Influence of microstructure on mechanical properties and corrosion behavior of 3%Cr steel in CO2 environment |
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| Authors: | L N Xu S Q Guo C L Gao W Chang T H Chen M X Lu |
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| Affiliation: | 1. Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083 (P. R. China);2. Oil Recovery Engineering Institute of Daqing Oilfield Ltd, Daqing 163453 (P. R. China);3. CNOOC Research Institute, Beijing 100027 (P. R. China) |
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| Abstract: | Corrosion behavior and mechanical properties of two 3%Cr pipeline steels were studied which have same chemical compositions but different microstructures, bainite‐ferrite and ferrite‐pearlite microstructures. Analysis of chemical compositions and surface morphology of the corrosion scale were performed using X‐ray diffraction and scanning electron microscopy in conjunction with energy dispersive X‐ray spectroscopy. The semi‐passive character of corrosion scale was investigated using polarization curves measurements. The influence of microstructure on the chromium enrichment in the corrosion scale for different test periods was investigated. The microstructure was observed to affect the corrosion behavior even when the steel surface has been covered with corrosion scales and continue to have an effect until the corrosion scale possessing semi‐passive character. Possessing both good strength and corrosion resistance, 3%Cr steel with bainite‐ferrite microstructure was very promising for pipeline steel applications. |
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| Keywords: | chromium bearing steel CO2 corrosion corrosion behavior mechanical property microstructure |
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