TIN is a general-purpose PVD coating with high cost-performance and stability, enhancing tool hardness and offering high oxidation resistance. This coating, when applied to high-speed steel cutting tools or forming tools, yields excellent processing results. The iron nitride coating and its sintered bodies exhibit a satisfying golden yellow color, making them suitable as substitute gold decorative materials with excellent gold-like effects and decorative value, as well as corrosion resistance and extended lifespan of the articles.