The susceptibility of High Strength Low Alloy steels to Sulfide Stress Cracking (SSC) in H2S containing environments is evaluated by NACE TM0177-2005 test methods. Those SSC tests are commonly conducted at room temperature and atmospheric pressure. However, because of the severity of some O&G wells, there is a need for assessing the SSC susceptibility at higher partial pressures of H2S. The evolution of the SSC resistance of Sour Service grades (T95 and C110) with the H2S partial pressure has been investigated according to the uniaxial tensile (Method A) and double cantilever beam (Method D) corrosion tests in autoclaves. Up to 0.6 or 1 MPa, no detrimental effect of the increase of the H2S gas pressure has been observed on the failure susceptibility with the NACE uniaxial tensile test. However, a significant decrease of KISSC values occurred. DCB tests conducted in the temperature range 21°C to 27°C indicate that the bath temperatu re, in addition to the H2S pressure, is another controlling parameter for KISSC.

Subject
Double layer, Hydrogen sulfide, Test methods, Materials, Hydrogen concentration, Corrosion rate, Iron sulfides, Autoclaves, Gas pressure, Partial pressures, Steel, Sulfide stress cracking, Hydrogen
Keywords:
Sour Service, DCB, High H2S Partial Pressure, Autoclave Loading Procedure
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2012
Association for Materials Protection and Performance (AMPP)
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