S355J0WP
1.8945Structural weathering steel with enhanced phosphorus content for accelerated patina formation and superior atmospheric corrosion resistance. Minimum yield strength 355 MPa with impact testing at 0°C. WP designation indicates higher P content (0.06-0.15%) compared to W grades. Available only as flat products up to 12mm thickness. Special welding precautions required due to elevated P. Used for severe atmospheric exposure, coastal (non-marine) structures, architectural facades, and applications requiring rapid patina development.
Chemical composition comparison (wt%)
Side-by-side: S355J0WP (EN) (EN 10025-5:2004) vs ASTM
| Element | S355J0WP (EN) | ASTM | Overlap |
|---|---|---|---|
| C | ≤ 0.12% | — | — |
| Si | ≤ 0.75% | — | — |
| Mn | ≤ 1% | — | — |
| P | 0.06–0.15% | — | — |
| S | ≤ 0.03% | — | — |
| Cr | 0.3–1.25% | — | — |
| Cu | 0.25–0.55% | — | — |
Mechanical properties
General
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 470–630 | MPa |
| Yield Strength | ≥ 355 | MPa |
| Elongation | ≥ 20 | % |
| impact_kv | ≥ 27 | J |
| Density | ≥ 7.85 | g/cm3 |
| Elastic Modulus | ≥ 210 | GPa |
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