Nanostructured steel susceptibility to sulfide stress corrosion cracking
Conference Paper
Overview
Overview
abstract
2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. All rights reserved. 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 SSCC; the control condition is a conventional low alloy carbon steel with a tempered martensite 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 nanostructured steel results in the KISSCC parameter are: 107 Ksi in0.5 at 1% H2S to 42 Ksi in0.5 at 100% H2S. The control condition exhibited 22 Ksi in0.5 at 100% H2S. The evaluation of the relative crack propagation energy suggest that the nanostructured ferrite grains exhibit a much lower susceptibility to SSCC than the tempered martensitic microstructure.
