4161
Data under review4161 is a spring-range Cr-Mo steel: 5160-class carbon and chromium with molybdenum added for temper resistance and through-hardening in thicker spring sections. It is less commonly stocked than 5160 but specified for heavier springs.
Chemical composition
| Element | Content (%) |
|---|---|
| C | 0.56–0.64 |
| Si | 0.15–0.35 |
| Mn | 0.75–1.00 |
| P | ≤0.035 |
| S | ≤0.040 |
| Cr | 0.70–0.90 |
| Mo | 0.25–0.35 |
Weight percent, per the governing standard ranges. Actual values per heat are on the mill certificate.
Properties
| Hardness (spring temper) | 40–50 HRC typical |
| Tensile strength | 1200–1500 MPa (Q&T spring temper, typ.) |
| Density | 7.85 g/cm³ |
Heat treatment
Anneal 800–830 °C; quench 850–880 °C oil; temper 400–520 °C.
Equivalent grades
| Standard | Designation |
|---|---|
| din | 61SiCr7 is Si-type (near family) |
| aisi | 4161 |
| jis | SUP9 family (near) |
| gb | 60CrMnMoA (near) |
Compare side by side: 4161 vs 5160 · 4161 vs 4145
Equivalents overlap in chemistry and use but are not always identical — see our equivalents guide before substituting in certified designs.
Applications & Processing
Applications: Heavy leaf and coil springs, torsion bars, stabilizer bars, blades.
Processing: As 5160; the Mo addition widens the safe tempering window.
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Ask for a quotationVisit NasteelSource: SAE J404 published ranges · Last updated 2026-11-03. Data is indicative — verify critical values against the governing standard and mill certificate before use.