surface hardening

Surface hardening is a process that makes the outer layer of a metal, like steel, much harder while keeping the interior softer and more flexible. This is achieved by heating the metal and then cooling or treating its surface, creating a hardened shell that resists wear, scratches, and deformation. The main goal is to improve the durability of parts that experience frequent friction or contact, such as gears or cutting tools, without making the entire piece brittle or difficult to machine. This process enhances the metal’s performance and lifespan in demanding environments.