STUDY ON THE HOT-DIE STEELS

We studied on the hot-die steels as follows: (1) The various mechanical properties, not only at the room temperature, but also at the high temperature, especially the high temperature impact hardness, of the low C-high W-Cr-V steel. (2) The influences of C and V of this steel on the mechanical properties. (3) The influences of W. From these data we could confirm that W content may be lowered to about half amount, if C content is kept at about 0.5%. (4) Furthermore the various mechanical properties at the room and the high temperature of about 0.7% C, medium Cr, low Cr, Cr-V, low Cr-Ni-Mo, medium Cr-Ni-Mo and high Cr-Ni-W steels. (5) The mass efiects of these steels by the test pieces φ90mm×90mm height.