Material number 1.8159: 51CrV4
1.8159 is the European material number (Werkstoffnummer, EN 10027-2) for 51CrV4, chromium-vanadium spring steel, quenched and tempered specified in EN 10089.
Reading 1.8159 digit by digit
An EN 10027-2 number has the form 1.XXYY. The leading 1 marks it as steel. The pair 81 is the steel group, and for this number that group is Cr-Si-Mo-V steels. The final pair 59 is a sequential count inside that group and carries no meaning of its own — 1.8159 is simply the 59th entry registered there.
The group digits are the useful part. Reading 81 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 81 held here so far.
1.8159 identity card
| Item | Value |
|---|---|
| Material number (EN 10027-2) | 1.8159 |
| Symbolic grade name | 51CrV4 |
| Steel group | 81 — Cr-Si-Mo-V steels |
| Sequential number in group | 59 |
| Specified in | EN 10089 |
| Steel family | Spring steel |
| Also carries UNS | G61500 |
| Tensile, same condition | ≤ 850 MPa |
| Cross-references held | 9 grades in 6 systems |
51CrV4 (1.8159) is the chromium-vanadium spring steel of EN 10089: 1350–1650 MPa tensile at 42–48 HRC, hardening through heavy sections. Composition, heat treatment and 6150/SUP10 equivalents.
Full data sheet for 51CrV4 → · Equivalent grades → · EN 10089 →