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