TY - JOUR N2 - The S304H steel is used in the construction of pressure components of boilers with supercritical operating parameters. The paper presents the results of the research on the microstructure after ageing for 20,000 hours at 650 and 700°C. The microstructure examination was performed using scanning and transmission electron microscopy. The precipitates were identifies using transmission electron microscopy. The influence of ageing time on microstructure changes and the precipitation process of the tested steel is described. The presented research results are an element of material characteristics of the new generation of steel, which are used in the design work of pressure devices of steam boilers and in diagnostic work during operation. L1 - http://www.journals.pan.pl/Content/123271/PDF-MASTER/AMM-2022-2-13-Sroka.pdf L2 - http://www.journals.pan.pl/Content/123271 PY - 2022 IS - No 2 EP - 493 DO - 10.24425/amm.2022.137781 KW - S304H steel KW - microstructure KW - precipitates KW - ageing KW - Cu_rich phase KW - sigma phase A1 - Wersta, R. A1 - Zieliński, A. A1 - Sroka, M. A1 - Puszczało, T. A1 - Sówka, K. PB - Institute of Metallurgy and Materials Science of Polish Academy of Sciences PB - Committee of Materials Engineering and Metallurgy of Polish Academy of Sciences VL - vol. 67 DA - 2022.06.10 T1 - Structure of the S304H Steel after 20,000 Hours of Ageing SP - 487 UR - http://www.journals.pan.pl/dlibra/publication/edition/123271 T2 - Archives of Metallurgy and Materials ER -