The High Temperature Stress Rupture Behavior of Super304H Steel Subjected to Simulated Coal Ash/Gas Corrosion
LIU Wu1,2, LU Jintao1, HUANG Jinyang1, DANG Yingying1, ZHAO Xinbao1, ZHAO Maiqun2, YUAN Yong1
1 National Energy R & D Center of Clean and High-Efficiency Fossil-Fired Power Generation Technology, Xi’an Thermal Power Research Institute Co., Ltd., Xi’an 710032; 2 College of Materials Science and Engineering, Xi’an University of Technology, Xi’an 710048
Abstract: The present work provides a comparative investigation on the creep rupture behavior of Super304H steel under simulated coal ash/gas environment and in static air condition, respectively, by using a synergistic corrosion-static loading apparatus. The results indicated that the corrosion medium shortened the rupture life of Super304H steel under varying stresses, and this shor-tening effect become more remarkable with the extension of exposure time. Based on the double logarithm method, the Super304H steel subjected to coal ash/gas corrosion was determined to be 80 MPa, with a decrement of about 43% compared to the specimen in static air condition (140 MPa). We observed a smooth oxide film formed on the steel surface in static air, and on the contrary, the loose and porous corrosion product and a large number of “tumor like” bulge product for the specimen surface under the simulated corrosion environment. XRD and EDS measurements showed that the corrosion products are rich in Fe, Cr, Ni, sulfides and complex sulfates. The decay of the high temperature durability of Super304H under loading can be ascribed to the corrosion-medium-induced increase of nucleation rate at the corrosion layer/metal interface.
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2018, Vol. 32 
