Bob Swinney wrote:

Nice report, Don! I went all the way through your explanation to the next
to last step; quenching the layer of Kasenite. I would have neglected to do
that before I read your post. It is (should have been) obvious that a final
quench will add an extra bit of "treatment" to a case hardening job. Thanks
for the information.

Absolutely necessary! Case hardening is simply diffusing carbon into
the outer regions of the steel. You now have to treat it as high carbon
steel.

Ted