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34CrAlNi7

1.8550
alloy_steelnitriding
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THE classic aluminum-containing nitriding steel — Al 0.8-1.2% forms extremely hard AlN nitrided layer (900-1100 HV surface). Cr 1.0-1.3% + Ni 0.85-1.15% provide core strength. Highest achievable surface hardness of all nitriding steels. Used for cylinder liners, piston rings, crankshafts, spindles, and gauges where maximum nitrided hardness is critical. Also known as 34CrAlNi7-10.

International equivalents

FlagStandardCountryGradeNumberMatch
🇪🇺ENEurope34CrAlNi7-10 / 1.85501.8550100%

Sources: EN 10085

Chemical composition comparison (wt%)

Side-by-side: 34CrAlNi7 (EN 10085) vs 34CrAlNi7-10 / 1.8550 (EN) (EN 10085)

Element34CrAlNi7 (EN 10085)34CrAlNi7-10 / 1.8550 (EN)Overlap
C—0.3–0.37%—
Mn—0.4–0.7%—

Mechanical properties

Compatibility verdict

34CrAlNi7 and 34CrAlNi7-10 / 1.8550: 100% composition match

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