CPM S30V is a martensitic powder-made wear and corrosion resistant stainless steel developed by Dick Barber of Crucible Materials Corporation in collaboration with knifemaker Chris Reeve. [1][2] Its chemistry promotes the formation and even distribution of vanadium carbides, which are harder and more effective at cutting than chromium carbides.[1] These vanadium carbides give the steel a very refined grain, further improving the sharpness and toughness.[3] Despite some difficulties with a consistent heat-treat, knifemakers use CPM S30V because its composition makes it easier to grind than other powder steels although the carbides still wear down the grinder belts considerably.[4] Its composition is as follows: Carbon 1.45%, Chromium 14.00%, Vanadium 4.00%, Molybdenum 2.00%.[1] Barber received feedback from a number of other knife users and knifemakers such as Sal Glesser, Ernest Emerson, Tony Marfione, Phil Wilson, William Harsey Jr., Tom Mayo, Jerry Hossom, and Paul Bos in the development of CPM S30V.