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High-Precision Gear Steel
Case Hardening Steel 20MnCr5/16MnCr5
20MnCr5 is a premium case-hardening alloy steel engineered for high-performance components that demand a superior balance of surface hardness and core toughness. Widely used for carburized parts, it responds exceptionally well to heat treatment, producing a wear-resistant outer layer while maintaining a resilient, shock-absorbing center. It is the industrial standard for gears, shafts, and transmission systems where fatigue resistance and dimensional stability are critical.
Key Features
- High surface hardness after carburizing
- Exceptional core strength & toughness
- Superior fatigue & wear resistance
- Excellent machinability (annealed)
- Consistent heat treatment response
Main Applications
- Automotive carburized gears
- Transmission shafts & pinions
- Industrial sprockets & bushes
- Heavy-duty power transmission
- General engineering moving parts
International Standards Comparison
| DIN/WNr | EN | AISI | JIS | ISO |
|---|---|---|---|---|
| 1.7147 | 20MnCr5 | 5120 | SCr420 | 20MnCr5 |
Chemical Composition (Typical Analysis in %)
| C | Si | Mn | Cr | P (max) | S (max) |
|---|---|---|---|---|---|
| 0.17-0.22 | 0.10-0.40 | 1.10-1.40 | 1.00-1.30 | 0.025 | 0.035 |
Material Properties
- Hardening: Achieves high hardness for wear-critical surfaces.
- Core Resilience: Prevents brittle failure in transmission parts.
- Stability: Maintains precision dimensions after case hardening.