S420N and S420NL are normalized, fine-grain structural steels under EN 10025-3, offering the same strength (420 MPa yield) but differing in low-temperature toughness; S420N is tested for 40 Joules at -20°C, ideal for moderate cold, while S420NL offers superior performance, tested for 27 Joules at -50°C, making it suitable for arctic or offshore conditions where extreme cold resistance is crucial.
Chemical Composition of EN 10025-3 S420N
|
Element |
Ladle Analysis (max %) |
Product Analysis (max %) |
|---|---|---|
|
Carbon (C) |
0.20 |
0.23 |
|
Silicon (Si) |
0.60 |
0.70 |
|
Manganese (Mn) |
1.00-1.70 |
1.10-1.80 |
|
Phosphorus (P) |
0.025 |
0.035 |
|
Sulfur (S) |
0.015 |
0.025 |
|
Nitrogen (N) |
0.025 |
0.030 |
|
Aluminum (Al) |
0.020 (min, total) |
0.020 (min, total) |
|
Niobium (Nb) |
0.05 |
0.06 |
|
Vanadium (V) |
0.10 |
0.12 |
|
Titanium (Ti) |
0.05 |
0.07 |
|
Chromium (Cr) |
0.30 |
0.35 |
|
Nickel (Ni) |
0.80 |
0.85 |
|
Molybdenum (Mo) |
0.10 |
0.12 |
Chemical Composition of EN 10025-3 S420NL
|
Element |
Ladle Analysis (max %) |
Product Analysis (max %) |
|---|---|---|
|
Carbon (C) |
0.20 |
0.22 |
|
Silicon (Si) |
0.60 |
0.65 |
|
Manganese (Mn) |
1.00-1.70 |
0.95-1.80 |
|
Phosphorus (P) |
0.025 |
0.030 |
|
Sulfur (S) |
0.020 |
0.025 |
|
Nitrogen (N) |
0.025 |
0.027 |
|
Aluminum (Al) |
0.020 (min, total) |
0.015 (min, total) |
|
Niobium (Nb) |
0.05 |
0.06 |
|
Vanadium (V) |
0.20 |
0.22 |
|
Titanium (Ti) |
0.05 |
0.06 |
|
Chromium (Cr) |
0.30 |
0.35 |
|
Nickel (Ni) |
0.80 |
0.85 |
|
Molybdenum (Mo) |
0.10 |
0.12 |
|
Copper (Cu) |
0.55 |
0.60 |
Mechanical Properties of EN 10025-3 S420N
|
Thickness (mm) |
Yield Strength (min, MPa) |
Tensile Strength (MPa) |
Elongation (min, %) |
Impact Energy (min, J @ -20°C) |
|---|---|---|---|---|
|
≤16 |
420 |
520-680 |
19 |
27 |
|
16<t≤40 |
400 |
520-680 |
19 |
27 |
|
40<t≤63 |
390 |
520-680 |
19 |
27 |
|
63<t≤80 |
340 |
520-680 |
19 |
27 |
|
80<t≤100 |
290 |
520-680 |
19 |
27 |
|
100<t≤150 |
260 |
520-680 |
20 |
27 |
|
150<t≤200 |
220 |
500-650 |
20 |
27 |
Mechanical Properties of EN 10025-3 S420NL
|
Thickness (mm) |
Yield Strength (min, MPa) |
Tensile Strength (MPa) |
Elongation (min, %) |
Impact Energy (min, J @ -50°C, Longitudinal) |
|---|---|---|---|---|
|
≤16 |
420 |
520-680 |
19 |
27 |
|
16<t≤40 |
400 |
520-680 |
19 |
27 |
|
40<t≤63 |
390 |
520-680 |
19 |
27 |
|
63<t≤80 |
380 |
520-680 |
19 |
27 |
|
80<t≤100 |
360 |
520-680 |
19 |
27 |
|
100<t≤150 |
340 |
500-650 |
19 |
27 |
|
150<t≤200 |
330 |
500-650 |
19 |
27 |
Key Differences
S420N: Suitable for general construction and moderate cold environments, meeting impact requirements at -20°C.
S420NL: Designed for colder climates, offshore platforms, and heavy engineering, requiring impact toughness at -50°C.
Similarities
Standard: Both fall under EN 10025-3.
Strength: Both provide a minimum yield strength of 420 MPa.
Processing: Both are supplied in the normalized condition.
Composition: Share similar low-alloy, high-strength chemical compositions for good weldability.
Applications
S420N: General structural components, moderate-duty frameworks.
S420NL: Cranes, earthmoving equipment, bridges, shipbuilding, and offshore structures where extreme low-temp ductility is needed.
