S355N Yield Strength Specifications

S355N Yield Strength Specifications

At Gangsteel, we’re thrilled to provide a detailed overview of the S355N yield strength specifications, a defining feature of this high-strength, low-alloy structural steel under EN 10025-3. Renowned for its fine-grain structure, 355 MPa minimum 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 explores its yield strength, chemical composition, mechanical properties, 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 yield strength specifications, 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 Yield Strength Specifications

S355N’s yield strength varies by plate thickness, as specified in EN 10025-3:

• Yield Strength Range: Starts at 355 MPa for plates ≤16 mm, decreasing to 285 MPa for thicker plates (150–200 mm) due to rolling limitations.
• Applications: The high yield strength supports moderate-load structures like bridge girders and crane components.
• Comparison: Compared to en 10025 3 s420n normalized structural steel plate (420 MPa) and S460N (460 MPa), S355N’s yield strength is lower but sufficient for many structural designs, offering cost efficiency.

The fine-grain structure, achieved through normalization, ensures consistent yield strength across thicknesses, enhancing structural reliability.

Chemical Composition Supporting S355N Yield Strength

Gangsteel ensures S355N meets EN 10025-3 chemical composition standards, with elements driving its yield strength:

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. Manganese (0.90-1.65%), niobium (0.05%), and vanadium (0.10%) are key to achieving S355N’s yield strength, similar to en 10025 3 s355nl normalized structural steel plate.

Mechanical Properties Supporting S355N Yield Strength

Gangsteel guarantees S355N’s mechanical properties complement its yield strength:

• Yield Strength: Driven by manganese, niobium, and vanadium, ensuring structural reliability.
• Tensile Strength: 470-630 MPa, supported by carbon and molybdenum, provides durability.
• Elongation: ≥22%, enhanced by low sulfur/phosphorus, supports complex designs.
• Impact Toughness: ≥27 J at -20°C, bolstered by nickel and fine-grain structure, ensures performance in moderate climates.
• Hardness: Typically 150-190 HB (Brinell), balancing machinability and durability.

These properties align with S355N’s yield strength for robust structural applications.

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, custom 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, ultrasonic testing (UT) per EN 10160, ABS/LR/BV/DNV approvals.
• Z-Quality: Optional Z15, Z25, or Z35 per EN 10164 for through-thickness properties, similar to en 10025 3 s275n normalized structural steel plate.
• Tolerances: Per EN 10029 for precision.

Welding and Heat Treatment

S355N’s yield strength is supported by its weldability:

• Welding: Compatible with GMAW and SAW per EN 1011-2. Preheating typically not required for <20 mm; optional for thicker plates (100-150°C); PWHT at 550-650°C optional.
• Consumables: ER70S-6 (GMAW), EM12K flux with EH14 wire (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 Yield Strength

Gangsteel supplies S355N for projects relying on its yield strength:

• Bridges: Girders and beams in moderate climates, leveraging 355 MPa yield strength.
• Cranes: Structural components, benefiting from high tensile strength.
• Building Frameworks: Columns and trusses, supported by ≥22% elongation.
• Heavy Machinery: Chassis components, relying on -20°C toughness.

For colder climates, consider en 10025 3 s355nl normalized structural steel plate.

Why Choose Gangsteel?

Gangsteel is your trusted source for S355N:

• Inventory: Extensive stock in China.
• Sizes: Thicknesses 6–200 mm, widths up to 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 s355n normalized structural steel plate.

FAQ

What are S355N yield strength specifications?
S355N yield strength specifications include ≥355 MPa for plates ≤16 mm, decreasing to 285 MPa for 150–200 mm, per EN 10025-3.

How does S355N yield strength perform in structures?
S355N’s ≥355 MPa yield strength supports moderate-load structures like bridges and cranes in temperate climates.

What supports S355N’s yield strength?
Manganese (0.90-1.65%), niobium (0.05%), and vanadium (0.10%) drive S355N’s yield strength, ensuring structural reliability.

What applications leverage S355N yield strength?
S355N’s yield strength supports bridges, cranes, and frameworks in moderate climates, leveraging 355 MPa for load-bearing.

How does S355N yield strength compare to S460N?
S355N’s 355 MPa yield strength is lower than S460N’s 460 MPa, but offers better ductility (≥22% vs ≥17%) for cost-effective designs.

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

Summary

S355N’s yield strength specifications, starting at 355 MPa for plates ≤16 mm, make it a high-strength, low-alloy structural steel ideal for moderate climates.

Its fine-grain structure, driven by manganese, niobium, and vanadium, supports reliable performance in bridges, cranes, building frameworks, and heavy machinery.

Gangsteel’s inventory offers S355N in thicknesses from 6–200 mm, with global delivery in 7-30 days and certifications like EN 10204 3.1/3.2.

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