Sulfide stress cracking (SSC) has been a concern for the use of high strength low alloy (HSLA) steel in oil and gas industry. A novel methodology named notch tensile slow strain rate test (NTSSRT) is used to obtain the threshold stress intensity factor KISSC to quantify SSC resistance of HSLA carbon steel. In this study we evaluate the effect of the strain rate and specimen gage diameter, on KISSC assessed by NTSSRT method. The testing is performed in environment with different H2S concentrations at pH of 3.5. At the same H2S concentration, the KISSC value decreases with a decline in strain rate due to the longer immersion time at slower strain rate. For 40%-notched specimen (notch diameter/gage diameter = 0.6), KISSC is independent on the specimen gage diameter when the gage diameter is larger than 0.125 in.

Subject
Test methods, Strain rate, Hydrogen embrittlement, Materials, Hydrogen concentration, Notches, Fracture surfaces, Stress strain curves, Surface morphology, Stress cracking, Steel, Carbon steel, Sulfide stress cracking
Keywords:
H2S, KISSC, SSC, strain rate, specimen geometry
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2022
Association for Materials Protection and Performance (AMPP)
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