A Novel Model to Assess Sulfide Stress Cracking (SSC) Susceptibility of Carbon Steels

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Product Number: 51321-16326-SG

Author: Yuan Ding/Raymundo Case

Publication Date: 2021

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NACE TM0177 method D1has long been the standard method for estimating SSC susceptibility of carbonsteels by directly measuring KISCC. However, the lengthy experimental duration made the generated results unreliable especially in the low H2S concentration environments. Therefore, a novel approach based on J-integrals obtained from the notched tensile slow strain rate test (NTRRST) is established to provide a universal solution for SSC susceptibility evaluation. In the current research, the KISSCvalues of twodifferent materials in air, C110 and P110, were evaluated using the new approach and compared to available data from the literature using NACE TM0177 method D1. The effect of the notch ratio was investigated using finite element analysis (FEA) to verify the J integrals calculated using the proposed calculation method. The simulated tensile behavior was compared to the experiments performed in air and used to assess the optimal notch size. The experiments performed under H2S containing environments were used to develop a calculation method for KISSCbased on analytical solutions for the fracture energy on notched tensile specimens.Good agreement was observed between the NACE D tests and the NTSSRT results at conditions were a sour environment existedaccording to the NACE MR0175/ISO 15156definition2.In addition, NTSSRT experiments of those materials under different H2S concentrations and pH were compared. The results provide further analysis of the successful evaluation of KISSC.

Key words: SCC susceptibility, KISCC, Abaqus, Carbon steels, J integrals.