EN 10025-3 S355NL Steel Key Features

 

EN 10025-3 S355NL Steel: Key Features

EN 10025-3 S355NL is a high-strength, low-alloy structural steel grade specified under the European standard EN 10025-3, which outlines technical delivery conditions for normalized or normalized rolled weldable fine grain structural steels.

Renowned for its superior strength, exceptional low-temperature toughness, and excellent weldability, EN 10025 S355NL is a preferred choice for demanding structural applications such as bridges, offshore platforms, and wind turbine towers.

 This article explores the key features of EN10025 S355NL, including its chemical composition, mechanical properties, welding characteristics, and applications, addressing core keywords like en 10025 3 s355nl, en 10025 s355nl, en10025 s355nl, and s355nl en 10025 3. For more details, visit our EN 10025-3 S355NL normalized structural steel plate.

 

What is EN 10025-3 S355NL Steel?

EN 10025-3 S355NL is a fine grain structural steel designed for enhanced toughness and weldability. The designation breaks down as:

• S: Structural steel, indicating its use in load-bearing structures.
• 355: Minimum yield strength of 355 MPa for plates up to 16 mm thick.
• NL: Normalized or normalized rolled, with impact toughness tested at -50°C for low-temperature performance.

As a fine grain steel, S355NL EN 10025-3 is processed to achieve a refined microstructure, ensuring resistance to brittle fracture and suitability for cold climates.

 

Key Feature 1: Chemical Composition of EN 10025-3 S355NL

The chemical composition of EN10025 S355NL is optimized for strength, toughness, and weldability, with low carbon and alloy content to minimize welding challenges. Below is the composition (ladle and product analysis) per EN 10025-3:

Element	Ladle Analysis (max %)	Product Analysis (max %)
Carbon (C)	0.18	0.20
Silicon (Si)	0.50	0.55
Manganese (Mn)	0.90-1.65	0.85-1.75
Phosphorus (P)	0.025	0.035
Sulfur (S)	0.015	0.025
Nitrogen (N)	0.015	0.017
Aluminum (Al)	0.020 (min, total)	0.015 (min, total)
Niobium (Nb)	0.05	0.06
Vanadium (V)	0.12	0.15
Titanium (Ti)	0.05	0.06
Chromium (Cr)	0.30	0.35
Nickel (Ni)	0.30	0.35
Molybdenum (Mo)	0.10	0.13
Copper (Cu)	0.55	0.60

The Carbon Equivalent (CEV), calculated as CEV = C + Mn/6 + (Cr + Mo + V)/5 + (Ni + Cu)/15, is ≤0.43% for thicknesses ≤63 mm, ensuring excellent weldability for EN 10025 S355NL.

 

Key Feature 2: Mechanical Properties of S355NL

EN 10025-3 S355NL combines high strength with low-temperature toughness, making it ideal for demanding applications. Key mechanical properties include:

• Yield Strength: ≥355 MPa (≤16 mm).
• Tensile Strength: 470-630 MPa.
• Elongation: ≥22% (≤63 mm).
• Impact Toughness: ≥27 J at -50°C (Charpy V-notch, longitudinal).

Properties vary by thickness:

Thickness (mm)	Yield Strength (min, MPa)	Tensile Strength (MPa)	Elongation (min, %)	Impact Energy (min, J @ -50°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	21	27
80<t≤100	305	470-630	21	27
100<t≤150	285	450-610	21	27
150<t≤200	265	450-610	21	27
200<t≤250	245	450-610	21	27

This makes S355NL EN 10025-3 suitable for high-stress, cold-environment structures.

 

Key Feature 3: Superior Weldability

The low CEV (≤0.43%) of EN10025 S355NL ensures excellent weldability using GMAW or SAW, per EN 1011-2 guidelines:

• Preheating: Not required for ≤20 mm; 100-150°C for thicker plates to prevent hydrogen cracking.
• Post-Weld Heat Treatment (PWHT): Optional at 550-650°C for critical welds; rarely needed.
• Consumables: ER70S-6 (GMAW), EM12K flux with EH14 wire (SAW).

This weldability supports efficient fabrication of complex structures.

 

Key Feature 4: Low-Temperature Performance

The EN 10025 S355NL grade excels in cold climates, with guaranteed impact toughness of ≥27 J at -50°C, making it ideal for arctic or sub-zero applications like offshore platforms and northern bridges.

 

Applications of EN 10025-3 S355NL

EN 10025-3 S355NL is used in:

• Offshore Platforms: Fatigue-resistant in icy marine environments.
• Wind Turbine Towers: Supports heavy loads in cold climates.
• Bridges and Cranes: Load-bearing components in northern regions.
• Pressure Vessels: Low-temperature storage systems.

Its high strength-to-weight ratio, -50°C toughness, and weldability align with Eurocode 3 standards. Explore related grades like EN 10025-3 S420NL normalized structural steel plate.

 

Equivalent Grades

Standard	Equivalent Grade	Notes
EN 10025-4	S355M	Thermomechanically rolled, finer grains.
EN 10025-3	S355N	Tested at -20°C, less suited for extreme cold.
DIN	StE 355 / TStE 355	Similar strength and toughness.
GB (China)	Q345E	-40°C toughness, slight composition variance.
ASTM/ASME	A572 Grade 65 (approximate)	Higher yield (~450 MPa), less -50°C focus.

See EN 10025-3 S355N normalized structural steel plate.

 

Why Choose Gangsteel for S355NL?

Gangsteel offers S355NL EN 10025-3:

• Inventory: Extensive stock in China.
• Sizes: Thickness 6–250 mm, widths 2000/2500/3000 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.

Request a quote for EN 10025-3 S355NL normalized structural steel plate.

 

FAQ

What is EN 10025-3 S355NL?
A high-strength, fine-grained structural steel with 355 MPa yield and -50°C toughness.

What are the key features of EN 10025 S355NL?
High strength, -50°C toughness, excellent weldability, and fine grain structure.

Is EN10025 S355NL weldable?
Yes; CEV ≤0.43% supports GMAW/SAW with minimal preheating.

What are applications of S355NL EN 10025-3?
Offshore platforms, wind towers, bridges, and pressure vessels in cold climates.

How does EN 10025-3 S355NL compare to S355J2?
S355NL is normalized, tested at -50°C; S355J2 is hot-rolled, tested at -20°C.

What is the ASTM equivalent?
A572 Grade 65 or A633 Grade E (better for toughness). See EN 10025-3 S275N normalized structural steel plate.