Material number 1.7176: 5160
1.7176 is the European material number (Werkstoffnummer, EN 10027-2) for 5160, chromium spring steel, quenched and tempered specified in ASTM A29.
Reading 1.7176 digit by digit
An EN 10027-2 number has the form 1.XXYY. The leading 1 marks it as steel. The pair 71 is the steel group, and for this number that group is Cr steels ≥ 1 % Cr. The final pair 76 is a sequential count inside that group and carries no meaning of its own — 1.7176 is simply the 76th entry registered there.
The group digits are the useful part. Reading 71 tells you what kind of steel you are looking at before you know anything else about it, and the 1 other number from group 71 held here are listed below.
1.7176 identity card
| Item | Value |
|---|---|
| Material number (EN 10027-2) | 1.7176 |
| Symbolic grade name | 5160 |
| Steel group | 71 — Cr steels ≥ 1 % Cr |
| Sequential number in group | 76 |
| Specified in | ASTM A29 |
| Steel family | Spring steel |
| Also carries UNS | G51600 |
| Tensile, same condition | ≈ 720–850 MPa |
| Cross-references held | 8 grades in 5 systems |
AISI 5160 is the chromium leaf-spring steel: 0.60 % C and 0.80 % Cr, 1600–1900 MPa tensile at 48–52 HRC. Composition, heat treatment, hardness bands and 55Cr3/SUP9 equivalents.
Full data sheet for 5160 → · Equivalent grades → · ASTM A29 →
Group 71 — the neighbouring numbers
Same group digits, so the same broad class of steel. The sequential digits do not rank them.