Typical hot work applications for S1 tool steel include mandrel bars for drawing steel tubes.  Medium temperature applications include swaging, forming and gripper dies, also punching, piercing and trimming dies. Other applications include shear blades working at medium temperature including flying shear blades.

Heat carefully to 1000-1050°C and forge with light rapid blows. Reheat when temperature falls below 900°C if further work remains to be done. After forging, cool slowly, preferably in a furnace.

Heat the S1 tool steel component slowly and uniformly to 800-810°C. Soak thoroughly for two to three hours and cool slowly in the furnace to room temperature.

For applications where distortion must be at a minimum or where the machining operations have been severe, we recommend stress relieving just before the tools are finish machined in order to relieve machining strains. Heat slowly to 700°C and allow to cool in the air.

Pre heat at 650°C followed by rapid increase of temperature to the hardening temperature of 900-950°C. Quench in oil. 

Heat slowly to the required tempering temperature, soak thoroughly for two hours per 25mm section and allow to cool in still air. For hot work applications, a minimum tempering temperature of 550°C should be used.

Heat treatment temperatures, including rate of heating, cooling and soaking times will vary due to factors such as the shape and size of each S1 steel component. Other considerations during the heat treatment process include the type of furnace, quenching medium and work piece transfer facilities. Please consult your heat treatment provider for full guidance on heat treatment of S1 tool steel.