GB

GB is the abbreviation of China’s national standard for tool steels (Guobiao Standard). It is formulated and implemented by the State Administration for Market Regulation and the Standardization Administration of China, covering multiple series such as cold-work die steel, hot-work die steel, high-speed steel, and stainless tool steel. The GB standard strictly regulates the chemical composition, mechanical properties, heat treatment processes, etc., of tool steels to ensure stable product quality and traceable performance. China’s GB tool steels are renowned for their complete specifications, high cost performance, and sufficient supply, and are widely used in industries such as mold manufacturing, mechanical processing, automotive, mining, and energy.