CPM S30V is a martensitic (hardened) powder-made (sintered) 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.
CPM S30V steel is considered a premium grade knife steel so expensive that it strongly affects the price of the knife, and is largely used in higher end production, bench made and custom knives. Buck Knives calls it "the absolute best blade steel available".[5] Joe Talmadge claims it might be the ultimate high-end all-around stainless steel, due to high performance coupled with easier machinability and sharpenability than the other steels in this class.[6]
[edit] properties
[edit] composition
[edit] physical properties
| Elastic Modulus |
Density |
| 32 X 106 psi |
0.27 lbs./in3 |
| (221 GPa) |
(7.47 g/cm3) |
Coefficient of Thermal Expansion
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°C |
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[edit] mechanical properties
[edit] References
