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At Gangsteel, we’re proud to provide a detailed breakdown of the S355N chemical composition, a key factor in the performance 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 strength and weldability. Gangsteel explores its 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.
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:
The normalization process refines the grain structure, optimizing the S355N chemical composition for strength, toughness, and weldability, 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.
Gangsteel ensures S355N meets EN 10025-3 chemical composition standards, with each element contributing to its performance:
|
Element |
Ladle Analysis (max %) |
Product Analysis (max %) |
Role in S355N Chemical Composition |
|---|---|---|---|
|
Carbon (C) |
0.20 |
0.22 |
Enhances strength but kept low to ensure weldability and toughness, preventing brittleness in welds. |
|
Silicon (Si) |
0.50 |
0.55 |
Aids deoxidation, improves strength, and enhances microstructure stability for consistent performance. |
|
Manganese (Mn) |
0.90-1.65 |
0.85-1.75 |
Boosts strength and toughness, critical for load-bearing capacity in structural applications. |
|
Phosphorus (P) |
0.030 |
0.035 |
Minimized to reduce inclusions, improving toughness and weld quality for heavy structures. |
|
Sulfur (S) |
0.025 |
0.030 |
Low levels prevent inclusions, ensuring clean welds and high ductility in thick plates. |
|
Nitrogen (N) |
0.025 |
0.027 |
Controlled to avoid brittleness, supporting toughness and structural integrity. |
|
Aluminum (Al) |
0.020 (min, total) |
0.015 (min, total) |
Refines grain structure, enhancing toughness and improving weldability for critical applications. |
|
Niobium (Nb) |
0.05 |
0.06 |
Promotes fine-grain structure, increasing strength and toughness for demanding environments. |
|
Vanadium (V) |
0.10 |
0.12 |
Enhances strength through precipitation hardening, supporting load-bearing capacity. |
|
Titanium (Ti) |
0.05 |
0.06 |
Refines grains, contributing to toughness and fine microstructure for structural reliability. |
|
Chromium (Cr) |
0.30 |
0.35 |
Enhances corrosion resistance and strength, improving durability in structural applications. |
|
Nickel (Ni) |
0.50 |
0.55 |
Improves toughness, particularly at -20°C, ensuring performance in moderate climates. |
|
Molybdenum (Mo) |
0.10 |
0.12 |
Boosts strength and creep resistance, enhancing performance under sustained loads. |
|
Copper (Cu) |
0.55 |
0.60 |
Enhances corrosion resistance, supporting longevity in outdoor structures. |
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 low-alloy composition, with microalloying elements like niobium and vanadium, supports S355N’s fine-grain structure, similar to en 10025 3 s420n normalized structural steel plate.
Gangsteel guarantees S355N’s mechanical properties align with its chemical composition:
|
Thickness (mm) |
Yield Strength (min, MPa) |
Tensile Strength (MPa) |
Elongation (min, %) |
Impact Energy (min, J @ -20°C) |
|---|---|---|---|---|
|
≤16 |
355 |
470-630 |
22 |
27 |
|
16<t≤40 |
345 |
470-630 |
22 |
27 |
|
40<t≤63 |
335 |
470-630 |
22 |
27 |
|
63<t≤80 |
325 |
470-630 |
22 |
27 |
|
80<t≤100 |
315 |
470-630 |
22 |
27 |
|
100<t≤150 |
295 |
450-610 |
22 |
27 |
|
150<t≤200 |
285 |
450-610 |
22 |
27 |
Gangsteel provides S355N with specifications outlined in EN 10025-3:
S355N’s chemical composition supports excellent weldability:
Gangsteel supplies S355N for projects relying on its composition-driven properties:
For colder climates, consider en 10025 3 s355nl normalized structural steel plate.
Gangsteel is your trusted source for S355N:
Contact us for en 10025 3 s355n normalized structural steel plate.
What is the S355N chemical composition?
S355N chemical composition includes 0.20% max carbon, 0.90-1.65% manganese, 0.05% niobium, and low sulfur/phosphorus (0.025%/0.030%) for strength and weldability.
How does S355N chemical composition support toughness?
Low sulfur (0.025%), phosphorus (0.030%), and microalloying (Nb, V, Al) ensure fine-grain structure and ≥27 J toughness at -20°C.
Is S355N weldable based on its chemical composition?
Yes, S355N’s CEV ≤0.43% and low impurities enable easy welding with GMAW/SAW, often without preheating for thinner plates.
What applications leverage S355N chemical composition?
S355N’s composition supports bridges, cranes, and frameworks in moderate climates, leveraging manganese and niobium for strength.
How does S355N compare to S460N?
S355N’s composition yields lower strength (355 MPa vs 460 MPa) but higher elongation (≥22% vs ≥17%) than S460N, for cost-effective applications.
What certifications support S355N?
Gangsteel provides S355N with EN 10204 3.1/3.2, UT testing (EN 10160), and ABS/LR/BV/DNV approvals.
S355N’s chemical composition, with low carbon (0.20% max), manganese (0.90-1.65%), and microalloying elements like niobium and vanadium, ensures a fine-grain structure for high strength and toughness.
This composition supports a yield strength of 355 MPa, tensile strength of 470-630 MPa, and ≥27 J toughness at -20°C, ideal for bridges, cranes, and frameworks in moderate climates.
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 composition provides a cost-effective balance of strength and ductility, making it a versatile choice for structural projects in temperate regions.
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