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Single-quench hardening Single quench hardening is a special case hardening process. It is suitable for steels that tend to form coarse grains during carburizing or for components that still require intermediate machining before hardening. In this process, the steel is cooled slowly after carburizing. Covering the areas not to be cased, with copper plating or a layer of commercial paste, allows the carbon to penetrate only the exposed areas. Another method involves carburizing the entire part, then removing the case in selected areas by machining, prior to quench hardening. 2018-10-25 Case hardening is the process through which metal surface is strengthened by covering the surface of the workpiece by the layer of another harder material and this layer is more durable. Case-hardening is regarded as thermomechanical treatment to modify the surface properties of gear-teeth. It employs thermal diffusion to incorporate nonmetal or metal atoms into a material surface to modify its chemistry and microstructure. Precision case hardening for high volume manufacturing UniCase Master®– the technology which challenges conventional case hardening methods The UniCase Master® (UCM) is a new approach to reduce the distortion of gears in continuous production that challenges conventional case hardening methods with a single flow, precision case hardening Hardening causes distortions in the metal, which must be corrected with additional machining. As parts are machined after hardening, internal stresses can be relieved leading to distortions which require extra stock to accommodate and negating some of the benefits to roughing in the annealed condition. 2014-11-5 Carburizing steels for case hardening usually have base-carbon contents of approximately 0.2%, with the carbon content of the carburized layer generally being controlled at between 0.7 and 1% C (Ref 2). However, surface carbon is often limited to 0.9% (Ref 3) because too high 2019-2-25 Measuring Case Depth Hardness . Engineering Applications and Design Engineering Materials. Methods of Measuring Case Depth Hardness. Case hardening may be defined as a process for hardening a ferrous material in such a manner that the surface layer, known as the case, is substantially harder than the remaining material, known as the core. Case Hardening. On low carbon steel parts (1213, 12L14, 1117, 8620, etc.) specify case depth and hardness that is required. Specified case depth should have a tolerance of .005 min. On ground parts case depth is assumed to be after grinding, but adding "after 
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