理化检验-物理分册2026，Vol.62Issue(5)：36-40,5.DOI:10.11973/lhjy-wl260008
316L不锈钢换热器盘管穿孔原因
Causes of perforation in 316L stainless steel heat exchanger coils
任群 1温娟 1史学星1
作者信息
- 1. 首钢集团有限公司技术研究院,北京 100041
- 折叠
摘要
Abstract
After six months of service,perforation occurred on the surface of a 316L stainless steel heat exchanger coil.Macroscopic observation,scanning electron microscopy(SEM)with energy dispersive spectroscopy(EDS),metallographic examination,and chemical composition analysis were used to characterize the morphology of the inner and outer walls at the perforation,corrosion products,microstructure,and chemical composition of the tube wall.The results show that abnormal carbides existed in the coil.These carbides reduced the corrosion resistance of the coil,and their spalling provided sites for the deposition of corrosive media outside the tube.Under the action of external environmental media,pitting corrosion initiated at the pits formed by carbide spalling.Combined with continuous scouring by the external fluid and intergranular corrosion during the corrosion process,the corrosion gradually propagated through the tube wall to the inner surface,eventually leading to corrosion perforation.关键词
316L不锈钢/换热器盘管/碳化物/点蚀/晶间腐蚀/穿孔Key words
316L stainless steel/heat exchanger coil/carbide/pitting corrosion/intergranular corrosion/perforation分类
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任群,温娟,史学星..316L不锈钢换热器盘管穿孔原因[J].理化检验-物理分册,2026,62(5):36-40,5.
