20MnCr5 STEEL
20MnCr5 for hard surfaces and tough cores.
20MnCr5 is a low-alloy engineering case-hardening steel developed for components that require high core tensile strength together with a hard, wear-resistant surface after case hardening.
The grade can be carburised and subsequently heat treated to produce a high-hardness surface while retaining a tough and shock-resistant core. It is commonly used for demanding mechanical and automotive components.
- Case hardening capability for a hard surface and ductile core
- High surface hardness and wear resistance after carburising
- Good machinability in the annealed condition
- Weldable with suitable preheating and post-weld treatment
- Core tensile strength of 1000 – 1300 N/mm²
20MnCr5 steel chemical composition.
| Element | % Content |
|---|---|
| C (Carbon) | 0.17 – 0.22 |
| Mn (Manganese) | 1.10 – 1.40 |
| Cr (Chromium) | 1.00 – 1.30 |
| S (Sulphur, max) | 0.035 |
| P (Phosphorus, max) | 0.025 |
| Si (Silicon) | ≤ 0.40 |
| Fe (Iron) | Balance |
20MnCr5 available in the shapes you need.
20MnCr5 is supplied in flat, square and round bar forms and can be provided in different sizes according to requirements. The grade is available in flat, square and round shapes for a range of engineering applications.
Strength and surface hardness.
| Property | Typical Values |
|---|---|
| Core Tensile Strength | 1000 – 1300 N/mm² |
| Yield Strength (approx.) | 600 – 800 N/mm² |
| Elongation | 10 – 14 % |
| Impact Toughness (Charpy V-notch) | 35 – 45 J |
| Case Hardness (after carburising & quenching) | 58 – 62 HRC |
| Core Hardness (after treatment) | ~ 30 – 40 HRC |
Controlled treatment for case hardness and core toughness.
| Process | Temperature (°C) | Medium / Notes |
|---|---|---|
| Carburising | 880 – 940 | Carburising atmosphere |
| Hardening | 820 – 860 | Oil quench |
| Tempering | 150 – 200 | To required hardness and toughness |
| Annealing | 650 – 700 | Furnace cool; improves machinability |
International grade equivalents.
| Standard | Equivalent Grade |
|---|---|
| DIN / EN | 20MnCr5 (EN 10084) |
| AISI / SAE | 5120 |
| Indian Standard (IS) | IS 9175 (Part 20) – 20MnCr5 |
Built for demanding mechanical applications.
20MnCr5 for hard surfaces and dependable cores.
20MnCr5 is a low-alloy case-hardening steel that combines a hard, wear-resistant surface with a tough and shock-resistant core. Following carburising and heat treatment, it provides good wear performance and long service life in demanding mechanical and automotive applications. Its machinability, weldability and dependable strength make it suitable for gears, shafts, axles, camshafts and other critical components.