Can you re HT O-1 if you overshoot the temper?

G

gixxer

Joined
Sep 21, 2006
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I did not check the rest of the the program on my kiln, I cooked the blade @1490 (I just picked a random number to stay away from going over 1500), the first temper was 400, and at the tail of the end of the second temper the kiln was ramping up full speed, it was at 525 when I went to pull the blade. It probably started ramping during the last 5 minutes maybe.

Can I cook it again? I figure 525 is about a 56 or 57 maybe. the piece is a small steak knife/parer.
 
Yes you can re-HT but if the problem was only for 5 minutes perhaps little damage was done.
 
Well that's good to know. Even though like you said there might be little damage I wanna do it right. I have had the kiln running for a week now and I have yet to produce a workable (STRAIGHT!) piece of steel. I have learned quite a bit over the past week though.
 
gixxer said:
... and I have yet to produce a workable (STRAIGHT!) piece of steel.
Click to expand...


A few more questions if you don't mind....


What are your grinds at prior to HT?
Are you normalizing?
What kind of quench set up are you using?
 
I am not grinding any bevels at all, only filing the plunge, drilling holes, and profile. I am plate quenching, do not need to normalize cause I am using flat ground stock for stock removal. I think my problem with the stainless was not getting the blade cooled evenly when going into cryo (dry ice). First try I had two big clocks of dry ice, sandwiched the blade between em. Had problems getting it situated and the blade sat on one side for a min. Second time I used rubbing alcohol and it froze solid before I could get it into what I thought was slush. Could not see this cause of the vapor, let it sit overnight apparently on one side.The blades were flat out of the plates and it was after cryo they came out warped. My next plan is to get pellets instead of a block, and pour in the alcohol while situating the blade at the same time so I know I will get the blade submerged, and everything should cool down evenly. Or it could also be me taking 30min to pry the stuck foil off both blades. Got that problem solved BTW...

When I set the hot steel on the plates I close the jaws as fast as I can so the blade does not sit on one side too long.

I cooked a piece of O-1 just to see if I could get a blade cooked and tempered without the warp, and produce a finished knife. I have to have SOMETHING to show for this massive electric bill from firing the kiln so many times this month.
 
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