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Effect of Applied Stress and Precracking Parameters on KISSC of High Strength Steel Grades

The NACE Standard DCB test Method D provides a measure of resistance to crack propagation in sour environment; expressed in terms of a critical intensity factor for Sulfide Stress Cracking. Testing conditions must be such to ensure crack initiation since is a crack arrest type of fracture mechanics test. To ensure crack initiation the formation of a sharp crack tip by fatigue precracking is permitted by the mentioned standard; however the conditions in which precracking procedure must be performed are not so well established and were modified over the years. Definition of pre-cracking load is crucial for obtaining the true value of since excessive load will produce an increment of the plastic zone at the crack tip that will delay crack initiation generating overestimation of that could not be otherwise noticeable. Despite the selection of pre-cracking load and procedure has a clear impact on Method D result criterion of NACE TM0177 has changed over the yearsand nowadays differs in the maximum precracking intensity factor defined for C110 in API 5CT. The main objective of this work is to quantify the effect of pre-cracking load on sour resistance for the High Strength Steel grades tested with different arm displacement. Tests were performed NACE A solution and SR39.3 solution for C110 and in NACE A for the future C125 grade at 24°C.

Product Number: 51319-13183-SG
Author: María José Cancio
Publication Date: 2019
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