Tool steel round bar D2 is a type of high-carbon, high-chromium steel that is widely used in the production of cutting tools, dies, and punches. It is known for its high hardness, wear resistance, and excellent dimensional stability.

D2 tool steel is an air-hardening steel, which means that it is hardened by cooling it in air instead of quenching it in oil or water. It contains about 1.5% carbon and 12% chromium, which give it excellent wear resistance and hardness.

Tool steel round bar D2 is commonly used in manufacturing processes that require high levels of wear resistance, such as blanking and forming dies, cutting tools, gauges, knives, and punches. It is also often used in applications that require high levels of toughness, such as cold work applications and high-stress environments.

When working with D2 tool steel, it is important to use proper safety precautions, including eye and ear protection, as well as gloves and other protective gear, as the steel can be quite hard and brittle. It is also important to keep the steel cool during machining and to use appropriate cutting tools and lubricants to prevent damage to the steel and the tools.

To maintain the optimal performance of D2 tool steel round bar, it should be annealed after machining or grinding to prevent cracking and distortion. The steel can also be hardened by heating it to a specific temperature and then cooling it in air.