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Mass Flow Controllers For Gas Control In Case Hardening Processes

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Mass Flow Controllers For Gas Control In Case Hardening Processes

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System case hardening is a high temperature, batch furnace process in which gaseous hardening agents (a carbon monoxide/hydrogen mixture generated in an endothermic gas generator) are cracked on the steel surface to produce carbon that then diffuses into the microstructure of the steel, raising the carbon content (up to ~0.9% C) of a surface layer and hardening it relative to the tough, ductile core. The surface layer thickness ("case depth") depends on process temperature, composition of the carbon source, time-at-temperature, and the carbon chemical potential at the surface during diffusion

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