Technology / product information

In the machinery and automotive industries, components subjected to high torque or impact loads such as gears and shafts often face severe surface wear. Enhancing surface hardness without compromising the core toughness is key to extending the component’s service life. The Carburizing Process is widely adopted to achieve this balance, providing a hardened, wear-resistant surface while maintaining ductility in the core ideal for demanding mechanical and powertrain applications.

Process Principle
Carburizing is a surface hardening process that diffuses carbon atoms into the steel surface within a carbon-rich gas atmosphere at 800–980 °C. The carbon penetrates the steel’s crystal structure, forming a carburized layer with higher carbon concentration than the core. After rapid quenching, this layer transforms into a martensitic structure, resulting in an extremely hard and wear-resistant surface.

Properties After Treatment
Achieves surface hardness between 650–800 HV.
Provides outstanding resistance to wear, fatigue, and friction.
The martensitic structure strengthens the surface while maintaining toughness in the core.
Reduces the risk of cracking or deformation under repeated impact or heavy loads.

Applicable Materials
The Carburizing Process is suitable for steels requiring a balance between hardness and toughness, including Structural Carbon Steels and Alloy Steels.

Applications & Use Cases
Ideal for high-load and precision components, including:
Gears: Require hard, wear-resistant surfaces.
Bushings and Rolls: Subjected to high rotational forces and surface contact stress.
Spindles: Demand high surface smoothness and rotational precision.
The process supports large components up to 760 × 1230 × 720 mm, making it suitable for both small and heavy-duty production.

Advantages of Carburizing
Increases surface hardness without making the core brittle.
Improves wear resistance and fatigue strength.
Allows controlled case depth based on design requirements.
Applicable to a wide range of shapes and component sizes.

Summary
Gas Carburizing is a core heat treatment process that enhances the surface hardness of steels for superior wear and fatigue resistance. Operating at 800–980 °C, it forms a martensitic surface layer with hardness between 650–800 HV while preserving internal toughness. This process extends component life and reliability, making it indispensable for automotive, machinery, and powertrain applications requiring long-term durability.

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