EN10028-3 standard covers a range of weldable fine grain steels supplied in the normalized condition and intended for pressure purposes. EN10028-3 pressure vessel steel plates have three steel grade levels: P275, P355, and P460. The leters indicate each grade’s minimum yield strength (in MPa) for plates 16 mm thick and below. Those grade levels 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.
EN10028-3 pressure vessel steel plates chemical composition:
| EN10028-3 | Chemical elements,% | |||||||||||||||
| Grade | No. | C max. | Si max. | Mn | P max. | S max. | Al (toal) min. | N max. | Cr max. | Cu max. | Mo max. | Nb max. | Ni max. | Ti max. | V max. | Nb+Ti+ V max. |
| P275NH | 1.0487 | 0.16 | 0.40 | 0.80 b ~ 1.50 |
0.025 | 0.015 | 0.020 c, d |
0.012 | e 0.30 |
e 0.30 |
e 0.08 |
0.05 | 0.50 | 0.03 | 0.05 | 0.05 |
| P275NL1 | 1.0488 | |||||||||||||||
| P275NL2 | 1.1104 | 0.020 | 0.010 | |||||||||||||
| P355N | 1.0562 | 0.18 | 0.50 | 1.10 ~ 1.70 | 0.025 | 0.015 | 0.020 c, d |
0.012 | e 0.30 |
e 0.30 |
e 0.08 |
0.05 | 0.50 | 0.03 | 0.10 | 0.12 |
| P355NH | 1.0565 | |||||||||||||||
| P355NL1 | 1.0566 | |||||||||||||||
| P355NL2 | 1.1106 | 0.02 0 | 0.01 0 | |||||||||||||
| P460NH | 1.8935 | 0.20 | 0.60 | 1.10 ~ 1.70 |
0.025 | 0.015 | 0.020 c, d |
0.025 | 0.30 | f 0.70 |
0.10 | 0.05 | 0.80 | 0.03 | 0.20 | 0.22 |
| P460NL1 | 1.8915 | |||||||||||||||
| P460NL2 | 1.8918 | 0.020 | 0.010 | |||||||||||||
EN10028-3 pressure vessel steel plates mechanical property:
| EN10028-3 | Thickness,mm | Yield strength ReH MPa min. |
Tensile strength Rm MPa | Elongation A,%min. |
|
| Grade | No. | ||||
| P275NH P275NL1 P275NL2 | 1.0487 1.0488 1.1104 |
≤16 | 275 | 390~510 | 24 |
| 16<t≤40 | 265 | ||||
| 40<t≤60 | 255 | ||||
| 60<t≤100 | 235 | 370~490 | 23 | ||
| 100<t≤150 | 225 | 360~480 | |||
| 150<t≤250 | 215 | 350~470 | |||
| P355N P355NH P355NL1 P355NL2 | 1.0562 1.0565 1.0566 1.1106 |
≤16 | 355 | 490~630 | 22 |
| 16<t≤40 | 345 | ||||
| 40<t≤60 | 335 | ||||
| 60<t≤100 | 315 | 470~610 | 21 | ||
| 100<t≤150 | 305 | 460~600 | |||
| 150<t≤250 | 295 | 450~590 | |||
| P460NH P460NL1 P460NL2 | 1.8935 1.8915 1.8918 |
≤16 | 460 | d 570~720 |
17 |
| 16<t≤40 | 445 | ||||
| 40<t≤60 | 430 | ||||
| 60<t≤100 | 400 | 540~710 | |||
| 100<t≤250 | C | C | C | ||
EN10028-3 pressure vessel steel plates impact test:
| Grade | Thickness, mm | The impact energy min. value, KV, J at the following test temperatures (℃) | |||||||||
| Transverse | Longitudinalb | ||||||||||
| -50 | -40 | -20 | 0 | +20 | -50 | -40 | -20 | 0 | +20 | ||
| P…N P…NH |
c 5 ~ 250 d |
— | — | 30 | 40 | 50 | — | — | 45 | 65 | 75 |
| P…N L1 | — | 27 | 35 | 50 | 60 | 30 | 40 | 50 | 70 | 80 | |
| P…N L2 | 27 | 30 | 40 | 60 | 70 | 42 | 45 | 55 | 75 | 85 | |
EN10028-3 pressure vessel steel plates 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. EN10028-3 pressure vessel steel plates cover a range of weldable fine grain steels supplied in the normalised condition and intended for pressure purposes.
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