Easy cutting steel refers to alloy steel in which a certain amount of one or more easy cutting elements such as sulfur, phosphorus, lead, calcium, selenium, tellurium, etc. are added to the steel to improve its machinability. With the automation, high speed, and precision of cutting processing, it is very important for steel to have good machinability. This type of steel is mainly used for processing on automatic cutting machines and therefore also belongs to specialized steel.