P355NH
1.0565Weldable fine-grained non-alloy steel for pressure vessels with minimum yield strength 355 MPa. NH designation indicates normalized condition with specified elevated temperature properties and impact testing at -20°C. Very widely used pressure vessel grade for boilers, storage tanks, heat exchangers, and pipes transporting hot liquids and pressurized gases. Good weldability and resistance to brittle cracking.
Chemical composition comparison (wt%)
Side-by-side: P355NH (EN) (EN 10028-3:2009) vs ASTM
| Element | P355NH (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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