Colophon

The mission

It covers the whole field: the blade steels and the metallurgy behind them, how a knife is built and heat-treated, the blade shapes and what each one is for, the anatomy of a knife from tip to handle, and how to care for and sharpen what you own.

The project starts from one conviction: this subject deserves a reference that neither oversimplifies nor assumes you already know the jargon. So the site is built in layers. The steel comparison index gives the panoramic view; each deep-dive entry goes as far as the sources allow; every technical term is explained the first time it appears; and everything cross-links, so you can follow a thread from a steel to the shapes and makers that use it.

What actually makes a knife

A good kitchen knife is not one decision but four, working together. The steel is the alloy: the recipe of iron, carbon, and other elements. The heat treatment is how that alloy is hardened and tempered, and it matters as much as the steel itself, because two knives ground from the same steel can perform completely differently depending on who heat-treated them and how. The geometry is the grind, the thickness behind the edge, and the sharpening angle. And the handle is what your hand negotiates with all day.

Marketing tends to collapse all four into a single brand name, as if "a knife from Brand X" told you what you needed to know. It does not. Worse, the naming itself is slippery: a steel's trade name, its actual alloy, and its heat-treatment process are three different things that routinely get treated as one. FRIODUR, for instance, is not a steel at all but an ice-hardening process applied to a base steel like X50CrMoV15; FC61 is a trade name for the Sandvik alloy 13C26; and a knife sold as "440 stainless" is almost never the premium 440C. This site keeps those layers apart on purpose, and the Construction section is where they get pulled fully into the open.

How this site is written

Every page is written to stand on its own. A reader who lands here from a single link, with no prior context, should be able to read the page through and understand it. Jargon is explained the first time it appears, whether with a short clause, a parenthetical, or a hover definition for a term that would otherwise interrupt the sentence. You should never need a second tab open to a glossary.

Entities cross-link throughout, so one thread can take you from an alloy to the blade shapes it suits, the makers who use it, and the care it needs. And the makers featured here are artisan and boutique smiths first. Big production brands appear only where one is genuinely the right example, because the craft side of this world is where the most interesting work happens and it is chronically under-documented.

A growing family

This site is one of a growing family of A-to-Z references for the deeply curious, each applying the same method (built in layers, jargon explained, everything cross-linked) to a subject that rewards going deep. The first sibling is the Mexican Spirits Bible, which does for mezcal, tequila, sotol, and the rest of Mexico's distilled spirits what this site does for knives. More are on the way, and they all link to one another, so following your curiosity from one to the next is part of the point.

Acknowledgments

This site stands on the work of the people who actually study and make these things. On the metallurgy, it leans heavily on Larrin Thomas and the research he publishes through Knife Steel Nerds, the best public source on how knife steels and their heat treatments really behave, alongside published CATRA edge-retention testing and the datasheets from the steel mills themselves.

Most of all it owes a debt to the artisan makers, and to the wider knife community that documents, argues about, and preserves this craft in the open. Every recommendation here points back to them.