bs en 10025-3 material grade

BS EN 10025-3 Material Grades

BS EN 10025-3 is a European standard specifying technical delivery conditions for normalized/normalized rolled weldable fine grain structural steels. These steels are designed for high strength, excellent toughness, and weldability, making them ideal for demanding structural applications like bridges, offshore platforms, and wind towers, especially in low-temperature environments. This article outlines the material grades covered under BS EN 10025-3, their properties, and applications, with insights into their use and supply from Gangsteel. For more details, explore our EN 10025-3 normalized steel plates.

Overview of BS EN 10025-3

BS EN 10025-3 defines fine grain structural steels in normalized or normalized rolled conditions, ensuring refined microstructures for enhanced toughness and weldability. The standard includes grades with varying strength and toughness levels, denoted by:

• S: Structural steel.
• Number (e.g., 275, 355): Minimum yield strength in MPa for thicknesses ≤16 mm.
• N/NL: N for normalized with -20°C impact testing; NL for normalized with -50°C impact testing for low-temperature performance.

BS EN 10025-3 Material Grades

The standard covers eight primary grades, divided into N and NL categories based on impact toughness testing temperatures:

• N Grades (S275N, S355N, S420N, S460N): Tested at -20°C, suitable for moderate climates.
• NL Grades (S275NL, S355NL, S420NL, S460NL): Tested at -50°C, ideal for sub-zero environments.

For specific grade details, see EN 10025-3 S355NL normalized structural steel plate or EN 10025-3 S460NL normalized structural steel plate.

Chemical Composition of BS EN 10025-3 Grades

The chemical composition is tightly controlled to ensure weldability and toughness. Below is an example for S355NL (ladle analysis):

Carbon Equivalent (CEV): ≤0.43% for S355NL (≤63 mm), calculated as CEV = C + Mn/6 + (Cr + Mo + V)/5 + (Ni + Cu)/15. Higher grades like S460NL have slightly higher CEV (≤0.45%), but all remain highly weldable. For other grades like EN 10025-3 S420NL normalized structural steel plate, compositions are similarly optimized.

Mechanical Properties of BS EN 10025-3 Grades

Mechanical properties vary by grade and thickness. Below is a summary for key grades at ≤16 mm thickness:

Properties decrease slightly with thickness (up to 250 mm for S275N/NL, S355N/NL; 200 mm for S420N/NL, S460N/NL). NL grades excel in cold climates due to -50°C testing.

Equivalent Grades

BS EN 10025-3 grades have equivalents in other standards:

For example, explore EN 10025-3 S275N normalized structural steel plate.

Welding and Heat Treatment

All BS EN 10025-3 grades are weldable due to low CEV (e.g., ≤0.43% for S355NL, ≤0.45% for S460NL):

• Welding: Use GMAW or SAW with fillers like ER70S-6 (GMAW) or EM12K flux with EH14 wire (SAW). Preheating (100-150°C) is advised for >20 mm thicknesses.
• PWHT: Optional at 550-650°C for critical welds; rarely needed.

Applications of BS EN 10025-3 Grades

• S275N/NL: General buildings, pipelines in cold regions (NL).
• S355N/NL: Bridges, wind towers, offshore platforms (NL for arctic use).
• S420N/NL: Heavy machinery, high-load structures, cold-climate cranes (NL).
• S460N/NL: High-strength frameworks, arctic offshore platforms (NL).

See EN 10025-3 S355N normalized structural steel plate for temperate applications.

Why Choose Gangsteel for BS EN 10025-3 Grades?

Gangsteel offers all BS EN 10025-3 grades:

• Inventory: Extensive stock in China for S275N/NL, S355N/NL, S420N/NL, S460N/NL.
• 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.

Contact us for EN 10025-3 S420N normalized structural steel plate.

FAQ

What are the BS EN 10025-3 grades?S275N, S275NL, S355N, S355NL, S420N, S420NL, S460N, S460NL.

What’s the difference between N and NL grades?N grades are tested at -20°C; NL grades at -50°C for colder environments.

Are BS EN 10025-3 grades weldable?Yes; low CEV (e.g., ≤0.43% for S355NL) ensures easy welding with minimal preheating.

What are typical applications?Bridges, offshore platforms, wind towers, machinery; NL grades for sub-zero climates.

What is the ASTM equivalent for S355NL?A572 Grade 65 or A633 Grade E (better for low-temp toughness).

What is the maximum thickness?250 mm for S275N/NL, S355N/NL; 200 mm for S420N/NL, S460N/NL.

Why buy from Gangsteel?Reliable stock, fast delivery, certified quality, and processing services.

Explore EN 10025-3 S275NL normalized structural steel plate for low-temperature needs.