P355N
1.0562Weldable fine-grained non-alloy steel for pressure vessels with minimum yield strength 355 MPa in normalized condition. N designation indicates impact testing at room temperature. Widely used medium-strength pressure vessel grade for boilers, heat exchangers, storage tanks, and process vessels. Also standardized for seamless tubes (EN 10216-3) and welded tubes (EN 10217-3). Equivalent to ASTM A537 Class 1.
Chemical composition comparison (wt%)
Side-by-side: P355N (EN) (EN 10028-3:2009) vs ASTM
| Element | P355N (EN) | ASTM | Overlap |
|---|---|---|---|
| C | ≤ 0.18% | — | — |
| Si | ≤ 0.5% | — | — |
| Mn | 1.1–1.7% | — | — |
| P | ≤ 0.025% | — | — |
| S | ≤ 0.015% | — | — |
| Cr | ≤ 0.3% | — | — |
| Mo | ≤ 0.08% | — | — |
| Ni | ≤ 0.5% | — | — |
| V | ≤ 0.1% | — | — |
| Nb | ≤ 0.05% | — | — |
Mechanical properties
Normalized
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 490–630 | MPa |
| Yield Strength | ≥ 355 | MPa |
| Elongation | ≥ 22 | % |
| impact_kv | ≥ 40 | J |
| Density | ≥ 7.85 | g/cm3 |
| Elastic Modulus | ≥ 210 | GPa |
Heat treatment
| Process | Temperature | Medium | Holding Time | Notes |
|---|---|---|---|---|
| normalizing | 900–940 °C | air | — | Delivered in normalized condition |
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P355NH
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