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en 10025-3 s420n and s420nl

EN 10025-3 S420N and S420NL: High-Strength Normalized Steels

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

EN 10025-3 S420N and S420NLare high-strength, low-alloy (HSLA), fine-grain normalized structural steels with 420 MPa minimum yield strength.

They differ only in impact toughness temperature:

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

Both are ideal for heavy welded constructions such as bridges, offshore platforms, cranes, high-rise buildings, and pressure vessels.

Our S420N and S420NL plates are delivered in normalized (+N) condition.

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

EN 10025-3 S420N and S420NL Overview

Grade	Material No.	Impact Test	Min. Impact (Long.)
S420N	1.8902	-20°C	40 J
S420NL	1.8912	-50°C	27 J

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

Chemical Composition (Ladle Analysis, 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

Al ≥ 0.020%= fine-grain refinement via AlN.

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 ≤ 80	380	520–680	18
80 < t ≤ 100	370	520–680	18
100 < t ≤ 200	360	500–650	18
200 < t ≤ 250	340	500–650	18

Elongation per Lo = 5.65 √So.

Impact Toughness Difference

Grade	Longitudinal	Transverse
S420N	40 J at -20°C	27 J at -20°C
S420NL	27 J at -50°C	16 J at -50°C

Equivalent Grades

Standard	S420N	S420NL
ASTM	A572 Gr. 65	A572 Gr. 65 (with -50°C spec)
DIN	TStE 420	TStE 420 L
JIS	SM570	SM570 (with -50°C spec)
GB	Q420B	Q420D/E

Applications

Grade	Best For
S420N	Bridges, cranes, high-rise (moderate cold)
S420NL	Offshore, arctic, wind towers (-50°C)

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

EN 10025-3 S420N and S420NLare identical high-strength normalized steels with 420 MPa yield and 520–680 MPa tensile. Only difference:

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

FAQ

What is the difference between S420N and S420NL?

Only impact toughness:

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

All other specs (strength, chemistry) are the same.

Are S420N and S420NL chemically identical?

Yes— same composition, same CEV ≤ 0.48, same alloying.

When to use S420N vs S420NL?

S420N: -20°C exposure (bridges, cranes)
S420NL: -50°C exposure (offshore, arctic)

Can S420N replace S420NL?

No— if -50°C is required, S420NL must be used.

What is the ASTM equivalent?

A572 Gr. 65(normalized). Specify -50°C impact for S420NL.

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