P355NH pressure vessel steel sheets comply with EN 10028-3 and are designed for pressure equipment operating under demanding conditions. This steel grade combines high mechanical strength, excellent weldability and reliable performance at elevated operating temperatures. These characteristics make it suitable for pressure vessels, boilers, storage tanks, heat exchangers and equipment used in the energy, chemical and petrochemical industries. The NH quality ensures consistent mechanical properties and dependable long-term service.
Sidastico supplies cut-to-size steel sheets in a wide range of thicknesses and dimensions. The company cuts every sheet according to customer specifications, reducing material waste and improving manufacturing efficiency. Sidastico also provides the EN 10204 3.1 inspection certificate with every delivery, ensuring full traceability and compliance with the declared mechanical and chemical properties.
P355NH pressure vessel steel sheets are suitable for laser cutting, plasma cutting, oxy-fuel cutting, bending, drilling and welding. Manufacturers use this grade for pressure vessels, storage tanks, piping systems, industrial equipment and components operating under pressure. Its balanced mechanical properties ensure long service life, reliable performance and high operational safety.
Compared with standard pressure vessel steels, this material provides an excellent combination of strength, weldability and durability. It is therefore a preferred solution for pressure equipment requiring certified quality and dependable performance.
Sidastico combines extensive stock availability with precision cut-to-size processing, certified quality and reliable deliveries. Customers benefit from steel sheets designed for pressure equipment and supported by fast, dependable service.
Standard
EN10028-3
Identification Number
1.0565
Classification
–
Type
–
Rolling State
Normalised
Brief Description
Fine-grain structural steel for pressure vessels.
Good weldability and good cold and hot-rolling properties under normalised conditions.
Applications
Fine-grain, high-resistance structural steel for pressure vessels.
Standard Coil Stock Range
| P355NH | 1500 | 2000 |
|---|---|---|
| 3 | ● | |
| 4 | ● | |
| 5 | ● | ● |
| 6 | ● | ● |
| 8 | ● | ● |
| 10 | ● | ● |
| 12 | ● | ● |
| 15 | ● |
Chemical Composition
Regulatory standard
| Element | Value |
| C (%) | ≤ 0,18 |
| Si (%) | ≤ 0,50 |
| Mn (%) | 1,10-1,70 |
| P (%) | ≤ 0,025 |
| S (%) | ≤ 0,010 |
| AI (%) | ≥ 0,020 |
| Nb (%) | ≤ 0,05 |
| Ti (%) | ≤ 0,03 |
| V (%) | ≤ 0,10 |
| Mo (%) | ≤ 0,08 |
| Cu (%) | ≤ 0,30 |
| Element | Value |
| Cr (%) | ≤ 0,30 |
| Ni (%) | ≤ 0,50 |
| N (%) | ≤ 0,012 |
| B (%) | |
| Nb+Ti+V (%) | ≤ 0,12 |
| Cr+Mo+Ni (%) | |
| Ni+Cr+Cu+Mo (%) | |
| C.E.V. (%) | ≤ 0,43* |
* = for thicknesses in mm ≤ 60
C.E.V. (%) = C+(Mn/6)+[(Cr+Mo+V)/5]+[(Ni+Cu)/15]
Mechanical Properties
According to UNI EN 10028
| Mechanical characteristics | Direction | Thicknesses | Values |
| Re (MPa) | T | ≤ 16 | ≥ 355 |
| T | > 16 ≤ 40 | ≥ 345 | |
| Rm(MPa) | T | ≤ 16 | 490-630 |
| T | > 16 ≤ 40 | 490-630 | |
| A80 (%) | T | ≥ 16 | |
| A5 (%) | T | ≥ 22 | |
| Bend Test 180° | |||
| KV 20°C (J) | L | ≤ 250 | ≥ 75* |
| T | ≤ 250 | ≥ 50* | |
| KV 0°C (J) | L | ≤ 250 | ≥ 65* |
| T | ≤ 250 | ≥ 40* | |
| KV -20°C (J) | L | ≤ 250 | ≥ 45* |
| T | ≤ 250 | ≥ 30* | |
| KV -40°C (J) | |||
| KV -50°C (J) |
* = Standard option
t = thickness in mm of the test tube for the bend test
L = Tensile testing carried out on longitudinal test pieces
T = Bend tests carried out on cross-cut test pieces
Tolerances
Tolerances on the dimensions and on the shape UNI EN 10051
Surface condition UNI EN 10163-2
Certifications
EN 10204-3.1
DISCLAIMER: SIDASTICO S.p.A. declines any and all liability for the accuracy and precision of the information herein and reserves the right to modify any part without advanced notice.
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Via Astico, 44
36030 Fara Vic.no (VI) – IT
Tel. +39 0445/869500
info@sidastico.com
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