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      Tungsten in Tool Steels
Tool  steels are usually classified in four groups:
- Ledeburitic Cr-steels with less than 1% W - normally used for producing thread rolls and dies.
 - Cold work steels with 0.5 - 3% W, of which cutting tools for instance are made.
 - Hot work steels with 1.5 - 9% W, for dies and extrusion tools working up to 500°C and more.
 - Steels for plastic moulding (which do not include W-bearing steel grades).
 




 
 
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