1. Use of a special furnace design with a built-in centrifugal fan that provides for circulation of the gaseous mixture at a rate of approximately 2 m/sec at a low gas-consumption rate makes it possible to conduct carburizing in a N2−H2−CH4 mixture without the formation of soot on the surface of the components. 2. In saturating a commercial-iron foil up to 45 μm thick with carbon in a gaseous N2−H2−CH4 mixture to a content that exceeds its solubility in austenite, a thin layer of cementite forms at the surface of the foil. A further extension of the carburizing time has virtually no effect on the thickness of the cementite layer and gives rise to the formation of a pyrocarbon film on the surface of the foil. 3. A carburized layer of appreciable thickness (about 1.0 mm after isothermal holding for 4 h at 930°C) and with a smoother concentration profile than that obtained with two-stage carburizing in other gaseous media forms during the carburizing of steel 18Kh2N4MA specimens in an N2−H2−CH4 medium. 4. Control of the carburizing process is facilitated with the use of an N2−H2−CH4 mixture. For a constant Cg value, control is, by nature, reduced to maintenance of the methane concentration in the mixture and to selection of the carburizing time.