Case hardening is a heat treatment that combines the ductility of low carbon materials with the strength of high carbon through the creation of a tough outer coating which surrounds a softer more malleable core. Unlike other coating and plating techniques, case hardening actually penetrates the surface of the base material providing a gradual transition from high carbon content to low.
Quick links to Case Hardening Information
Applications of Case Hardening
Also known as surface hardening, case hardening can be applied in various applications. Industries such as construction, fencing, machining, grating, and metalworking commonly utilize case hardened steel and iron components, as they provide reliable parts and improve product longevity under extreme stresses.
Screws, grates, bolts, engine camshafts, firing pins, theft prevention systems, chains, metal panels, and doors undergo this particular type of heat treating to resist cutting or shearing while remaining less brittle than untreated high carbon materials. Most often these parts are shaped before hardening, as it reduces machining opportunities due to the heightened strength and rigidity.
Case Hardening Process
Although the results of nitriding and boriding heat treatments may differ slightly from that of carburizing, the processes are quite similar. The steel or iron worked piece is placed inside what is known as a carburizing pack. Essentially, this is an encasement tightly filled with carbon-based compounds.
The part and its pack are then put inside a hot furnace and heated to high temperatures, usually between 482 and 955 °C ( 900-1,750 °F) depending upon materials, thickness, desired hardness, and corrosion resistance. The duration and temperature of this heating determines the depth to which the hardening extends beyond the surface of the substrate. Typical depths are around 1.5 mm, at which point carbon content tapers down.
While this is the traditional and most common technique used for case hardening, it is not the only one. Alternative methods abound and are growing in popularity. One such technique is to heat the parts in a carbon-rich atmosphere, such as a methane-rich furnace. The carbon from the air will create a thin protective layer. Additionally, steel and iron components can be heated repeatedly with a torch and then quenched in a carbon-rich medium. This is most effective for smaller parts, as it is often capable of less penetration than furnace based methods. As homogeneous steels with low or high carbon content are now more readily available, case hardening is used less frequently, though these uniform metals cannot match the combination of extreme hardness and toughness provided by case hardened parts and materials.
Notable Types of Case Hardening
While carburization, or the diffusion of carbon into a metal, is the most commonly used type of case hardening, nitriding, and boriding are also used and involve nitrogen and boron diffusion. With each technique, high temperatures diffuse the material, after which the surface layer is treated to attain the desired hardness.