Excerpt from Tool-Steel: A Concise Handbook on Tool-Steel in General, Its Treatment in the Operations of Forging, Annealing, Hardening, Tempering, Etc, , And the Appliances Therefor

In many cases tool-steel is still more closely designated according to the smelting processes from which it has resulted, such as ingot-steel, weld-steel or according to the method of production, such as Bessemer steel, Martin steel, crucible steel, puddled steel, shear steel, etc., further accord ing to certain peculiarities, such as natural or self-hardened steel, hard-centred steel, soft-centred or mild-centred steel, tungsten-steel, chrome-steel, nickel-steel, etc, and finally, according to the purposes to which it is to be applied, such as knife-steel, scythe-steel, magnet-steel, punch-steel, chisel steel, etc.

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