en 10025-3 s420n

EN 10025-3 S420N: High-Strength Normalized Structural Steel Plate

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

S420Nis a normalized fine-grain structural steel designed for heavy-duty welded constructions requiring high yield strength and excellent toughness, even at low temperatures.

Ideal for bridges, offshore platforms, cranes, and high-rise buildings, our S420N plates are delivered in normalized (+N) condition to ensure superior weldability and performance.

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

What is EN 10025-3 S420N Steel?

S420N(material number 1.8902) is a high-strength, low-alloy (HSLA) fine-grain structural steel under EN 10025-3. The designation breaks down as:

• S= Structural steel
• 420= Minimum yield strength of 420 MPa (≤16 mm)
• N= Normalized delivery condition
• L(in S420NL) = Low-temperature impact test at -50°C

Compared to standard S420 grades in EN 10025-2, S420N offers fine-grain refinement through controlled rolling and normalization, improving toughness and weldability.

Gangsteel produces S420N in thicknesses up to 250 mm, with precise CEV control for optimal fabrication.

Chemical Composition of S420N (Ladle Analysis, Max %)

CEV = C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15Ensures excellent weldability — preheating typically not required for ≤50 mm.

Mechanical Properties of S420N (Normalized, Min Values)

Transverse impact: 27 J min at -20°C. Elongation per Lo = 5.65 √So.

S420N vs S420NL: Key Differences

Choose S420NLfor extreme low-temperature environments. See our en 10025 3 s420nl normalized structural steel plate.

S420N Equivalent Grades

S420NCis not standard — likely a typo for S420N or S420MC (thermomechanical).

Applications of S420N Steel

• Heavy Bridges& Viaducts
• Offshore Platforms(moderate climates)
• Cranes& Lifting Equipment
• High-Rise Buildings& Towers
• Pressure Vessels& Penstocks

Why Choose Gangsteel for S420N?

• Mill-Direct Supply– Competitive pricing
• Full Certification– EN 10204 3.1/3.2, UT, Z-test
• Stock Availability– 6 mm to 250 mm
• Global Export– FOB/CIF, fast delivery
• Custom Processing– Cutting, bending, welding

Contact: admin@gangsteel.com| Visit: en 10025 3 s420n normalized structural steel plate

Summary

EN 10025-3 S420Nis a high-strength normalized structural steel with 420 MPa yield, 520–680 MPa tensile strength, and 40 J impact at -20°C. It offers superior weldability and toughness for heavy welded structures. For -50°C applications, upgrade to S420NL.

FAQ

What does S420N mean?

S= Structural, 420 = 420 MPa yield, N = Normalized, tested at -20°C.

Is S420N the same as S420NL?

No— S420N is tested at -20°C, S420NL at -50°C for arctic use.

What is the ASTM equivalent of S420N?

A572 Grade 65— normalized, 450 MPa yield.

Is S420NC a real grade?

No— likely a typo. Use S420N or S420MC (thermomechanical).

Can S420N be welded without preheating?

Yesup to 50 mm due to CEV ≤0.48; use low-hydrogen fillers.