Increasing extrusion temperature
decreased flow stress and extrusion pressure
• The top working temperature should be safely
below the melting point or hot-shortness range.
• Oxidation of billet and extrusion tools.
• Softening of dies and tools.
Effects of temperature on hot extrusion
Note: Working temperature in extrusion is
normally higher than used in forging and
rolling due to relatively large compressive
stresses in minimising cracking.