Carburizing
Carburizing is a case-hardening process in which carbon is added to the surface of low carbon steel. Thus, carburized steel has a high carbon surface and a low carbon interior. When the carburized steel is heat treated, the case is hardened while the core remains soft and tough.
Carburizing is the addition of carbon to the surface of low-carbon steels at temperatures generally between 850 and 950°C (1560 and 1740°F), at which austenite, with its high solubility for carbon, is the stable crystal structure. Hardening is accomplished when the high-carbon surface layer is quenched to form martensite so that a high-carbon martensitic case with good wear and fatigue resistance is superimposed on a tough, low carbon steel core. Case depth of carburized steel is a function of carburizing time and the available carbon potential at the surface.
Advantages :
- High quality carburized case can be produced.
- Time consume is also less.
- Production cost is low.
- Heat consume is also less.
- Process is clean.
- Closer quality limits can be achieved.
Disadvantages :
- High labour cost for packing and unpacking
- It is difficult to quench directly from carburizing temperature
- Much time is needed in heating and cooling.
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