Case depth
The case hardening depth is the thickness of the layer in which a defined minimum hardness is reached when a workpiece is cooled after case hardening. It influences the hardness distribution and the structure of the material.
Physical-Chemical Mechanism of Action
After case hardening, a layer with increased hardness is formed in the material, extending from the surface inward. The depth of this hard layer depends on the hardening conditions and the material.
Metallurgical Relevance & Risks in Welding
A case hardening depth that is too shallow can lead to insufficient hardness in the weld zone, which impairs the toughness and resistance level of the material. Too deep a case hardening can lead to crack-sensitive structures and increased stress buildup, increasing the risk of cracks.
Workshop Practice & Instructions
To achieve an optimal case hardening depth, the cooling time after case hardening should be precisely controlled. A typical case hardening depth for many steels is about 0.5 to 1 mm. For special materials or hardness requirements, this depth can vary and should be observed in the respective material manual.