EN 10028-2 — Flat products made of steels for pressure purposes. Part 2: Non-alloy and alloy steels with specified elevated temperature properties
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Scope
Plate, sheet and strip for boilers and pressure vessels: non-alloy P235GH, P265GH, P295GH, P355GH and alloy 16Mo3, 13CrMo4-5, 10CrMo9-10, 11CrMo9-10, 12CrMo9-10, X12CrMo5, 13CrMoSi5-5, X10CrMoVNb9-1, X20CrMoV11-1. Chemistry, room- and elevated-temperature yield to 500–600 °C, impact at −20/0/+20 °C, creep data (informative), delivery conditions (+N, +NT, +QT).
Grades covered by EN 10028-2
| Grade | No. | Type | C % | Yield MPa | Tensile MPa | Nearest equivalents |
|---|---|---|---|---|---|---|
| 16Mo3 | 1.5415 | Molybdenum-alloyed steel for pressure purposes at elevated temperature | 0.12 – 0.2 | 275 | 440–590 | A204 Gr. A, A204 Gr. B, A335 P1 |
| P235GH | 1.0345 | Non-alloy steel for pressure purposes with elevated-temperature properties | ≤ 0.16 | 235 | 360–480 | p265gh, a516-70, s235jr |
| P265GH | 1.0425 | Non-alloy steel for pressure purposes with elevated-temperature properties | ≤ 0.2 | 265 | 410–530 | A516 Gr. 60, A516 Gr. 65, A285 Gr. C |
| P355GH | 1.0473 | Non-alloy steel for pressure purposes with elevated-temperature properties | ≤ 0.22 | 355 | 490–630 | A516 Gr. 70, A537 Cl. 1, SPV355 |
Revision history and superseded standards
| Year | Change |
|---|---|
| 1992 | EN 10028-2:1992 — replaced DIN 17155 and BS 1501 |
| 2003 | Revision; alignment with PED |
| 2009 | Revision; 9–12 % Cr grades |
| 2017 | EN 10028-2:2017 — current |
Supersedes: DIN 17155:1983 (HI, HII, 17Mn4, 19Mn6, 15Mo3, 13CrMo44, 10CrMo910); BS 1501-1/-2; EN 10028-2:1992 / 2003 / 2009.
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The full text is copyrighted by CEN and is not reproduced here. Purchase the current edition from CEN or your national standards body. The values on this site are the normative limits as published; the standard's own tables, notes and test methods govern.
Related standards
P is not S, and the difference is temperature
The prefix decides which standard a plate belongs to. S is a structural steel under EN 10025 and its properties are guaranteed at room temperature. P is a pressure-purpose steel under EN 10028, and what it adds is a table of proof strength at elevated temperature — 0.2 % proof stress tabulated at 50 °C intervals from 100 °C upward.
That table is the reason the family exists. A pressure vessel designed to 300 °C is calculated on the strength the steel actually has at 300 °C, not on its room-temperature figure, and only the P grades publish it. Substituting S355J2 for P355GH because the numbers look similar removes the entire basis of the design calculation, and there is no grade called S355GH — the two naming systems have been crossed.
What Part 2 covers and where the neighbours are
EN 10028-2 holds the non-alloy and alloy steels with specified elevated-temperature properties: P235GH, P265GH, P295GH, P355GH and the molybdenum and chromium-molybdenum grades 16Mo3, 13CrMo4-5 and 10CrMo9-10. The GH suffix marks the elevated-temperature duty.
The other parts serve different duties. Part 3 is normalised weldable fine-grain steel for low temperature — P275NH through P460NH. Part 4 is the nickel-alloy steels for cryogenic service. Part 5 is thermomechanically rolled fine grain, part 6 quenched and tempered, part 7 stainless. A grade name alone does not say which part it comes from; the suffix does.
Testing, certification and why the order matters
Pressure plate carries obligations that structural plate does not. Impact testing is required rather than optional. Through-thickness (Z) quality to EN 10164 is ordered where the design puts tension across the plate, as at nozzle reinforcement and skirt attachments. Ultrasonic examination to EN 10160 is normal above about 40 mm. Simulated post-weld-heat-treatment test data is available on request where PWHT will be applied and the design depends on post-treatment properties.
All of these are specified before the plate is produced. A 3.2 certificate under EN 10204, with a third-party inspector present, cannot be added to a heat that has already been rolled — the inspection has to happen while the material is being made.
P grades publish 0.2 % proof stress at temperature; S grades do not.
Part 2 elevated temperature, part 3 low temperature, part 4 cryogenic.
Z-quality (EN 10164) and UT (EN 10160) are order-time decisions.
There is no S355GH — that name crosses two different systems.
faq.h
What is the difference between P265GH and S275JR?
P265GH is a pressure-vessel plate with published proof strength at elevated temperature and mandatory impact testing; S275JR is a structural steel guaranteed only at room temperature. Their room-temperature strengths are similar, which is exactly why the substitution is tempting and wrong.
Is there a grade called S355GH?
No. S belongs to the structural standard EN 10025 and GH to the pressure standard EN 10028. The grade being looked for is either S355J2 (structural) or P355GH (pressure) — they are different materials with different test regimes.
What does GH mean in P355GH?
It marks a steel for pressure purposes with specified elevated-temperature properties. P is the pressure family, 355 is the minimum yield in MPa for the thinnest band, and GH signals the elevated-temperature proof-stress table that the design calculation uses.
Which part of EN 10028 do I need?
Part 2 for elevated-temperature service in non-alloy and Mo/CrMo steels; part 3 for normalised fine-grain steels at low temperature; part 4 for nickel steels down to cryogenic; part 5 thermomechanically rolled; part 6 quenched and tempered; part 7 stainless. The grade suffix identifies the part.
Do I need Z-quality plate?
Where the weld detail puts tension through the thickness of the plate — nozzle reinforcement pads, skirt attachments, cruciform joints in heavy section. EN 10164 grades Z15, Z25 and Z35 by guaranteed through-thickness reduction of area, and it is ordered with the plate, not afterwards.