Material number 1.0425: P265GH
1.0425 is the European material number (Werkstoffnummer, EN 10027-2) for P265GH, non-alloy steel for pressure purposes with elevated-temperature properties specified in EN 10028-2.
Reading 1.0425 digit by digit
An EN 10027-2 number has the form 1.XXYY. The leading 1 marks it as steel. The pair 04 is the steel group, and for this number that group is steels 0.12–0.25 % C or Rm 400–500 MPa. The final pair 25 is a sequential count inside that group and carries no meaning of its own — 1.0425 is simply the 25th entry registered there.
The group digits are the useful part. Reading 04 tells you what kind of steel you are looking at before you know anything else about it, and the 2 other numbers from group 04 held here are listed below.
1.0425 identity card
| Item | Value |
|---|---|
| Material number (EN 10027-2) | 1.0425 |
| Symbolic grade name | P265GH |
| Steel group | 04 — steels 0.12–0.25 % C or Rm 400–500 MPa |
| Sequential number in group | 25 |
| Specified in | EN 10028-2 |
| Steel family | Pressure vessel steel |
| Yield, first condition in the table | 265 MPa (≤ 16 mm, +N) |
| Tensile, same condition | 410–530 MPa |
| Cross-references held | 11 grades in 6 systems |
P265GH (1.0425, ex HII) is the EN 10028-2 pressure-vessel steel: 265 MPa yield, 410–530 MPa tensile, 27 J at −20 °C, Rp0.2 guaranteed to 400 °C. Composition, elevated-temperature table, A516-60/SA-516 equivalents.
Full data sheet for P265GH → · Equivalent grades → · EN 10028-2 →
Group 04 — the neighbouring numbers
Same group digits, so the same broad class of steel. The sequential digits do not rank them.