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51318-10821-Technical evaluation of cold end-sizing and stress-relieving mill operations while preserving the SSC resistance of sour service OCTG pipes

How tensile properties behave after thermal stress-relieving with regards to the cold-forming history of the material and how this correlates to the SSC resistance of pipe-ends sampled.

Product Number: 51318-10821-SG
Author: John Fortaillier / Julien Millet / Florian Thébault
Publication Date: 2018
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The manufacturing of integral connections in OCTG includes cold end-sizing operations that may impact the SSC resistance of the cold-formed ends of high strength sour service pipes. The common process to recover this SSC resistance is thermal stress-relieving, but the latter raises concerns and is subjected to heterogeneous requirements from standards and from end-users.

This article discloses how the tensile properties behave after thermal stress-relieving with regards to the cold-forming history of the material (crimping vs. expanding of the outside diameter) and how this behavior correlates to the SSC resistance of pipe-ends sampled after industrial operations of end-sizing followed by induction stress-relieving operation.

Key words: stress-relieving, end-sizing, crimping, expanding, tensile, yield strength, sulfide stress cracking

The manufacturing of integral connections in OCTG includes cold end-sizing operations that may impact the SSC resistance of the cold-formed ends of high strength sour service pipes. The common process to recover this SSC resistance is thermal stress-relieving, but the latter raises concerns and is subjected to heterogeneous requirements from standards and from end-users.

This article discloses how the tensile properties behave after thermal stress-relieving with regards to the cold-forming history of the material (crimping vs. expanding of the outside diameter) and how this behavior correlates to the SSC resistance of pipe-ends sampled after industrial operations of end-sizing followed by induction stress-relieving operation.

Key words: stress-relieving, end-sizing, crimping, expanding, tensile, yield strength, sulfide stress cracking

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