Material number 1.2344: 1.2344
1.2344 is the European material number (Werkstoffnummer, EN 10027-2) for 1.2344, hot-work tool steel, 5 % Cr secondary-hardening specified in EN ISO 4957.
Reading 1.2344 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 44 is a sequential count inside that group and carries no meaning of its own — 1.2344 is simply the 44th 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 the 3 other numbers from group 23 held here are listed below.
1.2344 identity card
| Item | Value |
|---|---|
| Material number (EN 10027-2) | 1.2344 |
| Symbolic grade name | 1.2344 |
| Steel group | 23 — Cr-Mo-V cold-work tool steels |
| Sequential number in group | 44 |
| Specified in | EN ISO 4957 |
| Steel family | Tool steel |
| Also carries UNS | T20813 |
| Tensile, same condition | ≈ 760–850 (typ.) MPa |
| Cross-references held | 8 grades in 5 systems |
1.2344 (X40CrMoV5-1) is the 5 % Cr hot-work tool steel known as H13: working hardness 44–52 HRC, tempered above its service temperature. Composition, heat treatment, and H13/SKD61/4Cr5MoSiV1 equivalents.
Full data sheet for 1.2344 → · Equivalent grades → · EN ISO 4957 →
Group 23 — the neighbouring numbers
Same group digits, so the same broad class of steel. The sequential digits do not rank them.