AEB-L Rc question

KenH said:
Warren, it sounds like you've got S35V dialed in pretty good. How do you heat treat S35V? From the S35V MSDS sheet: "Recommended Heat Treatment:Austenitize 1950°F (1065°C). Quench to below 125°F (50°C).Double temper at 600°F (315°C) 2 hrs. minimum each temper.Cool to hand warm between tempers. A freezing treatment maybe added between tempers. Aim hardness: 58-61 HRC"

That's always seemed wrong to me - to me, it seems like the -95ºF should be right after quench, then tempering.

Comments please -

Ken H
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I go into the dry ice first, then two 400f tempers for 2h each. Make sure the blade is straight while it is still air cooling. I find it nearly impossible to straighten at 400f overclamped in a temper cycle. I know some recommend full cryo, but I've also heard that any eta carbides formed in cryo will not survive tempering. I'm still researching this, but its on the backburner as I'm doing several runs of kitchen knives in W2 right now, and its taken me the best part of the past couple months as a hobby maker. The end is in sight though. :35: Just 6 steak knives left.
 
here is the link to Sandvik 13C26 and 12C27 info and heat treat http://www.smt.sandvik.com/en/materials-center/material-datasheets/strip-steel/sandvik-13c26/, http://www.smt.sandvik.com/en/produ...teel/hardening-guide/the-hardening-procedure/, http://www.smt.sandvik.com/en/materials-center/material-datasheets/strip-steel/sandvik-12c27/, http://www.smt.sandvik.com/en/produ...ife-steel/hardening-guide/hardening-programs/. the recommended temperature is 1975F, but with 3/32" material, the soak is only 5 minutes followed by oil quench, when cool to touch, soak in dry ice/solvent for 5 minutes or so, temper at 300F for an hour and you are ready to test. the sandvik references give lots of information to build your own recipe.
 
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