Steels for Bridge Structures

Metallurgist - We consider domestic and foreign standards for rolled metals used in bridge building. Domestic standards contain elevated requirements to the reliability of rolled metals in terms of...     

Radar reflectivity in snowfall

Backscattering properties of dry snowflakes at different microwave frequencies are examined. It is shown that the Rayleigh approximation does not often provide the necessary accuracy for snowflake reflectivity calculations for radar wavelengths used in meteorology; however, another simple approximation, the Rayleigh-Gans approximation, can be safely used for such calculations. Reflectivity-snowfall rate relationships are derived for different snow densities and different radar frequencies. It is shown that dual-wavelength radar measurements can be used for estimating the effective sizes of snowflakes. Experimental data obtained during radar snowfall measurements in the WISP project of 1991 with the NOAA X- and Ka-band radars are found to be consistent with the described theoretical results     

Computerized means of determining porosity parameters with a two-dimensional gas flow model

A model is presented for determining porosity from a two-dimensional gas flow model. A device is described for determining the porosity parameters. Experimental curves are given relating the porosity parameters to the thickness. __________ Translated from Izmeritel’naya Tekhnika, No. 12, pp. 53–57, December, 2006.     

Influence of pipe processing on the mechanical properties of K60 steel sheet

The mechanical properties of thick steel sheet (13?C27 mm) produced at PAO MK Azovstal?? and the basic metal in K60 pipe (diameter 1220 mm) for the VSTO pipeline manufactured at PAO Khartsyzskii Trubnyi Zavod are subjected to statistical analysis, so as to establish the variation in the mechanical properties of the steel as a function of the sheet thickness and the wall thickness of the pipe and also under the influence of pipe processing.     

Detonation transmission through high-modulus dispersed media

This paper presents the results of experimental studies of detonation transmission through high-modulus powder materials. The features of the process related to the properties of such dispersed media and the prospects for their use in protective devices are discussed.     

Improvement of Low-Alloy Pipe Steel Sulfide Stress Cracking Resistance

Metallurgist - The influence of sheet microstructure formed by various thermomechanical processing schedules on sulfide stress cracking (SSC) resistance under uniaxial tension for low-alloy pipe...     

A study of the microstructure of niobium-microalloyed pipe steel after different modes of controlled rolling with accelerated cooling

The phase composition and mechanical properties of rolled thick sheets from pipe steel 05G1MB produced by different modes of controlled rolling with accelerated cooling are studied. The effects of the temperature and deformation regime, of the final rolling temperature, and of the temperature of the start of accelerated cooling on the phase composition of the rolled sheets are considered. The temperature range in which intense reduction during rolling should be avoided in order to keep niobium in the solid solution of the γ-phase and to ensure subsequent segregation of fine niobium carbides in ferrite is determined.