Effect of Cold Deformation on the Microstructures, Mechanical Properties and Corrosion Behavior of IF Steel in Simulated H2S Solutions
Expandable tubular technology is a new technology in oil industry. Interstitial-free (IF) steel has potential application as expandable tubular steel because of its excellent non-aging property and extra-deep drawing quality. In this study, the effects of cold deformation on the microstructures, mechanical properties, and corrosion behavior of IF steel in simulated H2S solutions were investigated. Results showed that when the cold reduction rate was up to 60%, the grains tended to form a fibrous tissue. Hardness, yield strength, and tensile strength of IF steel increased with increasing cold reduction rates, whereas elongation decreased. Although the cold reduction rate increased up to 80%, the remaining elongation was beyond 10%, which was suitable for the expandable tubular application. With increasing cold reduction rate, the corrosion rate increased, and the “hardening” effect expanded.
KeywordsExpandable tubular technology Interstitial-free steel Cold deformation Microstructures Mechanical properties Simulates H2S corrosion
This work was financially supported by the Extracurricular Opening Experiment Project of SWPU (KSZ16098), the General Project of Educational Commission of Sichuan Province (14ZB0055) and the Natural Science Foundation of SWPU (2013XJZ018).
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