Abstract
High interstitial Fe–Cr–Mn–C–N stainless steels, CN66 (0.38 wt% N + 0.28 wt% C) and CN71 (0.44 wt% N + 0.27 wt% C), were cast under atmospheric pressure to develop a new drill collar for use in petroleum industry. To evaluate the corrosion property, CN66 and CN71 were compared with high-Mn stainless steel, P550, which is currently being used as a drill collar material. Through the measurement of the corrosion resistance based on the chemical compositions, CN71 exhibited the highest corrosion property, a mean of 35.74, corresponding to strong corrosion resistance. However, CN71 exhibited a mean of 0.517 mpy for the corrosion rate compared to 0.37 mpy for P550, after the immersion experiment in 3.5 wt% NaCl. With high C content, the formation of carbide along the grain boundaries in CN71 and CN66 caused intergranular corrosion. However, this could be restricted by heat treatment at 1050 °C and 1180 °C with uniform distributions of chemical compositions via air cooling, decreasing the corrosion rates significantly.
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Acknowledgements
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean government (NRF-2014M3C1A9060717 and NRF-2019R1I1A3A01062863), and the Basic Research Project (GP2017-025) of the Korea Institute of Geoscience and Mineral Resources (KIGAM) funded by the Ministry of Science, ICT and Future Planning of Korea, and the Korea Maritime and Ocean University Research Fund.
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Ahn, C., Lee, H., Lee, Y. et al. Development of High Interstitial Stainless Steel and Evaluation of Its NaCl Corrosion Resistance. Met. Mater. Int. 26, 1710–1714 (2020). https://doi.org/10.1007/s12540-019-00505-x
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DOI: https://doi.org/10.1007/s12540-019-00505-x