S355NL and S460NL are European standard (EN 10025-3) fine-grained structural steels, both normalized for excellent low-temperature toughness (tested at -50°C), but S460NL offers significantly higher strength (minimum yield 460 MPa) compared to S355NL (minimum yield 355 MPa), making S460NL suitable for heavier, high-stress applications like large bridges, wind towers, and offshore structures, while S355NL serves general heavy structural needs.
Chemical Composition of S355NL
|
Element |
Ladle Analysis |
Product Analysis |
|---|---|---|
|
Carbon (C) |
max 0.18% |
max 0.20% |
|
Silicon (Si) |
max 0.50% |
max 0.55% |
|
Manganese (Mn) |
0.90-1.65% |
0.85-1.75% |
|
Phosphorus (P) |
max 0.025% |
max 0.035% |
|
Sulfur (S) |
max 0.015% |
max 0.025% |
|
Nitrogen (N) |
max 0.015% |
max 0.017% |
|
Aluminum (Al) |
min 0.02% (total) |
min 0.015% (total) |
|
Niobium (Nb) |
max 0.05% |
max 0.06% |
|
Vanadium (V) |
max 0.12% |
max 0.15% |
|
Titanium (Ti) |
max 0.05% |
max 0.06% |
|
Chromium (Cr) |
max 0.30% |
max 0.35% |
|
Nickel (Ni) |
max 0.30% |
max 0.35% |
|
Molybdenum (Mo) |
max 0.10% |
max 0.13% |
|
Copper (Cu) |
max 0.55% |
max 0.60% |
Chemical Composition of S460NL
|
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 S355NL
|
Thickness (mm) |
Yield Strength (min, MPa) |
Tensile Strength (MPa) |
Elongation (min, %) |
Impact Energy (min, J @ -50°C, Longitudinal) |
|---|---|---|---|---|
|
≤16 |
355 |
470-630 |
22 |
27 |
|
16<t≤40 |
345 |
470-630 |
22 |
27 |
|
40<t≤63 |
335 |
470-630 |
22 |
27 |
|
63<t≤80 |
325 |
470-630 |
21 |
27 |
|
80<t≤100 |
305 |
470-630 |
21 |
27 |
|
100<t≤150 |
285 |
450-610 |
21 |
27 |
|
150<t≤200 |
265 |
450-610 |
21 |
27 |
|
200<t≤250 |
245 |
450-610 |
21 |
27 |
Mechanical Properties of S460NL
|
Thickness (mm) |
Yield Strength (min, MPa) |
Tensile Strength (MPa) |
Elongation (min, %) |
Impact Energy (min, J @ -50°C, Longitudinal) |
|---|---|---|---|---|
|
≤16 |
460 |
540-720 |
17 |
27 |
|
16<t≤40 |
440 |
540-720 |
17 |
27 |
|
40<t≤63 |
430 |
540-720 |
17 |
27 |
|
63<t≤80 |
410 |
540-720 |
17 |
27 |
|
80<t≤100 |
400 |
540-720 |
17 |
27 |
|
100<t≤150 |
380 |
520-680 |
17 |
27 |
|
150<t≤200 |
370 |
520-680 |
17 |
27 |
Key Differences
Strength: S460NL has superior tensile and yield strength.
Applications: S460NL handles heavier loads and more demanding strains.
Performance: Both offer excellent weldability and toughness, but S460NL provides higher performance for critical, high-strain demands.
