Hot Isothermal Forging (HIF) became an important technology for producing rotationally symmetric parts in near net shape. It is applied to titanium and superalloys that are hard to shape, used in jet-engine subject to high stress.

If the forging is done under „Superplastic“ conditions, only small stresses occur in the workpiece and the grain-size remains nearly unchanged. Isothermal forging is typically performed at temperatures of 1.050 °C – 1.200 °C in the case of superalloys or 900 °C – 1.050 °C in case of titanium alloys.