Hi!
I need your help regarding cryo treatment parameters for a steel called CRV2/1.2631. As I want to get the finest possible grain, I want a cryo treatment having done with it as a part of the heat treatment. The metallurgy of the steel reads

C - 0.5%
Si - 0.9%
Mn - 0.5%
Cr - 8.5%
Mo - 1.2%
W - 1.2%
Fe - balance

I want a cryo treatment right after hardening/quenching prior to a double or triple temper. Information on the standard heat treatment can be downloaded here: PDF file (http://www.sz-metal.si/center/steels/crv2.pdf).

Any recommendations?

Thanks for your help!!!

Best Regards

Mark23

Here is an other Link with information on the heat treat cycle with a triple temper PDF file (http://www.doerrenberg.de/fileadmin/template/doerrenberg/stahl/1.2631_deu.pdf).

By the way, which parameters would you choose to get the finest grain out of this steel? The tungsten should eat up quite a lot of the carbon when doing a high temperature tempering (aiming for secondary hardness), and the tungsten carbides should be very small ...

Additional info on the geometry: The knife has a length of about 220 mm and is ground from 1/8 stock.

Thanks!!!

Best regards

Mark23