55Cr3
1.7176Chromium spring steel — simpler and cheaper than 51CrV4 (no vanadium). 0.75% Cr provides adequate hardenability for flat and small-diameter round springs. Used for leaf springs, agricultural springs, lock springs, and general-purpose springs where the V-premium of 51CrV4 is not justified.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | AISI | USA | AISI 5155 (approximate) | — | REF |
| 🇪🇺 | EN | Europe | 55Cr3 / 1.7176 | 1.7176 | 100% |
Sources: ASTM A29, EN 10089
Chemical composition comparison (wt%)
Side-by-side: 55Cr3 (EN 10089) vs 55Cr3 / 1.7176 (EN) (EN 10089)
| Element | 55Cr3 (EN 10089) | 55Cr3 / 1.7176 (EN) | Overlap |
|---|---|---|---|
| C | — | 0.52–0.59% | — |
| Si | — | 0–0.4% | — |
Mechanical properties
Compatibility verdict
55Cr3 and 55Cr3 / 1.7176: 100% composition match
Related materials
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16MnCr5
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