51CrV4
1.8159Chromium-vanadium spring steel. The most important European spring steel grade. Excellent fatigue resistance and high elastic limit after heat treatment. Used for coil springs, leaf springs, torsion bars, anti-roll bars, and high-strength fasteners.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | AISI | USA | AISI 6150 | G61500 | REF |
| 🇪🇺 | EN | Europe | 51CrV4 | 1.8159 | 100% |
| 🇪🇺 | DIN | Europe | 50CrV4 (old) | — | 99% |
| 🇨🇳 | GB | China | 50CrVA | — | 93% |
| 🇯🇵 | JIS | Japan | SUP10 | — | 90% |
Sources: ASTM A29, EN 10089:2002, DIN 17221, GB/T 1222, JIS G4801
Mechanical properties
Compatibility verdict
51CrV4 and 50CrV4 (old): 99% 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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