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Edition and Publication:
< Natural Gas and Oil > Editorial Department
Hosted by:
China Petroleum Engineering & Construction Corporation Southwest Company
Authorized by:
China Petroleum Engineering & Construction Corporation
Co-hosted by:
Overseas Research Center of Research Institute of Petroleum Exploration and Development
Editor in Chief:
Du Tonglin
Vice Editor in Chief:
Tang Xiaoyong,Pu Liming
Address:
No.6, Shenghua Road, High-tech District, Chengdu, Sichuan, China
Postal Code:
610041
Tel:
028-86014709
028-86014500
Email:
cnpc-ngo@cnpc.com.cn
Issue:ISSN 1006-5539
CN 51-1183/TE

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Analysis on Cracking Reason of External Arc of Induction Heat Bend in L360 SAW Steel Pipe

Author of the article:Rong Ming, Xian Ning; Zhang Nange, Zhang Li, Zhou Huihui

Author's Workplace：1.China Petroleum Engineering Co., Ltd. Southwest Company;2.Research Institute of Natural Gas Technology Southwest Oil and gas field company PetroChina;3.Changqing Oilfield Mining Area Services Division Xinglong Park Property Service Department;4.Hangzhou Steam Turbine Auxiliary Equipment Co., Ltd.,

Key Words：Hot-bending bend; Crack; Cu contamination; SAW pipe

Abstract：Cracks are observed on external arcs of bends manufactured from L360 spiral welded (SAW) steel pipes. Conducted are physical and chemical inspection and metallographic examination and results show that quality of parent pipes meets requirements specified in relative standards. Applied are metallographic microscope, scanning electron microscopy (SEM) and energy spectrometer (EDS) for detection analysis on organizational structures and microstructures of crack fractographs and chemical composition distribution in crack areas and it is found that Cu contamination exists in crack source areas. Further study results show that Cu contamination on the surface of parent pipes is dominant to the bend cracking. For this reason, proposed are reasonable measures for controlling process quality during bend manufacturing.