EN 10028:3 P355NL1 and P355NL2

Brown McFarlane carries a large range of pressure vessel plate stock certified to both EN 10028:3 P355NL1 and EN 10028:3 P355NL2

EN 10028:3

Plates to EN 10028:3 are widely specified in the manufacturing of pressure vessels throughout Europe and the standard is regularly seen in other parts of the world where equipment has been originally designed by a European company. For these reasons, and in terms of enquiries received by Brown McFarlane Group companies, it is probably the most popular pressure specification after the American standard ASME / ASTM SA/A516.

The specification EN 10028:3 covers a range of weldable fine grain steels supplied in the normalised condition and intended for pressure purposes. It has three steel grades (P275, P355, and P460) which indicate each grade’s minimum yield strength (in MPa) for plates 16 mm thick and below. These are further subdivided on the basis of impact testing (transverse) temperature: N and NH indicate impact testing at -20 deg C or above, NL1 at -40 deg C or above, and NL2 at -50 deg C or above.

The designation EN 10028:3 P355NL1 shows that this is steel for pressure purposes (P) with minimum yield strength of 355 MPa (355) which is impact tested in the transverse direction at -40 deg C (NL1). EN 10028:3 P355NL2 follows the same pattern but is impact tested at -50 deg C.

P355NL1 and P355NL2 compared

The differences between P355NL1 and P355NL2 can be seen in the tables below but are summarised as follows:

Chemistry: P355NL2 has a more tightly controlled Phosphorus and Sulphur content

Mechanical Properties: P355NL2 has higher required impact values at all specified temperatures and in both longitudinal and transverse directions. It also specifies requirements for transverse impact testing at -50 deg C

As well as P355NL1 and P355NL2, we are also stockists of plates manufactured and certified to:

EN 10028:3 P355NH         EN 10028:3 P275NH        EN 10028 P460NH

EN 10028:3 P460NL1        EN 10028:3 P460NL2

Chemical Requirements

(cast analysis, % by mass, maximum permitted unless indicated otherwise)

Grade  C Si  Mn  Altotal   N Cr 
P355NL1 0.18  0.50 1.10-1.70  0.025 0.008 0.020 min 0.012  0.30 
P355NL2  0.18  0.50  1.10-1.70  0.020 0.005 0.020 min 0.012  0.30 
Grade  Cu  Mo  Nb  Ni  Ti  Nb+Ti+V   
P355NL1  0.30  0.08  0.05  0.50  0.03  0.10  0.12   
P355NL2 0.30  0.08  0.05  0.50  0.03  0.10  0.12   

Tensile Requirements

Product Thickness

Yield Strength MPa

Tensile Strength MPa  Elongation A%
up to 16 mm 355 min  490 to 630 22 min 
16 to 40 mm 345 min  490 to 630 22 min
over 40 to 60 mm 335 min  490 to 630 22 min
over 60 to 100 mm 315 min  470 to 610 21 min
over 100 to 150 mm 305 min  460 to 600 21 min
over 150 to 250 mm 295 min  450 to 590 21 min

Impact energy values for the normalised condition

a) transverse

Steel Grade  -50 o -40 oC -20 oC oC +20 oC
P355NL1  - 27 J min 35 J min  50 J min  60 J min 
P355NL2  27 J min 30 J min  40 J min  60 J min  70 J min 

b) longitudinal

 Steel Grade  -50oC  -40oC  -20oC 0 o  +20oC
 P355NL1 30 J min  40 J min  50 J min  70 J min  80 J min 
 P355NL2 42 J min 45 J min  55 J min  75 J min  85 J min 

Comparable steel specifications

Although it is not uncommon to see this on steel company web sites, any suggestion that one steel specification and grade is an equivalent to another should be treated with caution especially because of differences in the methodology and techniques used for testing. However EN 10028:3 P355NL2 is broadly similar to the following steel specifications:

ASME SA516 Gr. 70          BS 1501 224 490B LT50

Plates certified to these standards are held in stock by Brown McFarlane.

For more information please contact our sales teams. Click here to go to the page giving contact details.


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