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Pressure Vessel Plate EN 10028:3 P355NL1 and P355NL2
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EN 10028:3
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 | P | S | Altotal | N | Cr | ||
| P355NL1 | 0.18 | 0.5 | 1.10-1.70 | 0.025 | 0.008 | 0.020 min | 0.012 | 0.3 | ||
| P355NL2 | 0.18 | 0.5 | 1.10-1.70 | 0.02 | 0.005 | 0.020 min | 0.012 | 0.3 | ||
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