Low-alloy case-hardening steel with higher strength and hardenability than 16MnCr5. Extremely popular for heavy-duty gears, shafts, and other stressed mechanical parts.
| Element | Content (%) |
|---|---|
| Carbon (C) | 0.17 – 0.22 |
| Silicon (Si) | 0.40 max |
| Manganese (Mn) | 1.10 – 1.40 |
| Chromium (Cr) | 0.80 – 1.10 |
| Phosphorus (P) | 0.025 max |
| Sulphur (S) | 0.035 max |
Typical core properties after blank hardening
1000 – 1300 MPa
750 MPa (min)
9 - 14 %
217 HB (Annealed max)
General guidelines for processing and heat treatment
Common industrial applications for 20MnCr5 case-hardening steel
Heavy-duty transmission gears requiring a hard, wear-resistant surface and a tough core.
High-stress splined shafts and axles used in automotive and heavy machinery.
Piston bolts, spindles, and mechanical controlling parts subjected to dynamic loading.