High-speed steel (HSS) and tool steel are both types of steel that are known for their hardness and durability. However, it is important to note that high-speed steel is actually a type of tool steel with specific properties that make it suitable for high-speed applications such as cutting tools.    In terms of hardness, both high-speed steel and other tool steels can have similar hardness levels. The hardness of a steel is typically measured on the Rockwell hardness scale, and different grades of both high-speed steel and tool steel can have varying hardness values.   It is important to consider that the hardness of a steel is influenced by several factors such as the specific alloy composition, heat treatment, and the intended application. So, while high-speed steel is generally known for its high hardness, there are many different types of tool steels available, and some tool steels may have comparable or even higher hardness levels than high-speed steel.   Ultimately, the choice between high-speed steel and other tool steels depends on the specific requirements of the application, such as the cutting speed, heat resistance, and wear resistance needed. It is recommended to consult with a materials expert or supplier to determine the best steel for your specific needs.  

Hot work tool steel and cold work tool steel are two types of steel specifically designed for different applications and working conditions. Here are the main differences between them:   1. Working Temperature: Hot work tool steel is designed to withstand high temperatures during the manufacturing and shaping of materials at elevated temperatures (typically above 200°C or 400°F). Cold work tool steel, on the other hand, is intended for use at lower temperatures, generally during the shaping and forming of materials at or near room temperature.   2. Hardness and Toughness: Hot work tool steels are designed to retain their hardness and strength at high temperatures, while still maintaining some level of toughness to resist thermal fatigue and cracking. Cold work tool steels, on the other hand, are optimized for their hardness, wear resistance, and durability at lower temperatures.   3. Application: Hot work tool steels are often used in operations such as forging, extrusion, die casting, and other processes involving high-temperature exposure. They are required to withstand thermal cycles, mechanical stresses, and wear caused by the interaction with hot materials. Cold work tool steels, on the other hand, are utilized in applications such as cold forming, cutting, shearing, stamping, and other operations that take place at or near room temperature.   4. Thermal Conductivity: Hot work tool steels need to possess good thermal conductivity to transfer heat away from the working surface efficiently. Cold work tool steels, however, do not require high thermal conductivity since they are not exposed to extreme temperatures like their hot work counterparts.   5. Alloying Elements: There are various types of hot work and cold work tool steels, each with its own specific composition. However, some common alloying elements found in hot work tool steels include chromium, tungsten, molybdenum, and vanadium, which help improve high-temperature properties. Cold work tool steels often contain high carbon content and additional elements like chromium, vanadium, and tungsten to enhance wear resistance and hardness.   It's important to note that the specific properties and compositions of hot work and cold work tool steels can vary depending on the manufacturer and the intended application. Therefore, it's crucial to consult the manufacturer's specifications and guidelines to ensure the appropriate selection and use of tool steels in each specific scenario.

Many data need to be collected to issue the CBAM. The CBAM consulting charge basis on the HS code Hot Rolled Round Bar 72283090 Grade：1.2080,1.2379, 1.2842，1.2344，100Cr6,  4140,1.2714, Hot Rolled Flat Bar 72254010 Grade：1.2080,1.2379, 1.2842，1.2344，100Cr6  4140 1.2311,1.2312，C45Hot Forged Round bar And Flat Bar  72284000 Grade：1.2080,1.2379, 1.2842，1.2344，100Cr6,4140,C45,1.2344,1.2343,1.2365,1.2367,1.2767,1.3343,1.2714,1.2746,1.2601,1.2316 Hot Rolled Flat Bar 7226 9100 Grade：1.2080,1.2379, 1.2842，1.2344，100Cr6  1.2311,1.2312，C45