The main difference is that S355J0WP is phosphorus-alloyed, making it superior for atmospheric and stack gas applications where its corrosion resistance is enhanced. In contrast, S355J0W has a higher carbon content and is a more general-purpose weathering steel suitable for a wider range of applications but is less ideal for stack gas or where phosphorus's properties are specifically needed.
S355J0W steel and S355J0WP steel chemical composition(%)
EN 10025-5 |
Number |
C max. |
Si max. |
Mn |
P |
S max. |
N max. |
Cr |
Cu |
|
S355J0W |
1.8959 |
0.16 |
0.50 |
0.50 - 1.50 |
max. 0.035 |
0.035 |
0.009 |
0.40 - 0.80 |
0.25-0.55 |
|
S355J0WP |
1.8945 |
0.12 |
0.75 |
max. 1.0 |
0.06 - 0.15 |
0.035 |
0.009 |
0.30 - 1.25 |
0.25-0.55 |
S355J0W steel and S355J0WP steel mechanical properties
EN 10025-5 |
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 |
|
S355J0WP |
355 |
345 |
- |
- |
- |
- |
510-680 |
470-630 |
|
Summary of differences
Phosphorus vs. Carbon: S355J0WP is a phosphorus-alloyed steel, while S355J0W has a higher carbon content.
Corrosion Resistance: S355J0WP is specifically formulated to resist atmospheric and stack gas corrosion better due to the phosphorus alloy, whereas S355J0W is a general weathering steel with good corrosion resistance.
Application: Use S355J0WP for applications involving stack gas, while S355J0W is a versatile option for many other structural uses, like bridges, containers, and general engineering equipment.
Load-bearing: S355J0WP is not recommended for high load-bearing structures, making S355J0W a better choice for those scenarios.
