The Uddeholm steel grades for hot work are:
Alvar 14
Orvar 2M
Orvar Supreme
Vidar Supreme
QRO 90 Supreme
Hotvar Dievar
As the performance of the die casting die can be improved by lowering the impurities, i.e. sulphur and oxygen, all the hot work tool steels are produced with extremely low sulphur and oxygen levels.
The optimum structure for machining is a uniform distribution of well spheroidized carbides in a soft annealed ferritic structure with as low hardness as possible. The manufacturing process gives a homogeneous structure and a hardness of approximately 180 HB. The steels are characterised by a very uniform machinability. | 
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