Tenifer

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Tenifer is a trademarked name for the end result of a chemical bath nitriding process that embeds nitrogen into an iron-containing alloy to create a corrosion-resistant finish that is a dull grey in color and extremely hard. The generic term for this type of process is carbonitriding. Other trade names for carbonitriding include Melonite, Sursulf, Arcor, Tufftride, and Koline.

*Glock, an Austrian firearms manufacturer, utilizes this process to protect the slides of the pistols they manufacture. The Tenifer finish on a Glock is the third and final hardening process. It is 0.05 millimeters thick and produces a 64 Rockwell C (diamond cone) hardness rating via a 500 °C nitride bath. The final matte, non-glare finish meets or exceeds stainless steel specifications, is 85% more corrosion resistant than a hard chrome finish, and is 99.9% salt-water corrosion resistant. After the Tenifer process, a black Parkerized finish is applied and the slide is protected even if the finish were to wear off. Several other pistols also use this process including the Walther P99 and Steyr M/S series.