P355NH Pressure Vessel Steel (EN 10028-3) — Normalized Fine-Grain Steel for Pressure Equipment
EN 10028-3 · Published: 2026-06-11 · Updated: 2026-06-12
P355NH is the European standard pressure vessel steel under EN 10028-3 for normalized fine-grain structural steels. It is the direct equivalent of ASTM A516 Grade 70 in US practice. Designed for pressure equipment operating at elevated and low...
P355NH is the European standard pressure vessel steel under EN 10028-3 for normalized fine-grain structural steels. It is the direct equivalent of ASTM A516 Grade 70 in US practice. Designed for pressure equipment operating at elevated and low temperatures, P355NH is delivered in normalized condition (NH = Normalisiert) with fine-grain microstructure for uniform mechanical properties and excellent weldability.
Quick Facts
| Category | |
| Standard | EN 10028-3 |
| Density | 7.85 g/cm³ |
| Yield Strength | 355 MPa |
| Tensile Strength | 490-630 MPa |
Global Equivalents & Cross-Reference
| Alternative Standard / Grade | Action |
|---|---|
| ASTM A516 Gr70 | Compare |
| JIS SB480M | Compare |
| GB 16MnDR | Compare |
| DIN 19Mn6 | Compare |
Related Materials
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Frequently Asked Questions
P355NH vs A516 Gr70 — interchangeable?
Functionally equivalent for most pressure vessel applications. Both are normalized fine-grain steels with 355 MPa / 485 MPa minimum yield/tensile. P355NH is certified to EN 10028-3 for Pressure Equipment Directive (PED) compliance in Europe. A516 Gr70 is certified to ASTM A516 for ASME Boiler and Pressure Vessel Code compliance. Material substitution requires re-certification to the applicable code.
References & International Standards
- ASTM International. Standard Specifications for Steel & Metal Alloys. astm.org
- International Organization for Standardization (ISO). Metallic Materials — Cross-Reference Database. iso.org
- American Iron and Steel Institute (AISI). Steel Grade Designations & Equivalents. steel.org
- European Committee for Standardization (CEN). EN Steel Standards & Numbering System. cencenelec.eu