I would think it would fare no better than straight sugar, as corn syrup
is a bunch of different sugars in water.
All the stuff about using sugar in various forms for hardening got the
metal no hotter than red or cherry red, all that's needed for ordinary
I just received the Kasenite. I've yet to try it, but I bet it contains
some kind of salt that is molten at high heat, dissolves carbon, and
sticks to the metal. May also contain clay.
Do a search on heat treating salts. There are a lot of different salts
that are used in heat treating. Some are fairly toxic though. Depending
on the salts used, you can go from a few hundred F to almost 2000F.
Hmm. That's an idea.
Also, I bet I could put the metal and some table salt in a pouch made of
heat-treating stainless steel foil, and the molten salt would act as a
heat transfer agent, allowing the torch to heat the whole thing, not
just the foil.
Another good idea, one than can be combined with the foil pouch idea.
Didn't happen. That heat-treating stainless steel foil is pretty
durable, and had no problem sitting in the flame at an orange heat.
It's rated for 1800 degrees F (= 982 C), which is just about the limit
for propane-air in a little firebrick muffle.
sodium chloride melts at 1475F give or take a few degrees. So it's already in
the right ballpark for most hardening uses. That, with its cheapness and
relative safety, make it an easy thing to try out. (Note that safety refers to
poisoning yourself, not pouring molten salt onto anything made out of wood,
concrete or meat :-(
These are pictures of the test I did:-
I was experimenting with hardening some 4340 (actually BS 970 1955 EN24) by
heating in the molten salt and then quenching directly into oil at 340F. The
hardness at the surface tested to 54 HRC, which is about what I was aiming
for. There was no scaling noticed, although the steel was blued from the oil.
The results were sufficiently good that I will probably build a couple of
permanent salt baths, once I've got all of the current jobs out of the way.
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