31CrMoV9
1.8519THE standard nitriding steel — Cr-Mo-V combination optimized for gas nitriding. Vanadium refines grain and forms hard VN nitrides (surface >750 HV). Better core toughness than 31CrMo12 at similar strength. THE default choice when "nitriding steel" is specified without further detail. Used for crankshafts, gears, spindles, extrusion screws, and precision machine components.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇪🇺 | EN | Europe | 31CrMoV9 / 1.8519 | 1.8519 | 100% |
Sources: EN 10085
Chemical composition comparison (wt%)
Side-by-side: 31CrMoV9 (EN 10085) vs 31CrMoV9 / 1.8519 (EN) (EN 10085)
| Element | 31CrMoV9 (EN 10085) | 31CrMoV9 / 1.8519 (EN) | Overlap |
|---|---|---|---|
| C | — | 0.27–0.34% | — |
| Si | — | 0–0.4% | — |
Mechanical properties
Compatibility verdict
31CrMoV9 and 31CrMoV9 / 1.8519: 100% composition match
Related materials
42CrMo4
1.7225High-strength quenched and tempered chromium-molybdenum steel. Widely used for shafts, gears, crankshafts, connecting rods, and high-strength bolts. Excellent hardenability and good fatigue resistance.
34CrNiMo6
1.6582High-strength quenched and tempered Cr-Ni-Mo steel. Excellent hardenability and toughness, suitable for large cross-sections. Used for heavy-duty shafts, gears, turbine parts, and aerospace components.
16MnCr5
1.7131Low-carbon case-hardening steel with manganese and chromium. Excellent for carburizing to produce a hard, wear-resistant surface with a tough core. Standard choice for gears, camshafts, piston pins, and transmission components.
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