20MnCr5/1.7147 Alloy Steel
20MnCr5 steel (1.7147 material) is an European standard carburized steel (case hardening steel) with high strength and toughness and good hardenability. The quenching deformation is small, the low temperature toughness and the machinability are good, but the welding performance is low. It’s generally used after carburizing quenching or quenching and tempering.
Chemical Composition
| Chemical Composition % | |||||||
| Standard | Steel Grade | C | Si ≤ | Mn | P ≤ | S ≤ | Cr |
| EN 10084 | 20MnCr5 | 0.17-0.22 | 0.4 | 1.10-1.40 | 0.025 | 0.035 | 1.00-1.30 |
| 1.7147 | |||||||
| EN 10084 | 20MnCrS5 | 0.17-0.22 | 0.4 | 1.10-1.40 | 0.025 | 0.020-0.040 | 1.00-1.30 |
| 1.7149 | |||||||
Heat Treatment & Mechanical Property
| 20MnCr5/20MnCrS5 | |
| Normalizing,°C | 840-870 |
| Annealing,°C | 650-700 |
| Carburizing,°C | 880-980 |
| Core Hardening,°C | 860-900 |
| Case Hardening,°C | 780-820 |
| Tempering,°C | 150-200 |
Hardness Requirements for Delivery Conditions
| Conditions | 16MnCr5/16MnCrS5 | 20MnCr5/20MnCrS5 |
| Treated to improve shearability(+S) | – | ≤255 |
| Soft annealed(+A) | ≤207 | ≤217 |
| Treated to Hardness range(+TH) | 156-207 | 170-217 |
| Treated to ferrite-pearlite structure and hardness range(+FP) | 140-187 | 152-201 |
| Normalized(+N) | 138-187 | 140-201 |
Hot Working and Heat Treatment Temperatures
Soft Annealing of 20MnCr5 steel
Heat to 650-700℃.
Carburizing
Temperature 900-950℃. Cooing from carburizing temperature: water, oil, air, thermal bath, cooling box.
Hardening
Core hardening 850 – 880℃. Case hardening: 810 -840℃. Quenching media: water, oil, air, thermal bath.
Tempering
Tempering temperature: 150-200℃.
Forging
Hot Forming temperature: 1100-850℃.
Rolling
Rolling temperature 1220℃ , Finishing Templerature > 900℃
Normalizing
850-880℃, air cool
Application
20MnCr5 steel is commonly used in the production of gears due to its ability to be case-hardened and its excellent wear resistance. This makes it well-suited for gears that are exposed to high levels of wear and tear.
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