s275n equivalent steel

S275N Equivalent Steel Grades

As a premier exporter and manufacturer of high-quality structural steel plates, Gangsteel specializes in producing EN 10025-3 compliant materials, including the versatile S275N steel grade.

S275N is a normalized fine-grain structural steel designed for welded constructions requiring enhanced toughness at low temperatures, down to -20°C.

Ideal for heavy-duty applications in bridges, cranes, and offshore structures, our S275N plates are delivered in normalized or normalized rolled conditions to ensure superior weldability and impact resistance.

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

What is S275N Steel?

S275N steel, designated as 1.0490 under the European standard EN 10025-3, is a weldable fine-grain structural steel. The "N" suffix indicates its suitability for normalized delivery with a minimum impact energy of 47 Joules at -20°C in the longitudinal direction, making it perfect for moderate cold climates and demanding environments. Compared to similar grades like en 10025 3 s275nl normalized structural steel plate, S275N offers reliable low-temperature performance without compromising on strength.

Gangsteel produces S275N plates in thicknesses up to 250 mm, with precise control over chemical composition to meet CEV limits for optimal weldability. Our plates are rigorously tested to comply with international standards, ensuring reliability for global projects.

Chemical Composition of S275N Steel

The chemical makeup of S275N is carefully balanced to provide excellent strength, ductility, and resistance to brittle fracture. Below is the product analysis for nominal thicknesses ≤ 100 mm, with a maximum Carbon Equivalent Value (CEV) of 0.40 (or up to 0.42 in some specifications).

*Note: For long products, P and S may be 0.005% higher. If N-binding elements are present, the Al minimum does not apply. Cu above 0.35% may affect hot forming.

This low carbon and controlled alloying ensure minimal risk of cracking during welding.

Mechanical Properties of S275N Steel

S275N exhibits robust mechanical characteristics, with properties varying by thickness to accommodate diverse fabrication needs. All values are for normalized (+N) condition. The table below consolidates yield strength, tensile strength, elongation, and Charpy V-Notch impact energy (longitudinal and transverse at key temperatures, with focus on -20°C minimums).

*Notes: Elongation based on Lo = 5.65 √So. Impact values are minimums; higher at warmer temperatures. These properties position S275N as a cost-effective choice for structures needing high toughness, outperforming standard S275JR in sub-zero conditions.

Heat Treatment Guide for S275N Steel Plate

S275N steel plate is primarily supplied in the normalized (+N) or normalized rolled condition as per EN 10025-3, which refines the grain structure for improved toughness and weldability.

Normalization Process

• Heating Temperature: Austenitize at 880–920°C (uniform throughout the thickness).
• Soaking Time: Hold for approximately 1 hour per 25 mm of thickness, minimum 30 minutes.
• Cooling: Air cool to room temperature at a controlled rate to avoid excessive hardening.
• Purpose: Refines ferrite-pearlite structure, enhances ductility, and ensures compliance with mechanical properties post-delivery.

If post-delivery heat treatment is needed (e.g., after hot forming), re-normalize to maintain properties. Avoid quenching unless specified, as it may alter toughness.

Welding Heat Treatment Guidelines

• Preheating: Not required for thicknesses ≤ 40 mm; recommend 50–100°C for thicker sections to prevent cold cracking, based on CEV ≤ 0.40.
• Interpass Temperature: Maximum 200°C to preserve fine grain.
• Post-Weld Heat Treatment (PWHT): Optional stress-relief at 550–650°C for 1 hour per 25 mm thickness, followed by slow cooling. Not typically needed due to low hardenability.
• Hot Forming: Perform above 850°C; re-normalize if forming temperature drops below 720°C.

Always consult EN 1011-2 for welding recommendations. Gangsteel provides plates optimized for these processes to minimize heat treatment needs.

Applications of EN 10025-3 S275N Steel Plate

EN 10025-3 S275N steel plate is widely used in:

• Heavy Engineering: Cranes, earthmoving equipment, and load-bearing frameworks.
• Infrastructure: Bridges, viaducts, and offshore platforms where low-temperature ductility is critical.
• Construction: Welded structures in shipbuilding and pressure vessels.

For higher strength needs, consider upgrading to en 10025 3 s355n normalized structural steel plate or en 10025 3 s355nl normalized structural steel plate.

Equivalent Grades to EN 10025-3 S275N Steel Plate

Why Choose Gangsteel for EN 10025-3 S275N Steel Plate?

With state-of-the-art mills and a commitment to ISO-certified quality, Gangsteel delivers S275N plates tailored to your specifications. Stocked in various sizes and ready for immediate export worldwide. For detailed pricing and availability, visit our en 10025 3 s275n normalized structural steel plate product page or contact our sales team today.

Summary

EN10025-3 S275N steel plate is a weldable normalized fine-grain structural steel with 275 MPa yield, 370–530 MPa tensile, and 47 J impact at -20°C. Its controlled chemistry (CEV ≤ 0.40) and fine-grain structure make it ideal for welded structures in moderate cold environments like bridges and offshore platforms. S275N from Gangsteel ensures reliability for global projects.

FAQ

What is the difference between S275N and S275NL steel plate?

S275N provides impact testing down to -20°C (47 J longitudinal), while S275NL extends this to -50°C (27 J longitudinal). Both are normalized fine-grain steels under EN 10025-3, but S275NL is ideal for arctic or sub-zero conditions.

What are the maximum thicknesses available for S275N plates?

Gangsteel supplies S275N plates up to 250 mm thick, with mechanical properties adjusted for thicker sections to maintain structural integrity.

Is S275N suitable for welding without preheating?

Yes, due to its low CEV (max 0.40), S275N exhibits excellent weldability. Preheating is typically not required for thicknesses under 40 mm, but consult project specifications for optimal procedures.

What certifications does Gangsteel provide with S275N plates?

All plates come with EN 10204 3.1 mill certificates, including chemical analysis, mechanical test results, and impact testing. We also offer third-party inspections like Lloyd's Register or DNV upon request.

Can S275N be used in offshore structures?

Absolutely—its high toughness at -20°C and corrosion resistance (with proper coatings) make it a preferred material for offshore platforms, as per EN 10025-3 standards.