how to decide the time for case hardening?

[ht3jyx]

i heard the rule of thumb in heat treatment is that one hour per inch. I assume this is meant to be through hardening. is there any rule of thumb for case hardening?

 

[Yallapragada1022]

Are you carburizing your parts? You can use Harris equation to predict the case depth.

For a specific carburizing temperature:
Case Depth = k (square root of time)
Where k is a constant.
t is time (hours) at temperature.
Case Depth is in inches.

Hope this helps.

Rao Yallapragada