HIGH-SPEED STEEL Russian patent published in 2009 - IPC C22C38/52 

FIELD: metallurgy.

SUBSTANCE: high-speed steel contains carbon, silicon, manganese, chrome, tungsten, molybdenum, vanadium, nickel, cobalt, aluminium, silver, lithium and iron, at following ratio of components, wt %: carbon 0.3-0.6, silicon 0.1-0.15, manganese 0.1-0.2, chrome 5.5-6.5, tungsten 5.5-6.5, molybdenum 4.0-5.0, vanadium 2.5-3.0, nickel 3.5-4.5, cobalt 3.5-4.5, aluminium 0.12-0.18, silver 0.1-0.12, lithium 0.0001-0.0002, iron - the rest.

EFFECT: impact resistance increasing of steel.

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