S35VN heat treat question

L

Lo/Rez

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Feb 10, 2013
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From my understanding, the heat treat process for S35VN is....
heat treat - plate quench - first temper - cryo (or sub zero) - second temper
I'm no metallurgist, but wouldn't it make more sense if the process was....
heat treat - plate quench - cryo (or sub zero) - first temper - second temper
 
You can do it both ways from my understanding...
Tempering before sub zero or cyro sometimes lessons the chance of the blade cracking.
The temper is usually about 300 degrees.

Or you can go straight into subzero or cyro than do your tempers.
 
The ''snap temper" must not be high, 250-300 F. Otherwise you prevent some of the transformations.
Try going from plate quench to cryo immediately .That probably will prevent cracking. Don't lay the blade flat on the bottom of the cryo tank it will probably warp. Hang blade vertically in or above the liquid nitrogen.
 
Don't lay the blade flat on the bottom of the cryo tank it will probably warp
Click to expand...

You can say that again! If using a flat tank, having a rack to hold the blade edge down in tank helps LOTS on preventing warp. Listen to Mete on going direct from quench to cyro (LN) or sub-zero (dry ice).

Ken H>
 
Yup, straight from plate quench to dry ice worked for me. Man it's hard to hand sand afterwards though!
 
Same here:
Oven > plates > LN or DI.

If the plates are a bit warm from doing several blades, after removing from the plates I set the blades in a pan of cold water to cool to room temp, dry off, and then put them in the LN/DI.
 
Thanks for the answers/advice. I'm guessing tempering at 375-400 should get around 61Rc?
 
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