The influence of residual stresses and microstructure on the sour gas resistivity of seamless high strength low-alloyed streel tubes is investigated. Residual stresses can be induced during the manufacturing process and range from macroscopic stresses – so-called first order residual stresses – to higher order residual stresses on a micro- and atomic scale and strongly depend on the microstructure and its evolution. In-service, the residual stresses may be superimposed with additional mechanical loading and the material may additionally be exposed to corrosive media, such as sour gas (H2S). To investigate the influence of the microstructure as well as internal and external stresses on the sour gas resistivity, specimens with different heat treatment conditions are tested under sour gas conditions with and without additional mechanical loading. Different X-ray diffraction measurements in combination with microstructure characterization are used to access the influence of different microstructures and exposure times on the stress state. This allows correlations between the microstructure, stress state and sour gas resistivity.
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