S355J0W and S355J2W are European standard (EN 10025-5) weathering steels, also known as Corten steels, that develop a protective rust layer for corrosion resistance, with the key difference being S355J2W offers better low-temperature impact strength (27J at -20°C) compared to S355J0W (usually 27J at 0°C or unspecified), making S355J2W better for heavy, load-bearing structures in colder conditions. Both are high-strength, low-alloy steels with added elements (Cu, Cr, Ni, Mo, P) for this self-protection, suitable for unpainted architectural uses but avoid condensation/chlorine.
Chemical Composition of S355J0W
|
Grade |
C |
Si |
Mn |
P |
S |
N |
Addition of |
Cr |
Cu |
|
S355J0W |
0.16 |
0.50 |
0.50/1.50 |
0.035 |
0.035 |
0.009 |
– |
0.40/0.80 |
0.25/0.55 |
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 S355J0W
|
Grade |
Min. Yield Strength Reh MPa |
Tensile Strength Rm MPa |
|||||||
|
Nominal Thickness (mm) |
Nominal Thickness (mm) |
||||||||
|
≤16 |
>16 ≤40 |
>40 ≤63 |
>63 ≤80 |
>80 ≤100 |
>100 ≤150 |
>3 |
>3 ≤100 |
>100 ≤150 |
|
|
S355J0W |
355 |
345 |
335 |
325 |
315 |
295 |
510/680 |
470/630 |
450/600 |
Mechanical Properties of S355J2W
| Grade | Min Yield strength in different thickness | Min tensile strength in different thickness | |||||||
| S355J2W | ≤ 16 |
> 16 ≤ 40 |
> 40 ≤ 63 |
> 63 ≤ 80 |
> 80 ≤ 100 |
> 100 ≤ 150 |
≤ 3 |
> 3 ≤ 100 |
> 100 ≤ 150 |
| 355 | 345 | 335 | 325 | 315 | 295 | 510- 680 |
470- 630 |
450-600 | |
Key Similarities:
Weathering Steel: Both form a stable, protective oxide layer (patina) when exposed to the atmosphere, eliminating the need for painting.
High Strength: Both have a minimum yield strength of 355 MPa (hence "S355").
Weldability: Excellent weldability due to low carbon content and fine-grained structure.
Applications: Used in construction, bridges, facades, and other structures where aesthetic rust is desired.
