Description
20MnCr5 Grade Introduction:
20MnCr5 is a low alloy case-hardening steel used in engineering applications requiring high surface wear resistance and a tough core. It is ideal for components needing a core tensile strength of 1000-1300 N/mm². The steel’s case-hardened surface offers exceptional wear resistance, while the tough core withstands shock loads, leading to a longer service life.
20MnCr5 Grade Application:
20MnCr5 (1.7147) steel is widely used in rotating machinery for gearing applications. It is typically used in parts such as valve bodies, pumps, high-load wheels, bolts, gears, and internal combustion engines. Other uses include electric locomotives, machine tools, tractors, steel rolling equipment, railway vehicles, and mining machinery components like transmission shafts, rollers, and sleeves.
20MnCr5 Equivalent Grades:
| Standard | Grades |
|---|---|
| ASTM A29/A29M | 20MnCr5 |
| DIN EN 10083/3 | 1.7131 |
| JIS G4053 | – |
| DIN 17210 | – |
Additional Steel Grades:
MS, EN1A, EN8, EN24, EN31, 42CrMo4, H13, D2, M42, DIN-1.2714, P20, SCM420, SAE1018, SAE4140, 16MnCr5, C45, 55C8, SAE52100, S40C, and more.
20MnCr5 Chemical Composition:
| Element | C | Si | Mn | P | S | Cr |
|---|---|---|---|---|---|---|
| Content | 0.17-0.22 | ≤0.40 | 1.10-1.40 | ≤0.035 | ≤0.035 | 1.00-1.30 |
20MnCr5 Mechanical Properties:
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 520 | MPa |
| Yield Strength | 415 (min) | MPa |
| Bulk Modulus | 140 | GPa |
| Shear Modulus | 80 | GPa |
| Poisson’s Ratio | 0.27-0.30 | |
| Thermal Conductivity | 46.6 | W/mK |
20MnCr5 Hardness:
- Hardness: 218 HB
20MnCr5 Heat Treatment:
The heat treatment of 20MnCr5 involves specific temperatures and times, depending on the shape, size, and other variables. Heating, cooling, and soaking times must be carefully managed, along with the quenching medium. It’s recommended to consult a heat treatment specialist for guidance.
20MnCr5 Hardening:
- Hardening Temperature: 780-820°C
20MnCr5 Tempering:
- Tempering Temperature: 150-200°C (at least twice)
20MnCr5 Physical Properties:
| Temperature (°C) | Thermal Conductivity (W/m*K) |
|---|---|
| 20 | 11.7 |
| 350 | 12.8 |
| 700 | 13.5 |
20MnCr5 Thermal Properties:
- Thermal Conductivity: 46.6 W/mK
20MnCr5 Forging Properties:
- Hot Forming Temperature: 1100-850°C
20MnCr5 Stress Relieving:
- Stress-relief Annealing: 550-600°C
20MnCr5 Normalizing:
- Normalizing Temperature: 850-880°C, followed by air cooling.
20MnCr5 Annealing:
- Annealing Temperature: 650-700°C
20MnCr5 Density:
- Density: 7.7-8.03 g/cm³
20MnCr5 Machinability:
20MnCr5 offers good machinability, particularly when annealed. Machining is relatively easy with proper cutting tools and conditions.
20MnCr5 Welding:
Due to its composition, 20MnCr5, a manganese-chromium case hardening steel, has limited weldability. While it offers good hardenability, machinability, and wear resistance, it is typically not ideal for welding applications.
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