锅炉水冷壁管失效分析  

Analysis on Failure of Water-cooled Wall Tube in Boiler

作　　者：郭海霞[1] 张欣耀[1] 袁晓冬 GUO Haixia;ZHANG Xinyao;YUAN Xiaodong(Luoyang Ship Material Research Institute,Luoyang 471023,Henan China)

机构地区：[1]洛阳船舶材料研究所,河南洛阳471023

出　　处：《热处理》2024年第2期55-57,60,共4页Heat Treatment

摘　　要：锅炉水冷壁管材料为20G钢,在320℃和10.3 MPa下使用约5年后外表面出现鼓包并泄漏。对失效的水冷壁管进行了宏观检查、化学成分分析、力学性能检测、金相检验、腐蚀产物分析及锅炉水质检测。结果表明:水冷壁管失效是由于锅炉水碱性超标从而发生高温碱腐蚀所致。The water-cooled boiler wall tube of 20 G steel exhibited bulges at its external surface and leaked after being used at temperature of 320℃and under pressure of 10.3 MPa for about 5 years.The failed water-cooled wall tube was subjected to macro check,chemical composition analysis,mechanical property measurements,metallographic examination and corrosion product analysis,and the boiler water was tested for quality.The results demonstrated that the failure of water-cooled wall tube was attributed to the excessive alkalinity of the boiler water and thereby occurrence of high-temperature alkaline corrosion.

关 键 词：水冷壁管 高温碱腐蚀 泄漏 

分 类 号：TG115[金属学及工艺—物理冶金]