Bearing bearing steel cold treatment

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Immediately after quenching cooling to room temperature, placed in the environment below room temperature to stay a certain time, take out at room temperature, below room

temperature treatment cal led cold processing. Bearing bearing steel cold treatment is often used freezer and dry ice alcohol solution.ball bearing
The role of bearing cold treatment

Bearing on the higher dimensional stability; ferrule hardened (especially after quenching), the internal organization retains more residual austenite, the retained austenite is

unstable organization, storage and use of bearings The process will continue to change, thus changing the accuracy of NTN Bearing. To do this using the cold process, it can

reduce the retained austenite in the organization, and slightly improve the hardness of the parts.angular ball bearings

2 bearing the cold treatment process

Stay at room temperature after quenching: after quenching, be sure to make the rings inside and outside the uniform cold to room temperature after the cold treatment, or easy to

crack, cooled to room temperature immediately after cold treatment (usually no more than 30min), otherwise it will abort the austenite to martensite transformation.sealed ball bearing

3, bearing the cold treatment temperature

The temperature of the cold treatment to terminate under the steel of the martensite transformation temperature Mf, while also considering the cold treatment the mechanical

properties and process factors such as

GCr15 steel, cold treatment, use -70 ℃; precision ferrule or device is not very high limit, the optional cold treatment temperature -40 to -70 ℃; ~~ -80 ℃ ultra-precision

bearings, -70 ° C between the cold treatment. Cold temperatures affect the impact of NTN Bearing fatigue and exposure to life.

4, bearing cold treatment, insulation

Although a l arge number of martensitic transformation is completed between the cold to a certain temperature Tilting moment, but are uniform surface and core part of the number

of rings to reach the cold treatment temperature, holding time is generally 1 ~ 1.5h.