Forging Hot forming temperature: 1100-850 C. Machinability Machinability of CK60 and all of the higher carbon steels is relatively poor. CK60 rates at 55 to 60 Is a ductile material and malleable, responsible for the good workability of low carbon steels and is ferromagnetic until the 770 °C. (Curie temperature). ❑ Ch-27.4 Plain Carbon Steel - View presentation slides online. what use type. High carbon steel (more the 0.8 %C) HEAT TREATMENT OF TOOL STEEL.pdf.Patenting consists of passing the wire through tubes in a furnace at about 970°C. This high temperature treatment produces uniform austenite of rather large