The pack chromizing surface of high-carbon sintered steels especially show clean surfaces with low friction coefficient during tribological testing. First of all, it pays to enrich the high-carbon sintered steel extremely, outstanding anti-corrosion properties by a high concentration chromium diffusion layer with an iron-chromium carbide complex coating by pack-chromizing. At the first attempt, the reason of the low friction coefficient made up a ‘Dimple’ and at the same time it has to compose a high hardness carbide for a frictional coefficient decreased up to near 0.1. However, more specific inspections depend on the binding or unbinding chloride compound when there are the coated specimens analyzing the chromium coating surface diffused pack-chromizing as a functional parameter, temperature, and gas atmosphere. The low friction coefficient was attempted to be determined by X-ray diffraction, EDAX, XPS analysis. The pack- chromizing coated sintered-steel can control a low friction coefficient phenomenon by the concentration of binding or nascent state chloride on the coating layer.