EN10028 P355NH steel plate is a normalized fine-grain pressure vessel steel designed for boilers, storage tanks, and equipment handling pressurized gases and hot liquids.
EN10028 P355NH steel plate
With excellent weldability and high resistance to brittle cracking, P355NH pressure vessel steel is widely used in industries such as oil & gas, petrochemical, and power generation.
As a professional steel supplier, we provide high-quality P355NH steel plates and sheets with stable performance, strict quality control, and flexible supply solutions.
What is P355NH Steel?
P355NH is a non-alloy steel under the EN 10028-3 standard, specifically developed for pressure vessel applications. The designation "P" stands for pressure purposes, while "355" indicates a minimum yield strength of 355 MPa.
This steel grade is supplied in the normalized condition (N), which ensures a fine-grain structure, improved toughness, and consistent mechanical properties. It is particularly suitable for applications requiring both strength and resistance to brittle fracture.
Chemical Composition of P355NH Steel
The chemical composition of P355NH steel plate is carefully controlled to ensure weldability, strength, and durability.
| Element | Max (%) | Element | Max (%) |
|---|---|---|---|
| C | ≤ 0.20 | Cu | ≤ 0.30 |
| Si | ≤ 0.50 | Mo | ≤ 0.08 |
| Mn | 0.90 – 1.70 | N | ≤ 0.02 |
| P | ≤ 0.03 | Nb | ≤ 0.05 |
| S | ≤ 0.03 | Ni | ≤ 0.50 |
| Al | ≥ 0.020 | Ti | ≤ 0.03 |
| Cr | ≤ 0.30 | V | ≤ 0.10 |
| Nb+Ti+V | ≤ 0.12 |
The controlled levels of carbon and alloying elements improve weldability and reduce the risk of cracking, especially in pressure applications.
Mechanical Properties of P355NH Steel Plate
P355NH steel provides reliable strength across a range of thicknesses:
| Thickness (mm) | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) |
|---|---|---|---|
| ≤16 | ≥355 | 490 – 630 | ≥22 |
| 16–35 | ≥355 | 490 – 630 | ≥22 |
| 35–50 | ≥345 | 490 – 630 | ≥22 |
| 50–70 | ≥325 | 490 – 630 | ≥22 |
| 70–100 | ≥315 | 470 – 610 | ≥21 |
| 100–150 | ≥295 | 450 – 590 | ≥21 |
Impact Properties of P355NH Steel
P355NH steel is designed with excellent impact toughness:
-20°C: ≥ 40 J
0°C: ≥ 47 J
+20°C: ≥ 55 J
This ensures high resistance to brittle fracture, especially in low-temperature environments.
Key Features of P355NH Steel Plate
One of the main advantages of P355NH pressure vessel steel is its excellent weldability, which allows efficient fabrication without compromising strength.
It also offers high resistance to brittle cracking, making it suitable for critical applications involving pressurized gases. The normalized condition ensures a fine-grain structure, improving both toughness and long-term reliability.
Applications of P355NH Steel
Due to its excellent properties, P355NH steel plate is widely used in:
- Pressure vessels and storage tanks
- Boilers and heat exchangers
- Oil and gas processing equipment
- Petrochemical plants
- Pipelines for hot liquids and gases
Its reliability makes it a preferred choice for global fabrication projects.
We provide a wide range of P355NH steel plates and sheets, including:
- Various thicknesses and dimensions
- Stock availability for fast delivery
- Third-party inspection (SGS, BV, etc.)
- Custom cutting and processing
We also supply related grades such as P355N, P355NL1, and P355NL2 to meet different project requirements.
EN10028 P355NH steel plate is a high-performance pressure vessel material with excellent weldability, strong mechanical properties, and superior resistance to brittle fracture. It is widely used in critical industries requiring safety and durability.
As a professional P355NH steel supplier, we offer competitive pricing, large stock availability, and reliable delivery. Contact us today to get the latest price and technical support for your project.
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What is P355NH material?
P355NH steel is characterised by good weldability and high resistance to brittle cracking.
What is the difference between p355 and S355 steel?
Mechanical Properties: 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.
What is the difference between S355H and s355nh?
Purpose: Similar to S355H, it is used for structural hollow sections, but the "N" indicates that the steel is normalized or normalized rolled, which improves its toughness and weldability by refining the grain structure.
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.