What are the basic testing methods of a Rockwell hardness tester?

First, an initial test force is applied, and then a main test force is applied to reach the required total force value, after which it returns to the initial test force. The initial test force establishes the zero or reference point. Applying the main test force and holding it for a preset duration is to allow for elastic recovery. Then, the main test force is removed while the initial test force is still retained to determine the change relative to the zero or reference point, thereby obtaining the Rockwell hardness value.

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