Carbon ASTM P355NH Pressure Vessel Steel Plate/ Sheet

P355NH

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 pressurized 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 normalized 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.

 

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

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.

 

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

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 our sales team.)

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