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Steel carburizing: wear-resistant surface and tough core
Carburizing is a thermochemical treatment used to improve the mechanical performance of steels in applications where high surface resistance needs to be combined with core toughness. The process involves enriching the outer layer of the material with carbon during heating, creating a differentiated structure between the surface and the core.
This results in components with a very hard surface capable of resisting friction and wear, while the core retains a greater ability to absorb impact and mechanical stresses. At T.T.N. S.p.A., carburizing is defined according to the type of steel, the geometry of the component, and the actual operating conditions it will be exposed to, with parameters calibrated to ensure consistent, repeatable results.
It is particularly suitable for components that must operate under critical conditions, where the combination of wear resistance and balanced mechanical properties is essential.
Hard surface, tough core: the balance achieved through carburizing
The main advantage of carburizing is that it creates a component whose properties differ between the surface and the core.
In particular:
- the surface achieves high hardness and wear resistance
- the core maintains toughness and the ability to absorb mechanical stresses
This balance is essential for components exposed to friction, wear, and cyclic loads, where uniform hardness could increase brittleness and the risk of failure.
Carburizing therefore helps improve the component’s service life, even under demanding operating conditions.
T.T.N.
Common carburizing applications
Carburizing is used whenever the surface of a component needs to be protected without compromising its structural performance.
In these applications, a hard surface layer helps reduce wear and extend the component’s service life, while maintaining reliability and impact resistance.
Gears
Alberi di Transmission shafts
Wear-prone components
Moving mechanical parts
T.T.N.
Reliability Forged in Every Treatment
When to choose carburizing
Carburizing is suitable when the component needs to:
- resist intense surface wear
- withstand dynamic loads and cyclic stresses
- maintain good impact resistance
It is particularly suitable for low-alloy and alloy steels, which can be treated to achieve an effective balance between surface hardness and core toughness.
The choice of this treatment always depends on the component’s final use. Under complex operating conditions, carburizing makes it possible to achieve a more balanced performance than treatments that act uniformly throughout the full volume of the material.
Carburizing and complementary treatments
Carburizing is often combined with other treatments to further optimize component performance.
In particular:
- it can be followed by a hardening cycle to further enhance the resistance of the surface layer
- it can be combined with surface coating, such as PVD coating, to improve wear resistance and service life
This combination makes it possible to obtain high-performance components both at the surface and in the core, adapted to the most demanding operating conditions.
