S355J2 and S355J2W are high-strength structural steels with the same minimum yield strength (355 MPa), but the key difference is S355J2W is a weathering steel (EN 10025-5) with added alloying elements (Cu, Cr, Ni, etc.) for enhanced atmospheric corrosion resistance, forming a protective rust-like patina, while S355J2 (EN 10025-2) is a standard non-alloy structural steel, needing coatings for protection, making S355J2W ideal for exposed architectural and heavy outdoor structures, whereas S355J2 suits general construction.
Chemical composition of S355J2
|
C |
Si |
Mn |
Ni |
P |
S |
Cr |
Mo |
|
max 0.24 |
0.60 |
1.70 |
|
Max 0.035 |
Max 0.035 |
|
|
|
V |
Nb |
Ti |
N |
Cu |
|
|
|
|
|
|
|
|
0.60 |
|
|
|
Chemical composition of S355J2W
|
C |
Si |
Mn |
Cu |
P |
S |
Cr |
N |
|
0.19 |
0.55 |
0.45-1.60 |
0.20-0.60 |
0.035 |
0.035 |
0.35-0.85 |
0.010 |
Mechanical properties of grade S355J2
|
|
-150 |
150-250 |
250-400 |
|
Minimum energy nominal thicknessTemperature(-20) |
27 |
27 |
27 |
|
Nominal thickness (mm) |
to 16 |
16 - 40 |
40 - 63 |
63 - 80 |
80 - 100 |
100 - 150 |
150 - 200 |
200-250 |
250-400 |
|
ReH - Minimum yield strength (MPa) |
355 |
345 |
335 |
325 |
315 |
295 |
285 |
275 |
265 |
|
Nominal thickness (mm) |
-3 |
3-100 |
100-150 |
150-250 |
250-400 |
|
Rm -Tensile strength (MPa) |
510-680 |
470-630 |
450-600 |
450-600 |
450-600 |
|
Nominal thickness (mm) |
3-40 |
40-63 |
63-100 |
100-150 |
150-250 |
250-400 |
|
A - Minimum elongation Lo = 5,65 √ So (%) |
22 |
21 |
20 |
18 |
17 |
17 |
Mechanical properties of grade S355J2W
|
Temperature |
-20 |
-10 |
0 |
20 |
|
Notch impact test. Min. absorbed energy J |
27 |
|
Nominal thickness (mm) |
to 16 |
16 - 40 |
40 - 63 |
63 - 80 |
80 - 100 |
100 - 150 |
|
ReH - Minimum yield strength (MPa) |
355 |
345 |
335 |
325 |
315 |
295 |
|
Nominal thickness (mm) |
to 3 |
3 - 100 |
100-150 |
|
Rm -Tensile strength (MPa) |
510-680 |
470-630 |
450-600 |
|
Nominal thickness (mm) |
≥1.5＜2 |
≥2﹤2.5 |
≥2.5＜3 |
≥3＜40 |
≥40﹤63 |
≥6﹤100 |
≥100﹤150 |
|
A - Minimum elongation Lo = 5,65 √ So (%) Longitudinal |
16 |
17 |
18 |
22 |
21 |
20 |
18 |
S355J2 Steel
Type: Non-alloy structural steel.
Key Feature: Good weldability, high strength (min 355 MPa yield).
Corrosion Resistance: Standard, requires painting/coating.
Impact Test: J2 means 27 Joules at 20°C (room temp).
Applications: General construction, bridges, machinery frames, tanks.
S355J2W Steel (Weathering Steel)
Type: Structural steel with improved atmospheric corrosion resistance (EN 10025-5).
Key Feature: Forms a stable, protective patina (rust layer) when exposed to weather, eliminating painting needs.
Alloys: Contains Copper (Cu), Chromium (Cr), Nickel (Ni).
Impact Test: Also has J2 (27J at 20°C) and good low-temp toughness.
Applications: Architectural facades, sculptures, bridges, chimneys, railway wagons, outdoor art/furniture.
