P355NH Pressure Vessel Steel

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
  • P355 NH NL2 – is ideal for use in especially low temperatures

P355NH is a normalised steel grade with a minimum yield strength of 275-460 N/mm² and plates are available ex–stock from our warehouse.

The technical specifications are outlined in the data tables below.

EN 10028 P355 NH, P355 NL1 and P355 NL2 - Chemical Composition

The chemical composition of EN 10028 P355 NH, P355 NL1 and P355 NL2 is given in the table below.

Table 1: Chemical Composition of EN 10028 P355 NH, P355 NL1 & P355 NL2

Element

P355NH

P355NL1

P355NL2

Element

P355NH

P355NL1

P355NL2

Carbon (C)
max.

0.18

0.18

0.18

Silicon (Si)
max.

0.50

0.50

0.50

Manganese (Mn)

1.10 to 1.70

1.10 to 1.70

1.10 to 1.70

Phosphorous (P)
max.

0.025

0.025

0.020

Sulphur (S)
max.

0.015

0.015

0.010

Chromium (Cr)
min.

0.30

0.30

0.30

Molybdenum (Mo)
max.

0.08

0.08

0.08

Nickel (Ni)
max.

0.50

0.50

0.50

Niobium (Nb)
max.

0.05

0.05

0.05

Titanium (Ti)
max.

0.03

0.03

0.03

Vanadium (V)
max.

0.10

0.10

0.10

Nitrogen (N)
max.

0.012

0.012

0.012

Aluminium (Al)
max.

0.020

0.020

0.020

Copper (Cu)
max.

0.30

0.30

0.30

Chemical element composition is % by mass.
The combined quantities of Niobium, Titanium and Vanadium should be 0.12% max.

EN 10028 P355 NH, P355 NL1 and P355 NL2 - Mechanical Properties

The mechanical properties of EN 10028 P355 NH, P355 NL1 and P355 NL2 are given in the table below.

Table 2: Mechanical Properties of EN 10028 P355 NH, P355 NL1 and P355 NL2

Grade

Type

Thickness
(mm)

Yield Strength
MPa (min)

Tensile Strength
MPa

Elongation
% (min
)

P355 NH

Normalized

≤16

355

490 to 630

21

P355 NL1

16> to ≤40

345

490 to 630

21

P355 NL2

 

40> to ≤60

335

490 to 630

21

60> to ≤100

315

470 to 610

21

100> to ≤150

305

460 to 600

21

150> to ≤250

295

450 to 590

21

(Please note: the technical information above is for guidance only – for exact specifications please check with Masteel)

This information has been sourced, reviewed and adapted from materials provided by Masteel UK Ltd.

For more information on this source, please visit Masteel UK Ltd.

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Comments

  1. Pandhari Sanap Pandhari Sanap India says:

    Dear Sir,

    Please let me P355NH equivalent in ASME standard.

    Thanking you in anticipation,
    Pandharinath Sanap.

    • Abhay Mehta Abhay Mehta India says:

      mostly is should be SA 516 gr.60 & 70

The opinions expressed here are the views of the writer and do not necessarily reflect the views and opinions of AZoM.com.

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