The effects of cold working and stress relieving sour service grades of tubulars on mechanical properties and SSC resistance were investigated. Several sizes and pipe grades of sour service OCTG were cold expanded and stress relieved under varying conditions. The cold forming operation, without the benefit of stress relieving, results in lowered yield strengths and resistance to SSC. It was demonstrated that cold formed ends that were induction stress relieved at a minimum of 1100°F exhibited properties that were in the same range as the original unformed pipe body. This return to the original pipe body threshold stress was shown to be true in the transverse direction as well as the longitudinal direction. The higher strength sour service grades were found to exhibit a greater degree of SSC resistance as measured by the absolute value of the threshold stress when compared with lower strength level sour service grades.

Subject
Test methods, Materials, Piping, Yield stress, Mechanical properties, Stress, Sulfide stress, Mechanical failure, Steel, Cold working, Sulfide stress cracking, Hardness, Yield strength
Keywords:
bauschinger effect, cold working, connections, OCTG, stress relieving, sulfide stress cracking, tubulars
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1995
Association for Materials Protection and Performance (AMPP)
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