FRICTION PAIR CONTAINING RAILROAD RAIL AND RAILROAD WHEEL MADE OUT OF STEEL Russian patent published in 2009 - IPC F16H55/32 C22C38/52 C22C38/46 C22C38/30 C22C38/24 C22C38/12 C22C38/10 

FIELD: metallurgy.

SUBSTANCE: invention refers to iron and steel metallurgy, particularly to compositions of steel group applied for production of friction pair railroad wheel - railroad rail with wheel moving rate up to 500 km/h. The rail is made out of steel containing carbon, vanadium, cobalt, yttrium, copper, nickel, chromium, manganese, sulphur, phosphorus, aluminium, silicon and iron at the following ratio of components, wt %: carbon 1.20 - 1.35, vanadium 2.0-2.2, cobalt 0.80 - 1.92, yttrium 0.20 - 0.70, copper 0.30 - 0.60, nickel < 0.3; chromium < 0.3, manganese < 0.5, sulphur < 0.035, phosphorus < 0.03, aluminium < 0.01, silicon 0.17 - 0.37, iron - the rest; while the wheel is made out of steel containing carbon, vanadium, yttrium, copper, nickel, chromium, manganese, sulphur, phosphorus, aluminium, silicon and iron at the following ratio of components, wt %: carbon 0.36 - 0.49, vanadium 0.26 - 0.40, yttrium 0.20 - 0.70, copper 1.10 - 1.72, nickel 2.10 - 2.50, chromium < 0.3, manganese < 0.5, sulphur < 0.035, phosphorus < 0.03, aluminium < 0.01, silicon 0.17 - 0.37, iron - the rest.

EFFECT: increased contact-fatigue strength and, as result, reliability and durability of pair wheel-rail.

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