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40NiCrMo7

1.6563
alloy_steelquench_temper
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High-nickel Cr-Mo quench & temper steel for large cross-sections. 1.6-2.0% Ni gives superior hardenability compared to 39NiCrMo3 — through-hardening up to ~130mm diameter. Close to AISI 4340 composition. Used for heavy crankshafts, large gears, turbine shafts, connecting rods, and critical structural fasteners in energy and heavy machinery sectors.

International equivalents

FlagStandardCountryGradeNumberMatch
🇺🇸AISIUSAAISI 4340 (close)—REF
🇪🇺ENEurope40NiCrMo7 / 1.65631.6563100%

Sources: ASTM A29, EN 10083-3

Chemical composition comparison (wt%)

Side-by-side: 40NiCrMo7 (EN 10083-3) vs 40NiCrMo7 / 1.6563 (EN) (EN 10083-3)

Element40NiCrMo7 (EN 10083-3)40NiCrMo7 / 1.6563 (EN)Overlap
C—0.37–0.44%—
Si—0–0.4%—

Mechanical properties

Compatibility verdict

40NiCrMo7 and 40NiCrMo7 / 1.6563: 100% composition match

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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