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TTUEnergetik,d.o.o. , Tuzla , Bosnia and Herzegovina
University of Zenica , Zenica , Bosnia and Herzegovina
University of Zenica , Zenica , Bosnia and Herzegovina
The HK30Nb steel pipe casting was obtained by centrifugal casting. This steel is austenitic stainless steel grade AISI HK 30 and is standardized according to ASME SA-351 in as cast condition. HK 30 Nb steels not standardized i.e. it is HK 30 steel modified with niobium. In addition to the required mechanical properties, this steel is also tested for heat resistance because it is used at high temperatures. In this paper, the heat resistance testing was carried out on the HK 30 Nb stainless steel pipe casting for two temperatures (750 and 850 oC) according to the standard ASTM G 54-84. The mass change and rate of oxidation for different heating times (24, 48, 72, 96 and 120 hours) were determined. The results of the study are significant for the continued use of these materials at high temperatures in exploitation conditions.
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