Abstract
This paper reports the results obtained from sulphidation tests on a low-alloyed steels 15HM (T/P12), 16M (T/P1), 18K and 10HM2 (T/P22) in the temperature range 450–550 °C for 100 h. Tests were conducted using a gas mixture of 1%H2S 99% Ar at 1 bar. The results indicate that the low-alloyed steels underwent a high degree of corrosion degradation due to the formation of an Fe1−XS scale. The scale thicknesses and chemical compositions of the scales formed on the exposed samples were analysed by means of standard techniques, including scanning electron microscopy coupled with energy X-ray dispersive spectroscopy. In addition, a phase diagram for the Fe–S system was calculated using FACTSAGE software to aid interpretation of the results. Based on the study conducted, relevant defect equations were proposed.
Highlights
Development of modern technologies and enrichment of societies around the globe requires higher amounts of electricity outputs from power stations
The present study shows the outcomes of high-temperature studies performed on low-alloyed ferritic steels 18K, 16M (T/P1), 15HM (T/P12) and 10H2M (T/P22) in the temperature range 450–500 °C for 100 h
The presented images showed that the exposed samples underwent catastrophic corrosion degradation due to the formation of highly porous, nonprotective sulphide scales that exfoliate from the metallic core of the substrate
Summary
Development of modern technologies and enrichment of societies around the globe requires higher amounts of electricity outputs from power stations. As previously mentioned, coal containing sulphur produces harsh reducing conditions upon burning Such an atmosphere promotes the formation of highly aggressive hydrogen sulphide (H2S) leading to accelerated sulphidation and fast corrosion degradation of low-alloyed steels [10]. Due to the low price, good weldability, high thermal conductivity and low thermal expansion coefficient (CTE), low-alloyed ferritic steels are widely used in pulverised coal-fired boilers for waterwall tubes and other sections working under relatively low temperatures (e.g. economizer) [11, 12]. These alloys possess a low Cr content, not exceeding 3 wt%. The present study shows the outcomes of high-temperature studies performed on low-alloyed ferritic steels 18K, 16M (T/P1), 15HM (T/P12) and 10H2M (T/P22) in the temperature range 450–500 °C for 100 h
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
