电站锅炉无缝冷拔钢管内壁线性缺陷检测方法分析  

Detection and Analysis of Linear Defects in Inner Wall of Cold Drawn Steel Tubes of Utility Boilers

作　　者：张艳飞[1] 王英军[1] 刘孝[1] 赵晓春[1] 韩扩[1] ZHANG Yanfei;WANG Yingjun;LIU Xiao;ZHAO Xiaochun;HAN Kuo(Inner Mongolia Power Research Institute,Hohhot 010020,China)

机构地区：[1]内蒙古电力科学研究院,呼和浩特010020

出　　处：《内蒙古电力技术》2021年第2期62-65,共4页Inner Mongolia Electric Power

摘　　要：分别采用“金相+压扁”联合检测方法和超声导波检测方法对某超临界锅炉末级过热器T91钢管内壁线性缺陷进行了检测,并对两种检测方法的优缺点进行了对比。结果表明,采用“金相+压扁”联合方法检测锅炉受热面钢管内壁线性缺陷,结果准确,利于排除深度浅但危害性大的线性缺陷;其缺点是需割管取样检测,检测效率低、检测周期长。采用超声导波能够实现对锅炉受热面钢管内壁线性缺陷的检测,检测速度快、检测前打磨工作量小,但是受限于线性缺陷特征,其检出率较低。In this paper,the linear defects on the inner wall of the steel tube of the final superheater of a supercritical boiler made of T91 are detected by means of metallography+flattening method and ultrasonic guided wave detecting method.The results show that the method of metallography+flattening is accurate to detect the linear defects on the inner wall of the heating surface of the installed or in-service boiler,and it is beneficial to eliminate the linear defects of low depth but great harm.The disadvantage of the method is that it needs to cut pipe for sampling detection,which has lower detection efficiency and longer detection cycle.The ultrasonic guided wave of circumferential mode can detect the linear defects on the inner wall of the boiler heating surface steel pipe,and has the advantages of high detecting speed and small detecting and grinding workload,but limited by the characteristics of linear defects,its detectable rate is low.

关 键 词：锅炉 冷拔钢管 线性缺陷 金相检测 压扁试验 超声导波 

分 类 号：TG142.1[一般工业技术—材料科学与工程] TM621.72[金属学及工艺—金属材料]