The water from a torch on clean steel is from the flame.
Rust is iron oxide with some water of crystalization in it. It takes
higher than boiling temperatures to get it out, red hot sounds about right.
The lurking metallurgist.
Bruce Kettunen
'57 3100
>>It's a moisture cure urethane, so it should cure faster on skin than on
>metal
>>by sucking water out of your skin. Also supposed to adhere to rust by same
>>mechanism, pulling some of the water chemically bound to rust. Heating a
>>rusty bolt red hot also is supposed to drive off this moisture, shrinking
>>rust so stuck bolt unscrews. since you have to go almost red hot, the
>water
>>must be bound pretty tight.
>
>I find it interesting how much water comes out of a piece of steel when you
>pre-heat it for flame cutting. Even a brand new piece of steel is like a
>sponge holding water. You can see it come to the surface when you run a
>torch over the surface.
>
>Regards,
>
>Grant S.
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