EN 10025-4 S420ML Steel Plates

High-strength, fine-grained structural steel plate produced to EN 10025-4 standard. S420ML is a thermomechanically rolled (TMCP) low-alloy grade with a minimum yield strength of 420 N/mm² and good low-temperature toughness (L). The material is weldable and offers excellent flangeability, enabling lighter, more efficient welded structures and fewer weld seams without compromising durability.

Key features

• Standard: EN 10025-4
• Grade: S420ML (thermo-mechanically rolled, low-temperature tough)
• Yield strength: 420 N/mm² (nominal)
• Heat treatment: Thermo-Mechanical Control Process (TMCP)
• Important processing note: reheating above ~580°C can reduce the thermomechanically developed strength

Typical dimensions (available ranges)

• Thickness: 5 mm – 150 mm
• Width: 1,500 mm – 3,550 mm
• Length: 3,000 mm – 18,000 mm

Common applications

• Welded and load-bearing structures (bridges, frames, support structures)
• Fixed and movable storage containers
• Pressure and pipeline components where high strength and toughness are required
• Fabricated steel components that benefit from reduced plate thickness and improved formability

Commercial options and supply considerations

• Supplied in thermo-mechanically rolled condition
• Suitable for common welding and forming processes (confirm joint design and PWHT as required by application)
• Mill test/certification and dimensional cutting or processing can be supplied on request (specify delivery condition and inspection requirements at RFQ stage)

For RFQs, specify required plate thickness, width/length tolerances, surface condition, and any certification or testing standards required so offers can be tailored to your project needs.