S355N Steel Applications Guide

S355N Steel Applications Guide

At Gangsteel, we’re excited to present a comprehensive guide to S355N steel applications, highlighting the versatility 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 projects in moderate climates, including bridges, cranes, building frameworks, and heavy machinery.

As part of the en 10025 3 normalized steel plate family, S355N delivers reliable performance across a range of demanding applications. Gangsteel explores its key applications, supported by its chemical composition and mechanical properties, and compares 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’s 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.

Chemical Composition Supporting S355N Applications

Gangsteel ensures S355N meets EN 10025-3 chemical composition standards, enabling its diverse applications:

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 weldability for structural applications, similar to en 10025 3 s420n normalized structural steel plate.

Mechanical Properties Supporting S355N Applications

Gangsteel guarantees S355N’s mechanical properties enable its wide-ranging applications:

• Yield Strength: Starts at 355 MPa, ideal for load-bearing structures like bridge girders.
• Tensile Strength: 470-630 MPa ensures durability in high-stress applications like cranes.
• Elongation: ≥22% supports complex structural designs, such as building frameworks.
• 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), aiding precise weight calculations for structural design.

Delivery Conditions and Specifications

Gangsteel provides S355N with specifications optimized for its applications:

• 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 in welded structures, similar to en 10025 3 s275n normalized structural steel plate.
• Tolerances: Per EN 10029 for precision.

Welding and Heat Treatment

S355N’s properties support weldability for structural applications:

• 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.

Key S355N Steel Applications

S355N’s mechanical properties and chemical composition make it ideal for:

• Bridges: Load-bearing girders and beams in moderate climates, leveraging 355 MPa yield strength and corrosion resistance from copper/chromium for longevity. Used in projects like highway overpasses and pedestrian bridges across Europe.
• Cranes: Structural components like booms and frames, benefiting from 470-630 MPa tensile strength and -20°C toughness for reliable operation in temperate regions.
• Building Frameworks: Columns, trusses, and beams in commercial and industrial buildings, supported by ≥22% elongation for complex designs and weldability for robust connections.
• Heavy Machinery: Chassis and structural parts in industrial equipment, relying on fine-grain structure and toughness for durability under dynamic loads.

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

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 the key S355N steel applications?
S355N steel applications include bridges, cranes, building frameworks, and heavy machinery in moderate climates, leveraging its 355 MPa yield strength and -20°C toughness.

How does S355N’s toughness support its applications?
S355N’s ≥27 J impact toughness at -20°C ensures reliability in moderate-climate structural projects like bridges and cranes.

Is S355N weldable for its applications?
Yes, S355N’s CEV ≤0.43% and low impurities enable reliable welding for structural components using GMAW or SAW.

How does S355N compare to S460N for applications?
S355N’s 355 MPa yield strength is lower than S460N’s 460 MPa, but its higher elongation (≥22% vs ≥17%) makes it more cost-effective for moderate loads.

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

Why is S355N suitable for bridges and cranes?
S355N’s fine-grain structure, high strength, and weldability make it ideal for load-bearing and durable structural components in moderate climates.

Summary

S355N is a high-strength, low-alloy structural steel under EN 10025-3, ideal for applications in moderate climates due to its 355 MPa yield strength, 470-630 MPa tensile strength, and ≥27 J toughness at -20°C.

Its fine-grain structure and low CEV (≤0.43%) enable robust applications in bridges, cranes, building frameworks, and heavy machinery, ensuring strength, durability, and weldability.

Gangsteel’s 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 offers a cost-effective balance of strength and ductility, making it a versatile choice for general structural projects in temperate regions.