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[[Victorinox|Forschner/Victorinox]] make inexpensive kitchen knives; high-end manufacturers include [[Wüsthof Dreizack|Wüsthof]], [[Global (cutlery)|Global]], [[Henckels]], [[Kershaw Knives]] and Böker (Tree Brand).
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Knife blades are typically made of [[steel]]. All knife steel is tempered [[martensite]], which means that a fine-grained crystal structure with lattice irregularities that make it hard. It is formed as it is [[quench|quenched]], changing it from the [[austenite|austenitic]] structure that it has at high temperature to a hard, but brittle martensitic structure. The blade is then [[tempering|tempered]] by heating to an intermediate temperature for a period to make it less brittle. Knife steel has fairly low nickel content, because nickel tends to keep steel in the austenitic structure, even when cold. Steels having high carbon but low chromium content ("carbon steel") are prone to rust and pitting if not kept dry and oiled.
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