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51317--9610-Effect of Cold Deformation on Sulfide Stress Cracking of High Strength Steels

A quantitative assessment of remnant cold deformation and effectiveness of post deformation treatment (PDT) on sour resistance and mechanical properties of a C110 grade by reproducing uniform deformation with tensile/compressive tests followed by heating/soaking/cooling cycles representing induction PDT

 

Product Number: 51317--9610-SG
ISBN: 9610 2017 CP
Author: María José Cancio
Publication Date: 2017
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During pipe-ends dimensional modification prior to connections threading operation (pin swaging and box expansion) the material suffers from a cold deformation process. Hence the deformation process is followed by a post deformation heat treatment (PDHT) with the objective of recovering the material properties to its original condition (pipe body). If not correctly understood designed and performed this process could have both mechanical and metallurgical effect on the pipe-end material and hence affecting the pipe performance in service. Therefore it is not only a primary concern from the OCTG manufacturers but also from Oil and Gas users. The evaluation of such process in actual connections is limited due to geometrical constrains and the interpretation results is difficult due to the scatter introduced by the properties gradient along the pipe end. This work intends to evaluate the effect of controlled uniform deformation and subsequent PDHT in samples that represents specific material point in the swaging areas providing a clear understanding over the effect of the cold deformation and subsequent PDHT on mechanical properties and sour resistance (measured by NACE Method D-KISSC) in T95 and C110 grades.

Key words: C110, swaging, deformation, post deformation treatment, sour resistance, Method D, low alloy steel, KISSC

During pipe-ends dimensional modification prior to connections threading operation (pin swaging and box expansion) the material suffers from a cold deformation process. Hence the deformation process is followed by a post deformation heat treatment (PDHT) with the objective of recovering the material properties to its original condition (pipe body). If not correctly understood designed and performed this process could have both mechanical and metallurgical effect on the pipe-end material and hence affecting the pipe performance in service. Therefore it is not only a primary concern from the OCTG manufacturers but also from Oil and Gas users. The evaluation of such process in actual connections is limited due to geometrical constrains and the interpretation results is difficult due to the scatter introduced by the properties gradient along the pipe end. This work intends to evaluate the effect of controlled uniform deformation and subsequent PDHT in samples that represents specific material point in the swaging areas providing a clear understanding over the effect of the cold deformation and subsequent PDHT on mechanical properties and sour resistance (measured by NACE Method D-KISSC) in T95 and C110 grades.

Key words: C110, swaging, deformation, post deformation treatment, sour resistance, Method D, low alloy steel, KISSC

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