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55Cr3

1.7176
alloy_steelspring
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Chromium spring steel — simpler and cheaper than 51CrV4 (no vanadium). 0.75% Cr provides adequate hardenability for flat and small-diameter round springs. Used for leaf springs, agricultural springs, lock springs, and general-purpose springs where the V-premium of 51CrV4 is not justified.

International equivalents

FlagStandardCountryGradeNumberMatch
🇺🇸AISIUSAAISI 5155 (approximate)—REF
🇪🇺ENEurope55Cr3 / 1.71761.7176100%

Sources: ASTM A29, EN 10089

Chemical composition comparison (wt%)

Side-by-side: 55Cr3 (EN 10089) vs 55Cr3 / 1.7176 (EN) (EN 10089)

Element55Cr3 (EN 10089)55Cr3 / 1.7176 (EN)Overlap
C—0.52–0.59%—
Si—0–0.4%—

Mechanical properties

Compatibility verdict

55Cr3 and 55Cr3 / 1.7176: 100% composition match

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