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- W2374809757 abstract "The chemical composition, mechanical properties, metallographic phase and fracture of off-grade drill pipes were investigated. The results show that all the cracks of drill pipes are intergranular cracks, white blocks riched in Pb, Sn and Sb were found in the grain boundary of the cracks. Through inspecting and analyzing of every process in drill pipes' fabrication, it can be seen that local high temperature were produced by excessive magnetization current or arcing electrode and lowing-melting point Pb-Sn-Sb magnetization electrode melted and attached on the pipe during magnetic powder inspection process. After the following friction welding and internal coating, Pb, Sn and Sb diffused into the pipe substrate and formed crack source under the action of an external force." @default.
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- W2374809757 date "2009-01-01" @default.
- W2374809757 modified "2023-09-25" @default.
- W2374809757 title "Analysis of Drill Pipe's Crack Caused by Heavy Metal Pollution" @default.
- W2374809757 hasPublicationYear "2009" @default.
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