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《Materials for Mechanical Engineering》 2015-04
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Corrosion Resistance and Applicability of Four Different Steels in Sulfur Recovery Unit

ZENG De-zhi;SHANG Jian-feng;LONG De-cai;LIU Yuan-zhi;CUI Wen-peng;ZHANG Heng-wei;State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation,Southwest Petroleum University;Sinopec Zhongyuan Oilfield Branch;CNOOC-Fujian LNG Co.,Ltd;  
For the sulfur recovery unit in a high sulfur purification plant,liquid sulfur corrosion coupon testing was performed to study the corrosion resistance of 20 G,16MnR,304 Land 316Lsteels in sulfur recovery unit,and corresponding preventive measures were put forward.The results show that 304 Land 316Laustenitic stainless steels had good corrosion resistance in liquid sulfur,while 20 Gand 16MnR steels suffered serious H2SO3/H2SO4 dew point corrosion,H2O-H2 S corrosion and high-temperature sulfidation corrosion,and the corrosion mode was mainly uniform corrosion.The corrosion rate of 20 G steel and 16 MnR steel increased when the process temperature was very high or very low and when the water content and oxygen content increased.The corrosion products on 20 Gsteel and 16 Mn steel were mainly iron sulfide and oxide.In corrosive vapor,the corrosion products on 20 Gsteel and 16 MnR steel were mainly FeSO4 and FeSO3,in addition,a small amount of iron sulfide and oxide were found.Based on the results above,setting corrosion monitoring points and monitoring these points for a long time were suggested.What′s more,it is necessary to keep suitable repairing and maintenance for the easily corrosive positions.
【Fund】: 国家重大科技专项项目(2011ZX05017);; 高等学校博士学科点专项科研基金资助项目(20105121120002)
【CateGory Index】: TQ125.11;TG172
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