15NiCrMo13
1.6657Heavy-duty NiCrMo case hardening steel — Ni 3.0-3.5% for maximum core toughness and deep hardenability. For the largest case-hardened parts: heavy truck ring gears, mill pinions, crane slewing gears, and large marine gearboxes up to 500mm ruling section. Surface HRC 60-63 with extremely tough core. More Ni than 17CrNiMo6 = even deeper hardenability.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇪🇺 | EN | Europe | 15NiCrMo13 / 1.6657 | 1.6657 | 100% |
Sources: EN 10084
Chemical composition comparison (wt%)
Side-by-side: 15NiCrMo13 (EN) (EN 10084) vs 15NiCrMo13 / 1.6657 (EN) (EN 10084)
| Element | 15NiCrMo13 (EN) | 15NiCrMo13 / 1.6657 (EN) | Overlap |
|---|---|---|---|
| C | 0.14–0.19% | 0.14–0.19% | OK |
| Si | 0–0.4% | 0–0.4% | OK |
| Mn | 0.3–0.6% | 0.3–0.6% | OK |
| Cr | 0.8–1.1% | 0.8–1.1% | OK |
| Mo | 0.15–0.25% | 0.15–0.25% | OK |
| Ni | 3–3.5% | 3–3.5% | OK |
Mechanical properties
Case Hardened
| Property | Value | Unit |
|---|---|---|
| Hardness HRC | 60–63 | HRC |
QT Core
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 1050–1350 | MPa |
| Yield Strength | 800–1100 | MPa |
| Elastic Modulus | ≥ 210 | GPa |
| Density | ≥ 7.85 | g/cm3 |
Compatibility verdict
15NiCrMo13 and 15NiCrMo13 / 1.6657: 100% composition match
Close equivalents but NOT identical.
Related materials
50CrV4
1.8160Chromium-vanadium spring/tool steel — identical alloy system to 51CrV4 (1.8159) but recognized as a separate grade in some standards. Dual use: heavy-duty springs (EN 10089) AND cold work tools (knives, shear blades). V improves temper resistance and grain refinement. UTS 1200-1500 QT. Used for heavy leaf springs, stabilizer bars, torsion bars, and cold work cutting tools.
51CrMoV4
1.7701CrMoV alloyed spring steel — THE European automotive suspension spring material. CrMo gives deep hardenability for large coil springs, V adds grain refinement and secondary hardening for fatigue resistance. UTS 1350-1600 MPa QT. Used for hot-formed coil springs (cars, trucks), leaf springs, torsion bars, and stabilizer bars. Excellent sag resistance to 200°C.
20MnCr5
1.7147Manganese-chromium case-hardening steel with higher core strength than 16MnCr5. Used for heavily loaded gears, shafts, camshafts, and transmission components requiring high surface hardness with tough core. Popular in automotive and heavy machinery.
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