Carburizing for large-sized parts

Standard – UNI 5381
Typical Materials – Steels such as 20MnCr5, 20NiCrMo2, 18NiCrMo5, etc.
Achievable Metallurgical Characteristics – Surface hardness ranging from 55-65 HRC
– Effective treatment depths from 0.10 to 3.00 mm

Carburizing (or case hardening) is a process typically applied to finished parts after major mechanical and machining operations. It is often necessary to perform a grinding phase after carburizing.

Carburizing allows components to achieve high surface hardness while maintaining good core toughness. The treatment is typically used for shafts, gears, pinions, and any other mechanical component subjected to both wear and flexural and/or tensile stresses.

The process involves heating to austenitizing temperatures, typically between 850-950°C, in an environment that promotes surface carbon enrichment. By varying the duration of this state, the depth of carburizing can be controlled according to the drawing specifications. Austenitizing is always followed by quenching through rapid cooling in oil to achieve microstructural stability.
A subsequent tempering process is performed at temperatures ranging from 120-250°C depending on the surface hardness required.