Material number 1.2379: 1.2379
1.2379 is the European material number (Werkstoffnummer, EN 10027-2) for 1.2379, cold-work tool steel, 12 % Cr ledeburitic specified in EN ISO 4957.
Reading 1.2379 digit by digit
An EN 10027-2 number has the form 1.XXYY. The leading 1 marks it as steel. The pair 23 is the steel group, and for this number that group is Cr-Mo-V cold-work tool steels. The final pair 79 is a sequential count inside that group and carries no meaning of its own — 1.2379 is simply the 79th entry registered there.
The group digits are the useful part. Reading 23 tells you what kind of steel you are looking at before you know anything else about it, and this is the only number from group 23 held here so far.
1.2379 identity card
| Item | Value |
|---|---|
| Material number (EN 10027-2) | 1.2379 |
| Symbolic grade name | 1.2379 |
| Steel group | 23 — Cr-Mo-V cold-work tool steels |
| Sequential number in group | 79 |
| Specified in | EN ISO 4957 |
| Steel family | Tool steel |
| Tensile, same condition | ≈ 750–850 (typ.) MPa |
| Cross-references held | 8 grades in 6 systems |
1.2379 (X153CrMoV12) is the 12 % Cr / 1.5 % C cold-work tool steel — the European D2. Hardens to 58–62 HRC, high wear resistance, dimensionally stable. Composition, heat treatment, hardness and D2/SKD11/Cr12MoV equivalents.
Full data sheet for 1.2379 → · Equivalent grades → · EN ISO 4957 →