Depending on the steel cryo can give you an extra point or two in hardness. More than anything else, I feel that cryo gives more toughness to almost any alloyed steel.
Cryo could be cost effective for you by using that freezer along with kerosene and dry ice - cost effective being defined as maybe $20 per knife at a guess. LN would be cost effective only if you already owned some type of suitable container for it and if you have a welding supply or medical supply nearby where you could get the LN. I have a $900 Dewar (15 year old price) that costs about $75 to fill and lasts about 6 months after making some careful mods to its storage situation (3 months without mods). You'd have to decide for yourself whether or not that could be cost effective for your situation ...
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