Case-Hardening Steel
20MnCr5 · 1.7147
Also known as 5120 (near)
Higher-strength case-hardening steel for heavily loaded gears.
20MnCr5 (material 1.7147) is a chromium-manganese case-hardening steel with higher core strength than 16MnCr5, used for heavily loaded gears, shafts and transmission parts. Supplied as hot-rolled and cold-drawn bar.
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 | 0.17 – 0.22 |
| Si | ≤ 0.40 |
| Mn | 1.10 – 1.40 |
| Cr | 1.00 – 1.30 |
| P | ≤ 0.025 |
| S | ≤ 0.035 |
Mechanical properties.
Indicative; depends on dimension and heat treatment.
Available forms.
Size range: Ø 6 – 250 mm
Typical applications.
- Heavily loaded gears
- Gear shafts
- Transmission parts
- Bearings races
FAQ.
What is 20MnCr5?
20MnCr5 (material 1.7147) is a chromium-manganese case-hardening steel with higher core strength than 16MnCr5, used for heavily loaded gears, shafts and transmission parts. Supplied as hot-rolled and cold-drawn bar.
Is 20MnCr5 the same as 5120 (near)?
Yes — 20MnCr5 is the European (EN) designation, while 5120 (near) 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 20MnCr5?
20MnCr5 corresponds to 20MnCr5 (1.7147) (EN), 5120 (near) (AISI / SAE), 20MnCr5 (GB). Equivalents are nearest matches by country/standard; the mill certificate governs the exact specification.
In which forms is 20MnCr5 available?
20MnCr5 is supplied as Round bar, Bright / cold-drawn bar, in Ø 6 – 250 mm.
What is 20MnCr5 used for?
Typical applications include Heavily loaded gears, Gear shafts, Transmission parts, Bearings races.