S275N and S460N are structural steels under EN 10025-3, for low-temperature use, with the key difference being strength: S460N offers a higher minimum yield strength (460 MPa) than S275N (275 MPa), making it suitable for heavier loads in bridges, cranes, and high-rise buildings, while S275N is for general structures, with 'N' indicating normalization for improved toughness at moderate low temperatures (around -20°C).
Chemical Composition of S275N
|
Element |
Symbol |
Min (%) |
Max (%) |
|---|---|---|---|
|
Carbon |
C |
- |
0.18 |
|
Silicon |
Si |
- |
0.40 |
|
Manganese |
Mn |
0.50 |
1.50 |
|
Phosphorus |
P |
- |
0.035 |
|
Sulfur |
S |
- |
0.035 |
|
Nitrogen |
N |
- |
0.015 |
|
Niobium |
Nb |
- |
0.05 |
|
Vanadium |
V |
- |
0.05 |
|
Titanium |
Ti |
- |
0.05 |
|
Aluminum |
Al |
0.020 |
- |
|
Copper |
Cu |
- |
0.55 |
|
CEV |
- |
- |
0.40 |
Chemical Composition of S460N
|
Element |
Ladle Analysis (max %) |
Product Analysis (max %) |
|---|---|---|
|
Carbon (C) |
0.20 |
0.23 |
|
Silicon (Si) |
0.60 |
0.70 |
|
Manganese (Mn) |
1.70 |
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) |
0.12 |
0.15 |
|
Titanium (Ti) |
0.05 |
0.07 |
Mechanical Properties of S275N
|
Nominal Thickness (mm) |
Yield Strength ReH Min (MPa) |
Tensile Strength Rm (MPa) |
Elongation A Min (%) |
Charpy KV Longitudinal Min (J) at -20°C |
Charpy KV Transverse Min (J) at -20°C |
|---|---|---|---|---|---|
|
≤ 16 |
275 |
370–530 |
23 |
47 |
31 |
|
16 < t ≤ 40 |
265 |
370–530 |
23 |
47 |
31 |
|
40 < t ≤ 63 |
255 |
370–530 |
23 |
47 |
31 |
|
63 < t ≤ 80 |
245 |
370–530 |
22 |
47 |
31 |
|
80 < t ≤ 100 |
235 |
370–530 |
22 |
47 |
31 |
|
100 < t ≤ 150 |
225 |
350–510 |
22 |
47 |
31 |
|
150 < t ≤ 200 |
215 |
350–510 |
22 |
47 |
31 |
|
200 < t ≤ 250 |
195 |
350–510 |
22 |
47 |
31 |
Mechanical Properties of S460N
|
Thickness (mm) |
Yield Strength (min, MPa) |
Tensile Strength (MPa) |
Elongation (min, %) |
Impact Energy (min, J @ -20°C) |
|---|---|---|---|---|
|
≤16 |
460 |
540-720 |
17 |
27 |
|
16<t≤40 |
460 |
540-720 |
17 |
27 |
|
40<t≤63 |
440 |
570-720 |
17 |
27 |
|
63<t≤80 |
400 |
570-720 |
17 |
27 |
|
80<t≤100 |
380 |
570-720 |
17 |
27 |
|
100<t≤150 |
340 |
540-720 |
18 |
27 |
Key Differences
Strength: S460N is significantly stronger with a yield strength of 460 MPa, compared to S275N's 275 MPa yield strength (for thicknesses up to 16mm).
Applications: S460N is for high-strength needs like heavy machinery, bridges, and arctic offshore structures, while S275N is used in general buildings and pipelines.
Performance: S460N provides a higher strength-to-weight ratio, allowing for lighter designs.
Similarities
Standard: Both are normalized (N) structural steels from EN 10025-3, designed for good weldability and toughness in cold conditions.
Microstructure: Both have fine-grain microstructures for strength.
