STEEL FOR MANUFACTURE OF ITEMS WITH INCREASED HARDNESS PENETRATION Russian patent published in 2014 - IPC C22C38/38 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy, and namely to steels of bainite class with increased hardness protection, and can be used at manufacture of large-sized items operating under conditions of considerable impact actions, high pressure vessels, cutting tools, and in special equipment. Steel contains the following, wt %: carbon 0.10-0.20; manganese 2.0-3.0; chrome 2.0-3.0; silicon 1.0-1.5; molybdenum 0.4-0.6; vanadium 0.08-0.12; and iron is the rest. After heating for hardening to the temperature of 930°C, exposure during 1 hour and cooling in the air, steel items have a structure of lower noncarbide bainite.

EFFECT: steel has increased stability of undercooled austenite in the area of bainite conversion, increased hardness protection, impact viscosity and crack resistance at maintaining high strength level.

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