Spoluautoři DOBROVODSKÁ Lenka, KANDER Ladislav

This paper is focuses on evaluation of the plastic deformation effect after the cold bending process for new austenitic materials Super304H, HR3C and Tp347HFG designed for supercritical conditions. The qualification tests were carried out on bends in two dimensions of tubes which are the most common sizes used in superheaters for supercritical power plant boiler. The bends were produced by the method of cold bending with mandrel bending technology and without mandrel on several bending radii in order to obtain information about the structure and behavior of materials at various stages of deformation. To obtain reliable information tensile test, hardness test and metallographic examination were used on material from straight tubes of the bends, drawn and compressed parts which are presented in this article. We acquire new information about the stress-strain behavior of advanced structural materials thanks to the realization this experimental program. We also obtained the input data for subsequent long-term corrosion tests and thermal degradation tests and correlation relations for the determination of the strength properties of steels studied by SPT. The tests are carried out under the grand project of the Technology Agency TA01010181 with the name Bending-tubes-technology for superheaters and inter-superheaterstubes for the progressive boiler construction which VÍTKOVICE POWER ENGINEERING a.s. researches in cooperation with UJP a.s. and SVÚM a.s.