I have two blades I made a while back and I cant remember what steel is in each blade. I do know that one is cpm s30v and one is cpm s35vn, I just dont know which is which. Looking at the Crucible data sheets the heat treatment for these steels appears to be very similar. I plan to send these blades to Peter's . They do have a way to tell what kind of steel it is but it is expensive. Im wondering if I could call both knives one steel or the other and let them heat treat both the same way. These knives will not be for sale.