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16MnCrS5

1.7139
alloy_steelcase_hardening
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Free-cutting variant of 16MnCr5 (1.7131) — sulfur addition (0.020-0.040%) for improved machinability on CNC automatics. Same case-hardening properties: surface 60-62 HRC after carburizing. THE high-volume automotive gear steel where machining cost matters. Used for transmission gears, shafts, pinions, and other carburized parts produced on CNC lathes and multi-spindle automatics.

International equivalents

FlagStandardCountryGradeNumberMatch
🇺🇸AISIUSAAISI 5115 (approximate, no S)—REF
🇪🇺ENEurope16MnCrS5 / 1.71391.7139100%

Sources: ASTM A29, EN 10084

Chemical composition comparison (wt%)

Side-by-side: 16MnCrS5 (EN 10084) vs 16MnCrS5 / 1.7139 (EN) (EN 10084)

Element16MnCrS5 (EN 10084)16MnCrS5 / 1.7139 (EN)Overlap
C—0.14–0.19%—
Si—0–0.4%—

Mechanical properties

Compatibility verdict

16MnCrS5 and 16MnCrS5 / 1.7139: 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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