S355N Mechanical Properties Overview

S355N Mechanical Properties Overview

At Gangsteel, we’re delighted to present a comprehensive overview of S355N mechanical properties, highlighting the capabilities of this high-strength, low-alloy structural steel under EN 10025-3. Renowned for its fine-grain structure, 355 MPa yield strength, and -20°C toughness, S355N is a top choice for structural applications like bridges, cranes, and building frameworks in moderate climates.

As part of the en 10025 3 normalized steel plate family, S355N delivers reliable performance. Gangsteel details its mechanical properties, chemical composition, delivery conditions, and applications, comparing it to grades like en 10025 3 s420n normalized structural steel plate and en 10025 3 s460n normalized structural steel plate. For more details, contact us or visit our en 10025 3 s355n normalized structural steel plate page.

What is S355N Steel?

S355N 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 1.0545, breaks down as:

• S: Structural steel.
• 355: Minimum yield strength in MPa.
• N: Normalized or normalized rolled, tested for impact toughness at -20°C.

The normalization process refines the grain structure, enhancing S355N mechanical properties for strength, toughness, and weldability, making it ideal for moderate climates. Compared to en 10025 3 s460n normalized structural steel plate, S355N offers lower strength (355 MPa vs 460 MPa) but is more cost-effective for general structural applications.

S355N Mechanical Properties

Gangsteel guarantees S355N’s mechanical properties meet high-strength application needs:

• Yield Strength: Starts at 355 MPa for plates ≤16 mm, decreasing to 285 MPa for thicker plates (150–200 mm), ideal for moderate-load structures like bridges.
• Tensile Strength: 470-630 MPa ensures durability under high tensile forces, supporting robust designs.
• Elongation: ≥22% allows for complex structural shapes, providing excellent formability.
• Impact Toughness: ≥27 J at -20°C ensures reliability in moderate climates, comparable to en 10025 3 s355nl normalized structural steel plate.
• Hardness: Typically 150-190 HB (Brinell), balancing machinability and durability.
• Density: 7.85 g/cm³ (7850 kg/m³), standard for structural steels, aiding weight calculations.

These properties make S355N versatile for structural applications requiring strength and ductility.

Chemical Composition Supporting S355N Mechanical Properties

Gangsteel ensures S355N meets EN 10025-3 chemical composition standards, driving its mechanical 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. The microalloying elements (Nb, V, Al) and low impurities drive S355N’s mechanical properties, similar to en 10025 3 s420n normalized structural steel plate.

Delivery Conditions and Specifications

Gangsteel provides S355N 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

S355N’s mechanical properties support 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: Low sulfur (0.025%) and phosphorus (0.030%) ensure reliable welds, matching en 10025 3 s355n normalized structural steel plate.

Applications Leveraging S355N Mechanical Properties

Gangsteel supplies S355N for projects that rely on its mechanical properties:

• Bridges: Load-bearing girders and beams in moderate climates, leveraging 355 MPa yield strength.
• Cranes: Structural components for lifting equipment, benefiting from 470-630 MPa tensile strength.
• Building Frameworks: Columns and trusses in temperate regions, supported by ≥22% elongation for complex designs.
• Heavy Machinery: Durable chassis components, relying on -20°C toughness.

For colder climates requiring -50°C toughness, consider en 10025 3 s355nl normalized structural steel plate.

Why Choose Gangsteel?

Gangsteel is your trusted source for S355N:

• 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 project needs.

Contact us for en 10025 3 s355n normalized structural steel plate.

FAQ

What are S355N mechanical properties?
S355N mechanical properties include a yield strength of ≥355 MPa, tensile strength of 470-630 MPa, ≥22% elongation, and ≥27 J impact toughness at -20°C.

How do S355N mechanical properties perform in moderate climates?
S355N’s ≥27 J impact toughness at -20°C ensures reliability for bridges and cranes in temperate environments.

Are S355N mechanical properties weldable?
Yes, S355N’s CEV ≤0.43% enables easy welding with GMAW or SAW, often without preheating for thinner plates.

What applications leverage S355N mechanical properties?
S355N mechanical properties support bridges, cranes, building frameworks, and heavy machinery in moderate climates, leveraging high strength and ductility.

How do S355N mechanical properties compare to S460N?
S355N has lower yield strength (355 MPa vs 460 MPa) than S460N but offers higher elongation (≥22% vs ≥17%) for better formability.

What certifications support S355N mechanical properties?
Gangsteel provides S355N with EN 10204 3.1/3.2, UT testing (EN 10160), and ABS/LR/BV/DNV approvals for global compliance.

Summary

S355N’s mechanical properties, including a minimum yield strength of 355 MPa, tensile strength of 470-630 MPa, ≥22% elongation, and ≥27 J toughness at -20°C, make it a robust choice for structural applications under EN 10025-3.

Its fine-grain structure, achieved through normalization, ensures excellent strength, toughness, and weldability for bridges, cranes, and building frameworks in moderate climates.

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 optional Z-quality (Z15, Z25, Z35).

Compared to S460N, S355N’s lower strength and higher ductility provide a cost-effective solution for general structural projects in temperate regions.