Bainidur® 7980 CN: Premium Low‑Alloy Steel for Superior Case Hardening & Carbo‑Nitriding
Bainidur® 7980 CN is specially designed for case hardening and carbo-nitriding. The steel is a lowalloyed steel with a bainitic structure at ambient temperature. Usually the hardness values are between 36 and 40 HRC.
Bainidur® 7980 CN is an optimum solution for a lot of applications regarding economic, mechanical properties and process stability. Fields of applications are gears especially for e-mobility with high torque or large gears in wind mills. The newly developed Bainidur® 7980 CN is characterized by the following properties:
Properties
General
| Property | Value |
|---|---|
Density | 7.79 g/cm³ |
Mechanical
| Property | Value |
|---|---|
Charpy impact energy, V-notch | 20 - 50 J |
Elastic modulus | 205 GPa |
Hardness, Rockwell C | 36 - 40 [-] |
Tensile strength | 1000 - 1300 MPa |
Yield strength | 600 - 900 MPa |
Thermal
| Property | Value |
|---|---|
Specific heat capacity | 460 J/(kg·K) |
Thermal conductivity | 44.5 W/(m·K) |
Chemical properties
| Property | Value |
|---|---|
Carbon | 0.12 - 0.22 % |
Chromium | 1.8 - 2.5 % |
Iron | Balance |
Manganese | 0.5 - 1.5 % |
Molybdenum | 0.5 - 1.5 % |
Silicon | 0.3 - 1 % |
Vanadium | 0.05 - 0.35 % |
Technological properties
| Property | ||
|---|---|---|
| Application areas | Bainidur® 7980 CN is an optimum solution for a lot of applications regarding economic, mechanical properties and process stability. Fields of applications are gears especially for e-mobility with high torque or large gears in wind mills. | |
| General machinability | Very good | |
| Heat Treatment | Soft annealing: 680-710°C - Carburizing: 880-980°C - Quenching: 920-960°C (Center), 860-900°C (Surface) | |
| Hot forming | The flow stress kf for hot forming may be calculated by a Hensel-Spittel type formula (A = 9.329, m1 = -0.00412, m2 = 0.0453, m3 = -0.00808). The diagram is valid for a deformation rate of 10 1/s. The recommended temperature range for hot forming is 1000 - 1250 °C. | |
| Processing history | The powder is produced by gas atomization. | |
| Welding | Due to the low carbon content Bainidur® 7980 CN has a superior weldability. The formation latent heat during the bainitic transformation reduces thermal stresses and therefor the risk of cracking. | |
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