摘要
对T2 2、T91钢锅炉再热器管高温水蒸气氧化失效进行分析 ;利用能谱分析仪测试分析氧化皮截面合金元素的浓度变化。结果表明 :T2 2、T91钢管在高温蒸汽环境下产生的氧化皮恶化其传热性能 ,导致管壁有一定的超温现象 ;氧化皮可分为双层结构 ,内层为含Cr的保护性氧化膜 ,外层主要为Fe2 O3 氧化物 ,内外层之间存在着大量的细小空洞缺陷 ;外氧化层有较明显的剥落 ,剥落的外氧化层聚集在弯头处导致管壁的过热、过烧 。
Oxidating failure of T22 and T91 boiler reheater tube caused by high temperature steam was analysed, as well as the concentration change of oxidating layer’s alloy element was measured by using energy spectrometer. The result shows that the capability of heating transfer of T22 and T91 tubes was decreased by oxide layer, which caused the temperature on tube wall increased to a much higher degree. The oxide layer consists of two parts, the inner part is the protective oxide film of Cr and the outer part is Fe_2O_3, and there were many small holes between these two parts. The outer oxide film peeled off and aggregated at the elbow of tubes so that led over heating or superburning of tube wall and explosion of tubes.
出处
《铸造技术》
CAS
北大核心
2004年第7期523-525,共3页
Foundry Technology
