Abstract
The sulfide stress cracking (SSC) of the API-5CT-C110 grade casing steel in this work was evaluated by double cantilever beam (DCB) testing, two thermal treatments were used to investigate microstructures and properties. Compared to one, long-term tempering treatment, the study showed that precipitate size and dislocation density significantly decreased if two, short-term tempering treatments were used instead. DCB testing showed that SSC resistance is improved by double tempering with no degradation of strength. Specimens treated by double tempering have a lower proportion of Σ3 boundary, high-angle grain boundaries and high Taylor factor values, reduced susceptibility to crack initiation and propagation.
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