32CrMoV12-10
1.7765Premium CrMoV nitriding steel with highest Cr (3%) and Mo (1%) in the nitriding series — designed for maximum core strength after nitriding. Higher strength than 31CrMoV9 and 31CrMo12. AMS 6481 for aerospace. THE gun barrel material. Nitrided surface reaches 860+ HV while maintaining tough core at 415 HV. Used for gun barrels, high-performance gears, ball bearing races, crankshafts, and components requiring the ultimate combination of core strength + surface hardness.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | AMS | USA | AMS 6481 | — | REF |
| 🇪🇺 | EN | Europe | 32CrMoV12-10 / 1.7765 | 1.7765 | 100% |
Sources: AMS 6481, SEL
Chemical composition comparison (wt%)
Side-by-side: 32CrMoV12-10 (EN) (SEL) vs 32CrMoV12-10 / 1.7765 (EN) (SEL)
| Element | 32CrMoV12-10 (EN) | 32CrMoV12-10 / 1.7765 (EN) | Overlap |
|---|---|---|---|
| C | 0.3–0.35% | 0.3–0.35% | OK |
| Si | 0–0.35% | 0–0.35% | OK |
| Mn | 0–0.6% | 0–0.6% | OK |
| P | 0–0.025% | 0–0.025% | OK |
| S | 0–0.01% | 0–0.01% | OK |
| Cr | 2.8–3.2% | 2.8–3.2% | OK |
| Mo | 0.8–1.2% | 0.8–1.2% | OK |
| V | 0.25–0.35% | 0.25–0.35% | OK |
Mechanical properties
QT
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 970–1200 | MPa |
| Yield Strength | 800–1000 | MPa |
| Elongation | 10–14 | % |
| Elastic Modulus | ≥ 210 | GPa |
| Density | ≥ 7.85 | g/cm3 |
Compatibility verdict
32CrMoV12-10 and 32CrMoV12-10 / 1.7765: 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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