14Cr1MoR钢在高温硫环境中的失效行为
Failure Analysis of 14Cr1MoR Sreel in High Temperature Sulfur Environment
摘 要
采用14Cr1MoR钢制成的焦炭塔，在进料口附近出现了大面积的密集腐蚀坑。采用扫描电子显微镜和金相显微镜对蚀坑内部的宏观形貌和微观组织进行了观察，并采用能谱分析仪和硬度计对蚀坑内的覆盖物成分和母材硬度进行了分析。结果表明：蚀坑内的覆盖层主要含有铁元素、硫元素以及碳元素。焦炭塔进口部位由于介质流动会对塔壁造成冲刷，使塔壁上难形成焦炭保护层或者使附着的焦炭层被冲刷掉。最终导致高含硫的腐蚀介质直接与塔体接触，产生较严重的高温硫腐蚀。
高温硫
腐蚀
14Cr1MoR steel
high temperature sulfur
corrosion
Abstract
A coke drum made of 14Cr1MoR steel had a large area of dense corrosion pits near the feed port. The macroscopic morphology and microstructure of the pits were observed by scanning electron microscopy and metallographic microscopy. The composition of the coating and the hardness of the base material in the pits were analyzed by energy spectrum analyzer and hardness tester. The results show that the coating in the pits mainly contained iron, sulfur and carbon. The entrance of the coke drum would cause erosion of the tower wall due to the flow of the medium, making it difficult to form a coke protective layer on the tower wall or causing the attached coke layer to be washed away. Eventually, the high sulfur corrosive medium was directly contacted with the tower body, resulting in more severe high temperature sulfur corrosion.
中图分类号 TE96 DOI 10.11973/fsyfh-201903012
所属栏目 失效分析
基金项目
收稿日期 2017/10/17
修改稿日期
网络出版日期
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引用该论文: SUI Guangzhou,MO Yeqiang,SUN Liang,HOU Yanhong. Failure Analysis of 14Cr1MoR Sreel in High Temperature Sulfur Environment[J]. Corrosion & Protection, 2019, 40(3): 215
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参考文献
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【14】BABU S P K,NATARAJAN S. High temperature corrosion and characterization studies in flux cored arc welded 2.25Cr-1Mo power plant steel[J]. Journal of Materials Engineering and Performance,2010,19(5):743-750.
【15】CHENG Q L,NAI M W,KAI Q Y. Heat transfer analysis of the operation in delayed coking coke drum[J]. Applied Mechanics and Materials,2013,448/453:3277-3280.
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