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s420n vs s420nl

S420N vs S420NL: EN 10025-3 High-Strength Steel Comparison

As a premier exporter and manufacturer of high-quality structural steel plates, Gangsteel specializes in producing EN 10025-3 S420N and S420NL steel grades.

S420N vs S420NL— both are high-strength normalized fine-grain structural steels with 420 MPa yield strength, but differ only in impact toughness temperature.

Our S420N and S420NL plates are delivered in normalized (+N) condition for superior weldability and performance.

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

S420N vs S420NL: Key Differences

Property	S420N	S420NL
Impact Test Temperature	-20°C	-50°C
Min. Impact Energy (Longitudinal)	40 J	27 J
Min. Impact Energy (Transverse)	27 J	16 J
Best Application	Moderate cold climates	Arctic / offshore / extreme low-temp
Price Premium	Base	+10–15%
Availability	Standard stock	On request

All other properties(yield, tensile, elongation, chemistry) are identical.

Shared Mechanical Properties (Normalized, Min Values)

Thickness (mm)	Yield ReH (MPa)	Tensile Rm (MPa)	Elongation A (%)
≤ 16	420	520–680	19
16 < t ≤ 40	400	520–680	19
40 < t ≤ 63	390	520–680	19
63 < t ≤ 100	370–380	520–680	18
100 < t ≤ 250	340–360	500–650	18

Elongation per Lo = 5.65 √So.

Shared Chemical Composition (Max %)

Element	C	Si	Mn	P	S	Cr	Mo	Ni	V	Nb	Ti	Al	Cu	N	CEV
Max	0.20	0.60	1.00–1.70	0.025	0.020	0.30	0.10	0.80	0.20	0.05	0.05	≥0.020	0.55	0.025	0.48

S420N vs S420NL: When to Choose

Scenario	Recommended Grade
Moderate cold (-20°C)	S420N
Arctic / offshore (-50°C)	S420NL
Cost-sensitive, non-extreme	S420N
North Sea platforms, wind towers	S420NL

Why Gangsteel?

Dual Stock– S420N & S420NL
Full Certification– EN 10204 3.1/3.2
Testing– UT, Z35, HIC
Global Export

Contact: admin@gangsteel.comS420N Page: en 10025 3 s420n normalized structural steel plate S420NL Page: en 10025 3 s420nl normalized structural steel plate

Summary

S420N vs S420NL: Identical strength and chemistry — only impact temperature differs:

S420N: 40 J at -20°C → cost-effective for moderate cold
S420NL: 27 J at -50°C → essential for arctic/offshore

FAQ

What is the main difference between S420N and S420NL?

Only the impact test temperature and energy:

S420N: 40 J longitudinal at -20°C
S420NL: 27 J longitudinal at -50°C

All other specs (yield, tensile, chemistry) are the same.

Are S420N and S420NL chemically identical?

Yes— both have max 0.20% C, 1.00–1.70% Mn, CEV ≤ 0.48, and Al ≥ 0.020% for fine-grain structure.

When should I use S420N instead of S420NL?

Use S420N for:

Temperatures above -20°C
Cost optimization
General heavy structures (bridges, cranes)

When is S420NL required over S420N?

S420NLis mandatory when:

Exposure to -50°C (arctic, offshore wind, North Sea)
Codes require -50°C impact (DNV, ABS, Eurocode 3)

Can I substitute S420N for S420NL?

No— if -50°C toughness is specified, S420NL must be used. S420N may fail at lower temperatures.

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