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Spheroidozed steel is steel that has been heat treated to distribute the carbides in small spheres. Notice that Kevin said "standard spheroidized stock". Most is going to come that way. Some suppliers will even state the percentage of spheroidization.
A molten salt pot gives more heat control than an oven because the molten salts will transmit heat better than hot air and there's no such thing as too much heat control when it comes to heat treating. However, there is a down side to them. They are more dangerous to use. If you are not careful about how you heat them up you can end up with a face full of molten salts at over 1000?. A stainless steel rod, preferably tapered, will help prevent this. I also remember someone stating that fumes from the salt pots can accelerate rusting of steel tools in the shop.
If you google molten salt pots I'm sure that you'll come across some discussions.
Doug
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