Introduction
Gas nitriding is a thermal diffusion process that increases the surface hardness of steel components without raising the carbon percentage. Gas nitriding involves the introduction of nitrogen atoms into the surface layer of steel components. This improves the surface properties of the steel and increases the wear, fatigue and corrosion resistance of the steel. Gas nitriding delivers a wide range of surface finishes, from light gray to black, depending on the specific application and the steel grade.
Process Description
Gas nitriding is a diffusion process that is performed in a furnace at a temperature above 500°F. The steel components are placed in the furnace and heated to the desired temperature. Nitrogen-rich gases such as ammonia, nitrogen or propane/ammonia mixture are introduced into the furnace and compound with the surface atoms of the steel components. As a result, the nitrogen atoms are embedded into the surface of the steel components, increasing the surface hardness. The process is typically complete in 24 to 48 hours, and the steel is usually air cooled.
Benefits of Gas Nitriding
Gas nitriding is an ideal surface treatment for steel components due to its low cost and ease of implementation. Gas nitriding does not require the use of special tools or equipment, thus eliminating the need for complex and costly maintenance. Furthermore, the process does not require any additional processing such as cleaning or grinding after gas nitriding. Finally, gas nitriding has been found to increase the wear, fatigue and corrosion resistance of steel components.
Applications
Gas nitriding is used to improve the surface hardness of steel components such as gears, shafts, valve seats, engine blocks and transmission components. The process is especially beneficial when applied to components in automotive, agricultural, aerospace and oil and gas industries. Additionally, gas nitriding is also used to increase the wear and corrosion resistance of roller bearings, roller chains and cams.
Conclusion
Gas nitriding is a simple and cost-effective way to increase the surface hardness of steel components. The process involves the introduction of nitrogen atoms into the surface layer of the steel components, resulting in increased wear, fatigue and corrosion resistance. Gas nitriding is used to improve the surface hardness of steel components in a wide range of industries, from automotive to aerospace.
