Infi steel?

I was wondering are all busse knives infi steel?

In short, yes.

INFI is pretty much Busse Combats product.
Check out their website they talk all about it.
Direct quote from their website "INFI is a proprietary steel and heat-treat protocol developed by Busse Combat Knife Co. It is ONLY available through Busse Combat."
 
There were some made out of A2 if I am not mistaken but I think that currently all of them are made with INFI. More experienced hogs will probably provide more details. Besides you can check there: http://www.bussecollector.com/catalog/ if you need some info on a specific model.
 
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