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The Influence Of Applied Extension Rate And Specimen Geometry On Assessment Of SSC Resistance By Novel NTSSRT Method

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High strength low alloy (HSLA) steels are preferred for oil and gas pipelines due to their outstanding mechanical properties. Sulfide stress cracking (SSC) has been a major problem for the application of HSLA carbon steel because of the wet H2S environment which commonly presents in oil and gas industry. Several techniques are applied to the study of SSC of steels, including constant load test with smooth specimens and DCB testing.

Product Number: 51322-17624-SG
Author: Lianlian Liu, Raymundo Case
Publication Date: 2022
Industries: Corrosion Monitoring and Control , Coatings and Linings , Coatings
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$20.00

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.

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.

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