Usually applied to low carbon steels components where the carbon content is increased at the surface under high temperature environment. Generally, depending on the types of furnaces and the difference of the source of atmosphere, the process can be categorized into:
1.Drip-feed Gas Carburizing: The atmosphere is produced by the decomposition of organic solvents in the furnaces, and it’s monitored through an oxygen sensor to control the carbon concentration.
2.Endogas (Endothermic gas)-type Carburizing: The gas is mixed with the air in advance and then injected into the endothermic gas generator to form the carrier gas. Later on, a hydrocarbon gas is added to enrich the carrier gas. The subsequent carbon concentration is monitored through an oxygen sensor.
3.Vacuum Carburizing: The CmHn gas is decomposed under vacuum environment in the furnace. And the case depth of the parts will depend on the controlling of the furnaces’ temperature and processing time.
Benefits:
• Upon subsequent quenching, the hardness will increase at the surface of the material due to the higher carbon content while the core of the parts will retain its toughness due to the lower content of carbons.
• In addition to the high surface hardness and the bright colors obtained, it will also have the specific microstructures that will increase the wear resistance and impact resistance of the materials.
• For the workpiece treated under vacuum carburizing process, they are especially suitable for deep case-depth carburizing processes. Moreover, since there is no intergranular oxidation in this case, the fatigue strength is also increased.
Category
gas carburizing, vacuum carburizing, carbonitriding, bright carburizing quenching, quenching and high temperature tempering, L-TEC...,etc.