|HERMANOVÁ Šárka||VITKOVICE POWER ENGINEERING a.s.|
|Spoluautoři ČINČILA Radomír, KANDER Ladislav|
This paper focuses on the influence of the cold bending process on stress -strain characteristics of materials SUPER304H, HR3C, Tp347HFG that can be used for superheaters and reheaters of newly built or refurbished power plant boilers.The qualification tests were carried out on bends in two dimensions of tubes and on several bending radii to verify the effect of cold bending technology. In the year 2013 was tested new bend radius. 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 whose results are in this paper presented and are extended of the results obtained from the new bend radius compared to last year article. We acquire new information about the stress-strain behaviour of advanced structural materials thanks to the realization this experimental program. We can give precision to correlation relations between SPT and conventional tensile tests for austenitic materials presented in the year 2013. In the context of the project were performed the simulation calculations used the experimental results focused on verification the deformation in bending parts, thinning the wall thickness and determination the thermodynamic stability of phases. Some of them are described in this article. The tests are carried out under the grand project of the Technology Agency of Czech Republic 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 companies named UJP a.s. and SVÚM a.s.