The Development of High Hard and Tough Matrix Type High Speed Tool Steels 
By SHUN-SUKE NAKAHAMA*1, YUKINORI MATSUDA*2, KUNIO NAMIKI*3, KOZO OZAKI*4

6. Conclusions

We have developed new matrix type high speed steels aiming at high toughness and fatigue strength by decrease coarse primary carbides with maintaining the required amount of carbides. This concept has been realized by the combination of alloy designing and state-the-art of production technologies. These new grades, DRM steels, have shown their superiority to conventional steels in actual applications and are expected to expand their application fields by replacing conventional steels for forging tools.

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