Tool steel round bar O1 is a type of oil-hardening steel that is commonly used in the production of cutting tools, dies, and punches. It is a general-purpose tool steel that is known for its excellent toughness, wear resistance, and machinability.

O1 tool steel contains about 1% carbon and 0.5% chromium, which give it good hardness, wear resistance, and dimensional stability. It is an oil-hardening steel, which means that it is hardened by cooling it in oil instead of quenching it in water.

Tool steel round bar O1 is often used in applications that require high levels of wear resistance and toughness, such as blanking and forming dies, cutting tools, gauges, knives, and punches. It is also commonly used in applications that require good machinability, such as low-stress components and parts.

When working with O1 tool steel round bar, 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 O1 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 oil.