660MW超超临界机组锅炉集箱管座大面积裂纹分析  

Analysis of Large Area Cracks of Boiler Headers Pipe Base for 660 MW Ultra Supercritical Units

作　　者：罗洪辉 龙会国 王鹏 LUO Honghui;LONG Huiguo;WANG Peng(Hunan Huadian Pingjiang Power Station Co.,Ltd.,Yueyang 414000,China;State Grid Hunan Electric Power Company Limited Research Institute,Changsha 410007,China;Hunan Xiangdian Test Research Institute Co.,Ltd.,Changsha 410004,China;Huaneng Hunan Yueyang Power Generation Co.,Ltd.,Yueyang 414000,China)

机构地区：[1]湖南华电平江发电有限公司,湖南岳阳414000 [2]国网湖南省电力有限公司电力科学研究院,湖南长沙410007 [3]湖南省湘电试验研究院有限公司,湖南长沙410004 [4]华能湖南岳阳发电有限责任公司,湖南岳阳414000

出　　处：《湖南电力》2020年第5期35-38,共4页Hunan Electric Power

摘　　要：通过裂纹宏观形貌、显微组织等分析,研究了660 MW超超临界机组锅炉用集箱大面积管座制造焊缝裂纹原因。结果表明,焊接热输入量大、未进行焊前预热及焊后立即热处理,造成焊缝淬硬性组织及网状组织晶界弱化,在焊接拘束应力、焊接残余应力及高温热处理等作用下产生焊接裂纹。焊接工艺不当是造成焊接裂纹的主要原因。Based on the analysis of the macro-morphology and microstructure of the cracks,the cause of the large area welding crack in the pipe base of the boiler header for 660 MW ultra-supercritical unit is studied.The results show that the welding heat input is large,the weld hardenability and reticular structure are weakened without preheating before welding and heat treatment immediately after welding,and the welding crack is produced under the action of welding restraint stress,welding residual stress and high temperature heat treatment.Improper welding technology is the main cause of welding crack.

关 键 词：12CR1MOVG 钢 SA-106C 钢 角焊缝 冷裂纹 再热裂纹 

分 类 号：TK225[动力工程及工程热物理—动力机械及工程]