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30CrMo4

1.7218
alloy_steelquench_temper
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Low-to-medium carbon Cr-Mo QT steel — lower C than 34CrMo4/42CrMo4 giving better weldability and toughness. THE gas cylinder and pressure vessel grade in Europe (EN ISO 9809). Good hardenability for medium sections. Also used for automotive crankshafts, gears, and high-pressure hydraulic components. AISI 4130 equivalent.

International equivalents

FlagStandardCountryGradeNumberMatch
🇺🇸AISIUSAAISI 4130—REF
🇪🇺ENEurope30CrMo4 / 1.72181.7218100%

Sources: ASTM A29, EN 10083-3

Chemical composition comparison (wt%)

Side-by-side: 30CrMo4 (EN 10083-3) vs 30CrMo4 / 1.7218 (EN) (EN 10083-3)

Element30CrMo4 (EN 10083-3)30CrMo4 / 1.7218 (EN)Overlap
C—0.26–0.33%—
Si—0–0.4%—

Mechanical properties

Compatibility verdict

30CrMo4 and 30CrMo4 / 1.7218: 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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