Cryo. Before or After Snap Temper?

[rincan]

I am using CPM-S35vn and was wondering if I should cryo before temper or do a snap temper first? Ive heard the second minimizes cracks but I wanted to be sure.
Thanks in advance

 

[SBuzek]

I go straight from quench plates to LN. No snap temper.

 

[rincan]

ok thanks! follow up. how long do you cryo for?

 

[SBuzek]

If your doing cryo with LN recommended 6 hours. I usually H/T late in the evening and then just leave them in over night.Take them out the next morning and let them come to room temp and temper.

 

[rincan]

Ok great! What if i did a sub-zero treatment instead with dry ice?

 

[SBuzek]

With dry ice all you really need to do is get the whole blade down to temp.Usually 30 minuets to and hour is good.