S355NHA 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. The specification EN 10028:3 covers a range of weldable fine grain steels supplied in the normalised condition and intended for pressure purposes.EN 10028:3 P355NH is steel for pressure purposes (P) with minimum yield strength of 355 MPa (355) which has specified elevated temperature properties (NH).

 

Chemical composition %   of grade   P355NH (1.0565)

According EN 10222-4 chemical composition:

Element
P355NH
P355NL1
P355NL2
Element
P355NH
P355NL1
P355NL2
Carbon (C)
0.18
0.18
0.18
Silicon (Si)
0.5
0.5
0.5
max.
max.
Manganese (Mn)
1.10 to 1.70
1.10 to 1.70
1.10 to 1.70
Phosphorous (P)
0.025
0.025
0.02
max.
Sulphur (S)
0.015
0.015
0.01
Chromium (Cr)
0.3
0.3
0.3
max.
min.
Molybdenum (Mo)
0.08
0.08
0.08
Nickel (Ni)
0.5
0.5
0.5
max.
max.
Niobium (Nb)
0.05
0.05
0.05
Titanium (Ti)
0.03
0.03
0.03
max.
max.
Vanadium (V)
0.1
0.1
0.1
Nitrogen (N)
0.012
0.012
0.012
max.
max.
Aluminium (Al)
0.02
0.02
0.02
Copper (Cu)
0.3
0.3
0.3
max.
max.


Mechanical properties of grade   P355NH (1.0565)

 

rade
Type
Thickness
Yield Strength
Tensile Strength
Elongation
(mm)
MPa (min)
MPa
% (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

 

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