Stress Corrosion Cracking of Heat Exchanger Tubes in District Heating System

IF 0.8 Q4 ELECTROCHEMISTRY Corrosion Science and Technology-Korea Pub Date : 2019-04-30 DOI:10.14773/CST.2019.18.2.49
Sang-Won Cho, Seon-Hong Kim, W. Kim, Jung-Gu Kim
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Abstract

The purpose of this paper is to present failure analysis, of the heat exchanger tube in a district heating system. SS304 stainless steel is used, as material for the heat exchanger tube. The heat exchanger operates in a soft water environment containing a small amount of chloride ions, and regularly repeats operation and standstill period. This causes concentration of chloride ions on the outer surface of the tube, as well as repeat of thermal expansion, and shrinkage of the tube. As a result of microscopic examination, cracks showed transgranular as well as branched propagation, and many pits were present, at the initiation point of each crack. Energy disperstive spectroscopy analysis showed Fe and O peak, as well as Cl peak, meaning that cracks were affected by Cl ion. Failure of the tube was caused by chloride-induced stress corrosion cracking by thermal stress, high temperature, and localized enrichment of chloride ions.
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区域供热系统换热管的应力腐蚀开裂
本文的目的是对区域供热系统中换热器管的失效进行分析。换热管材料采用SS304不锈钢。换热器在含有少量氯离子的软水环境中运行,定期重复运行和静止期。这导致氯离子的浓度在管的外表面,以及重复的热膨胀,和管的收缩。细观观察发现,裂纹表现为穿晶扩展和枝状扩展,在裂纹的起始点处存在许多凹坑。能谱分析显示Fe、O峰,Cl峰,说明裂纹受到Cl离子的影响。热应力、高温和氯离子局部富集引起的氯致应力腐蚀开裂是导致钢管失效的主要原因。
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来源期刊
CiteScore
1.30
自引率
66.70%
发文量
0
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