Does s420n steel conform to EN 10025?

Does S420N Steel Conform to EN 10025?

As a premier exporter and manufacturer of high-quality structural steel plates, Gangsteel specializes in producing EN 10025-3 compliant materials, including the versatile S420N steel grade.

Yes, S420N steel conforms to EN 10025, specifically Part 3 (EN 10025-3), which covers technical delivery conditions for normalized/normalized rolled weldable fine-grain structural steels. EN 10025 is a European standard for hot-rolled structural steels, divided into parts: Part 1 (general requirements), Part 2 (non-alloy steels), Part 3 (fine-grain normalized steels like S420N), and others. S420N is a high-strength low-alloy (HSLA) steel optimized for welded constructions requiring enhanced toughness at low temperatures down to -20°C, making it ideal for bridges, cranes, and offshore structures. Our S420N 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 S420N Steel?

S420N steel, designated as 1.8902 under EN 10025-3, belongs to the family of weldable fine-grain steels. The "N" suffix indicates its suitability for normalized delivery with a minimum impact energy of 40 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 s420nl normalized structural steel plate, S420N offers balanced low-temperature performance without compromising on strength.

Gangsteel produces S420N 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 S420N Steel

The chemical makeup of S420N 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 0.48 (or up to 0.50 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 0.4% may affect hot forming.

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

Mechanical Properties of S420N Steel

S420N 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 (e.g., longitudinal at 20°C: 63 J). These properties position S420N as a cost-effective choice for structures needing high toughness, outperforming standard S420JR in sub-zero conditions.

Applications of S420N Steel Plates

S420N 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 s460n normalized structural steel plate or en 10025 3 s460nl normalized structural steel plate.

Equivalent Grades to S420N

Why Choose Gangsteel for S420N Steel?

With state-of-the-art mills and a commitment to ISO-certified quality, Gangsteel delivers S420N 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 s420n normalized structural steel plate product page or contact our sales team today.

Summary

S420N steel fully conforms to EN 10025-3, a part of the EN 10025 series for hot-rolled structural steels. With a yield strength ranging from 340–420 MPa, controlled chemical composition, and superior impact resistance down to -20°C, S420N from Gangsteel ensures durability in bridges, cranes, and offshore projects. Explore our range for customized solutions and competitive global supply.

FAQ

What is the difference between S420N and S420NL steel?

S420N provides impact testing down to -20°C (40 J longitudinal), while S420NL extends this to -50°C (27 J longitudinal). Both are normalized fine-grain steels under EN 10025-3, but S420NL is ideal for arctic or sub-zero conditions.

What are the maximum thicknesses available for S420N plates?

Gangsteel supplies S420N plates up to 250 mm thick, with mechanical properties adjusted for thicker sections to maintain structural integrity.

Is S420N suitable for welding without preheating?

Yes, due to its low CEV (max 0.48), S420N exhibits excellent weldability. Preheating is typically not required for thicknesses under 50 mm, but consult project specifications for optimal procedures.

What certifications does Gangsteel provide with S420N 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 S420N 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.