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[en] The complex technology of melting, rolling and hot treatment of the 10KhSNDA and 15KhSNDA steels for production of sheets 12, 14, 16 and 20 mm thick is experimentally developed. It is recommended to decrease the C, Mn, Ni and Cr content and introduce the V and Ni micro additions with the purpose of improving the weldability without loss of strength. The steel, melted in an arc furnace, was subjected to deoxidation and out-of-furnace desulfurization. The obtained ingots underwent thermal strengthening from the rolling temperature and accelerated cooling The hot-rolled sheets after quenching and tempering had fine-grained ferrite-perlitic properties, corresponding to the standard requirements

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[en] Investigation results of kinetics and quality of carbon steel oints with the steel 12Kh18N10T, obtained by pressure welding with superposition of ultrasonic oscillations with the frequency 16.5-18.0 kHz are given. The effect of ultrasonic oscillations on the process of physical contact development of the surfaces welded, formation of microstructure and impact viscosity of the compound, is shown

[en] A method of thermodynamic analysis of intergranular corrosion of austenitic steels was used for finding an analytical dependence of a corrosion index - the maximum temperature (Tsub(max)) of intergranular corrosion, on the chemical composition of the steel. A lower carbon (nitrogen) activity leads to a lower Tsub(max), i.e. to a higher resistance of steel to this type of corrosion. It is shown analytically that Tsub(max)<=Tsub(eq), an equilibrium temperature of carbide formation in steel, and also the difference 1/Tsub(eq) - 1/T are governed primarily by the concentration of chromium in the steel. Agreement of the dependencies obtained with the available experimental data points to the possibility of using the proposed method of finding Tsub(max) on the basis of thermodynamic data

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[en] Probable reasons for arising tendency to intergranular corrosion (IGC) of Ni-Mo base alloys are analyzed. It is disclosed experimentally that carbide precipitation over grain boundaries with corresponding molybdenum depletion of near the boundary sections is one of the basic mechanisms. Growth of molybdenum content is shown to increase corrosive resistance of the alloy decreasing current density in the anode region