Typically, OCS is heated to non-magnetic and then quenched edge down in a mix of 50% 30 wt motor oil and ATF.

this smokes a bunch!

Without a real hardness tester, we've found that most "eye ball" heat treating is pretty much guess work and is not very consistent.

For more elegant means take a look at the salt pot section of our web site ... very much more controlled and consistent. (We don't recommend this for the casual experience!)