S420NL steel yield strength with EN 10025-3

S420NL Steel Yield Strength with EN 10025-3

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.

Ideal for heavy-duty applications in bridges, cranes, and offshore structures, 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.

Overview of S420NL Steel

S420NL, designated as 1.8912 under EN 10025-3, is a high-strength low-alloy (HSLA) fine-grain structural steel. The "NL" suffix indicates normalized delivery with low-temperature impact testing at -50°C (27 J minimum longitudinal), making it suitable for arctic or sub-zero environments. This grade is optimized for welded structures where brittle fracture resistance is critical, distinguishing it from milder variants like S355NL.

Gangsteel produces S420NL plates in thicknesses up to 250 mm, with controlled chemistry for optimal CEV (≤0.48) and weldability. Our plates undergo rigorous testing, including ultrasonic and Charpy impact, to meet global standards.

Chemical Composition of S420NL Steel

The chemical composition is balanced for strength, ductility, and low-temperature toughness (ladle analysis, max % unless noted, ≤100 mm thickness).

*Note: Low P/S improve toughness; Al ensures grain refinement.

Yield Strength of S420NL Steel with EN 10025-3

According to EN 10025-3, the yield strength (ReH) of S420NL varies by thickness, ensuring adaptability for various fabrication needs (minimum values in MPa for normalized condition).

*Note: Values decrease with thickness to maintain ductility; test direction transverse.

Heat Treatment Guide for S420NL Steel

S420NL is supplied in normalized (+N) condition, involving heating to 880–920°C, soaking, and air cooling to refine grain structure.

• Preheating for Welding: Not required ≤50 mm; 100–150°C for thicker (CEV ≤0.48).
• PWHT: Optional 550–650°C stress-relief.
• Hot Forming: >850°C; re-normalize if <720°C.

Follow EN 1011-2. Gangsteel optimizes for minimal heat treatment.

Applications of S420NL Steel

• Heavy Engineering: Cranes, frameworks.
• Infrastructure: Bridges, offshore.
• Construction: Shipbuilding, vessels.

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Why Gangsteel for S420NL Steel?

With ISO-certified quality, Gangsteel delivers S420NL plates tailored to specifications, stocked for immediate export. Visit our en 10025 3 s420nl normalized structural steel plate page for details.

Summary

EN 10025-3 S420NL steel yield strength ranges from 420 MPa (≤16 mm) to 340 MPa (200–250 mm), as per the standard. This normalized fine-grain steel ensures high ductility and -50°C toughness (27 J) for cold welded structures like bridges and offshore platforms. S420NL from Gangsteel provides reliable performance for global projects.

FAQ

What is the yield strength of S420NL for thicknesses up to 16 mm?

The minimum yield strength (ReH) is 420 MPa for thicknesses ≤ 16 mm.

How does the yield strength change with thickness in S420NL?

Yield strength decreases with thickness: 400 MPa (16–40 mm), 390 MPa (40–63 mm), down to 340 MPa (200–250 mm), to maintain ductility.

What is the minimum yield strength for S420NL at 100–150 mm thickness?

The minimum yield strength is 360 MPa for 100–200 mm thicknesses.

Is the yield strength the same for all directions in S420NL?

Yield strength is tested transverse to rolling direction, per EN 10025-3, ensuring consistent performance in welded structures.

What is the maximum thickness for full yield strength in S420NL?

Full 420 MPa yield is for ≤16 mm; beyond, it adjusts to 340 MPa at 250 mm, as per EN 10025-3.