> Couldn't you just temper it? Heat, cold, heat & cold? Wouldn't that make
> it harder?
Depends on what it's made of, and how good you are at accurately judging say
500F from 600F. The temperatures required vary with the steel being
tempered ...
You would start by hardening it, which is usually heating to something on
the order of 1300-1600F (again varies with carbon content and alloying
metals), and then quenching it (quenching method also varies with alloy,
with oil, water, sand, molten lead being some of the options).
Randall
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