Mechanical properties of chromium-nickel-molybdenum steels with the carbon contents of 0.1 to 0.4% after slow continuous cooling in the bainitic range have been determined, and the structure has been investigated. It has been shown that, at a carbon content of about 0.10-0.15% and upon additional alloying with silicon and aluminum after such a heat treatment, in steels, the structure of carbide free bainite is formed and a substantial enhancement in the impact toughness is observed compared to bainite containing carbide precipitates. The enhancement in the level of toughness is related to the presence in carbide free bainite of an appreciable amount of retained austenite enriched with carbon.

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