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Case-hardening or carburization is the process of introducing carbon to the surface of a low-carbon iron, or more commonly a low-carbon steel object, in order to harden the surface. Iron which has a carbon content greater than ~0.02% is known as steel .
Color case hardening is the predecessor of all metal coloring typically employed in the firearms industry. Contemporary heat-treatable steels did not exist or were in their infancy. Soft, low-carbon steel was used, but strong materials were needed for the receivers of firearms. Initially case hardening was used but did not offer any aesthetics.
Cimarron was the first firearms company to offer antique finishes on modern made firearms, such as charcoal-bone case hardening. [3] [5] Some finishes are applied in Europe prior to import, and some are applied to bare frames and barrels upon arriving in the US. [3]
This also inversely affects the depth of the case; i.e., a high carbon steel will form a hard, but shallow case. [14] A similar process is the trademarked "Nu-Tride" process, also known incorrectly as the "Kolene" process (which is the company's name), includes a preheat and an intermediate quench cycle.
Personally made firearms that fire one shot at a time are legal, as is 3D printing certain guns as a hobbyist. But further manufacturing faces a key legal test in October when the Supreme Court ...
The company used to maintain an "Old Armory Custom Shop" which produced custom firearms to order. These firearms featured expensive traditional materials and techniques such as engraving or hand engraving, gold inlay, damascening, case hardening, polishing, and fine metal plating, or other finish.