Offer 40cr Materials Quenching And Tempering Precautions - China

Precautions in quenching and tempering of 40Cr materials

Heating rate control: During the quenching and heating process, the heating rate should be controlled to avoid excessive temperature differences between the surface and the core of the workpiece, resulting in uneven heating.

Too fast a heating rate may cause the surface of the workpiece to overheat, while the core temperature is insufficient, affecting the quenching effect.

Quenching deformation control: 40Cr materials are prone to deformation during quenching, especially workpieces with complex shapes.

In order to reduce deformation, the workpiece can be preheated before quenching, or the workpiece can be fixed with a suitable fixture.

In addition, it is also important to choose a suitable quenching medium and quenching method.

For example, oil quenching and graded quenching can effectively reduce deformation.

Tempering sufficiency: During high-temperature tempering, 40Cr materials must ensure that the tempering is sufficient so that the residual stress inside the workpiece is fully released.

If the tempering is not sufficient, the residual stress may cause the workpiece to deform or crack during use.

During the tempering process, the temperature and holding time should be strictly controlled according to the process requirements.

Surface quality inspection: After quenching and tempering of 40Cr materials, the surface quality of the workpiece should be inspected to ensure that there are no defects such as quenching cracks, oxide scale, decarburization, etc.

Surface defects will affect the performance and life of the workpiece, and the surface needs to be cleaned or repaired when necessary.

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