Bainidur® 7980 CN

Alternative and trade names
1.7980, 18MnCrMoV4-8-7
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Description

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:


  • Good processability with LPBF.
  • High strength and toughness.
  • Excellent case hardening and carbonitriding properties
  • Equivalent Materials

    This material data has been provided by Deutsche Edelstahlwerke Specialty Steel (DEW).

    All metrics apply to room temperature unless otherwise stated. SI units used unless otherwise stated.
    Equivalent standards are similar to one or more standards provided by the supplier. Some equivalent standards may be stricter whereas others may be outside the bounds of the original standard.

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    Properties

    General

    PropertyTemperatureValue

    Density

    23.0 °C

    7.79 g/cm³

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    Mechanical

    PropertyTemperatureValueComment

    Charpy impact energy, V-notch

    23.0 °C

    20 - 50 J

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    Elastic modulus

    23.0 °C

    205 GPa

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    Hardness, Rockwell C

    23.0 °C

    36 [-]

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    40

    Tensile strength

    23.0 °C

    1000 - 1300 MPa

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    Yield strength

    23.0 °C

    600 - 900 MPa

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    Thermal

    PropertyTemperatureValue

    Specific heat capacity

    23.0 °C

    460 J/(kg·K)

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    Thermal conductivity

    23.0 °C

    44.5 W/(m·K)

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    Chemical properties

    PropertyValue

    Carbon

    0.12 - 0.22 %

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    Chromium

    1.8 - 2.5 %

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    Iron

    Balance

    Manganese

    0.5 - 1.5 %

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    Molybdenum

    0.5 - 1.5 %

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    Silicon

    0.3 - 1 %

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    Vanadium

    0.05 - 0.35 %

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    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.