-rolled, tested at -20°C for temperate regions. See EN 10025-3 S355N normalized structural steel plate.