O1 heat treating in new oven

C

Crow42077

Joined
Nov 9, 2015
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4
Hey Gents, new guy question,.. I just built a heat treating oven with a kanthal element, which works great... but when I heat treat O1 I've been preheating to 1300F for 15 mins then ramping to 1500F and soaking for 30 mins before quenching. When I do this I end up getting a lot of blade anomalies. It almost looks like a damascus etch on the surface maybe .040" deep but totally random. I had a friend tell me that it's possibly carbon forming on the blade during austenitizing. He also recommended using stainless foil to wrap the blade in during heat treat. Anyone else ever have this problem and will wrapping with the foil stop it? I'm trying to figure out if my oven element didn't oxidize long enough, or if I possibly contaminated my oven.
Thanks ahead of time,
Crow
 
I believe most people tend to use the Brownell's anti-scale compound, haven't tried it myself but I've seen it mentioned a lot here.


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I've also read about people using a) thinned-down satanite or b) a mixture of boric acid and red iron oxide (about 80/20) with decent results but the Brownell's stuff is pretty cheap at around $15


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I not sure how finished your blades are before HT I finish my flats pretty fine . Try lowering down to 1250 and soak for 5 min and drop you temp to 1490 for 20 min . I think this might help . My blades don't get much like you describe and I know this temp works . Assuming your over is correct . I remember when I used to try and heat treat in my old forge I would get the look you described and was told it was from overheating . Good luck
 
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