燃气管线弯管开裂原因分析  

Cracking Analysis of the Gas Pipeline Bend

作　　者：温宝峰 于永旺 李金梅 史伟 WEN Baofeng;YU Yongwang;LI Jinmei;SHI Wei(Shaanxi Coal Chemical Industry Technology Research Institute Co.,Ltd.,Xi'an 710065,Shaanxi,China;Lanzhou LS Test Technology Co.,Ltd.,Lanzhou 730314,Gansu,China)

机构地区：[1]陕西煤业化工技术研究院有限责任公司,陕西西安710100 [2]兰州兰石检测技术有限公司,甘肃兰州730314

出　　处：《热处理技术与装备》2025年第1期37-39,46,共4页Heat Treatment Technology and Equipment

摘　　要：某燃气公司在进行天然气管线的安装调试过程中,发现弯管上存在裂纹。采用扫描电子显微镜对其断口进行分析,并采用能谱分析、金相检验、硬度检测等方法对其靠近裂纹处、远离裂纹处的微观结构和性能进行分析,揭示了弯头开裂的原因。结果表明,该弯管在煨弯过程中局部发生过烧,造成晶界重熔,并在随后的冷却过程中发生开裂。In the process of installation and commissioning of a natural gas pipeline,the crack was found on the bend pipe.The fracture was analyzed by SEM,and the microstructure and properties near and away from the crack were analyzed by means of energy spectrum analysis,metallographic test and hardness test,and the reason of the crack was revealed.The results show that the bend is overburned locally during the simmering process,resulting in grain boundary remelting and cracking during the subsequent cooling process.

关 键 词：弯管 过烧 煨弯 晶界重熔 

分 类 号：TG142.41[一般工业技术—材料科学与工程]