M
Mathsr
Guest
This is a 4.25 in blade hunter made of 1/8 inch CPM M4 steel. It is flat ground and hand polished. The bolsters and bolts are stainless steel and the handle is made of ash. It is going along with us to the Blade Show.
The heat treatment wasn't bad at all. It is about the same as S30V. I heat treated it prior to grinding the bevels on the blade. It is thin and I wanted to avoid any chance of warping.
The grinding went slow but it was not as bad as I thought it would be. A 60 grit belt doesn't leave very deep scratches in it at all. (I don't think anything is going to scratch this stuff very much.) I have never seen anything smooth up a new belt like this stuff does. M4 is not going to be the steel of choice for the maker who is faint of heart. I polished an S30V blade and a D2 blade after the M4. The S30V blade was easy in comparison and I was amazed at how quickly I finished it. With the D2...I wanted to check the D2 with the Rockwell tester just to make sure it had been hardened.
M4 seems to be the most wear resistant steel we have used. I think it will make one heck of a knife, but they aren't going to be cheap. There is just too much time and too many belts involved in getting the kind of finish on it that we like. I think that M4 will be more of a specialty steel. With steels like CPM S30V, CPM 3V, and CPM 154 out there that do a great job at a lower cost, you would really need the combination of extreme wear resistance and toughness to go to the effort and expense to use M4 IMHO.