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51CrMoV4

1.7701
alloy_steelspring
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CrMoV alloyed spring steel — THE European automotive suspension spring material. CrMo gives deep hardenability for large coil springs, V adds grain refinement and secondary hardening for fatigue resistance. UTS 1350-1600 MPa QT. Used for hot-formed coil springs (cars, trucks), leaf springs, torsion bars, and stabilizer bars. Excellent sag resistance to 200°C.

International equivalents

FlagStandardCountryGradeNumberMatch
🇺🇸AISIUSAAISI 6150 (approximate)—REF
🇪🇺ENEurope51CrMoV4 / 1.77011.7701100%

Sources: ASTM A29, EN 10089

Chemical composition comparison (wt%)

Side-by-side: 51CrMoV4 (EN 10089) vs 51CrMoV4 / 1.7701 (EN) (EN 10089)

Element51CrMoV4 (EN 10089)51CrMoV4 / 1.7701 (EN)Overlap
C—0.47–0.55%—
Si—0–0.4%—

Mechanical properties

Compatibility verdict

51CrMoV4 and 51CrMoV4 / 1.7701: 100% composition match

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