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40NiCrMo8-4

alloy_steelquenched_tempered
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High-alloy NiCrMo Q&T steel — Ni ~2%, Cr ~1%, Mo ~0.5%. Very deep hardenability for large cross-sections. UTS 1100-1300 MPa. Used for heavy-duty crankshafts, landing gear, rock drill components, and large forgings requiring uniform through-hardening. Between 34CrNiMo6 and 36NiCrMo16 in hardenability.

Mechanical properties

Related materials

42CrMo4

1.7225
cr_mo

High-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.

🇪🇺 42CrMo4🇫🇷 42CD4🇬🇧 708M40 / EN19🇯🇵 SCM440

34CrNiMo6

1.6582
cr_ni_mo

High-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.

🇪🇺 34CrNiMo6🇨🇳 34CrNiMo6🇬🇧 817M40 / EN24🇯🇵 SNCM439

16MnCr5

1.7131
case_hardening

Low-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.

🇪🇺 16MnCr5🇫🇷 16MC5🇨🇳 16MnCr5🇯🇵 SCr415
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