Abstract
Eight kinds of high speed steels in which the primary precipitates such as VC or VN were added to SKH51 matrix composition, were produced by HIP'ing gas atomized powders. The properties of steels after quenched and tempered were studied, and the following results were obtained:
(1) Hardness of VN series steels was slightly lower than that of VC series ones, but its wear rate was almost the same as that of VC series.
(2) Red hardness of VN series was lower than that of VC series.
(3) Bend strength and intermittent cutting performance of VN series were superior to those of VC series.
