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37Cr4

1.7034
alloy_steelquench_temper
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Simple chromium QT steel without Mo — lower cost than CrMo grades. 1% Cr gives adequate hardenability for small-to-medium sections (up to ~40mm). Close to AISI 5135. Used for bolts, studs, axles, shafts, and general mechanical engineering where moderate strength suffices and Mo premium is not justified.

International equivalents

FlagStandardCountryGradeNumberMatch
🇺🇸AISIUSAAISI 5135 (approximate)—REF
🇪🇺ENEurope37Cr4 / 1.70341.7034100%

Sources: ASTM A29, EN 10083-3

Chemical composition comparison (wt%)

Side-by-side: 37Cr4 (EN 10083-3) vs 37Cr4 / 1.7034 (EN) (EN 10083-3)

Element37Cr4 (EN 10083-3)37Cr4 / 1.7034 (EN)Overlap
C—0.34–0.41%—
Si—0–0.4%—

Mechanical properties

Compatibility verdict

37Cr4 and 37Cr4 / 1.7034: 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

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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

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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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