TOOL MADE OF HIGH-SPEED STEEL Russian patent published in 2007 - IPC C21D1/09 C21D9/22 C22C38/24 

FIELD: machine engineering, possibly cold and hot mechanical working of different types of tools such as cutters, milling cutters, drills, screw taps and so on.

SUBSTANCE: in order to increase useful life period of tool of high speed steel P6M5 containing α-phase - martensite α-Fe alloyed with chrome, tungsten and molybdenum; γ-phase - austenite alloyed with chrome, tungsten and molybdenum, carbide Fe₆Mo₃W₃C₂ and vanadium carbide VC, concentration of austenite is no more than 2.0 ± 0.6 mass%, concentration of martensite is no less than 85.2 ± 4.0 mass%; concentration of Fe₆Mo₃W₃C₂ - 8.9 ± 0.5 mass%; concentration of VC - 2.8 ± 0.5 mass%.

EFFECT: increased useful life period of tool.

1 tbl, 1 ex