Piercing Failure Reasons of Ethylene Cracking Twisted-Tape-Tube
摘 要
采用化学成分分析、宏观观察、金相观察、能谱分析和X射线衍射分析等方法, 对乙烯裂解扭曲片管穿孔失效原因进行了分析。结果表明: 扭曲片管穿孔失效是硫化腐蚀造成的; 扭曲片管的氧、氮含量高, 并有铸造缺陷(疏松)和冶金缺陷(夹杂物), 加上工作介质中高的硫、钠含量, 使硫在缺陷处滞留和聚集, 形成的腐蚀产物与金属镍形成了低熔点共晶Ni-Ni3S2 , 其在工作条件下变成液体后, 使管壁的局部腐蚀加速, 最后造成穿孔失效。
Abstract
Chemical composition analysis, macroscopic observation, metallographic observation, energy spectrum analysis and X-ray diffraction analysis were used to analyze the piercing failure reasons of ethylene cracking twisted-tape-tube. The results show that the piercing failure of twisted-tape-tube was caused by sulifide corosion. Some reasons, such as high oxygen and nitrogen content,cast defect (microshrinkage) and metallurgy defect (inclusions) with high sulfur content and sodium content, made sulfur detain and gather at defects positions and forme Ni-Ni3S2 low melting point eutectic, which accelerating local corrosion of internal wall of twisted-tape-tube and causing piercing failure at last.
中图分类号 TG132.3
所属栏目 失效分析
基金项目
收稿日期 2012/11/20
修改稿日期 2013/11/15
网络出版日期
作者单位点击查看
备注王晓艳(1982-), 女, 辽宁大连人, 助理讲师, 硕士研究生。
引用该论文: WANG Xiao-yan,ZHANG Wei-qiang,ZHENG Zhi,TONG Jian,YU Yong-si. Piercing Failure Reasons of Ethylene Cracking Twisted-Tape-Tube[J]. Materials for mechancial engineering, 2014, 38(1): 99~103
王晓艳,张伟强,郑志,佟健,于永泗. 乙烯裂解扭曲片管穿孔失效的原因[J]. 机械工程材料, 2014, 38(1): 99~103
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