General
Uddeholm QRO 90 Supreme is a high-performance, chromium-molybdenum-vanadium alloyed hot work tool steel which is characterized by:

• Excellent high temperature strength and hot hardness

• Very good temper resistance

• Unique resistance to thermal fatigue

• Excellent thermal conductivity

• Good toughness and ductility in longitudinal and transverse directions

• Uniform machinability

• Good heat treatment properties

Improved tooling performance
Uddeholm QRO 90 Supreme is a specially premium hot work steel developed by Uddeholm to provide better performance in high temperature tooling.
The name "supreme" implies that by special manufacturing techniques, including electro-slag remelting the steel attains high purity and good mechanical properties. This together with the optimum balance of alloying elements in Uddeholm QRO 90 Supreme gives a properties profile which is unique among hot work die steel. The combination of high temperature strength, temper resistance and thermal conductivity exhibited by Uddeholm QRO 90 Supreme is unparalleled. Thus Uddeholm QRO 90 Supreme has given improved service life in die casting and extrusion of nonferrous metals and forging and extrusion of steel.