Nanostructured steel susceptibility to sulfide stress corrosion cracking
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© 2018 by NACE International. The susceptibility of a high strength low alloy nanostructured steel to sulfide stress corrosion cracking (SSCC) resistance is assessed. Notch Tensile Slow Strain Rate Testing (NTSSRT) method is used to evaluate the threshold stress intensity values (KISSCC). The objective of this study is to understand the effect of the microstructure and chemical composition on the susceptibility to SSC; the control condition is a conventional low alloy carbon steel with a tempered martensitic microstructure. The tests were performed in a brine with 1% NaCl buffered at pH 4.5 with H2S gas with 1% to 100% (mol %) balance N2 at room conditions. The results of the KISSC testing indicates that the nano-structured steel exhibits a value of 46 MPa m0.5 at 100% (mol%) H2S at room conditions. The same tests performed on API C110 grade steel shows 20 MPa m0.5. The evaluation of the relative crack propagation energy suggest that the nano-structured steel exhibits a much lower susceptibility to SSC than the tempered martensitic microstructure.
author list (cited authors)
Case, R., Shadravan, A., & Rumann, A.