Hello thanks for the reply, I certainly learned a bit, however I was more talking about using a saline bath to bring the piece evenly to temperature, prior to quenching.
What are you making? For knife blades it wouldn't be necessary. Some steels do need to stage the heat treat by, for example bring and hold at 1200F for an hour before finally bringing to the austinizing temperature. Those steels are usually high alloy. None would benefit from a saline bath.
Now if you are speaking of using a salt pot for heat treating, that's another animal all together. It's not saline (salt water) but other kinds of salts. These are melted and used to dip the steel in and bring to temperature. Using this method is superior to ovens and forges because of the density of the fluid and the easier control of the heat. Normally the hardening temperature using salt pots is 25-50F less than with a forge or kiln.