S355NL Steel Properties and Applications

S355NL Steel Properties and Applications

At Gangsteel, we’re thrilled to present a comprehensive guide to S355NL steel properties and applications, showcasing this high-strength, low-alloy structural steel under EN 10025-3. Renowned for its fine-grain structure, 355 MPa yield strength, and exceptional -50°C toughness, S355NL is a top choice for demanding structural projects in cold climates, such as offshore platforms, wind towers, and arctic bridges.

As part of the en 10025 3 normalized steel plate family, S355NL delivers reliable performance. Gangsteel explores its chemical composition, mechanical properties, delivery conditions, and applications, comparing it to grades like en 10025 3 s355n normalized structural steel plate and en 10025 3 s460n normalized structural steel plate. For more details, contact us or visit our en 10025 3 s355nl normalized structural steel plate page.

What is S355NL Steel?

S355NL is a high-strength, low-alloy structural steel under EN 10025-3:2019, with a minimum yield strength of 355 MPa for plates up to 16 mm thick. Its designation, also known as material number 1.0546, breaks down as:

• S: Structural steel.
• 355: Minimum yield strength in MPa.
• NL: Normalized or normalized rolled, tested for impact toughness at -50°C.

The normalization process refines the grain structure, enhancing S355NL’s strength, toughness, and weldability, making it ideal for cold climates. Compared to en 10025 3 s355n normalized structural steel plate, S355NL offers superior low-temperature toughness (-50°C vs -20°C), while maintaining similar strength.

Chemical Composition of S355NL Steel

Gangsteel ensures S355NL meets EN 10025-3 chemical composition standards for optimal performance:

Carbon Equivalent (CEV): Capped at 0.43% for plates up to 63 mm, calculated as CEV = C + Mn/6 + (Cr + Mo + V)/5 + (Ni + Cu)/15, ensuring excellent weldability. S355NL’s lower sulfur (0.020% vs 0.025% for S355N) and phosphorus (0.025% vs 0.030%) enhance its toughness, similar to en 10025 3 s420n normalized structural steel plate.

Mechanical Properties of S355NL Steel

Gangsteel guarantees S355NL’s mechanical properties excel in high-strength, low-temperature applications:

• Yield Strength: Starts at 355 MPa for thin plates, ideal for moderate-load structures.
• Tensile Strength: 470-630 MPa ensures durability under tensile forces.
• Elongation: ≥22% supports complex structural designs.
• Impact Toughness: ≥27 J at -50°C ensures reliability in cold climates, outperforming en 10025 3 s355n normalized structural steel plate (-20°C toughness).
• Hardness: Typically 150-190 HB (Brinell), balancing machinability and durability.

Delivery Conditions and Specifications

Gangsteel provides S355NL with specifications outlined in EN 10025-3:

• Standard: EN 10025-3:2019.
• Condition: Normalized or normalized rolled for consistent microstructure.
• Thickness Range: 6–200 mm, with custom options up to 250 mm.
• Widths: 2000, 2500, or 3000 mm.
• Lengths: Up to 12,000 mm.
• Surface: Hot-rolled, with optional priming for corrosion protection.
• Certifications: EN 10204 3.1/3.2 certificates, ultrasonic testing (UT) per EN 10160, and approvals from ABS, LR, BV, or DNV.
• Z-Quality: Optional Z15, Z25, or Z35 per EN 10164 for through-thickness properties, reducing lamellar tearing risk, similar to en 10025 3 s275n normalized structural steel plate.
• Tolerances: Per EN 10029 for precision.

Welding and Heat Treatment

S355NL’s low CEV (≤0.43%) ensures excellent weldability:

• Welding: Compatible with GMAW and SAW per EN 1011-2. Preheating typically not required for plates <20 mm; optional for thicker plates (100-150°C); post-weld heat treatment (PWHT) at 550-650°C optional.
• Consumables: ER70S-6 for GMAW, EM12K flux with EH14 wire for SAW.
• Weld Quality: Enhanced by lower sulfur and phosphorus, matching en 10025 3 s355nl normalized structural steel plate for reliable joints.

Applications Leveraging S355NL Steel Properties

Gangsteel supplies S355NL for projects requiring superior low-temperature toughness:

• Offshore Platforms: Structural components in harsh marine environments, leveraging -50°C toughness.
• Wind Towers: Tower sections in cold climates, benefiting from 355 MPa yield strength.
• Bridges: Load-bearing girders in arctic or northern regions, supported by ≥22% elongation for complex designs.
• Heavy Machinery: Durable components for cold-environment equipment, relying on 470-630 MPa tensile strength.

Compared to en 10025 3 s460n normalized structural steel plate, S355NL is more cost-effective for moderate loads in colder climates.

Why Choose Gangsteel?

Gangsteel is your trusted source for S355NL:

• Inventory: Extensive stock in China for rapid delivery.
• Sizes: Thicknesses from 6–200 mm, widths up to 3000 mm, lengths up to 12,000 mm.
• Delivery: Ships globally in 7-30 days.
• Certifications: EN 10204 3.1/3.2, UT testing (EN 10160), and ABS/LR/BV/DNV approvals.
• Processing: Cutting, welding, and bending tailored to your needs.

Contact us for en 10025 3 s355nl normalized structural steel plate.

FAQ

What are S355NL steel properties?
S355NL steel properties include a yield strength of ≥355 MPa, tensile strength of 470-630 MPa, ≥22% elongation, and ≥27 J impact toughness at -50°C.

How do S355NL steel properties perform in cold climates?
S355NL’s ≥27 J impact toughness at -50°C ensures reliability for offshore platforms and wind towers in arctic environments.

Is S355NL steel weldable?
Yes, S355NL’s CEV ≤0.43% enables easy welding with GMAW or SAW, often without preheating for thinner plates, enhanced by low sulfur (0.020%).

What applications leverage S355NL steel properties?
S355NL steel properties support offshore platforms, wind towers, bridges, and heavy machinery in cold climates, leveraging high strength and toughness.

How does S355NL compare to S355N?
S355NL matches S355N’s 355 MPa yield strength but offers superior -50°C toughness vs S355N’s -20°C, ideal for colder climates.

What certifications support S355NL steel?
Gangsteel provides S355NL with EN 10204 3.1/3.2, UT testing (EN 10160), and ABS/LR/BV/DNV approvals for global compliance.

Summary

S355NL is a high-strength, low-alloy structural steel under EN 10025-3, offering a minimum yield strength of 355 MPa, tensile strength of 470-630 MPa, and exceptional -50°C toughness (≥27 J).

Its fine-grain structure, achieved through normalization, and low sulfur/phosphorus content ensure excellent weldability and durability in cold climates, making it ideal for offshore platforms, wind towers, and arctic bridges.

Gangsteel’s extensive inventory supports thicknesses from 6–200 mm, with global delivery in 7-30 days and certifications like EN 10204 3.1/3.2 and Z-quality options (Z15, Z25, Z35).

Compared to S355N, S355NL provides superior low-temperature performance, while being more cost-effective than higher-strength grades like S460N, offering a versatile solution for cold-environment structural projects.