Gas nitriding treatment is a treatment method for the product to be put into a furnace with a mixed gas environment including SM・N₂・CO₂, raising the temperature to 530～600℃, carbon infiltration with a decomposed C component. from CO₂, causing the formation on the surface of the product with a 5～20μm permeable layer created by carbonization of iron.
The intimately formed absorbent layer has high hardness and good bearing capacity, improving the wear resistance of the product surface. Furthermore, because the surface is covered with a deep permeable layer, it improves the corrosion resistance. The surface hardness achieved depends on the type of steel, with ordinary steel materials, the surface hardness reaches HV400-600, the highest achievable hardness is HV900.
With this treatment method, the processing material does not need to be high-nitrogen steel, this method can be used for many types of steel from low carbon steel, alloy steel, cast steel, calcined steel. (however, not compatible with stainless steel materials). In addition, because it is treated with a temperature below the temperature that changes the product’s shape, there are less errors in deformation and warping of the processed product. When compared with the Isonite treatment (a type of treatment similar to gaseous nitriding), the depth layer formed is more intimate, with a cleaner appearance.
Our company has 2 different types of furnaces, well furnaces (well furnaces) and the product will be cooled in the furnace after nitriding; chamber furnace (chamber furnace) is oil cooled, so that suitable processing can be done for each product type.