Thanks!

J

JamesBro

Joined
Aug 21, 2012
Messages
231
I wanted to say thanks to the contributors to the wealth of heat treat info on this site. As a Rookie to blade making but not afraid to try anything, I bought an Evenheat k18 and spent an evening reading old posts.

This weekend I heat treated a 440c paring knife for practice and a D2 big knife next. From my test files it seems the little knife ended at 59 or 60 and the big knife 60 to 61. I used a paint thinner dry ice mix on the D2.
The only bump in the road was how fast the quench plates worked....never did catch anything around 125f before the next step. But I have unwarped, clean, hard knives!
.
thanks again, you know who you are!

James
 
440c knife was in tool wrap and in for heatup to 1400 and hold for 10 minutes. Ramp up to 1875 and soak for 20.
Take out and onto cold aluminum quench plates, I just leaned on the plates for about 5 min but the little knife was allready cold, so into the preheated toaster oven for the first temper for 2 hours @ 300. Let it cool to room temp and then back into the still warm kiln for another 2 hrs @ 300.

Large D2 knife was the same routine but the first hold time at 1400 was 15 minutes, the final soak was 1850 for 35 minutes and onto the quench plates with about 40 lbs of weight on top. Checked in a few minutes and the knife was warm but not much warmer than room temp...maybe 90 degrees. Cut open the tool wrap and into the dry ice slurry for 35 minutes while the kiln cooled off. Tempered twice @ 450 for 2 hrs each with a cool down in between.

The Evenheat was easy to program and use and next time I will be ready for the quench plates fast work. The plates stayed cold throughout and you could see the heat move through from the frost melting to condensation while quenching.

I wish I had a rockwell tester but guestimated before and between tempers with my test file. Fascinating process...

thanks,

James ( my wife likes her test paring knife and did not want me to break it in half)
 
Sounds like you have the process down well. Kudos for reading and checking as you learn.
 
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