Case-Hardening Steel
8620 · 1.6523
Also known as 21NiCrMo2 / SNCM220
Versatile Ni-Cr-Mo case-hardening steel popular in US specifications.
AISI 8620 (near EN 21NiCrMo2 / 1.6523) is a versatile nickel-chromium-molybdenum case-hardening steel widely used in US-spec components for gears, shafts and pins, giving a hard wear surface with a tough, ductile core.
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 | 0.18 – 0.23 |
| Si | ≤ 0.40 |
| Mn | 0.70 – 0.90 |
| Cr | 0.40 – 0.60 |
| Mo | 0.15 – 0.25 |
| Ni | 0.40 – 0.70 |
Mechanical properties.
Indicative; depends on dimension and heat treatment.
Available forms.
Size range: Ø 6 – 300 mm
Typical applications.
- Gears & pinions
- Shafts
- Pins & bushings
- Camshafts
FAQ.
What is 8620?
AISI 8620 (near EN 21NiCrMo2 / 1.6523) is a versatile nickel-chromium-molybdenum case-hardening steel widely used in US-spec components for gears, shafts and pins, giving a hard wear surface with a tough, ductile core.
Is 8620 the same as 21NiCrMo2?
Yes — 8620 is the European (EN) designation, while 21NiCrMo2, SNCM220 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 8620?
8620 corresponds to 8620 (AISI / SAE), 21NiCrMo2 (1.6523) (EN), SNCM220 (JIS). Equivalents are nearest matches by country/standard; the mill certificate governs the exact specification.
In which forms is 8620 available?
8620 is supplied as Round bar, Bright / cold-drawn bar, Forged, in Ø 6 – 300 mm.
What is 8620 used for?
Typical applications include Gears & pinions, Shafts, Pins & bushings, Camshafts.