Case-Hardening Steel
18CrNiMo7-6 · 1.6587
Also known as former 17CrNiMo6
High-strength case-hardening steel for large, heavily loaded gears.
18CrNiMo7-6 (material 1.6587) is a high-strength chromium-nickel-molybdenum case-hardening steel for large, heavily loaded gears, shafts and bearings, offering deep hardening and excellent core toughness.
International equivalents.
The same steel by country and standard — near matches; mill certificate governs.
Chemical composition.
Indicative, % by weight per EN 10084. Mill certificate governs.
| Element | % |
|---|---|
| C | 0.15 – 0.21 |
| Si | ≤ 0.40 |
| Mn | 0.50 – 0.90 |
| Cr | 1.50 – 1.80 |
| Mo | 0.25 – 0.35 |
| Ni | 1.40 – 1.70 |
Mechanical properties.
Indicative; depends on dimension and heat treatment.
Available forms.
Size range: Ø 16 – 600 mm
Typical applications.
- Large industrial gears
- Wind-turbine gearboxes
- Heavy gear shafts
- Bearings
FAQ.
What is 18CrNiMo7-6?
18CrNiMo7-6 (material 1.6587) is a high-strength chromium-nickel-molybdenum case-hardening steel for large, heavily loaded gears, shafts and bearings, offering deep hardening and excellent core toughness.
Is 18CrNiMo7-6 the same as former 17CrNiMo6?
Yes — 18CrNiMo7-6 is the European (EN) designation, while former 17CrNiMo6 are the matching names used in other countries and standards (for example AISI/SAE in the USA, JIS in Japan, GB in China, former DIN in Germany). They are near equivalents and may differ slightly in chemistry; the mill certificate governs the exact specification.
What are the international equivalents of 18CrNiMo7-6?
18CrNiMo7-6 corresponds to 18CrNiMo7-6 (1.6587) (EN), 4320 (near) (AISI / SAE), 17CrNiMo6 (former DIN). Equivalents are nearest matches by country/standard; the mill certificate governs the exact specification.
In which forms is 18CrNiMo7-6 available?
18CrNiMo7-6 is supplied as Round bar, Forged, Bright / cold-drawn bar, in Ø 16 – 600 mm.
What is 18CrNiMo7-6 used for?
Typical applications include Large industrial gears, Wind-turbine gearboxes, Heavy gear shafts, Bearings.