TIN is a general-purpose PVD coating with high cost-performance ratio and stability, enhancing tool hardness and withstanding high oxidation temperatures. It is used on high-speed steel cutting tools or forming tools for excellent machining results. The iron nitride coating and its sintered bodies have a satisfying golden yellow color, making them suitable as decorative materials with good gold-like effects and decorative value, as well as corrosion resistance and extended product lifespan.