bs en 10025 s275nl specification

BS EN 10025 S275NL Specification

As a leading exporter and manufacturer of high-quality structural steel plates, Gangsteel specializes in producing BS EN 10025-3 compliant materials, including the S275NL steel grade.

S275NL is a normalized fine-grain structural steel designed for welded constructions, offering excellent toughness at low temperatures down to -50°C.

It is ideal for demanding applications such as bridges, offshore structures, and cranes.

Our S275NL plates are supplied in normalized or normalized rolled conditions, ensuring superior weldability and impact resistance.

For a comprehensive overview of our en 10025 3 normalized steel plate offerings, explore our full range.

Overview of BS EN 10025-3 S275NL

S275NL (BS EN 10025-3, designation 1.0491) is a low-alloy, fine-grain structural steel under the European standard EN 10025-3, adopted by the British Standards Institution (BSI). The designation breaks down as follows: "S" for structural steel, "275" for a minimum yield strength of 275 MPa (for ≤16 mm thickness), and "NL" indicating normalized delivery with a minimum Charpy V-notch impact energy of 27 Joules at -50°C (longitudinal). This distinguishes it from en 10025 3 s275n normalized structural steel plate, which is tested at -20°C, and makes S275NL suitable for extreme cold environments.

Gangsteel supplies S275NL in thicknesses up to 250 mm, with controlled chemistry and rigorous testing (ultrasonic, impact) to meet BS EN 10025-3 requirements.

Chemical Composition of S275NL

The chemical composition is optimized for weldability, strength, and low-temperature toughness (ladle analysis, max % unless noted, ≤100 mm thickness).

*Note: Low P and S levels enhance toughness; CEV ≤0.42 ensures minimal weld cracking. For long products, P and S may be 0.005% higher.

Mechanical Properties of S275NL

Properties are specified for normalized (+N) condition, varying by thickness (minimum values).

*Notes: Elongation per Lo = 5.65 √So. Impact values increase at higher temperatures (e.g., 63 J longitudinal at +20°C).

Weldability and Processing

S275NL is highly weldable due to its low CEV (≤0.42):

• Preheating: Not required for thicknesses ≤40 mm; 50–100°C recommended for thicker sections to prevent cold cracking.
• Interpass Temperature: Maximum 200°C to preserve fine-grain structure.
• Post-Weld Heat Treatment (PWHT): Optional stress relief at 550–650°C (1 hour per 25 mm thickness); rarely needed due to low hardenability.
• Welding Processes: Suitable for SMAW, GMAW, GTAW; use low-hydrogen fillers (e.g., E7018) per EN 1011-2.
• Forming: Hot forming above 850°C; re-normalize if below 720°C to maintain properties.

Applications

S275NL is used in:

• Infrastructure: Bridges and viaducts in cold climates.
• Heavy Engineering: Cranes, excavators, and load-bearing frames.
• Offshore and Marine: Platforms and ship structures requiring -50°C toughness.
• Construction: Welded pressure vessels and buildings in arctic regions.

For higher strength needs, consider en 10025 3 s355nl normalized structural steel plate or en 10025 3 s420nl normalized structural steel plate.

Accessing BS EN 10025-3 PDF

The BS EN 10025-3 standard, detailing S275NL specifications, is a copyrighted document published by the British Standards Institution (BSI) and CEN. To obtain the official PDF:

1. Purchase from BSI: Visit shop.bsigroup.com and search for “BS EN 10025-3:2019” (latest edition). Prices are approximately £200–£300, depending on format and membership.
2. Standards Organizations: Access via CEN (cen.eu) or national bodies with licensing.
3. Libraries/Institutions: Engineering libraries or universities may provide access for members.
4. Gangsteel Support: We cannot distribute the PDF due to copyright but can provide technical summaries or mill certificates (EN 10204 3.1) detailing S275NL properties. Contact admin@gangsteel.com.

*Note: Avoid unofficial sources for PDFs, as they may be outdated or infringe copyright.

Why Choose Gangsteel?

Gangsteel delivers ISO-certified S275NL plates in custom sizes, with global export readiness. Visit our en 10025 3 s275nl normalized structural steel plate page for details and pricing.

Summary

BS EN 10025-3 S275NL is a normalized fine-grain structural steel with a 275 MPa yield strength, 370–510 MPa tensile strength, 23–24% elongation, and 27 J impact energy at -50°C. Its low-carbon chemistry and fine-grain structure ensure excellent weldability and toughness for cold-environment applications like bridges and offshore platforms.

FAQ

What does S275NL stand for in BS EN 10025-3?

“S” denotes structural steel, “275” indicates 275 MPa minimum yield strength, and “NL” means normalized with impact testing at -50°C (27 J longitudinal).

How does S275NL differ from S275N?

S275NL is impact tested at -50°C (27 J), while S275N is tested at -20°C (47 J), making S275NL better for extreme cold environments.

Is S275NL weldable without preheating?

Yes, for thicknesses ≤40 mm due to CEV ≤0.42; thicker sections may need 50–100°C preheat per EN 1011-2.

What are the equivalent grades for S275NL?

Equivalents include ASTM A633 Gr. A, DIN TStE 285, JIS SM490B (normalized), and GB Q275N.

How can I access the BS EN 10025-3 PDF for S275NL?

Purchase from BSI or CEN for ~£200–£300; contact Gangsteel for technical summaries or certifications.