Hi. I had a designe for a knife, and it incorperated the pry head of a crow bar as the butt of the knife. I had been making it for about a month, and then I got to the heat treating. Saddly the knife broke during this process. That stuff is hard! We didn't even get it up the the critical temperature when we put it in the water to treat it, but it broke anyway. Usually we heat treat in oil, but were experamenting with a salt water. This was also an old Crow bar. Probably made in America:D So my question is do any of you know what metal it might have been made from, and if so how do you harden that metal. We were thinking that it might have been an air hardened steel or something. Any info on this is going to help with my next attempt. Thanks.