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40CrNiMo6

1.6565
alloy_steelcr_ni_mo
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High-strength Cr-Ni-Mo quench and temper steel. Higher C than 34CrNiMo6 for greater strength, with excellent hardenability from Ni+Mo combination. Used for heavy-duty crankshafts, connecting rods, high-strength bolts (class 12.9), gears, and critical structural components in large cross-sections.

International equivalents

FlagStandardCountryGradeNumberMatch
🇺🇸AISIUSAAISI 4340 (approx)G43400REF
🇪🇺ENEurope40CrNiMo61.6565100%

Sources: ASTM A29, EN 10083-3:2006

Chemical composition comparison (wt%)

Side-by-side: 40CrNiMo6 (EN 10083-3) vs 40CrNiMo6 (EN) (EN 10083-3:2006)

Element40CrNiMo6 (EN 10083-3)40CrNiMo6 (EN)Overlap
C—0.36–0.44%—
Si—0–0.4%—

Mechanical properties

Compatibility verdict

40CrNiMo6 and 40CrNiMo6: 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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