8620 / 20NiCrMo2-2
1.6523Nickel-chromium-molybdenum case-hardening steel. Good combination of core toughness and case hardness. The most widely used case-hardening steel in the US (AISI 8620). Used for gears, pinions, worm drives, king pins, and cross-shafts.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | AISI | USA | AISI 8620 | G86200 | REF |
| 🇪🇺 | EN | Europe | 20NiCrMo2-2 | 1.6523 | 100% |
| 🇨🇳 | GB | China | 20CrNiMo | — | 90% |
| 🇯🇵 | JIS | Japan | SNCM220 | — | 88% |
Sources: ASTM A29, EN 10084:2008, GB/T 3077, JIS G4103
Mechanical properties
Compatibility verdict
8620 / 20NiCrMo2-2 and 20CrNiMo: 90% 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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