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17CrNiMo6

1.6587
alloy_steelcase_hardening
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Premium CrNiMo case hardening steel for demanding gear applications. Ni 1.2-1.5% + Mo 0.25-0.35% give excellent core toughness and deep hardenability — suitable for large gears up to 400mm ruling section. Surface HRC 60-63 after carburizing. THE wind turbine gearbox steel. Also used for large industrial gearboxes, mining equipment, and heavy truck transmissions.

International equivalents

FlagStandardCountryGradeNumberMatch
🇺🇸AISIUSAAISI 4820 (approximate)—REF
🇪🇺ENEurope17CrNiMo6 / 1.65871.6587100%

Sources: ASTM A29, EN 10084

Chemical composition comparison (wt%)

Side-by-side: 17CrNiMo6 (EN 10084) vs 17CrNiMo6 / 1.6587 (EN) (EN 10084)

Element17CrNiMo6 (EN 10084)17CrNiMo6 / 1.6587 (EN)Overlap
C—0.15–0.21%—
Si—0–0.4%—

Mechanical properties

Compatibility verdict

17CrNiMo6 and 17CrNiMo6 / 1.6587: 100% composition match

Related materials

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34CrNiMo6

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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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🇪🇺 16MnCr5🇫🇷 16MC5🇨🇳 16MnCr5🇯🇵 SCr415
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