Abstract:
It is a way to use the X65M carbon steel-316L stainless steel clad coil as raw material, and the HF ERW+arc overlaying welding combination process to produce the metallurgical composite pipe.The feasibility of this process is studied, and quality of the metallurgical composite pipe as made with this process is evaluated.Results of relevant analysis and tests show that the strengths of both the body and the weld of the metallurgical composite pipe as manufactured with the said combination process are up to applicable API specification;the Charpy impact energy values of the body and the weld are above 200 J, far more higher than what required by API Spec 5LD-2009;no peeling and crack are found with both the body and the weld under the flattening test;after intergranular corrosion test, no crack or fracture takes place with the weld; and after the post-overlaying welding corrosion test, no corrosive defect is found with the weld, and furthermore the corrosion rate is low.It is practical to adopt the above mentioned combination process to produce double-metal clad pipe.
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