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Main Boards => Hunting Knives and Crafters => Topic started by: DANA HOLMAN on March 30, 2009, 11:01:00 PM

Title: heat treating question
Post by: DANA HOLMAN on March 30, 2009, 11:01:00 PM

Guys
I'm using a mini one brick forge to heat my knives,with two propane torches. what i have noticed is that when i pull the blade out of the forge, the knife forms a black film on the blade as soon as it hits the cooler air, inside the forge the blade looks clean,
can anyone tell my what is going on
thanks for your time
dana  :banghead:

Title: Re: heat treating question
Post by: Caveman IL on March 31, 2009, 08:28:00 AM

Could you post some pics of your forge or details of constr. Larry

Title: Re: heat treating question
Post by: Jeremy on March 31, 2009, 10:13:00 AM

If you've got that mini forge buring properly now there's very little free oxygen in the chamber and you're keeping scaling to a minimum.  As soon as you take it out of the chamber you're exposing it to lots of oxygen and it starts to form scale.

Title: Re: heat treating question
Post by: DANA HOLMAN on March 31, 2009, 11:22:00 AM

Thanks Jeremy
thats kinda what i thought, but i was not sure, i should have my new forge next week and will post it for all. just hope it works.
dana

Title: Re: heat treating question
Post by: Talin342 on March 31, 2009, 12:24:00 PM

So is scaling a bad thing or just something you have to deal with?

Title: Re: heat treating question
Post by: DANA HOLMAN on March 31, 2009, 12:48:00 PM

well i guess there is nothing wrong with it, you still have to clean off you blade.
dana