| Grade : | P355NH | ||||||
| Number: | 1.0565 | ||||||
| Classification: | Non-alloy elevated temperature quality steel | ||||||
| Density: | 7.85 g/cm ³ | ||||||
| Standard: |
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p355nh steel is a normalized weldable fine grain steel used primarily for pressure vessels and boilers. It is defined by the EN 10028-3 standard and offers excellent strength, toughness, and weldability. Below is an overview of its properties, benefits, and applications:
Chemical Composition (Weight %) of EN 10028-3 P355nh steel
| Element | Composition (Max, unless range specified) |
|---|---|
| Carbon (C) | ≤ 0.20% |
| Manganese (Mn) | ≤ 1.60% |
| Phosphorus (P) | ≤ 0.025% |
| Sulfur (S) | ≤ 0.015% |
| Silicon (Si) | ≤ 0.40% |
| Aluminum (Al) | ≥ 0.020% |
Mechanical Properties of p355nh steel
| Property | Value |
|---|---|
| Yield Strength (ReH) | ≥ 355 MPa (51,500 psi) |
| Tensile Strength (Rm) | 470–630 MPa (68,200–91,400 psi) |
| Elongation (A) | ≥ 22% (in 200 mm gauge length) |
| Charpy V-Notch Impact | ≥ 40 J at -20°C (-4°F) |
Equivalent grades of steel P355NH (1.0565)
Warning! Only for reference
| EU EN |
USA - |
Germany DIN,WNr |
France AFNOR |
England BS |
Italy UNI |
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Heat treatment conditions
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Key Advantages of P355NH Boiler Steel
Excellent high‑temperature performance – maintains strength and creep resistance up to 400°C
Superior toughness – guaranteed 27 J impact energy at -20°C
Optimum weldability – low carbon equivalent (CEV typically ≤ 0.43) reduces preheat and post‑weld treatment requirements
Through‑thickness uniformity – normalizing eliminates internal stresses and delivers consistent properties
Full traceability – every plate is marked with heat number and supplied with EN 10204 Type 3.1 certification
Applications of P355NH in Boilers and Pressure Vessels
Thanks to its balance of strength, ductility, and thermal stability, P355NH boiler steel goes into a wide range of critical equipment:
- Steam boilers and superheater shells
- Autoclaves and digesters for the pulp & paper industry
- LPG bullets and ammonia storage spheres
- Heat exchangers and condensers
- Chemical and petrochemical reactor vessels
- High‑pressure piping and headers
Whether you are fabricating a simple air receiver or a complex multi‑chamber reactor, P355NH gives you the code‑compliant foundation you need. Talk to us about your project; we can supply plates cut to the exact blank size.
As a manufacturer with deep inventories and fast processing, GNEE eliminates those delays. Take advantage of our factory‑direct supply of P355NH steel for boilers and pressure vessels – fully certified, cut to your specs, and delivered on time. Click the "Request a Quote" button, send us your drawings or dimension list, and let our team create a tailor‑made offer that meets both your budget and your schedule. One message today can put your next pressure vessel into production faster than you expect.
What is P355NH steel grade?
A pressure vessel steel grade with good weldability and high resistance to brittle cracking, P355NH is used by the world's fabricators for the manufacture of pressure vessel tanks for the storage of pressurised gases. Other grade types include: P355 NH NL1 – is ideal for use in low temperatures.
What is the material specification 1.0565?
1.0565 is the EN numerical definition for this material. P355NH is the EN chemical designation. It has a very high embodied energy among processed carbon or unalloyed steels. In addition, it has a fairly high basic cost and moderately high electrical conductivity.
What is the yield strength of P355NH?
Material Description. 1) Remark: Steel P355NH is a weldable fine grained steel with a yield strength of max. 355 N/mm².
What is P355NH material?
P355NH is a pressure vessel steel to EN10028-3 that is used for high temperatures. It is normalised and fine grained with excellent weldability. Like other pressure vessel steel grades we carry large quantities in stock for immediate delivery.
