Scope of application of EN 10025 S420NL steel plate

EN 10025 S420NL Steel Plate Scope of Application

As a premier exporter and manufacturer of high-quality structural steel plates, Gangsteel specializes in producing EN 10025-3 compliant materials, including the versatile S420NL steel grade.

S420NL is a normalized fine-grain structural steel designed for welded constructions requiring enhanced toughness at low temperatures, down to -50°C.

The EN 10025 S420NL steel plate scope of application includes heavily loaded welded structures in demanding environments, where its high strength and low-temperature ductility are critical.

Our S420NL 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 EN 10025 S420NL Steel Plate?

EN 10025 S420NL steel plate is a high-strength low-alloy (HSLA) fine-grain structural steel specified in EN 10025-3:2019, with a minimum yield strength of 420 MPa and excellent impact resistance at -50°C. The EN 10025 S420NL steel plate scope of application focuses on welded parts that must withstand high levels of strain, making it suitable for environments where low-temperature toughness is essential.

Gangsteel produces S420NL 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 EN 10025 S420NL Steel Plate

The chemical makeup of S420NL 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.

*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 EN 10025 S420NL Steel Plate

S420NL exhibits robust mechanical characteristics, with properties varying by thickness to accommodate diverse fabrication needs. All values are for normalized (+N) condition.

*Notes: Elongation based on Lo = 5.65 √So. Impact values are minimums; higher at warmer temperatures. These properties position S420NL as a cost-effective choice for structures needing high toughness, outperforming standard S420JR in sub-zero conditions.

Heat Treatment Guide for S420NL Steel

S420NL steel 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 ≤ 50 mm; recommend 100–150°C for thicker sections to prevent cold cracking, based on CEV ≤ 0.48.
• 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.

Scope of Application of EN 10025 S420NL Steel Plate

The scope of application of EN 10025 S420NL steel plate includes heavily loaded welded structures that must withstand high levels of strain in cold environments. It is primarily used for large ships, bridges, power plant equipment, medium and high pressure boilers, high pressure vessels, locomotives, rolling stock, and other applications requiring low-temperature toughness and high strength.

Equivalent Grades to S420NL

Why Choose Gangsteel for S420NL Steel?

With state-of-the-art mills and a commitment to ISO-certified quality, Gangsteel delivers S420NL 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 s420nl normalized structural steel plate product page or contact our sales team today.

Summary

The scope of application of EN 10025 S420NL steel plate encompasses heavily stressed welded structures in demanding environments, such as large ships, bridges, power plant equipment, boilers, pressure vessels, locomotives, and rolling stock, where high strength and low-temperature toughness are critical. S420NL from Gangsteel ensures durability for global projects.

FAQ

What is the scope of application of EN 10025 S420NL steel plate?

The scope of application of EN 10025 S420NL steel plate includes heavily loaded welded structures that must withstand high levels of strain, such as large ships, bridges, power plant equipment, medium and high pressure boilers, high pressure vessels, locomotives, and rolling stock.

What makes EN 10025 S420NL steel plate suitable for these applications?

Its high strength (420 MPa yield), low-temperature toughness (27 J at -50°C), and fine-grain structure make EN 10025 S420NL steel plate ideal for cold climates and high-strain environments.

Is EN 10025 S420NL steel plate used in offshore structures?

Yes, the scope of application of EN 10025 S420NL steel plate extends to offshore platforms and long-span structures where low-temperature ductility is critical.

What industries benefit from EN 10025 S420NL steel plate?

The scope of application of EN 10025 S420NL steel plate covers industries like shipbuilding, power generation, transportation (locomotives, rolling stock), and construction (bridges, heavy machinery).

Can EN 10025 S420NL steel plate be used in high-pressure vessels?

Yes, the scope of application of EN 10025 S420NL steel plate includes medium and high pressure boilers and high pressure vessels due to its high strength and weldability.