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Ok.. here is a list of familiar knife steels. The asterik next to some refer to those that are multi task steels, both carbon, alloy and stainless that are used if other applications than just knife steel.
O1*, O2*, A2*, D2*, S7*, W1*, W2*, 440series stainless' A,B,C *, AUS-8, CPM-S30V, CPM S90V, 154CM, ATS34, BG42, 4140*, 4142*, 4145*, 1095*, 1018*, 300 series stainless (303,304,305,316 are used in knife parts, but not blades because they do not heat treat but will work harden when you least expect it. Just ask Bill) A36 is a good carbon mild steel for making other parts, High Speed Steel used in tooling is sometimes used by some makers for it's hardness. Sandvik series 12C27 is an example of a designer steel that is easy to machine in the annealed state, but is tough as hell when hardened which explains the manufacture of machining tools using this material.
Those that like a challange there is also Inconel. This is one of those steels that will belittle the best machine.
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