S355NL Mechanical Properties Overview

S355NL mechanical properties define its suitability as a high-strength, low-alloy structural steel under EN 10025-3, a European standard for normalized or normalized rolled weldable fine grain structural steels. Known for its excellent strength, toughness, and ductility, S355NL properties make it ideal for demanding applications in cold climates, such as offshore platforms, wind towers, and bridges.

This article provides a detailed overview of S355NL steel properties, including yield strength, tensile strength, elongation, and low-temperature toughness, addressing core keywords s355nl mechanical properties, s355nl properties, and s355nl steel 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 properties are optimized for applications requiring reliability in cold and high-stress environments.

S355NL Mechanical Properties

The S355NL mechanical properties include high yield strength, robust tensile strength, good elongation, and exceptional low-temperature toughness. These properties are critical for structural integrity in demanding applications. Below is a detailed table of S355NL steel properties as per EN 10025-3:

Key Mechanical Properties

• Yield Strength: ≥355 MPa (≤16 mm), ensuring the steel can withstand significant loads before deformation.
• Tensile Strength: 470-630 MPa, providing robust resistance to breaking under tension.
• Elongation: ≥22% (≤63 mm), indicating good ductility for forming and shaping.
• Impact Toughness: ≥27 J at -50°C (Charpy V-notch, longitudinal), critical for performance in sub-zero environments.

These S355NL properties make it suitable for high-stress, cold-climate applications.

Chemical Composition Supporting S355NL Properties

The S355NL mechanical properties are supported by its chemical composition, optimized for strength and toughness:

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

Welding and Heat Treatment

The S355NL properties include excellent weldability due to low CEV:

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

The fine-grain structure enhances weld integrity, a key aspect of S355NL mechanical properties.

Applications of S355NL Steel

The S355NL steel properties make it ideal for:

• Offshore Platforms: Resists fatigue in cold marine environments.
• Wind Turbine Towers: Supports heavy loads in sub-zero climates.
• Bridges and Cranes: Load-bearing components in northern regions.
• Pressure Vessels: For low-temperature storage systems.

Its Eurocode 3 compliance ensures safe, efficient designs. Explore related grades like EN 10025-3 S420NL normalized structural steel plate.

Equivalent Grades

The S355NL properties align with:

See EN 10025-3 S355N normalized structural steel plate.

Why Choose Gangsteel for S355NL?

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 are the S355NL mechanical properties?
Yield ≥355 MPa, tensile 470-630 MPa, elongation ≥22%, impact ≥27 J at -50°C.

What defines S355NL properties?
High strength, low-temp toughness, and weldability due to fine-grain structure.

How do S355NL steel propertiessuit cold climates?
≥27 J at -50°C ensures reliability in arctic conditions.

Is S355NLweldable?
Yes; low CEV (≤0.43%) supports GMAW/SAW with minimal preheating.

What are applications of S355NL?
Offshore platforms, wind towers, and cold-region bridges.

How does S355NLcompare to S355J2?
S355NL is normalized, tested at -50°C; S355J2 is hot-rolled, tested at -20°C. See EN 10025-3 S275N normalized structural steel plate.