what is p355nh equivalent?
P355NH (EN 1.0565) is a European steel for pressure vessels, with key equivalents being ASTM A662 Grade C (USA), WStE355 (German DIN), and A510AP (French AFNOR). It's a fine-grain, normalized steel with a minimum yield strength of 355 MPa, suitable for elevated temperatures, offering good weldability and resistance to brittle cracking, often used in tanks for pressurized gases.
P355NH is the most versatile and widely stocked "high-spec" pressure vessel steel in the EN 10028 series. it represents a "safe" procurement choice because it meets the requirements for a wide range of operating temperatures, often allowing one grade to be used for multiple parts of a project.
Decoding the Name:
P: Standard prefix for pressure-rated components.
355: Baseline yield strength ($355$ MPa), which is the standard for mid-to-high pressure designs.
N: Indicates it has undergone furnace normalizing, making it stable for further heat treatment (like stress relieving).
H: Ensures the material is "future-proofed" for applications involving heat.
Key Comparison:
In global procurement, P355NH is the European equivalent to ASME SA537 Class 1. While SA537 is the American standard, P355NH is often preferred for international projects in the Middle East and SE Asia because it aligns with Eurocode engineering software and metric piping standards.
Key Characteristics:
Multi-Certification: Many suppliers stock plates that are triple-certified (e.g., meeting P355N, P355NH, and P355NL1 simultaneously).
Cost-Efficiency: Offers a high strength-to-price ratio compared to stainless or high-alloy steels.
Availability: Being a standard grade, it is available in a wide range of thicknesses (from 6mm to 150mm+).
Common Applications:
Storage spheres for LNG/LPG, district heating boilers, desalination plant vessels, and large-scale industrial autoclaves.
What is the hardness of P355NH?
P355NH steel, used for pressure vessels, doesn't have a single hardness number but is characterized by a minimum yield strength of 355 MPa, with typical tensile strength ranging from 490 to 630 MPa, and often supplied in a normalized condition for good toughness, though hardness values like Brinell can vary by supplier and processing, generally falling in a soft-to-medium range suitable for welding and low-temperature service, often around 170-200 HB.
What is the effective use of P355NH?
P355NH is a high-strength, normalized pressure vessel steel (EN 10028-3) effective for manufacturing boilers, pressure tanks, heat exchangers, and pipelines, especially in the oil & gas, chemical, and energy industries, due to its excellent weldability, toughness, and suitability for operating at elevated temperatures (up to around 400°C) and in low-temperature (cryogenic) conditions. Its "NH" designation means it's normalized for specified elevated-temperature properties, making it ideal for storing pressurized gases like LNG/LPG and for heavy-duty structural applications.
What is P355NH material?
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.
Equivalent grades of steel P355NH (1.0565)
| EU | USA | Germany | France | England | Italy |
| EN | – | DIN,WNr | AFNOR | BS | UNI |
| P355NH | A662Gr.C | WStE355 | A510AP | 224Gr.490 | FeE355-2 |
Chemical composition % of steel P355NH (1.0565): EN 10028-3-2009
| C | Si | Mn | Ni | P | S | Cr | Mo |
| max 0.18 | max 0.5 | 1.1 – 1.7 | max 0.5 | max 0.025 | max 0.015 | max 0.3 | max 0.08 |
Mechanical properties of steel P355NH (1.0565)
| Nominal thickness (mm): | to 60 | 60 – 100 | 100 – 150 | 150 – 250 |
| Rm – Tensile strength (MPa) (+N) | 490-630 | 470-610 | 460-600 | 450-590 |
| KV – Impact energy (J) transverse, (+N) | -20° | 0° | +20° | |
| 27-30 | 35-40 | 39-50 | ||
| KV – Impact energy (J) longitud., | -20° | 0° | +20° | |
| 40-45 | 47-65 | 55-75 | ||
1What is the yield strength of P355NH?
The yield strength of P355NH steel is typically a minimum of 355 MPa (N/mm²), but it varies by thickness, with thinner sections sometimes having higher yield strengths (e.g., ≥355 MPa for thicker plates) and thicker sections showing lower minimums (e.g., ≥295 MPa for very thick plates >150mm) as per EN 10028-3 standards, being a normalized fine-grain steel for pressure vessels.
2what is p355nh equivalent?
P355NH (EN 1.0565) is a European steel for pressure vessels, with key equivalents being ASTM A662 Grade C (USA), WStE355 (German DIN), and A510AP (French AFNOR). It's a fine-grain, normalized steel with a minimum yield strength of 355 MPa, suitable for elevated temperatures, offering good weldability and resistance to brittle cracking, often used in tanks for pressurized gases.
3What are the advantages of P355NH?
P355NH steel offers advantages like high strength at elevated temperatures, excellent weldability, and good resistance to brittle fracture, making it ideal for pressure vessels, boilers, and gas tanks, especially for storing pressurized gases like propane or butane in environments up to about 400°C. Its normalized, fine-grained structure provides superior cold and hot formability, ensuring structural integrity under demanding conditions.
4What is the temperature range of P355NH?
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.
5What is P355NH mean?
P355NH is a European standard (EN 10028) fine-grain, weldable steel for pressure vessels, where 'P' means Pressure, '355' indicates a minimum yield strength of 355 MPa, and 'NH' signifies it's normalized for elevated temperature applications, offering good strength and low-temperature toughness, commonly used in tanks for pressurized gases and boilers.
6What is P355NH material grade?
P355NH is a normalized, fine-grain, weldable steel grade (according to EN 10028-3) designed for pressure vessels and boilers, offering good high-temperature strength and resistance to brittle cracking, with 'H' indicating its suitability for elevated temperatures, 'N' for normalized, and 'P355' for its minimum yield strength (355 MPa). It's used for components like pressurized gas tanks, steam boilers, and piping, and has variants like P355NL1/NL2 for low-temperature service.
7What is P355NH steel Plate Thickness?
P355NH steel plates come in a wide range of thicknesses, commonly from 6mm up to 250mm or even 350mm, depending on the supplier and specific application, used for boilers and pressure vessels, with the thickness affecting mechanical properties like yield strength, as specified by the EN 10028-3 standard.
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