P355NH steel is characterised by good weldability and high resistance to brittle cracking. These types are used above all for manufacturing vessels for pressurised gas (LPG, butane and propane tanks), pressure vessels, parts for steam boilers, pressure piping, compressors, etc. Its most widespread use is in application environments up to 400 ºC.
P355NH steel is supplied in the normalised condition. The normalising temperature is 900 - 950 ºC, and it must be left in the furnace after temperature equalising for approximately 1 minute per millimetre of thickness of the plate. As a result, it offers good cold-forming and hot-forming properties without negatively affecting the material properties.
The fine grained structural steel in this series can be perfectly welded, both manually and using automatic equipment, by means of all known welding processes.
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Chemical Composition of P355NH Steel
The chemical composition of P355NH pressure vessel steel plate ensures a balance of strength, toughness, and weldability.
| Element | P355NH (%) | P355NL1 (%) | P355NL2 (%) |
|---|---|---|---|
| C | ≤0.18 | ≤0.18 | ≤0.18 |
| Si | ≤0.50 | ≤0.50 | ≤0.50 |
| Mn | 1.10–1.70 | 1.10–1.70 | 1.10–1.70 |
| P | ≤0.025 | ≤0.025 | ≤0.020 |
| S | ≤0.015 | ≤0.015 | ≤0.010 |
| Cr | ≤0.30 | ≤0.30 | ≤0.30 |
| Mo | ≤0.08 | ≤0.08 | ≤0.08 |
| Ni | ≤0.50 | ≤0.50 | ≤0.50 |
| Nb | ≤0.05 | ≤0.05 | ≤0.05 |
| Ti | ≤0.03 | ≤0.03 | ≤0.03 |
| V | ≤0.10 | ≤0.10 | ≤0.10 |
| N | ≤0.012 | ≤0.012 | ≤0.012 |
| Al | ≥0.020 | ≥0.020 | ≥0.020 |
| Cu | ≤0.30 | ≤0.30 | ≤0.30 |
The combined content of Nb + V + Ti should not exceed 0.12%, ensuring stable grain refinement and improved mechanical performance.
Mechanical Properties of P355NH Steel Plate
| Grade | Thickness (mm) | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) |
|---|---|---|---|---|
| P355NH | ≤16 | ≥355 | 490–630 | ≥21 |
| P355NL1 | ≤40 | ≥345 | 490–630 | ≥21 |
| P355NL2 | ≤60 | ≥335 | 490–630 | ≥21 |
| 60–100 | ≥315 | 470–610 | ≥21 | |
| 100–150 | ≥305 | 460–600 | ≥21 | |
| 150–250 | ≥295 | 450–590 | ≥21 |
These properties demonstrate that P355NH pressure vessel steel plate offers higher strength than P275 grades, making it suitable for more demanding pressure
Equivalent steel grade of P355NH
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Equivalent steel grade of P355NH |
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Europe |
Belgium |
Germany |
France |
Italy |
Sweden |
India |
Japan |
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W St E355 |
A52 AP |
Fe510-2-KW |
SS 21,07,01 |
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Key features and applications of P355NH pressure vessel steel
Pressure Vessel Steel: P355NH pressure vessel steel is specifically designed for use in pressure vessels and boilers, where it needs to withstand high-pressure conditions. This makes it an ideal choice for industries requiring materials capable of withstanding demanding environments.
Normalised and Fine-Grain Structure: P355NH undergoes normalisation, a controlled heating and cooling process that refines its grain structure. This process enhances the steel's mechanical properties, including toughness and strength, and makes it particularly suitable for welding applications.
Elevated Temperature Resistance: The steel is engineered to perform well at elevated temperatures, ensuring it maintains its strength and structural integrity even under high-temperature conditions. This is crucial for applications involving boilers and pressure vessels that operate at elevated temperatures.
Chemical Composition: P355NH contains elements like carbon, manganese, phosphorus, sulfur, silicon, and trace amounts of other alloying elements. The composition is carefully controlled to meet required mechanical properties and toughness standards.
Compliance with Standards: P355NH steel complies with European standards, including EN 10028-3, ensuring consistent quality and performance in pressure vessel applications.
Versatility: Beyond pressure vessels and boilers, P355NH steel may find application in heat exchangers, piping systems, and storage tanks in various industries that require materials capable of withstanding high-pressure and high-temperature conditions.
Weldability: P355NH steel exhibits excellent weldability, allowing it to be readily welded using conventional welding techniques. This property simplifies the fabrication process for pressure vessels and ensures reliable weld joints.
Corrosion Resistance: While P355NH is not inherently corrosion-resistant, it can be protected against corrosion through proper surface treatments or coatings, particularly in applications where exposure to corrosive substances is a concern.
P355NH Steel Inventory and Supply Specifications at GNEE
We maintain a rolling stock of over 3,000 metric tons of P355NH plates, ready for immediate dispatch. This enables us to fulfill urgent orders without the usual mill lead times.
Standard Supply Range
| Parameter | Availability |
|---|---|
| Thickness | 6 mm – 250 mm |
| Width | 1,500 mm – 4,000 mm |
| Length | 3,000 mm – 18,000 mm |
| Delivery Condition | Normalized (N) |
| Surface | As‑rolled and shot‑blasted |
| Certification | EN 10204 3.1 as standard, 3.2 on demand |
| Code Compliance | ASME Section II (under SA/EN 10028‑3 equivalent) and PED 2014/68/EU |
GNEE warehouse aisle lined with bundled P355NH pressure vessel steel plates
Non‑standard dimensions, tighter tolerances, and simulated post‑weld heat treatment (PWHT) testing can all be arranged. Send your specifications and quantity, and we will return a detailed offer within hours.
Conclusion – Secure Your P355NH Steel for Boilers and Pressure Vessels Now
Every day your project waits for materials, costs rise. 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 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 the difference between P355GH and P355NH?
P355GH steel is used worldwide by fabricators of welded pressure vessels, industrial boilers and heat exchangers and is engineered to work well in elevated temperature service. P355NH steel is normalized weldable fine grain steel flats under EN 10028-3: 2009 standard.
What is the ASME material equivalent to P355NL1?
What is the asme material equivalent to P355NL1? ASME material equivalent to EN 10028-3 P355NL1 is ASME SA516 Grade 70.
What is P355N material?
P355N steel grade is one of grade in En10028-3, which is non alloy and alloy steels with specified elevated temperature properties. P355N grades are used above all for manufacturing boilers, pressure vessels and pipes transporting hot liquids.
What is P355GH material?
Steel for heat-resistant pressure vessels. P355GH steel gives optimum performance for pressurised products that must support a creep limit greater than 180N/mm2 at 400ºC. These types of steel are characterised by good weldability.
What is the difference between p355 and S355?
P355GH: Has a minimum yield strength of 355 MPa and is optimized for high-temperature environments in pressure vessels, but has lower toughness in cold conditions. S355J2: Also has a yield strength of 355 MPa but is optimized for structural applications requiring impact toughness.
