S235J2W and S235J2WP are both weathering steels with improved atmospheric corrosion resistance, but the key difference lies in the "WP" vs. "W" designation and their specified phosphorus (P) content, where S235J2WP has a controlled, higher phosphorus content (0.05-0.16%) for better patina formation, while S235J2W has a lower, uncontrolled phosphorus level, with the "W" simply denoting weathering resistance (improved corrosion) and "J2" indicating toughness at -20°C (27J).
S235: Same base steel; "S" for structural, "235" for minimum yield strength (235 MPa).
J2: Indicates impact toughness, requiring 27 Joules at -20°C.
W (Weathering): Signifies improved atmospheric corrosion resistance due to added alloying elements (like Cu, Cr, Ni, P).
P (Phosphorus): The distinguishing factor in the "WP" suffix, indicating a controlled, higher phosphorus content (often 0.05-0.16%) compared to standard S235J2W, which has lower P but still benefits from "W" additions for patina.
S235J2W Chemical composition
|
C |
Si |
Mn |
Cu |
P |
S |
Cr |
N |
|
0.16 |
0.45 |
0.15-0.70 |
0.20-0.60 |
0.040 |
0.035 |
0.35-0.85 |
0.010 |
S235J2WP Chemical composition
|
C % |
Mn % |
Cr % |
Si % |
CEV % |
S % |
Cu % |
P % |
|
Max 0.13 |
0.2-0.6 |
0.4-0.8 |
Max 0.4 |
Max 0.44 |
Max 0.03 |
0.25-0.55 |
Max 0.035 |
S235J2W Mechanical propertie
|
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) |
235 |
225 |
215 |
215 |
215 |
195 |
|
Nominal thickness (mm) |
to 3 |
3 - 100 |
100-150 |
|
Rm -Tensile strength (MPa) |
360-510 |
360-510 |
350-500 |
S235J2WP Mechanical propertie
|
Grade |
Min. Yield Strength Mpa |
Tensile Strength MPa |
Impact |
||||||||
|
S235J2W |
Nominal Thickness (mm) |
Nominal Thickness (mm) |
degree |
J |
|||||||
|
Thick mm |
≤16 |
>16 |
>40 |
>63 |
>80 |
>100 |
≤3 |
>3 ≤100 |
>100 ≤150 |
-20 |
27 |
|
S235J2WP |
235 |
225 |
215 |
215 |
215 |
195 |
360-510 |
360-510 |
350-500 |
||
