Skip to content

31CrMo12

1.8515
alloy_steelnitriding
Export PDF€4.90

Deep nitriding steel with 3% Cr — the highest Cr content in the EN 10085 nitriding series. Produces the deepest and hardest nitrided case (surface hardness >900 HV, case depth >0.5mm). Core strength 800-1000 MPa QT. Used where maximum surface hardness and wear resistance with a tough core is needed: large gears, cylinder liners, spindles, precision measuring tools, and heavy-duty sliding components.

International equivalents

FlagStandardCountryGradeNumberMatch
🇪🇺ENEurope31CrMo12 / 1.85151.8515100%

Sources: EN 10085

Chemical composition comparison (wt%)

Side-by-side: 31CrMo12 (EN 10085) vs 31CrMo12 / 1.8515 (EN) (EN 10085)

Element31CrMo12 (EN 10085)31CrMo12 / 1.8515 (EN)Overlap
C—0.28–0.35%—
Si—0–0.4%—

Mechanical properties

Compatibility verdict

31CrMo12 and 31CrMo12 / 1.8515: 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
More Alloy Steel materials →

Export this comparison as PDF

Professional datasheet with equivalents, composition, and properties. Ready for your QM documentation.

Download PDF — €4.90

Included with PRO subscription