Properties
Hot work tool steel exhibiting fine heat checking resistance, superior hot tensile and good impact properties; admits water cooling. Cobalt enables the steel to perform under high duty conditions. BÖHLER W321 is also available in the special grades ISODISC and ISOBLOC with improved homogeneity and increased toughness.

Applications
Highly stressed hot work tools, mainly for the processing of heavy alloys, such as mandrels, dies and containers for metal tube and rod extrusion; hot extrusion tools; tools for the manufacture of hollows, screws, rivets, nuts and bolts. Die casting tools, forming dies, die inserts, hot shear blades.