55Cr3
Data under review55Cr3 is the EN chromium spring steel (1.7176) for hot-rolled spring bar and flat products. It occupies the same niche as SAE 5155/5160 in European spring making, with tighter phosphorus and sulfur limits.
Chemical composition
| Element | Content (%) |
|---|---|
| C | 0.52–0.59 |
| Si | ≤0.40 |
| Mn | 0.70–1.00 |
| P | ≤0.025 |
| S | ≤0.025 |
| Cr | 0.70–1.00 |
Weight percent, per the governing standard ranges. Actual values per heat are on the mill certificate.
Properties
| Hardness (spring temper) | 40–48 HRC typical |
| Tensile strength | 1200–1500 MPa (Q&T spring temper, typ.) |
| Density | 7.85 g/cm³ |
Heat treatment
Anneal 820–850 °C; quench 840–870 °C oil; temper 400–520 °C (EN 10089 delivery conditions +A/+QT).
Equivalent grades
| Standard | Designation |
|---|---|
| din | 1.7176 (55Cr3) |
| aisi | 5155 (near) |
| jis | SUP9 family (near) |
| gb | 55CrMnA (near) |
Compare side by side: 55Cr3 vs 5150 · 55Cr3 vs 5160
Equivalents overlap in chemistry and use but are not always identical — see our equivalents guide before substituting in certified designs.
Applications & Processing
Applications: Leaf and parabolic springs, coil springs, stabilizer bars.
Processing: Supplied annealed or Q&T per EN 10089; decarburization limits are standardized — check the delivery condition on the certificate.
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Ask for a quotationVisit NasteelSource: EN 10089 published ranges · Last updated 2026-11-03. Data is indicative — verify critical values against the governing standard and mill certificate before use.