Corrosion Resistant Bimetallic Pipe Manufactured by HIP and Hot Extrusion (HHE) Process

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概要

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• A new HIP and hot extrusion (HHE) process for manufacturing bimetallic pipes and tubes is proposed. The purpose is to produce bimetallic pipes and tubes the liner and substrate of which consist of those having a large difference in their hot deformation resistances. The most important point is to join the two metals metallurgically, by hot isostatic pressing, before hot working such as hot extrusion. After the feasibility of the process had been verified by the preliminary study at a laboratory scale, a trial production was conducted for a full scale corrosion resistant pipe for oil country tubular goods (OCTG) for sour service. The inner and outer materials of the pipe were a nickel-base superalloy and SSC resistant low alloy high strength steel, respectively. A bimetallic pipe with uniform thickness of both outer and inner metals was obtained by the new process. The corrosion resistance of the two layers of metals as well as the strength of the outer material exhibited satisfactory performance to comply with the requirements for OCTG use. The proposed process, HIP and hot extrusion process, is promising for producing bimetallic materials with excellent corrosion resistance and with metallurgical bonding between two materials that have much different hot workabilities.

著者

• Miyasaka Akihiro

  Pipe and Tube Research Laboratory, Nippon Steel Corporation

• Kitaguchi Saburoh

  Joining Technology Laboratory, Nippon Steel Corporation

• Araki Satoshi

  Hikari Division Laboratory, Nippon Steel Corporation

• Noguchi Takeo

  Hikari Works, Nippon Steel Corporation

関連論文

• Corrosion Resistant Bimetallic Pipe Manufactured by HIP and Hot Extrusion (HHE) Process
• Prediction of Critical Environments for Active-Passive Transition of Corrosion Resistant Alloys in Sour Environments
• Estimation and measurements of pH in high temperature and high pressure sour environments.

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