Material number 1.0565: P355NH
1.0565 is the European material number (Werkstoffnummer, EN 10027-2) for P355NH, weldable fine-grain normalized steel for pressure purposes, elevated temperature specified in EN 10028-3.
Reading 1.0565 digit by digit
An EN 10027-2 number has the form 1.XXYY. The leading 1 marks it as steel. The pair 05 is the steel group, and for this number that group is steels 0.25–0.55 % C or Rm 500–700 MPa. The final pair 65 is a sequential count inside that group and carries no meaning of its own — 1.0565 is simply the 65th entry registered there.
The group digits are the useful part. Reading 05 tells you what kind of steel you are looking at before you know anything else about it, and the 5 other numbers from group 05 held here are listed below.
1.0565 identity card
| Item | Value |
|---|---|
| Material number (EN 10027-2) | 1.0565 |
| Symbolic grade name | P355NH |
| Steel group | 05 — steels 0.25–0.55 % C or Rm 500–700 MPa |
| Sequential number in group | 65 |
| Specified in | EN 10028-3 |
| Steel family | Pressure vessel steel |
| Yield, first condition in the table | 355 MPa (≤ 16 mm, +N) |
| Tensile, same condition | 490–630 MPa |
| Cross-references held | 10 grades in 6 systems |
P355NH (1.0565, ex WStE355) is the EN 10028-3 normalized fine-grain pressure-vessel steel: 355 MPa yield, 490–630 MPa tensile, Rp0.2 to 400 °C, 27 J at −20 °C. Data, N/NH/NL1/NL2 family, A516-70/SA-516 equivalents.
Full data sheet for P355NH → · Equivalent grades → · EN 10028-3 →
Group 05 — the neighbouring numbers
| Material number | Grade | Type |
|---|---|---|
| 1.0503 | C45 | Medium-carbon steel for quenching and tempering |
| 1.0529 | S350GD | Hot-dip coated structural steel, guaranteed 350 MPa yield — deck and long-span profiles |
| 1.0570 | St52-3 | General structural steel (DIN 17100, withdrawn) — today S355J2 / S355JR |
| 1.0576 | S355J2H | Non-alloy structural steel for hollow sections, 355 MPa, −20 °C impact |
| 1.0577 | S355J2 | Non-alloy hot-rolled structural steel, −20 °C impact |
Same group digits, so the same broad class of steel. The sequential digits do not rank them.