Carburizable High Speed Steel Alloys

TL;DRAbstract

A new family of patent pending high speed steel alloys has been developed. The compositions of the steels are related to the compositions of standard high speed steels (HSS) and die steels. However, the nominal carbon content of these alloys is approximately 0.20%. These are carburizable grades of HSS. The other major compositional differences between these alloys and conventional HSS are that the new alloys contain less than 1.50% chromium. Unlike alloy M50-Nil, these new steels do not have to be pre-oxidized prior to being carburized. The modified HSS alloys are carburized using standard processing identical to the procedures used with carburizable alloy steels such as 4320, 8620 or 8720. Once carburized, the alloys are then heat treated for maximum hardness using the time and temperature cycles employed for standard HSS. That is, the steels are preheated, austenitized, quenched, and double tempered. To offset the effect of chromium on hardenability and secondary hardening, the molyb

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