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In 2009, Crucible Steel introduced an update to CPM-S30V to meet the needs of renowned knife maker Chris Reeve that they called CPM-S35VN. The addition of 0.5% Niobium, and reductions in both Carbon (from 1.45% to 1.40%) and Vanadium (from 4% to 3%) produced an alloy with 25% increase in measured Charpy V-notch toughness over S30V (Crucible claims 15-20% improvement).
CPM S30V, [35] on the lower end of the SxxV steels, it has a carbon content of 1.45%. However, S30V is still considered to be a superior choice for knife making. CPM S30V is used in a wide range of commercial knives. CPM S35VN [36] is a martensitic stainless steel designed to offer improved toughness over CPM S30V. It is also easier to machine ...
Schrade Cutlery [47] and Spyderco use 154CM, 440C, D2, S30V, S60V and S90V steel, [48] [49] [50] and Ernest Emerson's knives are hard-ground from differentially heat-treated A2 tool steel. [51] Emerson Knives machines blades from 154CM steel, [ citation needed ] and Mike Snody uses A2, S35V , 154CM and 440C steels.
Very hard steel (e.g. chisels, quality knife blades): HRC 55–66 (Hardened High Speed Carbon and Tool Steels such as M2, W2, O1, CPM-M4, and D2, as well as many of the newer powder metallurgy Stainless Steels such as CPM-S30V, CPM-154, ZDP-189. There are alloys that hold a HRC upwards 68-70, such as the Hitachi developed HAP72.
CPM S30V steel an American powder-metallurgy, high-carbide steel developed for the cutlery market. [19] CPM-M4 (aka AISI M4), usually tempered to 62-65 HRC, a high-speed steel with combination of high carbon, molybdenum, vanadium, and tungsten for excellent wear resistance and toughness; a powder-metallurgical, non-stainless steel.
A variety of hardness-testing methods are available, including the Vickers, Brinell, Rockwell, Meyer and Leeb tests. Although it is impossible in many cases to give an exact conversion, it is possible to give an approximate material-specific comparison table for steels .
Mohs hardness of materials (data page) Vickers hardness test; Brinell scale This page was last edited on ...
While similar to S30V, S35VN is an incremental improvement in which Vanadium is used to make sharpening easier and increase toughness and Niobium to increase toughness and further refine uniform grain formation. Rockwell Hardness is still at 58-59 HRC and edge retention is not much different from S30V.