This paper examines the effect of fabrication procedure and metal quality on the service properties of pipes fashioned from chromium-magnesium steel DI59. The kinetics of the development of creep strain of the metal in the temperature region from 650 to 730°C is investigated. It is indicated that vigorous strain begins to develop after 90% of the expected life has been exhausted. It is established that in the steel under investigation, the content of ó-phase over the entire period corresponding to 30 -90% exhaustion of expected life varies negligibly from 1.8 to 2.5%, and cannot be a criterion for estimation of exhaustion of the metal's expected life. The investigations that we conducted on steel DI59 tubes fabricated in accordance with a new procedure indicated a significant increase in the long-term ductility of the steel, which dictates the high quality of the metal.Keywords: quality and expected life of metal, steel DI59, service properties, tubes, metal strain, ductility of steel.
The article is devoted to the one-hundredth anniversary of Teploelektroproekt Institute, and presents areas of the institute’s current activities. Despite the difficult conditions, the financial and economic crisis, the Institute continues to be one of the leading design organizations in the field of developing projects of thermal power plants operating on organic fuels (coal, natural gas, fuel oil) with the installation of steam-turbine, steam-gas, gas turbine units and substations of various voltages, in terms of its production capacity, technical equipment, scope of work performed and scale of orders received. The technical policy of the Institute is orientated at the future, the key objective being ensuring a high scientific and technical level of projects, and technical and commercial proposals developed by the Institute. The Institute uses cutting edge technologies in the development of technical documentation; introduces advanced technical solutions throughout the project and conducts its uniform policy for the projects under development; provides consistently high quality of technical documentation on the basis of continuous improvement of its quality management system; improves methods of calculation/mathematical models and their implementation in the design process; ensures comprehensive and total accounting of the Customer’s requirements at preparation of technical and commercial offers, design of new and/or reconstruction and technical re-equipment of existing power-generating facilities; maintains close relations with scientific and design organizations, manufacturers of equipment, products and materials for the purpose of introduction of available advanced scientific and technical achievements in project documentation. Standardized layouts of the main buildings are designed for pulverized coal-based generating units of ultra-supercritical steam conditions, for circulating fluidized bed boilers, flue gas denitrification and desulphurization plants, for combined cycle plants. Examples of the power plant designing are presented for industrial facilities utilizing nonconventional fuels. A short description is given about the institute’s references in the field of construction of combined cycle and cogeneration plants as well as pulverized coal-based plants.
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